/* Machine independent support for SVR4 /proc (process file system) for GDB.
- Copyright 1991, 1992 Free Software Foundation, Inc.
+ Copyright 1991, 1992, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
Written by Fred Fish at Cygnus Support.
This file is part of GDB.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* N O T E S
#include "defs.h"
+#include <sys/types.h>
#include <time.h>
+#include <sys/fault.h>
+#include <sys/syscall.h>
#include <sys/procfs.h>
#include <fcntl.h>
#include <errno.h>
-#include <string.h>
+#include "gdb_string.h"
+#include <stropts.h>
+#include <poll.h>
+#include <unistd.h>
+#include "gdb_stat.h"
#include "inferior.h"
#include "target.h"
#include "command.h"
#include "gdbcore.h"
+#include "gdbthread.h"
#define MAX_SYSCALLS 256 /* Maximum number of syscalls for table */
extern struct target_ops procfs_ops; /* Forward declaration */
+int procfs_suppress_run = 0; /* Non-zero if procfs should pretend not to
+ be a runnable target. Used by targets
+ that can sit atop procfs, such as solaris
+ thread support. */
+
#if 1 /* FIXME: Gross and ugly hack to resolve coredep.c global */
CORE_ADDR kernel_u_addr;
#endif
the inferior's procinfo information. */
struct procinfo {
- int valid; /* Nonzero if pid, fd, & pathname are valid */
+ struct procinfo *next;
int pid; /* Process ID of inferior */
int fd; /* File descriptor for /proc entry */
char *pathname; /* Pathname to /proc entry */
+ int had_event; /* poll/select says something happened */
int was_stopped; /* Nonzero if was stopped prior to attach */
int nopass_next_sigstop; /* Don't pass a sigstop on next resume */
prrun_t prrun; /* Control state when it is run */
sigset_t saved_sighold; /* Saved held signal set */
sysset_t saved_exitset; /* Saved traced system call exit set */
sysset_t saved_entryset; /* Saved traced system call entry set */
+ int num_syscall_handlers; /* Number of syscall handlers currently installed */
+ struct procfs_syscall_handler *syscall_handlers; /* Pointer to list of syscall trap handlers */
+ int new_child; /* Non-zero if it's a new thread */
};
-static struct procinfo pi; /* Inferior's process information */
+/* List of inferior process information */
+static struct procinfo *procinfo_list = NULL;
+
+static struct pollfd *poll_list; /* pollfds used for waiting on /proc */
+
+static int num_poll_list = 0; /* Number of entries in poll_list */
/* Much of the information used in the /proc interface, particularly for
printing status information, is kept as tables of structures of the
static struct trans pr_flag_table[] =
{
#if defined (PR_STOPPED)
- PR_STOPPED, "PR_STOPPED", "Process is stopped",
+ { PR_STOPPED, "PR_STOPPED", "Process is stopped" },
#endif
#if defined (PR_ISTOP)
- PR_ISTOP, "PR_ISTOP", "Stopped on an event of interest",
+ { PR_ISTOP, "PR_ISTOP", "Stopped on an event of interest" },
#endif
#if defined (PR_DSTOP)
- PR_DSTOP, "PR_DSTOP", "A stop directive is in effect",
+ { PR_DSTOP, "PR_DSTOP", "A stop directive is in effect" },
#endif
#if defined (PR_ASLEEP)
- PR_ASLEEP, "PR_ASLEEP", "Sleeping in an interruptible system call",
+ { PR_ASLEEP, "PR_ASLEEP", "Sleeping in an interruptible system call" },
#endif
#if defined (PR_FORK)
- PR_FORK, "PR_FORK", "Inherit-on-fork is in effect",
+ { PR_FORK, "PR_FORK", "Inherit-on-fork is in effect" },
#endif
#if defined (PR_RLC)
- PR_RLC, "PR_RLC", "Run-on-last-close is in effect",
+ { PR_RLC, "PR_RLC", "Run-on-last-close is in effect" },
#endif
#if defined (PR_PTRACE)
- PR_PTRACE, "PR_PTRACE", "Process is being controlled by ptrace",
+ { PR_PTRACE, "PR_PTRACE", "Process is being controlled by ptrace" },
#endif
#if defined (PR_PCINVAL)
- PR_PCINVAL, "PR_PCINVAL", "PC refers to an invalid virtual address",
+ { PR_PCINVAL, "PR_PCINVAL", "PC refers to an invalid virtual address" },
#endif
#if defined (PR_ISSYS)
- PR_ISSYS, "PR_ISSYS", "Is a system process",
+ { PR_ISSYS, "PR_ISSYS", "Is a system process" },
#endif
#if defined (PR_STEP)
- PR_STEP, "PR_STEP", "Process has single step pending",
+ { PR_STEP, "PR_STEP", "Process has single step pending" },
#endif
#if defined (PR_KLC)
- PR_KLC, "PR_KLC", "Kill-on-last-close is in effect",
+ { PR_KLC, "PR_KLC", "Kill-on-last-close is in effect" },
#endif
#if defined (PR_ASYNC)
- PR_ASYNC, "PR_ASYNC", "Asynchronous stop is in effect",
+ { PR_ASYNC, "PR_ASYNC", "Asynchronous stop is in effect" },
#endif
#if defined (PR_PCOMPAT)
- PR_PCOMPAT, "PR_PCOMPAT", "Ptrace compatibility mode in effect",
+ { PR_PCOMPAT, "PR_PCOMPAT", "Ptrace compatibility mode in effect" },
#endif
- 0, NULL, NULL
+ { 0, NULL, NULL }
};
/* Translate values in the pr_why field of the prstatus struct. */
static struct trans pr_why_table[] =
{
#if defined (PR_REQUESTED)
- PR_REQUESTED, "PR_REQUESTED", "Directed to stop via PIOCSTOP/PIOCWSTOP",
+ { PR_REQUESTED, "PR_REQUESTED", "Directed to stop via PIOCSTOP/PIOCWSTOP" },
#endif
#if defined (PR_SIGNALLED)
- PR_SIGNALLED, "PR_SIGNALLED", "Receipt of a traced signal",
+ { PR_SIGNALLED, "PR_SIGNALLED", "Receipt of a traced signal" },
#endif
#if defined (PR_FAULTED)
- PR_FAULTED, "PR_FAULTED", "Incurred a traced hardware fault",
+ { PR_FAULTED, "PR_FAULTED", "Incurred a traced hardware fault" },
#endif
#if defined (PR_SYSENTRY)
- PR_SYSENTRY, "PR_SYSENTRY", "Entry to a traced system call",
+ { PR_SYSENTRY, "PR_SYSENTRY", "Entry to a traced system call" },
#endif
#if defined (PR_SYSEXIT)
- PR_SYSEXIT, "PR_SYSEXIT", "Exit from a traced system call",
+ { PR_SYSEXIT, "PR_SYSEXIT", "Exit from a traced system call" },
#endif
#if defined (PR_JOBCONTROL)
- PR_JOBCONTROL, "PR_JOBCONTROL", "Default job control stop signal action",
+ { PR_JOBCONTROL, "PR_JOBCONTROL", "Default job control stop signal action" },
#endif
#if defined (PR_SUSPENDED)
- PR_SUSPENDED, "PR_SUSPENDED", "Process suspended",
+ { PR_SUSPENDED, "PR_SUSPENDED", "Process suspended" },
#endif
- 0, NULL, NULL
+ { 0, NULL, NULL }
};
/* Hardware fault translation table. */
static struct trans faults_table[] =
{
#if defined (FLTILL)
- FLTILL, "FLTILL", "Illegal instruction",
+ { FLTILL, "FLTILL", "Illegal instruction" },
#endif
#if defined (FLTPRIV)
- FLTPRIV, "FLTPRIV", "Privileged instruction",
+ { FLTPRIV, "FLTPRIV", "Privileged instruction" },
#endif
#if defined (FLTBPT)
- FLTBPT, "FLTBPT", "Breakpoint trap",
+ { FLTBPT, "FLTBPT", "Breakpoint trap" },
#endif
#if defined (FLTTRACE)
- FLTTRACE, "FLTTRACE", "Trace trap",
+ { FLTTRACE, "FLTTRACE", "Trace trap" },
#endif
#if defined (FLTACCESS)
- FLTACCESS, "FLTACCESS", "Memory access fault",
+ { FLTACCESS, "FLTACCESS", "Memory access fault" },
#endif
#if defined (FLTBOUNDS)
- FLTBOUNDS, "FLTBOUNDS", "Memory bounds violation",
+ { FLTBOUNDS, "FLTBOUNDS", "Memory bounds violation" },
#endif
#if defined (FLTIOVF)
- FLTIOVF, "FLTIOVF", "Integer overflow",
+ { FLTIOVF, "FLTIOVF", "Integer overflow" },
#endif
#if defined (FLTIZDIV)
- FLTIZDIV, "FLTIZDIV", "Integer zero divide",
+ { FLTIZDIV, "FLTIZDIV", "Integer zero divide" },
#endif
#if defined (FLTFPE)
- FLTFPE, "FLTFPE", "Floating-point exception",
+ { FLTFPE, "FLTFPE", "Floating-point exception" },
#endif
#if defined (FLTSTACK)
- FLTSTACK, "FLTSTACK", "Unrecoverable stack fault",
+ { FLTSTACK, "FLTSTACK", "Unrecoverable stack fault" },
#endif
#if defined (FLTPAGE)
- FLTPAGE, "FLTPAGE", "Recoverable page fault",
+ { FLTPAGE, "FLTPAGE", "Recoverable page fault" },
#endif
- 0, NULL, NULL
+ { 0, NULL, NULL }
};
/* Translation table for signal generation information. See UNIX System
char *desc;
} siginfo_table[] = {
#if defined (SIGILL) && defined (ILL_ILLOPC)
- SIGILL, ILL_ILLOPC, "ILL_ILLOPC", "Illegal opcode",
+ { SIGILL, ILL_ILLOPC, "ILL_ILLOPC", "Illegal opcode" },
#endif
#if defined (SIGILL) && defined (ILL_ILLOPN)
- SIGILL, ILL_ILLOPN, "ILL_ILLOPN", "Illegal operand",
+ { SIGILL, ILL_ILLOPN, "ILL_ILLOPN", "Illegal operand", },
#endif
#if defined (SIGILL) && defined (ILL_ILLADR)
- SIGILL, ILL_ILLADR, "ILL_ILLADR", "Illegal addressing mode",
+ { SIGILL, ILL_ILLADR, "ILL_ILLADR", "Illegal addressing mode" },
#endif
#if defined (SIGILL) && defined (ILL_ILLTRP)
- SIGILL, ILL_ILLTRP, "ILL_ILLTRP", "Illegal trap",
+ { SIGILL, ILL_ILLTRP, "ILL_ILLTRP", "Illegal trap" },
#endif
#if defined (SIGILL) && defined (ILL_PRVOPC)
- SIGILL, ILL_PRVOPC, "ILL_PRVOPC", "Privileged opcode",
+ { SIGILL, ILL_PRVOPC, "ILL_PRVOPC", "Privileged opcode" },
#endif
#if defined (SIGILL) && defined (ILL_PRVREG)
- SIGILL, ILL_PRVREG, "ILL_PRVREG", "Privileged register",
+ { SIGILL, ILL_PRVREG, "ILL_PRVREG", "Privileged register" },
#endif
#if defined (SIGILL) && defined (ILL_COPROC)
- SIGILL, ILL_COPROC, "ILL_COPROC", "Coprocessor error",
+ { SIGILL, ILL_COPROC, "ILL_COPROC", "Coprocessor error" },
#endif
#if defined (SIGILL) && defined (ILL_BADSTK)
- SIGILL, ILL_BADSTK, "ILL_BADSTK", "Internal stack error",
+ { SIGILL, ILL_BADSTK, "ILL_BADSTK", "Internal stack error" },
#endif
#if defined (SIGFPE) && defined (FPE_INTDIV)
- SIGFPE, FPE_INTDIV, "FPE_INTDIV", "Integer divide by zero",
+ { SIGFPE, FPE_INTDIV, "FPE_INTDIV", "Integer divide by zero" },
#endif
#if defined (SIGFPE) && defined (FPE_INTOVF)
- SIGFPE, FPE_INTOVF, "FPE_INTOVF", "Integer overflow",
+ { SIGFPE, FPE_INTOVF, "FPE_INTOVF", "Integer overflow" },
#endif
#if defined (SIGFPE) && defined (FPE_FLTDIV)
- SIGFPE, FPE_FLTDIV, "FPE_FLTDIV", "Floating point divide by zero",
+ { SIGFPE, FPE_FLTDIV, "FPE_FLTDIV", "Floating point divide by zero" },
#endif
#if defined (SIGFPE) && defined (FPE_FLTOVF)
- SIGFPE, FPE_FLTOVF, "FPE_FLTOVF", "Floating point overflow",
+ { SIGFPE, FPE_FLTOVF, "FPE_FLTOVF", "Floating point overflow" },
#endif
#if defined (SIGFPE) && defined (FPE_FLTUND)
- SIGFPE, FPE_FLTUND, "FPE_FLTUND", "Floating point underflow",
+ { SIGFPE, FPE_FLTUND, "FPE_FLTUND", "Floating point underflow" },
#endif
#if defined (SIGFPE) && defined (FPE_FLTRES)
- SIGFPE, FPE_FLTRES, "FPE_FLTRES", "Floating point inexact result",
+ { SIGFPE, FPE_FLTRES, "FPE_FLTRES", "Floating point inexact result" },
#endif
#if defined (SIGFPE) && defined (FPE_FLTINV)
- SIGFPE, FPE_FLTINV, "FPE_FLTINV", "Invalid floating point operation",
+ { SIGFPE, FPE_FLTINV, "FPE_FLTINV", "Invalid floating point operation" },
#endif
#if defined (SIGFPE) && defined (FPE_FLTSUB)
- SIGFPE, FPE_FLTSUB, "FPE_FLTSUB", "Subscript out of range",
+ { SIGFPE, FPE_FLTSUB, "FPE_FLTSUB", "Subscript out of range" },
#endif
#if defined (SIGSEGV) && defined (SEGV_MAPERR)
- SIGSEGV, SEGV_MAPERR, "SEGV_MAPERR", "Address not mapped to object",
+ { SIGSEGV, SEGV_MAPERR, "SEGV_MAPERR", "Address not mapped to object" },
#endif
#if defined (SIGSEGV) && defined (SEGV_ACCERR)
- SIGSEGV, SEGV_ACCERR, "SEGV_ACCERR", "Invalid permissions for object",
+ { SIGSEGV, SEGV_ACCERR, "SEGV_ACCERR", "Invalid permissions for object" },
#endif
#if defined (SIGBUS) && defined (BUS_ADRALN)
- SIGBUS, BUS_ADRALN, "BUS_ADRALN", "Invalid address alignment",
+ { SIGBUS, BUS_ADRALN, "BUS_ADRALN", "Invalid address alignment" },
#endif
#if defined (SIGBUS) && defined (BUS_ADRERR)
- SIGBUS, BUS_ADRERR, "BUS_ADRERR", "Non-existent physical address",
+ { SIGBUS, BUS_ADRERR, "BUS_ADRERR", "Non-existent physical address" },
#endif
#if defined (SIGBUS) && defined (BUS_OBJERR)
- SIGBUS, BUS_OBJERR, "BUS_OBJERR", "Object specific hardware error",
+ { SIGBUS, BUS_OBJERR, "BUS_OBJERR", "Object specific hardware error" },
#endif
#if defined (SIGTRAP) && defined (TRAP_BRKPT)
- SIGTRAP, TRAP_BRKPT, "TRAP_BRKPT", "Process breakpoint",
+ { SIGTRAP, TRAP_BRKPT, "TRAP_BRKPT", "Process breakpoint" },
#endif
#if defined (SIGTRAP) && defined (TRAP_TRACE)
- SIGTRAP, TRAP_TRACE, "TRAP_TRACE", "Process trace trap",
+ { SIGTRAP, TRAP_TRACE, "TRAP_TRACE", "Process trace trap" },
#endif
#if defined (SIGCLD) && defined (CLD_EXITED)
- SIGCLD, CLD_EXITED, "CLD_EXITED", "Child has exited",
+ { SIGCLD, CLD_EXITED, "CLD_EXITED", "Child has exited" },
#endif
#if defined (SIGCLD) && defined (CLD_KILLED)
- SIGCLD, CLD_KILLED, "CLD_KILLED", "Child was killed",
+ { SIGCLD, CLD_KILLED, "CLD_KILLED", "Child was killed" },
#endif
#if defined (SIGCLD) && defined (CLD_DUMPED)
- SIGCLD, CLD_DUMPED, "CLD_DUMPED", "Child has terminated abnormally",
+ { SIGCLD, CLD_DUMPED, "CLD_DUMPED", "Child has terminated abnormally" },
#endif
#if defined (SIGCLD) && defined (CLD_TRAPPED)
- SIGCLD, CLD_TRAPPED, "CLD_TRAPPED", "Traced child has trapped",
+ { SIGCLD, CLD_TRAPPED, "CLD_TRAPPED", "Traced child has trapped" },
#endif
#if defined (SIGCLD) && defined (CLD_STOPPED)
- SIGCLD, CLD_STOPPED, "CLD_STOPPED", "Child has stopped",
+ { SIGCLD, CLD_STOPPED, "CLD_STOPPED", "Child has stopped" },
#endif
#if defined (SIGCLD) && defined (CLD_CONTINUED)
- SIGCLD, CLD_CONTINUED, "CLD_CONTINUED", "Stopped child had continued",
+ { SIGCLD, CLD_CONTINUED, "CLD_CONTINUED", "Stopped child had continued" },
#endif
#if defined (SIGPOLL) && defined (POLL_IN)
- SIGPOLL, POLL_IN, "POLL_IN", "Input input available",
+ { SIGPOLL, POLL_IN, "POLL_IN", "Input input available" },
#endif
#if defined (SIGPOLL) && defined (POLL_OUT)
- SIGPOLL, POLL_OUT, "POLL_OUT", "Output buffers available",
+ { SIGPOLL, POLL_OUT, "POLL_OUT", "Output buffers available" },
#endif
#if defined (SIGPOLL) && defined (POLL_MSG)
- SIGPOLL, POLL_MSG, "POLL_MSG", "Input message available",
+ { SIGPOLL, POLL_MSG, "POLL_MSG", "Input message available" },
#endif
#if defined (SIGPOLL) && defined (POLL_ERR)
- SIGPOLL, POLL_ERR, "POLL_ERR", "I/O error",
+ { SIGPOLL, POLL_ERR, "POLL_ERR", "I/O error" },
#endif
#if defined (SIGPOLL) && defined (POLL_PRI)
- SIGPOLL, POLL_PRI, "POLL_PRI", "High priority input available",
+ { SIGPOLL, POLL_PRI, "POLL_PRI", "High priority input available" },
#endif
#if defined (SIGPOLL) && defined (POLL_HUP)
- SIGPOLL, POLL_HUP, "POLL_HUP", "Device disconnected",
+ { SIGPOLL, POLL_HUP, "POLL_HUP", "Device disconnected" },
#endif
- 0, 0, NULL, NULL
+ { 0, 0, NULL, NULL }
};
static char *syscall_table[MAX_SYSCALLS];
/* Prototypes for local functions */
-static void
-set_proc_siginfo PARAMS ((struct procinfo *, int));
+static void procfs_stop PARAMS ((void));
-static void
-init_syscall_table PARAMS ((void));
+static int procfs_thread_alive PARAMS ((int));
-static char *
-syscallname PARAMS ((int));
+static int procfs_can_run PARAMS ((void));
-static char *
-signalname PARAMS ((int));
+static void procfs_mourn_inferior PARAMS ((void));
-static char *
-errnoname PARAMS ((int));
+static void procfs_fetch_registers PARAMS ((int));
-static int
-proc_address_to_fd PARAMS ((CORE_ADDR, int));
+static int procfs_wait PARAMS ((int, struct target_waitstatus *));
-static int
-open_proc_file PARAMS ((int, struct procinfo *, int));
+static void procfs_open PARAMS ((char *, int));
-static void
-close_proc_file PARAMS ((struct procinfo *));
+static void procfs_files_info PARAMS ((struct target_ops *));
-static void
-unconditionally_kill_inferior PARAMS ((void));
+static void procfs_prepare_to_store PARAMS ((void));
-static void
-proc_init_failed PARAMS ((char *));
+static void procfs_detach PARAMS ((char *, int));
-static void
-info_proc PARAMS ((char *, int));
+static void procfs_attach PARAMS ((char *, int));
-static void
-info_proc_flags PARAMS ((struct procinfo *, int));
+static void proc_set_exec_trap PARAMS ((void));
-static void
-info_proc_stop PARAMS ((struct procinfo *, int));
+static int procfs_init_inferior PARAMS ((int));
-static void
-info_proc_siginfo PARAMS ((struct procinfo *, int));
+static struct procinfo *create_procinfo PARAMS ((int));
-static void
-info_proc_syscalls PARAMS ((struct procinfo *, int));
+static void procfs_store_registers PARAMS ((int));
-static void
-info_proc_mappings PARAMS ((struct procinfo *, int));
+static int procfs_xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
-static void
-info_proc_signals PARAMS ((struct procinfo *, int));
+static void procfs_kill_inferior PARAMS ((void));
-static void
-info_proc_faults PARAMS ((struct procinfo *, int));
+static char *sigcodedesc PARAMS ((siginfo_t *));
-static char *
-mappingflags PARAMS ((long));
+static char *sigcodename PARAMS ((siginfo_t *));
-static char *
-lookupname PARAMS ((struct trans *, unsigned int, char *));
+static struct procinfo *wait_fd PARAMS ((void));
-static char *
-lookupdesc PARAMS ((struct trans *, unsigned int));
+static void remove_fd PARAMS ((struct procinfo *));
-static int
-do_attach PARAMS ((int pid));
+static void add_fd PARAMS ((struct procinfo *));
-static void
-do_detach PARAMS ((int siggnal));
+static void set_proc_siginfo PARAMS ((struct procinfo *, int));
-static void
-procfs_create_inferior PARAMS ((char *, char *, char **));
+static void init_syscall_table PARAMS ((void));
-static void
-procfs_notice_signals PARAMS ((void));
+static char *syscallname PARAMS ((int));
+
+static char *signalname PARAMS ((int));
+
+static char *errnoname PARAMS ((int));
+
+static int proc_address_to_fd PARAMS ((struct procinfo *, CORE_ADDR, int));
+
+static int open_proc_file PARAMS ((int, struct procinfo *, int));
+
+static void close_proc_file PARAMS ((struct procinfo *));
+
+static void unconditionally_kill_inferior PARAMS ((struct procinfo *));
+
+static NORETURN void proc_init_failed PARAMS ((struct procinfo *, char *)) ATTR_NORETURN;
+
+static void info_proc PARAMS ((char *, int));
+
+static void info_proc_flags PARAMS ((struct procinfo *, int));
+
+static void info_proc_stop PARAMS ((struct procinfo *, int));
+
+static void info_proc_siginfo PARAMS ((struct procinfo *, int));
+
+static void info_proc_syscalls PARAMS ((struct procinfo *, int));
+
+static void info_proc_mappings PARAMS ((struct procinfo *, int));
+
+static void info_proc_signals PARAMS ((struct procinfo *, int));
+
+static void info_proc_faults PARAMS ((struct procinfo *, int));
+
+static char *mappingflags PARAMS ((long));
+
+static char *lookupname PARAMS ((struct trans *, unsigned int, char *));
+
+static char *lookupdesc PARAMS ((struct trans *, unsigned int));
+
+static int do_attach PARAMS ((int pid));
+
+static void do_detach PARAMS ((int siggnal));
+
+static void procfs_create_inferior PARAMS ((char *, char *, char **));
+
+static void procfs_notice_signals PARAMS ((int pid));
+
+static struct procinfo *find_procinfo PARAMS ((pid_t pid, int okfail));
+
+typedef int syscall_func_t PARAMS ((struct procinfo *pi, int syscall_num,
+ int why, int *rtnval, int *statval));
+
+static void procfs_set_syscall_trap PARAMS ((struct procinfo *pi,
+ int syscall_num, int flags,
+ syscall_func_t *func));
+
+static void procfs_clear_syscall_trap PARAMS ((struct procinfo *pi,
+ int syscall_num, int errok));
+
+#define PROCFS_SYSCALL_ENTRY 0x1 /* Trap on entry to sys call */
+#define PROCFS_SYSCALL_EXIT 0x2 /* Trap on exit from sys call */
+
+static syscall_func_t procfs_exit_handler;
+
+static syscall_func_t procfs_exec_handler;
+
+#ifdef SYS_sproc
+static syscall_func_t procfs_sproc_handler;
+static syscall_func_t procfs_fork_handler;
+#endif
+
+#ifdef SYS_lwp_create
+static syscall_func_t procfs_lwp_creation_handler;
+#endif
+
+static void modify_inherit_on_fork_flag PARAMS ((int fd, int flag));
+static void modify_run_on_last_close_flag PARAMS ((int fd, int flag));
+
+/* */
+
+struct procfs_syscall_handler
+{
+ int syscall_num; /* The number of the system call being handled */
+ /* The function to be called */
+ syscall_func_t *func;
+};
+
+static void procfs_resume PARAMS ((int pid, int step,
+ enum target_signal signo));
/* External function prototypes that can't be easily included in any
header file because the args are typedefs in system include files. */
-extern void
-supply_gregset PARAMS ((gregset_t *));
+extern void supply_gregset PARAMS ((gregset_t *));
+
+extern void fill_gregset PARAMS ((gregset_t *, int));
+
+extern void supply_fpregset PARAMS ((fpregset_t *));
+
+extern void fill_fpregset PARAMS ((fpregset_t *, int));
+
+/*
+
+LOCAL FUNCTION
+
+ find_procinfo -- convert a process id to a struct procinfo
+
+SYNOPSIS
+
+ static struct procinfo * find_procinfo (pid_t pid, int okfail);
+
+DESCRIPTION
+
+ Given a process id, look it up in the procinfo chain. Returns
+ a struct procinfo *. If can't find pid, then call error(),
+ unless okfail is set, in which case, return NULL;
+ */
+
+static struct procinfo *
+find_procinfo (pid, okfail)
+ pid_t pid;
+ int okfail;
+{
+ struct procinfo *procinfo;
+
+ for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
+ if (procinfo->pid == pid)
+ return procinfo;
+
+ if (okfail)
+ return NULL;
+
+ error ("procfs (find_procinfo): Couldn't locate pid %d", pid);
+}
+
+/*
+
+LOCAL MACRO
+
+ current_procinfo -- convert inferior_pid to a struct procinfo
+
+SYNOPSIS
+
+ static struct procinfo * current_procinfo;
+
+DESCRIPTION
+
+ Looks up inferior_pid in the procinfo chain. Always returns a
+ struct procinfo *. If process can't be found, we error() out.
+ */
+
+#define current_procinfo find_procinfo (inferior_pid, 0)
+
+/*
+
+LOCAL FUNCTION
+
+ add_fd -- Add the fd to the poll/select list
+
+SYNOPSIS
+
+ static void add_fd (struct procinfo *);
+
+DESCRIPTION
+
+ Add the fd of the supplied procinfo to the list of fds used for
+ poll/select operations.
+ */
+
+static void
+add_fd (pi)
+ struct procinfo *pi;
+{
+ if (num_poll_list <= 0)
+ poll_list = (struct pollfd *) xmalloc (sizeof (struct pollfd));
+ else
+ poll_list = (struct pollfd *) xrealloc (poll_list,
+ (num_poll_list + 1)
+ * sizeof (struct pollfd));
+ poll_list[num_poll_list].fd = pi->fd;
+ poll_list[num_poll_list].events = POLLPRI;
+
+ num_poll_list++;
+}
+
+static void
+remove_fd (pi)
+ struct procinfo *pi;
+{
+ int i;
+
+ for (i = 0; i < num_poll_list; i++)
+ {
+ if (poll_list[i].fd == pi->fd)
+ {
+ if (i != num_poll_list - 1)
+ memcpy (poll_list + i, poll_list + i + 1,
+ (num_poll_list - i - 1) * sizeof (struct pollfd));
+
+ num_poll_list--;
+
+ if (num_poll_list == 0)
+ free (poll_list);
+ else
+ poll_list = (struct pollfd *) xrealloc (poll_list,
+ num_poll_list
+ * sizeof (struct pollfd));
+ return;
+ }
+ }
+}
+
+static struct procinfo *
+wait_fd ()
+{
+ struct procinfo *pi;
+#ifndef LOSING_POLL
+ int num_fds;
+ int i;
+#endif
+
+ set_sigint_trap (); /* Causes SIGINT to be passed on to the
+ attached process. */
+ set_sigio_trap ();
+
+#ifndef LOSING_POLL
+ num_fds = poll (poll_list, num_poll_list, -1);
+#else
+ pi = current_procinfo;
+
+ while (ioctl (pi->fd, PIOCWSTOP, &pi->prstatus) < 0)
+ {
+ if (errno == ENOENT)
+ {
+ /* Process exited. */
+ pi->prstatus.pr_flags = 0;
+ break;
+ }
+ else if (errno != EINTR)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCWSTOP failed");
+ }
+ }
+ pi->had_event = 1;
+#endif
+
+ clear_sigint_trap ();
+ clear_sigio_trap ();
+
+#ifndef LOSING_POLL
-extern void
-fill_gregset PARAMS ((gregset_t *, int));
+ if (num_fds <= 0)
+ {
+ print_sys_errmsg ("poll failed\n", errno);
+ error ("Poll failed, returned %d", num_fds);
+ }
-extern void
-supply_fpregset PARAMS ((fpregset_t *));
+ for (i = 0; i < num_poll_list && num_fds > 0; i++)
+ {
+ if ((poll_list[i].revents & (POLLPRI|POLLERR|POLLHUP|POLLNVAL)) == 0)
+ continue;
+ for (pi = procinfo_list; pi; pi = pi->next)
+ {
+ if (poll_list[i].fd == pi->fd)
+ {
+ if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCSTATUS failed");
+ }
+ num_fds--;
+ pi->had_event = 1;
+ break;
+ }
+ }
+ if (!pi)
+ error ("wait_fd: Couldn't find procinfo for fd %d\n",
+ poll_list[i].fd);
+ }
+#endif /* LOSING_POLL */
-extern void
-fill_fpregset PARAMS ((fpregset_t *, int));
+ return pi;
+}
/*
int syscallnum;
{
static char locbuf[32];
- char *rtnval;
- if (syscallnum >= 0 && syscallnum < MAX_SYSCALLS)
- {
- rtnval = syscall_table[syscallnum];
- }
+ if (syscallnum >= 0 && syscallnum < MAX_SYSCALLS
+ && syscall_table[syscallnum] != NULL)
+ return syscall_table[syscallnum];
else
{
sprintf (locbuf, "syscall %u", syscallnum);
- rtnval = locbuf;
+ return locbuf;
}
- return (rtnval);
}
/*
#if defined (SYS_seteuid)
syscall_table[SYS_seteuid] = "seteuid";
#endif
-}
-
-/*
-
-GLOBAL FUNCTION
-
- ptrace -- override library version to force errors for /proc version
-
-SYNOPSIS
-
- int ptrace (int request, int pid, PTRACE_ARG3_TYPE arg3, int arg4)
-
-DESCRIPTION
-
- When gdb is configured to use /proc, it should not be calling
- or otherwise attempting to use ptrace. In order to catch errors
- where use of /proc is configured, but some routine is still calling
- ptrace, we provide a local version of a function with that name
- that does nothing but issue an error message.
-*/
-
-int
-ptrace (request, pid, arg3, arg4)
- int request;
- int pid;
- PTRACE_ARG3_TYPE arg3;
- int arg4;
-{
- error ("internal error - there is a call to ptrace() somewhere");
- /*NOTREACHED*/
+#if defined (SYS_sproc)
+ syscall_table[SYS_sproc] = "sproc";
+#endif
}
/*
static void
procfs_kill_inferior ()
{
- if (inferior_pid != 0)
- {
- unconditionally_kill_inferior ();
- target_mourn_inferior ();
- }
+ target_mourn_inferior ();
}
/*
SYNOPSIS
- static void unconditionally_kill_inferior (void)
+ static void unconditionally_kill_inferior (struct procinfo *)
DESCRIPTION
- Kill the current inferior. Should not be called until it
- is at least tested that there is an inferior.
+ Kill the specified inferior.
NOTE
A possibly useful enhancement would be to first try sending
the inferior a terminate signal, politely asking it to commit
- suicide, before we murder it.
+ suicide, before we murder it (we could call that
+ politely_kill_inferior()).
*/
static void
-unconditionally_kill_inferior ()
+unconditionally_kill_inferior (pi)
+ struct procinfo *pi;
{
int signo;
+ int ppid;
+ ppid = pi->prstatus.pr_ppid;
+
signo = SIGKILL;
- ioctl (pi.fd, PIOCKILL, &signo);
- close_proc_file (&pi);
- wait ((int *) 0);
+
+#ifdef PROCFS_NEED_CLEAR_CURSIG_FOR_KILL
+ /* Alpha OSF/1-3.x procfs needs a clear of the current signal
+ before the PIOCKILL, otherwise it might generate a corrupted core
+ file for the inferior. */
+ ioctl (pi->fd, PIOCSSIG, NULL);
+#endif
+#ifdef PROCFS_NEED_PIOCSSIG_FOR_KILL
+ /* Alpha OSF/1-2.x procfs needs a PIOCSSIG call with a SIGKILL signal
+ to kill the inferior, otherwise it might remain stopped with a
+ pending SIGKILL.
+ We do not check the result of the PIOCSSIG, the inferior might have
+ died already. */
+ {
+ struct siginfo newsiginfo;
+
+ memset ((char *) &newsiginfo, 0, sizeof (newsiginfo));
+ newsiginfo.si_signo = signo;
+ newsiginfo.si_code = 0;
+ newsiginfo.si_errno = 0;
+ newsiginfo.si_pid = getpid ();
+ newsiginfo.si_uid = getuid ();
+ ioctl (pi->fd, PIOCSSIG, &newsiginfo);
+ }
+#else
+ ioctl (pi->fd, PIOCKILL, &signo);
+#endif
+
+ close_proc_file (pi);
+
+/* Only wait() for our direct children. Our grandchildren zombies are killed
+ by the death of their parents. */
+
+ if (ppid == getpid())
+ wait ((int *) 0);
}
/*
struct target_ops *target; /* ignored */
{
int nbytes = 0;
+ struct procinfo *pi;
+
+ pi = current_procinfo;
- if (lseek (pi.fd, (off_t) memaddr, 0) == (off_t) memaddr)
+ if (lseek(pi->fd, (off_t) memaddr, 0) == (off_t) memaddr)
{
if (dowrite)
{
- nbytes = write (pi.fd, myaddr, len);
+ nbytes = write (pi->fd, myaddr, len);
}
else
{
- nbytes = read (pi.fd, myaddr, len);
+ nbytes = read (pi->fd, myaddr, len);
}
if (nbytes < 0)
{
procfs_store_registers (regno)
int regno;
{
+ struct procinfo *pi;
+
+ pi = current_procinfo;
+
if (regno != -1)
{
- ioctl (pi.fd, PIOCGREG, &pi.gregset);
+ ioctl (pi->fd, PIOCGREG, &pi->gregset);
}
- fill_gregset (&pi.gregset, regno);
- ioctl (pi.fd, PIOCSREG, &pi.gregset);
+ fill_gregset (&pi->gregset, regno);
+ ioctl (pi->fd, PIOCSREG, &pi->gregset);
#if defined (FP0_REGNUM)
if (regno != -1)
{
- ioctl (pi.fd, PIOCGFPREG, &pi.fpregset);
+ ioctl (pi->fd, PIOCGFPREG, &pi->fpregset);
}
- fill_fpregset (&pi.fpregset, regno);
- ioctl (pi.fd, PIOCSFPREG, &pi.fpregset);
+ fill_fpregset (&pi->fpregset, regno);
+ ioctl (pi->fd, PIOCSFPREG, &pi->fpregset);
#endif /* FP0_REGNUM */
LOCAL FUNCTION
- procfs_init_inferior - initialize access to a /proc entry
+ create_procinfo - initialize access to a /proc entry
SYNOPSIS
- void procfs_init_inferior (int pid)
+ struct procinfo * create_procinfo (int pid)
DESCRIPTION
- When gdb starts an inferior, this function is called in the parent
- process immediately after the fork. It waits for the child to stop
- on the return from the exec system call (the child itself takes care
- of ensuring that this is set up), then sets up the set of signals
- and faults that are to be traced.
+ Allocate a procinfo structure, open the /proc file and then set up the
+ set of signals and faults that are to be traced. Returns a pointer to
+ the new procinfo structure.
NOTES
*/
-static void
-procfs_init_inferior (pid)
+static struct procinfo *
+create_procinfo (pid)
int pid;
{
+ struct procinfo *pi;
- push_target (&procfs_ops);
+ pi = find_procinfo (pid, 1);
+ if (pi != NULL)
+ return pi; /* All done! It already exists */
- if (!open_proc_file (pid, &pi, O_RDWR))
- {
- proc_init_failed ("can't open process file");
- }
- else
- {
- memset ((char *) &pi.prrun, 0, sizeof (pi.prrun));
- prfillset (&pi.prrun.pr_trace);
- procfs_notice_signals ();
- prfillset (&pi.prrun.pr_fault);
- prdelset (&pi.prrun.pr_fault, FLTPAGE);
- if (ioctl (pi.fd, PIOCWSTOP, &pi.prstatus) < 0)
- {
- proc_init_failed ("PIOCWSTOP failed");
- }
- else if (ioctl (pi.fd, PIOCSFAULT, &pi.prrun.pr_fault) < 0)
- {
- proc_init_failed ("PIOCSFAULT failed");
- }
- }
-}
+ pi = (struct procinfo *) xmalloc (sizeof (struct procinfo));
-/*
+ if (!open_proc_file (pid, pi, O_RDWR))
+ proc_init_failed (pi, "can't open process file");
-GLOBAL FUNCTION
+ /* open_proc_file may modify pid. */
- procfs_notice_signals
+ pid = pi -> pid;
-SYNOPSIS
+ /* Add new process to process info list */
- static void procfs_notice_signals (void);
+ pi->next = procinfo_list;
+ procinfo_list = pi;
-DESCRIPTION
+ add_fd (pi); /* Add to list for poll/select */
- When the user changes the state of gdb's signal handling via the
- "handle" command, this function gets called to see if any change
- in the /proc interface is required. It is also called internally
- by other /proc interface functions to initialize the state of
- the traced signal set.
+ pi->num_syscall_handlers = 0;
+ pi->syscall_handlers = NULL;
+ memset ((char *) &pi->prrun, 0, sizeof (pi->prrun));
+ prfillset (&pi->prrun.pr_trace);
+ procfs_notice_signals (pid);
+ prfillset (&pi->prrun.pr_fault);
+ prdelset (&pi->prrun.pr_fault, FLTPAGE);
- One thing it does is that signals for which the state is "nostop",
- "noprint", and "pass", have their trace bits reset in the pr_trace
- field, so that they are no longer traced. This allows them to be
- delivered directly to the inferior without the debugger ever being
- involved.
- */
+#ifdef PROCFS_DONT_TRACE_FAULTS
+ premptyset (&pi->prrun.pr_fault);
+#endif
-static void
-procfs_notice_signals ()
-{
- int signo;
+ if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
+ proc_init_failed (pi, "PIOCSTATUS failed");
- if (pi.valid)
- {
- for (signo = 0; signo < NSIG; signo++)
- {
- if (signal_stop_state (signo) == 0 &&
- signal_print_state (signo) == 0 &&
- signal_pass_state (signo) == 1)
- {
- prdelset (&pi.prrun.pr_trace, signo);
- }
- else
- {
- praddset (&pi.prrun.pr_trace, signo);
- }
- }
- if (ioctl (pi.fd, PIOCSTRACE, &pi.prrun.pr_trace))
- {
- print_sys_errmsg ("PIOCSTRACE failed", errno);
- }
- }
+/* A bug in Solaris (2.5 at least) causes PIOCWSTOP to hang on LWPs that are
+ already stopped, even if they all have PR_ASYNC set. */
+
+ if (!(pi->prstatus.pr_flags & PR_STOPPED))
+ if (ioctl (pi->fd, PIOCWSTOP, &pi->prstatus) < 0)
+ proc_init_failed (pi, "PIOCWSTOP failed");
+
+ if (ioctl (pi->fd, PIOCSFAULT, &pi->prrun.pr_fault) < 0)
+ proc_init_failed (pi, "PIOCSFAULT failed");
+
+ return pi;
}
/*
LOCAL FUNCTION
- proc_set_exec_trap -- arrange for exec'd child to halt at startup
+ procfs_exit_handler - handle entry into the _exit syscall
SYNOPSIS
- void proc_set_exec_trap (void)
+ int procfs_exit_handler (pi, syscall_num, why, rtnvalp, statvalp)
DESCRIPTION
- This function is called in the child process when starting up
- an inferior, prior to doing the exec of the actual inferior.
- It sets the child process's exitset to make exit from the exec
- system call an event of interest to stop on, and then simply
- returns. The child does the exec, the system call returns, and
- the child stops at the first instruction, ready for the gdb
- parent process to take control of it.
+ This routine is called when an inferior process enters the _exit()
+ system call. It continues the process, and then collects the exit
+ status and pid which are returned in *statvalp and *rtnvalp. After
+ that it returns non-zero to indicate that procfs_wait should wake up.
-NOTE
+NOTES
+ There is probably a better way to do this.
+
+ */
+
+static int
+procfs_exit_handler (pi, syscall_num, why, rtnvalp, statvalp)
+ struct procinfo *pi;
+ int syscall_num;
+ int why;
+ int *rtnvalp;
+ int *statvalp;
+{
+ pi->prrun.pr_flags = PRCFAULT;
+
+ if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
+ perror_with_name (pi->pathname);
+
+ *rtnvalp = wait (statvalp);
+ if (*rtnvalp >= 0)
+ *rtnvalp = pi->pid;
+
+ return 1;
+}
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_exec_handler - handle exit from the exec family of syscalls
+
+SYNOPSIS
+
+ int procfs_exec_handler (pi, syscall_num, why, rtnvalp, statvalp)
+
+DESCRIPTION
+
+ This routine is called when an inferior process is about to finish any
+ of the exec() family of system calls. It pretends that we got a
+ SIGTRAP (for compatibility with ptrace behavior), and returns non-zero
+ to tell procfs_wait to wake up.
+
+NOTES
+ This need for compatibility with ptrace is questionable. In the
+ future, it shouldn't be necessary.
+
+ */
+
+static int
+procfs_exec_handler (pi, syscall_num, why, rtnvalp, statvalp)
+ struct procinfo *pi;
+ int syscall_num;
+ int why;
+ int *rtnvalp;
+ int *statvalp;
+{
+ *statvalp = (SIGTRAP << 8) | 0177;
+
+ return 1;
+}
+
+#ifdef SYS_sproc /* IRIX lwp creation system call */
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_sproc_handler - handle exit from the sproc syscall
+
+SYNOPSIS
+
+ int procfs_sproc_handler (pi, syscall_num, why, rtnvalp, statvalp)
+
+DESCRIPTION
+
+ This routine is called when an inferior process is about to finish an
+ sproc() system call. This is the system call that IRIX uses to create
+ a lightweight process. When the target process gets this event, we can
+ look at rval1 to find the new child processes ID, and create a new
+ procinfo struct from that.
+
+ After that, it pretends that we got a SIGTRAP, and returns non-zero
+ to tell procfs_wait to wake up. Subsequently, wait_for_inferior gets
+ woken up, sees the new process and continues it.
+
+NOTES
+ We actually never see the child exiting from sproc because we will
+ shortly stop the child with PIOCSTOP, which is then registered as the
+ event of interest.
+ */
+
+static int
+procfs_sproc_handler (pi, syscall_num, why, rtnvalp, statvalp)
+ struct procinfo *pi;
+ int syscall_num;
+ int why;
+ int *rtnvalp;
+ int *statvalp;
+{
+/* We've just detected the completion of an sproc system call. Now we need to
+ setup a procinfo struct for this thread, and notify the thread system of the
+ new arrival. */
+
+/* If sproc failed, then nothing interesting happened. Continue the process
+ and go back to sleep. */
+
+ if (pi->prstatus.pr_errno != 0)
+ {
+ pi->prrun.pr_flags &= PRSTEP;
+ pi->prrun.pr_flags |= PRCFAULT;
+
+ if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
+ perror_with_name (pi->pathname);
+
+ return 0;
+ }
+
+ /* At this point, the new thread is stopped at it's first instruction, and
+ the parent is stopped at the exit from sproc. */
+
+ /* Notify the caller of the arrival of a new thread. */
+ create_procinfo (pi->prstatus.pr_rval1);
+
+ *rtnvalp = pi->prstatus.pr_rval1;
+ *statvalp = (SIGTRAP << 8) | 0177;
+
+ return 1;
+}
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_fork_handler - handle exit from the fork syscall
+
+SYNOPSIS
+
+ int procfs_fork_handler (pi, syscall_num, why, rtnvalp, statvalp)
+
+DESCRIPTION
+
+ This routine is called when an inferior process is about to finish a
+ fork() system call. We will open up the new process, and then close
+ it, which releases it from the clutches of the debugger.
+
+ After that, we continue the target process as though nothing had
+ happened.
+
+NOTES
+ This is necessary for IRIX because we have to set PR_FORK in order
+ to catch the creation of lwps (via sproc()). When an actual fork
+ occurs, it becomes necessary to reset the forks debugger flags and
+ continue it because we can't hack multiple processes yet.
+ */
+
+static int
+procfs_fork_handler (pi, syscall_num, why, rtnvalp, statvalp)
+ struct procinfo *pi;
+ int syscall_num;
+ int why;
+ int *rtnvalp;
+ int *statvalp;
+{
+ struct procinfo *pitemp;
+
+/* At this point, we've detected the completion of a fork (or vfork) call in
+ our child. The grandchild is also stopped because we set inherit-on-fork
+ earlier. (Note that nobody has the grandchilds' /proc file open at this
+ point.) We will release the grandchild from the debugger by opening it's
+ /proc file and then closing it. Since run-on-last-close is set, the
+ grandchild continues on its' merry way. */
+
+
+ pitemp = create_procinfo (pi->prstatus.pr_rval1);
+ if (pitemp)
+ close_proc_file (pitemp);
+
+ if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
+ perror_with_name (pi->pathname);
+
+ return 0;
+}
+#endif /* SYS_sproc */
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_init_inferior - initialize target vector and access to a
+ /proc entry
+
+SYNOPSIS
+
+ int procfs_init_inferior (int pid)
+
+DESCRIPTION
+
+ When gdb starts an inferior, this function is called in the parent
+ process immediately after the fork. It waits for the child to stop
+ on the return from the exec system call (the child itself takes care
+ of ensuring that this is set up), then sets up the set of signals
+ and faults that are to be traced. Returns the pid, which may have had
+ the thread-id added to it.
+
+NOTES
+
+ If proc_init_failed ever gets called, control returns to the command
+ processing loop via the standard error handling code.
+
+ */
+
+static int
+procfs_init_inferior (pid)
+ int pid;
+{
+ struct procinfo *pip;
+
+ push_target (&procfs_ops);
+
+ pip = create_procinfo (pid);
+
+ procfs_set_syscall_trap (pip, SYS_exit, PROCFS_SYSCALL_ENTRY,
+ procfs_exit_handler);
+
+#ifndef PRFS_STOPEXEC
+#ifdef SYS_exec
+ procfs_set_syscall_trap (pip, SYS_exec, PROCFS_SYSCALL_EXIT,
+ procfs_exec_handler);
+#endif
+#ifdef SYS_execv
+ procfs_set_syscall_trap (pip, SYS_execv, PROCFS_SYSCALL_EXIT,
+ procfs_exec_handler);
+#endif
+#ifdef SYS_execve
+ procfs_set_syscall_trap (pip, SYS_execve, PROCFS_SYSCALL_EXIT,
+ procfs_exec_handler);
+#endif
+#endif /* PRFS_STOPEXEC */
+
+ /* Setup traps on exit from sproc() */
+
+#ifdef SYS_sproc
+ procfs_set_syscall_trap (pip, SYS_sproc, PROCFS_SYSCALL_EXIT,
+ procfs_sproc_handler);
+ procfs_set_syscall_trap (pip, SYS_fork, PROCFS_SYSCALL_EXIT,
+ procfs_fork_handler);
+#ifdef SYS_vfork
+ procfs_set_syscall_trap (pip, SYS_vfork, PROCFS_SYSCALL_EXIT,
+ procfs_fork_handler);
+#endif
+/* Turn on inherit-on-fork flag so that all children of the target process
+ start with tracing flags set. This allows us to trap lwp creation. Note
+ that we also have to trap on fork and vfork in order to disable all tracing
+ in the targets child processes. */
+
+ modify_inherit_on_fork_flag (pip->fd, 1);
+#endif
+
+#ifdef SYS_lwp_create
+ procfs_set_syscall_trap (pip, SYS_lwp_create, PROCFS_SYSCALL_EXIT,
+ procfs_lwp_creation_handler);
+#endif
+
+ /* create_procinfo may change the pid, so we have to update inferior_pid
+ here before calling other gdb routines that need the right pid. */
+
+ pid = pip -> pid;
+ inferior_pid = pid;
+
+ add_thread (pip -> pid); /* Setup initial thread */
+
+#ifdef START_INFERIOR_TRAPS_EXPECTED
+ startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
+#else
+ /* One trap to exec the shell, one to exec the program being debugged. */
+ startup_inferior (2);
+#endif
+
+ return pid;
+}
+
+/*
+
+GLOBAL FUNCTION
+
+ procfs_notice_signals
+
+SYNOPSIS
+
+ static void procfs_notice_signals (int pid);
+
+DESCRIPTION
+
+ When the user changes the state of gdb's signal handling via the
+ "handle" command, this function gets called to see if any change
+ in the /proc interface is required. It is also called internally
+ by other /proc interface functions to initialize the state of
+ the traced signal set.
+
+ One thing it does is that signals for which the state is "nostop",
+ "noprint", and "pass", have their trace bits reset in the pr_trace
+ field, so that they are no longer traced. This allows them to be
+ delivered directly to the inferior without the debugger ever being
+ involved.
+ */
+
+static void
+procfs_notice_signals (pid)
+ int pid;
+{
+ int signo;
+ struct procinfo *pi;
+
+ pi = find_procinfo (pid, 0);
+
+ for (signo = 0; signo < NSIG; signo++)
+ {
+ if (signal_stop_state (target_signal_from_host (signo)) == 0 &&
+ signal_print_state (target_signal_from_host (signo)) == 0 &&
+ signal_pass_state (target_signal_from_host (signo)) == 1)
+ {
+ prdelset (&pi->prrun.pr_trace, signo);
+ }
+ else
+ {
+ praddset (&pi->prrun.pr_trace, signo);
+ }
+ }
+ if (ioctl (pi->fd, PIOCSTRACE, &pi->prrun.pr_trace))
+ {
+ print_sys_errmsg ("PIOCSTRACE failed", errno);
+ }
+}
+
+/*
+
+LOCAL FUNCTION
+
+ proc_set_exec_trap -- arrange for exec'd child to halt at startup
+
+SYNOPSIS
+
+ void proc_set_exec_trap (void)
+
+DESCRIPTION
+
+ This function is called in the child process when starting up
+ an inferior, prior to doing the exec of the actual inferior.
+ It sets the child process's exitset to make exit from the exec
+ system call an event of interest to stop on, and then simply
+ returns. The child does the exec, the system call returns, and
+ the child stops at the first instruction, ready for the gdb
+ parent process to take control of it.
+
+NOTE
We need to use all local variables since the child may be sharing
it's data space with the parent, if vfork was used rather than
proc_set_exec_trap ()
{
sysset_t exitset;
+ sysset_t entryset;
auto char procname[32];
int fd;
if ((fd = open (procname, O_RDWR)) < 0)
{
perror (procname);
- fflush (stderr);
+ gdb_flush (gdb_stderr);
_exit (127);
}
premptyset (&exitset);
+ premptyset (&entryset);
+#ifdef PIOCSSPCACT
+ /* Under Alpha OSF/1 we have to use a PIOCSSPCACT ioctl to trace
+ exits from exec system calls because of the user level loader. */
+ {
+ int prfs_flags;
+
+ if (ioctl (fd, PIOCGSPCACT, &prfs_flags) < 0)
+ {
+ perror (procname);
+ gdb_flush (gdb_stderr);
+ _exit (127);
+ }
+ prfs_flags |= PRFS_STOPEXEC;
+ if (ioctl (fd, PIOCSSPCACT, &prfs_flags) < 0)
+ {
+ perror (procname);
+ gdb_flush (gdb_stderr);
+ _exit (127);
+ }
+ }
+#else
/* GW: Rationale...
Not all systems with /proc have all the exec* syscalls with the same
names. On the SGI, for example, there is no SYS_exec, but there
praddset (&exitset, SYS_execve);
#endif
#ifdef SYS_execv
- praddset(&exitset, SYS_execv);
+ praddset (&exitset, SYS_execv);
#endif
if (ioctl (fd, PIOCSEXIT, &exitset) < 0)
{
perror (procname);
- fflush (stderr);
+ gdb_flush (gdb_stderr);
_exit (127);
}
+#endif
+
+ praddset (&entryset, SYS_exit);
+
+ if (ioctl (fd, PIOCSENTRY, &entryset) < 0)
+ {
+ perror (procname);
+ gdb_flush (gdb_stderr);
+ _exit (126);
+ }
/* Turn off inherit-on-fork flag so that all grand-children of gdb
start with tracing flags cleared. */
-#if defined (PIOCRESET) /* New method */
- {
- long pr_flags;
- pr_flags = PR_FORK;
- ioctl (fd, PIOCRESET, &pr_flags);
- }
-#else
-#if defined (PIOCRFORK) /* Original method */
- ioctl (fd, PIOCRFORK, NULL);
-#endif
-#endif
+ modify_inherit_on_fork_flag (fd, 0);
/* Turn on run-on-last-close flag so that this process will not hang
if GDB goes away for some reason. */
-#if defined (PIOCSET) /* New method */
+ modify_run_on_last_close_flag (fd, 1);
+
+#ifdef PR_ASYNC
{
- long pr_flags;
- pr_flags = PR_RLC;
- (void) ioctl (fd, PIOCSET, &pr_flags);
+ long pr_flags;
+
+/* Solaris needs this to make procfs treat all threads seperately. Without
+ this, all threads halt whenever something happens to any thread. Since
+ GDB wants to control all this itself, it needs to set PR_ASYNC. */
+
+ pr_flags = PR_ASYNC;
+
+ ioctl (fd, PIOCSET, &pr_flags);
}
-#else
-#if defined (PIOCSRLC) /* Original method */
- (void) ioctl (fd, PIOCSRLC, 0);
-#endif
-#endif
+#endif /* PR_ASYNC */
}
/*
int funcstat = 0;
struct prmap *prmaps;
struct prmap *prmap;
+ struct procinfo *pi;
- if (pi.valid && (ioctl (pi.fd, PIOCNMAP, &nmap) == 0))
+ pi = current_procinfo;
+
+ if (ioctl (pi->fd, PIOCNMAP, &nmap) == 0)
{
prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
- if (ioctl (pi.fd, PIOCMAP, prmaps) == 0)
+ if (ioctl (pi->fd, PIOCMAP, prmaps) == 0)
{
for (prmap = prmaps; prmap -> pr_size && funcstat == 0; ++prmap)
{
- fd = proc_address_to_fd ((CORE_ADDR) prmap -> pr_vaddr, 0);
+ fd = proc_address_to_fd (pi, (CORE_ADDR) prmap -> pr_vaddr, 0);
funcstat = (*func) (fd, (CORE_ADDR) prmap -> pr_vaddr);
close (fd);
}
struct prmap *prmaps;
struct prmap *prmap;
CORE_ADDR baseaddr = 0;
+ struct procinfo *pi;
+
+ pi = current_procinfo;
- if (pi.valid && (ioctl (pi.fd, PIOCNMAP, &nmap) == 0))
+ if (ioctl (pi->fd, PIOCNMAP, &nmap) == 0)
{
prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
- if (ioctl (pi.fd, PIOCMAP, prmaps) == 0)
+ if (ioctl (pi->fd, PIOCMAP, prmaps) == 0)
{
for (prmap = prmaps; prmap -> pr_size; ++prmap)
{
SYNOPSIS
- int proc_address_to_fd (CORE_ADDR addr, complain)
+ int proc_address_to_fd (struct procinfo *pi, CORE_ADDR addr, complain)
DESCRIPTION
*/
static int
-proc_address_to_fd (addr, complain)
+proc_address_to_fd (pi, addr, complain)
+ struct procinfo *pi;
CORE_ADDR addr;
int complain;
{
int fd = -1;
- if (pi.valid)
+ if ((fd = ioctl (pi->fd, PIOCOPENM, (caddr_t *) &addr)) < 0)
{
- if ((fd = ioctl (pi.fd, PIOCOPENM, (caddr_t *) &addr)) < 0)
+ if (complain)
{
- if (complain)
- {
- print_sys_errmsg (pi.pathname, errno);
- warning ("can't find mapped file for address 0x%x", addr);
- }
+ print_sys_errmsg (pi->pathname, errno);
+ warning ("can't find mapped file for address 0x%x", addr);
}
}
return (fd);
exec_file = (char *) get_exec_file (0);
if (exec_file)
- printf ("Attaching program `%s', pid %d\n", exec_file, pid);
+ printf_unfiltered ("Attaching to program `%s', %s\n", exec_file, target_pid_to_str (pid));
else
- printf ("Attaching pid %d\n", pid);
+ printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid));
- fflush (stdout);
+ gdb_flush (gdb_stdout);
}
- do_attach (pid);
- inferior_pid = pid;
+ inferior_pid = pid = do_attach (pid);
push_target (&procfs_ops);
}
char *exec_file = get_exec_file (0);
if (exec_file == 0)
exec_file = "";
- printf ("Detaching program: %s pid %d\n",
- exec_file, inferior_pid);
- fflush (stdout);
+ printf_unfiltered ("Detaching from program: %s %s\n",
+ exec_file, target_pid_to_str (inferior_pid));
+ gdb_flush (gdb_stdout);
}
if (args)
siggnal = atoi (args);
procfs_files_info (ignore)
struct target_ops *ignore;
{
- printf ("\tUsing the running image of %s process %d via /proc.\n",
- attach_flag? "attached": "child", inferior_pid);
+ printf_unfiltered ("\tUsing the running image of %s %s via /proc.\n",
+ attach_flag? "attached": "child", target_pid_to_str (inferior_pid));
}
/* ARGSUSED */
do_attach (pid)
int pid;
{
- int result;
+ struct procinfo *pi;
+
+ pi = (struct procinfo *) xmalloc (sizeof (struct procinfo));
- if (!open_proc_file (pid, &pi, O_RDWR))
+ if (!open_proc_file (pid, pi, O_RDWR))
{
- perror_with_name (pi.pathname);
+ free (pi);
+ perror_with_name (pi->pathname);
/* NOTREACHED */
}
+ pid = pi -> pid;
+
+ /* Add new process to process info list */
+
+ pi->next = procinfo_list;
+ procinfo_list = pi;
+
+ add_fd (pi); /* Add to list for poll/select */
+
/* Get current status of process and if it is not already stopped,
then stop it. Remember whether or not it was stopped when we first
examined it. */
- if (ioctl (pi.fd, PIOCSTATUS, &pi.prstatus) < 0)
+ if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
{
- print_sys_errmsg (pi.pathname, errno);
- close_proc_file (&pi);
+ print_sys_errmsg (pi->pathname, errno);
+ close_proc_file (pi);
error ("PIOCSTATUS failed");
}
- if (pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
+ if (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
{
- pi.was_stopped = 1;
+ pi->was_stopped = 1;
}
else
{
- pi.was_stopped = 0;
+ pi->was_stopped = 0;
if (1 || query ("Process is currently running, stop it? "))
{
/* Make it run again when we close it. */
-#if defined (PIOCSET) /* New method */
- {
- long pr_flags;
- pr_flags = PR_RLC;
- result = ioctl (pi.fd, PIOCSET, &pr_flags);
- }
-#else
-#if defined (PIOCSRLC) /* Original method */
- result = ioctl (pi.fd, PIOCSRLC, 0);
-#endif
-#endif
- if (result < 0)
- {
- print_sys_errmsg (pi.pathname, errno);
- close_proc_file (&pi);
- error ("PIOCSRLC or PIOCSET failed");
- }
- if (ioctl (pi.fd, PIOCSTOP, &pi.prstatus) < 0)
+
+ modify_run_on_last_close_flag (pi->fd, 1);
+
+ if (ioctl (pi->fd, PIOCSTOP, &pi->prstatus) < 0)
{
- print_sys_errmsg (pi.pathname, errno);
- close_proc_file (&pi);
+ print_sys_errmsg (pi->pathname, errno);
+ close_proc_file (pi);
error ("PIOCSTOP failed");
}
- pi.nopass_next_sigstop = 1;
+ pi->nopass_next_sigstop = 1;
}
else
{
- printf ("Ok, gdb will wait for process %u to stop.\n", pid);
+ printf_unfiltered ("Ok, gdb will wait for %s to stop.\n", target_pid_to_str (pid));
}
}
/* Remember some things about the inferior that we will, or might, change
so that we can restore them when we detach. */
- ioctl (pi.fd, PIOCGTRACE, &pi.saved_trace);
- ioctl (pi.fd, PIOCGHOLD, &pi.saved_sighold);
- ioctl (pi.fd, PIOCGFAULT, &pi.saved_fltset);
- ioctl (pi.fd, PIOCGENTRY, &pi.saved_entryset);
- ioctl (pi.fd, PIOCGEXIT, &pi.saved_exitset);
+ ioctl (pi->fd, PIOCGTRACE, &pi->saved_trace);
+ ioctl (pi->fd, PIOCGHOLD, &pi->saved_sighold);
+ ioctl (pi->fd, PIOCGFAULT, &pi->saved_fltset);
+ ioctl (pi->fd, PIOCGENTRY, &pi->saved_entryset);
+ ioctl (pi->fd, PIOCGEXIT, &pi->saved_exitset);
/* Set up trace and fault sets, as gdb expects them. */
- memset (&pi.prrun, 0, sizeof (pi.prrun));
- prfillset (&pi.prrun.pr_trace);
- procfs_notice_signals ();
- prfillset (&pi.prrun.pr_fault);
- prdelset (&pi.prrun.pr_fault, FLTPAGE);
- if (ioctl (pi.fd, PIOCSFAULT, &pi.prrun.pr_fault))
+ memset (&pi->prrun, 0, sizeof (pi->prrun));
+ prfillset (&pi->prrun.pr_trace);
+ procfs_notice_signals (pid);
+ prfillset (&pi->prrun.pr_fault);
+ prdelset (&pi->prrun.pr_fault, FLTPAGE);
+
+#ifdef PROCFS_DONT_TRACE_FAULTS
+ premptyset (&pi->prrun.pr_fault);
+#endif
+
+ if (ioctl (pi->fd, PIOCSFAULT, &pi->prrun.pr_fault))
{
print_sys_errmsg ("PIOCSFAULT failed", errno);
}
- if (ioctl (pi.fd, PIOCSTRACE, &pi.prrun.pr_trace))
+ if (ioctl (pi->fd, PIOCSTRACE, &pi->prrun.pr_trace))
{
print_sys_errmsg ("PIOCSTRACE failed", errno);
}
do_detach (signal)
int signal;
{
- int result;
+ struct procinfo *pi;
+
+ pi = current_procinfo;
if (signal)
{
- set_proc_siginfo (&pi, signal);
+ set_proc_siginfo (pi, signal);
}
- if (ioctl (pi.fd, PIOCSEXIT, &pi.saved_exitset) < 0)
+ if (ioctl (pi->fd, PIOCSEXIT, &pi->saved_exitset) < 0)
{
- print_sys_errmsg (pi.pathname, errno);
- printf ("PIOCSEXIT failed.\n");
+ print_sys_errmsg (pi->pathname, errno);
+ printf_unfiltered ("PIOCSEXIT failed.\n");
}
- if (ioctl (pi.fd, PIOCSENTRY, &pi.saved_entryset) < 0)
+ if (ioctl (pi->fd, PIOCSENTRY, &pi->saved_entryset) < 0)
{
- print_sys_errmsg (pi.pathname, errno);
- printf ("PIOCSENTRY failed.\n");
+ print_sys_errmsg (pi->pathname, errno);
+ printf_unfiltered ("PIOCSENTRY failed.\n");
}
- if (ioctl (pi.fd, PIOCSTRACE, &pi.saved_trace) < 0)
+ if (ioctl (pi->fd, PIOCSTRACE, &pi->saved_trace) < 0)
{
- print_sys_errmsg (pi.pathname, errno);
- printf ("PIOCSTRACE failed.\n");
+ print_sys_errmsg (pi->pathname, errno);
+ printf_unfiltered ("PIOCSTRACE failed.\n");
}
- if (ioctl (pi.fd, PIOCSHOLD, &pi.saved_sighold) < 0)
+ if (ioctl (pi->fd, PIOCSHOLD, &pi->saved_sighold) < 0)
{
- print_sys_errmsg (pi.pathname, errno);
- printf ("PIOSCHOLD failed.\n");
+ print_sys_errmsg (pi->pathname, errno);
+ printf_unfiltered ("PIOSCHOLD failed.\n");
}
- if (ioctl (pi.fd, PIOCSFAULT, &pi.saved_fltset) < 0)
+ if (ioctl (pi->fd, PIOCSFAULT, &pi->saved_fltset) < 0)
{
- print_sys_errmsg (pi.pathname, errno);
- printf ("PIOCSFAULT failed.\n");
+ print_sys_errmsg (pi->pathname, errno);
+ printf_unfiltered ("PIOCSFAULT failed.\n");
}
- if (ioctl (pi.fd, PIOCSTATUS, &pi.prstatus) < 0)
+ if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
{
- print_sys_errmsg (pi.pathname, errno);
- printf ("PIOCSTATUS failed.\n");
+ print_sys_errmsg (pi->pathname, errno);
+ printf_unfiltered ("PIOCSTATUS failed.\n");
}
else
{
- if (signal || (pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
+ if (signal || (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
{
- if (signal || !pi.was_stopped ||
+ if (signal || !pi->was_stopped ||
query ("Was stopped when attached, make it runnable again? "))
{
+ /* Clear any pending signal if we want to detach without
+ a signal. */
+ if (signal == 0)
+ set_proc_siginfo (pi, signal);
+
/* Clear any fault that might have stopped it. */
- if (ioctl (pi.fd, PIOCCFAULT, 0))
- {
- print_sys_errmsg (pi.pathname, errno);
- printf ("PIOCCFAULT failed.\n");
- }
+ if (ioctl (pi->fd, PIOCCFAULT, 0))
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ printf_unfiltered ("PIOCCFAULT failed.\n");
+ }
/* Make it run again when we close it. */
-#if defined (PIOCSET) /* New method */
- {
- long pr_flags;
- pr_flags = PR_RLC;
- result = ioctl (pi.fd, PIOCSET, &pr_flags);
- }
-#else
-#if defined (PIOCSRLC) /* Original method */
- result = ioctl (pi.fd, PIOCSRLC, 0);
-#endif
-#endif
- if (result)
- {
- print_sys_errmsg (pi.pathname, errno);
- printf ("PIOCSRLC or PIOCSET failed.\n");
- }
+
+ modify_run_on_last_close_flag (pi->fd, 1);
}
}
}
- close_proc_file (&pi);
+ close_proc_file (pi);
attach_flag = 0;
}
-/*
-
-LOCAL FUNCTION
-
- procfs_wait -- emulate wait() as much as possible
- Wait for child to do something. Return pid of child, or -1 in case
- of error; store status through argument pointer STATUS.
-
-
-SYNOPSIS
-
- int procfs_wait (int *statloc)
-
-DESCRIPTION
-
- Try to emulate wait() as much as possible. Not sure why we can't
- just use wait(), but it seems to have problems when applied to a
- process being controlled with the /proc interface.
-
-NOTES
-
- We have a race problem here with no obvious solution. We need to let
- the inferior run until it stops on an event of interest, which means
- that we need to use the PIOCWSTOP ioctl. However, we cannot use this
- ioctl if the process is already stopped on something that is not an
- event of interest, or the call will hang indefinitely. Thus we first
- use PIOCSTATUS to see if the process is not stopped. If not, then we
- use PIOCWSTOP. But during the window between the two, if the process
- stops for any reason that is not an event of interest (such as a job
- control signal) then gdb will hang. One possible workaround is to set
- an alarm to wake up every minute of so and check to see if the process
- is still running, and if so, then reissue the PIOCWSTOP. But this is
- a real kludge, so has not been implemented. FIXME: investigate
- alternatives.
-
- FIXME: Investigate why wait() seems to have problems with programs
- being control by /proc routines.
-
- */
+/* emulate wait() as much as possible.
+ Wait for child to do something. Return pid of child, or -1 in case
+ of error; store status in *OURSTATUS.
+
+ Not sure why we can't
+ just use wait(), but it seems to have problems when applied to a
+ process being controlled with the /proc interface.
+
+ We have a race problem here with no obvious solution. We need to let
+ the inferior run until it stops on an event of interest, which means
+ that we need to use the PIOCWSTOP ioctl. However, we cannot use this
+ ioctl if the process is already stopped on something that is not an
+ event of interest, or the call will hang indefinitely. Thus we first
+ use PIOCSTATUS to see if the process is not stopped. If not, then we
+ use PIOCWSTOP. But during the window between the two, if the process
+ stops for any reason that is not an event of interest (such as a job
+ control signal) then gdb will hang. One possible workaround is to set
+ an alarm to wake up every minute of so and check to see if the process
+ is still running, and if so, then reissue the PIOCWSTOP. But this is
+ a real kludge, so has not been implemented. FIXME: investigate
+ alternatives.
+
+ FIXME: Investigate why wait() seems to have problems with programs
+ being control by /proc routines. */
static int
-procfs_wait (statloc)
- int *statloc;
+procfs_wait (pid, ourstatus)
+ int pid;
+ struct target_waitstatus *ourstatus;
{
short what;
short why;
int statval = 0;
int checkerr = 0;
int rtnval = -1;
-
- if (ioctl (pi.fd, PIOCSTATUS, &pi.prstatus) < 0)
+ struct procinfo *pi;
+
+ if (pid != -1) /* Non-specific process? */
+ pi = NULL;
+ else
+ for (pi = procinfo_list; pi; pi = pi->next)
+ if (pi->had_event)
+ break;
+
+ if (!pi)
{
- checkerr++;
+ wait_again:
+
+ if (pi)
+ pi->had_event = 0;
+
+ pi = wait_fd ();
}
- else if (!(pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
- {
- if (attach_flag)
- set_sigint_trap(); /* Causes SIGINT to be passed on to the
- attached process. */
- if (ioctl (pi.fd, PIOCWSTOP, &pi.prstatus) < 0)
+ if (pid != -1)
+ for (pi = procinfo_list; pi; pi = pi->next)
+ if (pi->pid == pid && pi->had_event)
+ break;
+
+ if (!pi && !checkerr)
+ goto wait_again;
+
+ if (!checkerr && !(pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
+ {
+ if (ioctl (pi->fd, PIOCWSTOP, &pi->prstatus) < 0)
{
checkerr++;
}
-
- if (attach_flag)
- clear_sigint_trap();
}
if (checkerr)
{
rtnval = wait (&statval);
if (rtnval != inferior_pid)
{
- print_sys_errmsg (pi.pathname, errno);
+ print_sys_errmsg (pi->pathname, errno);
error ("PIOCWSTOP, wait failed, returned %d", rtnval);
/* NOTREACHED */
}
}
else
{
- print_sys_errmsg (pi.pathname, errno);
+ print_sys_errmsg (pi->pathname, errno);
error ("PIOCSTATUS or PIOCWSTOP failed.");
/* NOTREACHED */
}
}
- else if (pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
+ else if (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
{
- rtnval = pi.prstatus.pr_pid;
- why = pi.prstatus.pr_why;
- what = pi.prstatus.pr_what;
- if (why == PR_SIGNALLED)
+ rtnval = pi->pid;
+ why = pi->prstatus.pr_why;
+ what = pi->prstatus.pr_what;
+
+ switch (why)
{
+ case PR_SIGNALLED:
statval = (what << 8) | 0177;
- }
- else if ((why == PR_SYSEXIT)
- &&
- (
-#ifdef SYS_exec
- what == SYS_exec
-#else
- 0 == 0
-#endif
-#ifdef SYS_execve
- || what == SYS_execve
-#endif
-#ifdef SYS_execv
- || what == SYS_execv
-#endif
- ))
- {
- statval = (SIGTRAP << 8) | 0177;
- }
- else if (why == PR_REQUESTED)
- {
+ break;
+ case PR_SYSENTRY:
+ case PR_SYSEXIT:
+ {
+ int i;
+ int found_handler = 0;
+
+ for (i = 0; i < pi->num_syscall_handlers; i++)
+ if (pi->syscall_handlers[i].syscall_num == what)
+ {
+ found_handler = 1;
+ if (!pi->syscall_handlers[i].func (pi, what, why,
+ &rtnval, &statval))
+ goto wait_again;
+
+ break;
+ }
+
+ if (!found_handler)
+ if (why == PR_SYSENTRY)
+ error ("PR_SYSENTRY, unhandled system call %d", what);
+ else
+ error ("PR_SYSEXIT, unhandled system call %d", what);
+ }
+ break;
+ case PR_REQUESTED:
statval = (SIGSTOP << 8) | 0177;
- }
- else if (why == PR_JOBCONTROL)
- {
+ break;
+ case PR_JOBCONTROL:
statval = (what << 8) | 0177;
- }
- else if (why == PR_FAULTED)
- {
+ break;
+ case PR_FAULTED:
switch (what)
{
+#ifdef FLTWATCH
+ case FLTWATCH:
+ statval = (SIGTRAP << 8) | 0177;
+ break;
+#endif
+#ifdef FLTKWATCH
+ case FLTKWATCH:
+ statval = (SIGTRAP << 8) | 0177;
+ break;
+#endif
+#ifndef FAULTED_USE_SIGINFO
+ /* Irix, contrary to the documentation, fills in 0 for si_signo.
+ Solaris fills in si_signo. I'm not sure about others. */
case FLTPRIV:
case FLTILL:
statval = (SIGILL << 8) | 0177;
case FLTBPT:
case FLTTRACE:
statval = (SIGTRAP << 8) | 0177;
- break;
+ break;
case FLTSTACK:
case FLTACCESS:
case FLTBOUNDS:
statval = (SIGFPE << 8) | 0177;
break;
case FLTPAGE: /* Recoverable page fault */
+#endif /* not FAULTED_USE_SIGINFO */
default:
- rtnval = -1;
- error ("PIOCWSTOP, unknown why %d, what %d", why, what);
- /* NOTREACHED */
+ /* Use the signal which the kernel assigns. This is better than
+ trying to second-guess it from the fault. In fact, I suspect
+ that FLTACCESS can be either SIGSEGV or SIGBUS. */
+ statval = ((pi->prstatus.pr_info.si_signo) << 8) | 0177;
+ break;
}
- }
- else
- {
- rtnval = -1;
+ break;
+ default:
error ("PIOCWSTOP, unknown why %d, what %d", why, what);
- /* NOTREACHED */
}
+/* Stop all the other threads when any of them stops. */
+
+ {
+ struct procinfo *procinfo;
+
+ for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
+ {
+ if (!procinfo->had_event)
+ {
+ /* A bug in Solaris (2.5) causes us to hang when trying to
+ stop a stopped process. So, we have to check first in
+ order to avoid the hang. */
+ if (ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus) < 0)
+ {
+ print_sys_errmsg (procinfo->pathname, errno);
+ error ("PIOCSTATUS failed");
+ }
+ if (!(procinfo->prstatus.pr_flags & PR_STOPPED))
+ if (ioctl (procinfo->fd, PIOCSTOP, &procinfo->prstatus) < 0)
+ {
+ print_sys_errmsg (procinfo->pathname, errno);
+ error ("PIOCSTOP failed");
+ }
+ }
+ }
+ }
}
else
{
error ("PIOCWSTOP, stopped for unknown/unhandled reason, flags %#x",
- pi.prstatus.pr_flags);
- /* NOTREACHED */
+ pi->prstatus.pr_flags);
}
- if (statloc)
- {
- *statloc = statval;
- }
+ store_waitstatus (ourstatus, statval);
if (rtnval == -1) /* No more children to wait for */
{
- fprintf (stderr, "Child process unexpectedly missing.\n");
- *statloc = 42; /* Claim it exited with signal 42 */
+ fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing.\n");
+ /* Claim it exited with unknown signal. */
+ ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
+ ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
return rtnval;
}
+ pi->had_event = 0; /* Indicate that we've seen this one */
return (rtnval);
}
struct siginfo newsiginfo;
struct siginfo *sip;
- if (pip -> valid)
+#ifdef PROCFS_DONT_PIOCSSIG_CURSIG
+ /* With Alpha OSF/1 procfs, the kernel gets really confused if it
+ receives a PIOCSSIG with a signal identical to the current signal,
+ it messes up the current signal. Work around the kernel bug. */
+ if (signo == pip -> prstatus.pr_cursig)
+ return;
+#endif
+
+ if (signo == pip -> prstatus.pr_info.si_signo)
{
- if (signo == pip -> prstatus.pr_info.si_signo)
- {
- sip = &pip -> prstatus.pr_info;
- }
- else
- {
- memset ((char *) &newsiginfo, 0, sizeof (newsiginfo));
- sip = &newsiginfo;
- sip -> si_signo = signo;
- sip -> si_code = 0;
- sip -> si_errno = 0;
- sip -> si_pid = getpid ();
- sip -> si_uid = getuid ();
- }
- if (ioctl (pip -> fd, PIOCSSIG, sip) < 0)
- {
- print_sys_errmsg (pip -> pathname, errno);
- warning ("PIOCSSIG failed");
- }
+ sip = &pip -> prstatus.pr_info;
+ }
+ else
+ {
+ memset ((char *) &newsiginfo, 0, sizeof (newsiginfo));
+ sip = &newsiginfo;
+ sip -> si_signo = signo;
+ sip -> si_code = 0;
+ sip -> si_errno = 0;
+ sip -> si_pid = getpid ();
+ sip -> si_uid = getuid ();
+ }
+ if (ioctl (pip -> fd, PIOCSSIG, sip) < 0)
+ {
+ print_sys_errmsg (pip -> pathname, errno);
+ warning ("PIOCSSIG failed");
}
}
-/* Resume execution of the inferior process. If STEP is nozero, then
+/* Resume execution of process PID. If STEP is nozero, then
just single step it. If SIGNAL is nonzero, restart it with that
signal activated. */
static void
-procfs_resume (step, signo)
+procfs_resume (pid, step, signo)
+ int pid;
int step;
- int signo;
+ enum target_signal signo;
{
int signal_to_pass;
+ struct procinfo *pi, *procinfo;
+
+ pi = find_procinfo (pid == -1 ? inferior_pid : pid, 0);
errno = 0;
- pi.prrun.pr_flags = PRSTRACE | PRSFAULT | PRCFAULT;
+ pi->prrun.pr_flags = PRSTRACE | PRSFAULT | PRCFAULT;
#if 0
/* It should not be necessary. If the user explicitly changes the value,
random garbage. We have to rely on the fact that PC and nPC have been
written previously via PIOCSREG during a register flush. */
- pi.prrun.pr_vaddr = (caddr_t) *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)];
- pi.prrun.pr_flags != PRSVADDR;
+ pi->prrun.pr_vaddr = (caddr_t) *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)];
+ pi->prrun.pr_flags != PRSVADDR;
#endif
#endif
- if (signo == SIGSTOP && pi.nopass_next_sigstop)
+ if (signo == TARGET_SIGNAL_STOP && pi->nopass_next_sigstop)
/* When attaching to a child process, if we forced it to stop with
a PIOCSTOP, then we will have set the nopass_next_sigstop flag.
Upon resuming the first time after such a stop, we explicitly
deal with the inferior a little smarter, and possibly even allow
an inferior to continue running at the same time as gdb. (FIXME?) */
signal_to_pass = 0;
- else if (signo == SIGTSTP
- && pi.prstatus.pr_cursig == SIGTSTP
- && pi.prstatus.pr_action.sa_handler == SIG_DFL)
+ else if (signo == TARGET_SIGNAL_TSTP
+ && pi->prstatus.pr_cursig == SIGTSTP
+ && pi->prstatus.pr_action.sa_handler == SIG_DFL)
/* We are about to pass the inferior a SIGTSTP whose action is
SIG_DFL. The SIG_DFL action for a SIGTSTP is to stop
because the handler needs to get executed. */
signal_to_pass = 0;
else
- signal_to_pass = signo;
+ signal_to_pass = target_signal_to_host (signo);
if (signal_to_pass)
{
- set_proc_siginfo (&pi, signal_to_pass);
+ set_proc_siginfo (pi, signal_to_pass);
}
else
{
- pi.prrun.pr_flags |= PRCSIG;
+ pi->prrun.pr_flags |= PRCSIG;
}
- pi.nopass_next_sigstop = 0;
+ pi->nopass_next_sigstop = 0;
if (step)
{
- pi.prrun.pr_flags |= PRSTEP;
+ pi->prrun.pr_flags |= PRSTEP;
}
- if (ioctl (pi.fd, PIOCRUN, &pi.prrun) != 0)
+
+ /* Don't try to start a process unless it's stopped on an
+ `event of interest'. Doing so will cause errors. */
+
+ if ((pi->prstatus.pr_flags & PR_ISTOP)
+ && ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
{
- perror_with_name (pi.pathname);
+ perror_with_name (pi->pathname);
/* NOTREACHED */
}
+
+ pi->had_event = 0;
+
+ /* Continue all the other threads that haven't had an event of
+ interest. */
+
+ if (pid == -1)
+ for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
+ {
+ if (pi != procinfo && !procinfo->had_event)
+ {
+ procinfo->prrun.pr_flags &= PRSTEP;
+ procinfo->prrun.pr_flags |= PRCFAULT | PRCSIG;
+ ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus);
+
+ /* Don't try to start a process unless it's stopped on an
+ `event of interest'. Doing so will cause errors. */
+
+ if ((procinfo->prstatus.pr_flags & PR_ISTOP)
+ && ioctl (procinfo->fd, PIOCRUN, &procinfo->prrun) < 0)
+ {
+ if (ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus) < 0)
+ {
+ fprintf_unfiltered(gdb_stderr, "PIOCSTATUS failed, errno=%d\n", errno);
+ }
+ print_sys_errmsg (procinfo->pathname, errno);
+ error ("PIOCRUN failed");
+ }
+ ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus);
+ }
+ }
}
/*
procfs_fetch_registers (regno)
int regno;
{
- if (ioctl (pi.fd, PIOCGREG, &pi.gregset) != -1)
+ struct procinfo *pi;
+
+ pi = current_procinfo;
+
+ if (ioctl (pi->fd, PIOCGREG, &pi->gregset) != -1)
{
- supply_gregset (&pi.gregset);
+ supply_gregset (&pi->gregset);
}
#if defined (FP0_REGNUM)
- if (ioctl (pi.fd, PIOCGFPREG, &pi.fpregset) != -1)
+ if (ioctl (pi->fd, PIOCGFPREG, &pi->fpregset) != -1)
{
- supply_fpregset (&pi.fpregset);
+ supply_fpregset (&pi->fpregset);
}
#endif
}
LOCAL FUNCTION
- proc_init_failed - called whenever /proc access initialization fails
+ proc_init_failed - called whenever /proc access initialization
+fails
SYNOPSIS
- static void proc_init_failed (char *why)
+ static void proc_init_failed (struct procinfo *pi, char *why)
DESCRIPTION
*/
static void
-proc_init_failed (why)
+proc_init_failed (pi, why)
+ struct procinfo *pi;
char *why;
{
- print_sys_errmsg (pi.pathname, errno);
- kill (pi.pid, SIGKILL);
- close_proc_file (&pi);
+ print_sys_errmsg (pi->pathname, errno);
+ kill (pi->pid, SIGKILL);
+ close_proc_file (pi);
error (why);
/* NOTREACHED */
}
close_proc_file (pip)
struct procinfo *pip;
{
- pip -> pid = 0;
- if (pip -> valid)
- {
- close (pip -> fd);
- }
- pip -> fd = -1;
- if (pip -> pathname)
- {
- free (pip -> pathname);
- pip -> pathname = NULL;
- }
- pip -> valid = 0;
+ struct procinfo *procinfo;
+
+ remove_fd (pip); /* Remove fd from poll/select list */
+
+ close (pip -> fd);
+
+ free (pip -> pathname);
+
+ /* Unlink pip from the procinfo chain. Note pip might not be on the list. */
+
+ if (procinfo_list == pip)
+ procinfo_list = pip->next;
+ else
+ for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
+ if (procinfo->next == pip)
+ procinfo->next = pip->next;
+
+ free (pip);
}
/*
Note that the pathname is left intact, even when the open fails,
so that callers can use it to construct meaningful error messages
rather than just "file open failed".
+
+ Note that for Solaris, the process-id also includes an LWP-id, so we
+ actually attempt to open that. If we are handed a pid with a 0 LWP-id,
+ then we will ask the kernel what it is and add it to the pid. Hence,
+ the pid can be changed by us.
*/
static int
struct procinfo *pip;
int mode;
{
- pip -> valid = 0; /* FIXME, what is this? ?! */
- if (pip -> valid)
- {
- close (pip -> fd);
- }
- if (pip -> pathname == NULL)
- {
- pip -> pathname = xmalloc (32);
+ int tmp, tmpfd;
+
+ pip -> next = NULL;
+ pip -> had_event = 0;
+ pip -> pathname = xmalloc (32);
+ pip -> pid = pid;
+
+#ifndef PIOCOPENLWP
+ tmp = pid;
+#else
+ tmp = pid & 0xffff;
+#endif
+
+ sprintf (pip -> pathname, PROC_NAME_FMT, tmp);
+ if ((tmpfd = open (pip -> pathname, mode)) < 0)
+ return 0;
+
+#ifndef PIOCOPENLWP
+ pip -> fd = tmpfd;
+#else
+ tmp = (pid >> 16) & 0xffff; /* Extract thread id */
+
+ if (tmp == 0)
+ { /* Don't know thread id yet */
+ if (ioctl (tmpfd, PIOCSTATUS, &pip -> prstatus) < 0)
+ {
+ print_sys_errmsg (pip -> pathname, errno);
+ close (tmpfd);
+ error ("open_proc_file: PIOCSTATUS failed");
+ }
+
+ tmp = pip -> prstatus.pr_who; /* Get thread id from prstatus_t */
+ pip -> pid = (tmp << 16) | pid; /* Update pip */
}
- sprintf (pip -> pathname, PROC_NAME_FMT, pid);
- if ((pip -> fd = open (pip -> pathname, mode)) >= 0)
+
+ if ((pip -> fd = ioctl (tmpfd, PIOCOPENLWP, &tmp)) < 0)
{
- pip -> valid = 1;
- pip -> pid = pid;
+ close (tmpfd);
+ return 0;
}
- return (pip -> valid);
+
+#ifdef PIOCSET /* New method */
+ {
+ long pr_flags;
+ pr_flags = PR_ASYNC;
+ ioctl (pip -> fd, PIOCSET, &pr_flags);
+ }
+#endif
+
+ close (tmpfd); /* All done with main pid */
+#endif /* PIOCOPENLWP */
+
+ return 1;
}
static char *
}
if (sip -> si_code <= 0)
{
- printf_filtered ("sent by pid %d, uid %d ", sip -> si_pid,
+ printf_filtered ("sent by %s, uid %d ",
+ target_pid_to_str (sip -> si_pid),
sip -> si_uid);
}
else
(sip -> si_signo == SIGSEGV) ||
(sip -> si_signo == SIGBUS))
{
- printf_filtered ("addr=%#x ", sip -> si_addr);
+ printf_filtered ("addr=%#lx ",
+ (unsigned long) sip -> si_addr);
}
else if ((sip -> si_signo == SIGCHLD))
{
- printf_filtered ("child pid %u, status %u ",
- sip -> si_pid,
+ printf_filtered ("child %s, status %u ",
+ target_pid_to_str (sip -> si_pid),
sip -> si_status);
}
else if ((sip -> si_signo == SIGPOLL))
}
if (sip -> si_code <= 0)
{
- printf_filtered ("\t%-16u %s\n", sip -> si_pid,
+ printf_filtered ("\t%-16u %s\n", sip -> si_pid, /* XXX need target_pid_to_str() */
"PID of process sending signal");
printf_filtered ("\t%-16u %s\n", sip -> si_uid,
"UID of process sending signal");
if ((sip -> si_signo == SIGILL) ||
(sip -> si_signo == SIGFPE))
{
- printf_filtered ("\t%-16#x %s.\n", sip -> si_addr,
+ printf_filtered ("\t%#-16lx %s.\n",
+ (unsigned long) sip -> si_addr,
"Address of faulting instruction");
}
else if ((sip -> si_signo == SIGSEGV) ||
(sip -> si_signo == SIGBUS))
{
- printf_filtered ("\t%-16#x %s.\n", sip -> si_addr,
+ printf_filtered ("\t%#-16lx %s.\n",
+ (unsigned long) sip -> si_addr,
"Address of faulting memory reference");
}
else if ((sip -> si_signo == SIGCHLD))
{
- printf_filtered ("\t%-16u %s.\n", sip -> si_pid,
+ printf_filtered ("\t%-16u %s.\n", sip -> si_pid, /* XXX need target_pid_to_str() */
"Child process ID");
printf_filtered ("\t%-16u %s.\n", sip -> si_status,
"Child process exit value or signal");
{
QUIT;
if (syscall_table[syscallnum] != NULL)
- {
- printf_filtered ("\t%-12s ", syscall_table[syscallnum]);
- printf_filtered ("%-8s ",
- prismember (&pip -> entryset, syscallnum)
- ? "on" : "off");
- printf_filtered ("%-8s ",
- prismember (&pip -> exitset, syscallnum)
- ? "on" : "off");
- printf_filtered ("\n");
- }
- }
+ printf_filtered ("\t%-12s ", syscall_table[syscallnum]);
+ else
+ printf_filtered ("\t%-12d ", syscallnum);
+
+ printf_filtered ("%-8s ",
+ prismember (&pip -> entryset, syscallnum)
+ ? "on" : "off");
+ printf_filtered ("%-8s ",
+ prismember (&pip -> exitset, syscallnum)
+ ? "on" : "off");
+ printf_filtered ("\n");
+ }
printf_filtered ("\n");
}
}
signalname (signo)
int signo;
{
- char *name;
+ const char *name;
static char locbuf[32];
name = strsigno (signo);
errnoname (errnum)
int errnum;
{
- char *name;
+ const char *name;
static char locbuf[32];
name = strerrno (errnum);
printf_filtered ("%-8s ",
prismember (&pip -> prstatus.pr_sighold, signo)
? "on" : "off");
+
+#ifdef PROCFS_SIGPEND_OFFSET
+ /* Alpha OSF/1 numbers the pending signals from 1. */
+ printf_filtered ("%-8s ",
+ (signo ? prismember (&pip -> prstatus.pr_sigpend,
+ signo - 1)
+ : 0)
+ ? "yes" : "no");
+#else
printf_filtered ("%-8s ",
prismember (&pip -> prstatus.pr_sigpend, signo)
? "yes" : "no");
+#endif
printf_filtered (" %s\n", safe_strsignal (signo));
}
printf_filtered ("\n");
if (!summary)
{
printf_filtered ("Mapped address spaces:\n\n");
+#ifdef BFD_HOST_64_BIT
+ printf_filtered (" %18s %18s %10s %10s %7s\n",
+#else
printf_filtered ("\t%10s %10s %10s %10s %7s\n",
+#endif
"Start Addr",
" End Addr",
" Size",
{
for (prmap = prmaps; prmap -> pr_size; ++prmap)
{
- printf_filtered ("\t%#10x %#10x %#10x %#10x %7s\n",
- prmap -> pr_vaddr,
- prmap -> pr_vaddr + prmap -> pr_size - 1,
+#ifdef BFD_HOST_64_BIT
+ printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n",
+#else
+ printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n",
+#endif
+ (unsigned long)prmap -> pr_vaddr,
+ (unsigned long)prmap -> pr_vaddr
+ + prmap -> pr_size - 1,
prmap -> pr_size,
prmap -> pr_off,
mappingflags (prmap -> pr_mflags));
char *args;
int from_tty;
{
- int pid;
- struct procinfo pii;
+ int pid = inferior_pid;
struct procinfo *pip;
struct cleanup *old_chain;
char **argv;
int id = 0;
int status = 0;
int all = 0;
+ int nlwp;
+ int *lwps;
old_chain = make_cleanup (null_cleanup, 0);
- /* Default to using the current inferior if no pid specified */
+ /* Default to using the current inferior if no pid specified. Note
+ that inferior_pid may be 0, hence we set okerr. */
- pip = π
+ pip = find_procinfo (inferior_pid, 1);
if (args != NULL)
{
summary = 0;
times = 1;
}
- else if ((pii.pid = atoi (*argv)) > 0)
+ else if ((pid = atoi (*argv)) > 0)
{
- pid = pii.pid;
- pip = &pii;
- memset (&pii, 0, sizeof (pii));
+ pip = (struct procinfo *) xmalloc (sizeof (struct procinfo));
+ memset (pip, 0, sizeof (*pip));
+
+ pip->pid = pid;
if (!open_proc_file (pid, pip, O_RDONLY))
{
perror_with_name (pip -> pathname);
/* NOTREACHED */
}
+ pid = pip->pid;
make_cleanup (close_proc_file, pip);
}
else if (**argv != '\000')
/* If we don't have a valid open process at this point, then we have no
inferior or didn't specify a specific pid. */
- if (!pip -> valid)
+ if (!pip)
{
error ("\
No process. Start debugging a program or specify an explicit process ID.");
error ("PIOCSTATUS failed");
}
- /* Print verbose information of the requested type(s), or just a summary
- of the information for all types. */
+#ifdef PIOCLWPIDS
+ nlwp = pip->prstatus.pr_nlwp;
+ lwps = alloca ((2 * nlwp + 2) * sizeof (id_t));
- printf_filtered ("\nInformation for %s:\n\n", pip -> pathname);
- if (summary || all || flags)
+ if (ioctl (pip->fd, PIOCLWPIDS, lwps))
{
- info_proc_flags (pip, summary);
+ print_sys_errmsg (pip -> pathname, errno);
+ error ("PIOCSTATUS failed");
}
- if (summary || all)
+#else /* PIOCLWPIDS */
+ nlwp = 1;
+ lwps = alloca ((2 * nlwp + 2) * sizeof *lwps);
+ lwps[0] = 0;
+#endif /* PIOCLWPIDS */
+
+ for (; nlwp > 0; nlwp--, lwps++)
{
- info_proc_stop (pip, summary);
+ pip = find_procinfo ((*lwps << 16) | pid, 1);
+
+ if (!pip)
+ {
+ pip = (struct procinfo *) xmalloc (sizeof (struct procinfo));
+ memset (pip, 0, sizeof (*pip));
+ if (!open_proc_file ((*lwps << 16) | pid, pip, O_RDONLY))
+ continue;
+
+ make_cleanup (close_proc_file, pip);
+
+ if (ioctl (pip -> fd, PIOCSTATUS, &(pip -> prstatus)) < 0)
+ {
+ print_sys_errmsg (pip -> pathname, errno);
+ error ("PIOCSTATUS failed");
+ }
+ }
+
+ /* Print verbose information of the requested type(s), or just a summary
+ of the information for all types. */
+
+ printf_filtered ("\nInformation for %s.%d:\n\n", pip -> pathname, *lwps);
+ if (summary || all || flags)
+ {
+ info_proc_flags (pip, summary);
+ }
+ if (summary || all)
+ {
+ info_proc_stop (pip, summary);
+ }
+ if (summary || all || signals || faults)
+ {
+ info_proc_siginfo (pip, summary);
+ }
+ if (summary || all || syscalls)
+ {
+ info_proc_syscalls (pip, summary);
+ }
+ if (summary || all || mappings)
+ {
+ info_proc_mappings (pip, summary);
+ }
+ if (summary || all || signals)
+ {
+ info_proc_signals (pip, summary);
+ }
+ if (summary || all || faults)
+ {
+ info_proc_faults (pip, summary);
+ }
+ printf_filtered ("\n");
+
+ /* All done, deal with closing any temporary process info structure,
+ freeing temporary memory , etc. */
+
+ do_cleanups (old_chain);
}
- if (summary || all || signals || faults)
+}
+
+/*
+
+LOCAL FUNCTION
+
+ modify_inherit_on_fork_flag - Change the inherit-on-fork flag
+
+SYNOPSIS
+
+ void modify_inherit_on_fork_flag (fd, flag)
+
+DESCRIPTION
+
+ Call this routine to modify the inherit-on-fork flag. This routine is
+ just a nice wrapper to hide the #ifdefs needed by various systems to
+ control this flag.
+
+ */
+
+static void
+modify_inherit_on_fork_flag (fd, flag)
+ int fd;
+ int flag;
+{
+#ifdef PIOCSET
+ long pr_flags;
+#endif
+ int retval;
+
+#ifdef PIOCSET /* New method */
+ pr_flags = PR_FORK;
+ if (flag)
+ retval = ioctl (fd, PIOCSET, &pr_flags);
+ else
+ retval = ioctl (fd, PIOCRESET, &pr_flags);
+
+#else
+#ifdef PIOCSFORK /* Original method */
+ if (flag)
+ retval = ioctl (fd, PIOCSFORK, NULL);
+ else
+ retval = ioctl (fd, PIOCRFORK, NULL);
+#else
+ Neither PR_FORK nor PIOCSFORK exist!!!
+#endif
+#endif
+
+ if (!retval)
+ return;
+
+ print_sys_errmsg ("modify_inherit_on_fork_flag", errno);
+ error ("PIOCSFORK or PR_FORK modification failed");
+}
+
+/*
+
+LOCAL FUNCTION
+
+ modify_run_on_last_close_flag - Change the run-on-last-close flag
+
+SYNOPSIS
+
+ void modify_run_on_last_close_flag (fd, flag)
+
+DESCRIPTION
+
+ Call this routine to modify the run-on-last-close flag. This routine
+ is just a nice wrapper to hide the #ifdefs needed by various systems to
+ control this flag.
+
+ */
+
+static void
+modify_run_on_last_close_flag (fd, flag)
+ int fd;
+ int flag;
+{
+#ifdef PIOCSET
+ long pr_flags;
+#endif
+ int retval;
+
+#ifdef PIOCSET /* New method */
+ pr_flags = PR_RLC;
+ if (flag)
+ retval = ioctl (fd, PIOCSET, &pr_flags);
+ else
+ retval = ioctl (fd, PIOCRESET, &pr_flags);
+
+#else
+#ifdef PIOCSRLC /* Original method */
+ if (flag)
+ retval = ioctl (fd, PIOCSRLC, NULL);
+ else
+ retval = ioctl (fd, PIOCRRLC, NULL);
+#else
+ Neither PR_RLC nor PIOCSRLC exist!!!
+#endif
+#endif
+
+ if (!retval)
+ return;
+
+ print_sys_errmsg ("modify_run_on_last_close_flag", errno);
+ error ("PIOCSRLC or PR_RLC modification failed");
+}
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_clear_syscall_trap -- Deletes the trap for the specified system call.
+
+SYNOPSIS
+
+ void procfs_clear_syscall_trap (struct procinfo *, int syscall_num, int errok)
+
+DESCRIPTION
+
+ This function function disables traps for the specified system call.
+ errok is non-zero if errors should be ignored.
+ */
+
+static void
+procfs_clear_syscall_trap (pi, syscall_num, errok)
+ struct procinfo *pi;
+ int syscall_num;
+ int errok;
+{
+ sysset_t sysset;
+ int goterr, i;
+
+ goterr = ioctl (pi->fd, PIOCGENTRY, &sysset) < 0;
+
+ if (goterr && !errok)
{
- info_proc_siginfo (pip, summary);
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCGENTRY failed");
}
- if (summary || all || syscalls)
+
+ if (!goterr)
{
- info_proc_syscalls (pip, summary);
+ prdelset (&sysset, syscall_num);
+
+ if ((ioctl (pi->fd, PIOCSENTRY, &sysset) < 0) && !errok)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCSENTRY failed");
+ }
}
- if (summary || all || mappings)
+
+ goterr = ioctl (pi->fd, PIOCGEXIT, &sysset) < 0;
+
+ if (goterr && !errok)
{
- info_proc_mappings (pip, summary);
+ procfs_clear_syscall_trap (pi, syscall_num, 1);
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCGEXIT failed");
}
- if (summary || all || signals)
+
+ if (!goterr)
{
- info_proc_signals (pip, summary);
+ praddset (&sysset, syscall_num);
+
+ if ((ioctl (pi->fd, PIOCSEXIT, &sysset) < 0) && !errok)
+ {
+ procfs_clear_syscall_trap (pi, syscall_num, 1);
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCSEXIT failed");
+ }
}
- if (summary || all || faults)
+
+ if (!pi->syscall_handlers)
{
- info_proc_faults (pip, summary);
+ if (!errok)
+ error ("procfs_clear_syscall_trap: syscall_handlers is empty");
+ return;
}
- printf_filtered ("\n");
- /* All done, deal with closing any temporary process info structure,
- freeing temporary memory , etc. */
+ /* Remove handler func from the handler list */
+
+ for (i = 0; i < pi->num_syscall_handlers; i++)
+ if (pi->syscall_handlers[i].syscall_num == syscall_num)
+ {
+ if (i + 1 != pi->num_syscall_handlers)
+ { /* Not the last entry.
+ Move subsequent entries fwd. */
+ memcpy (&pi->syscall_handlers[i], &pi->syscall_handlers[i + 1],
+ (pi->num_syscall_handlers - i - 1)
+ * sizeof (struct procfs_syscall_handler));
+ }
+
+ pi->syscall_handlers = xrealloc (pi->syscall_handlers,
+ (pi->num_syscall_handlers - 1)
+ * sizeof (struct procfs_syscall_handler));
+ pi->num_syscall_handlers--;
+ return;
+ }
+
+ if (!errok)
+ error ("procfs_clear_syscall_trap: Couldn't find handler for sys call %d",
+ syscall_num);
+}
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_set_syscall_trap -- arrange for a function to be called when the
+ child executes the specified system call.
+
+SYNOPSIS
+
+ void procfs_set_syscall_trap (struct procinfo *, int syscall_num, int flags,
+ syscall_func_t *function)
+
+DESCRIPTION
+
+ This function sets up an entry and/or exit trap for the specified system
+ call. When the child executes the specified system call, your function
+ will be called with the call #, a flag that indicates entry or exit, and
+ pointers to rtnval and statval (which are used by procfs_wait). The
+ function should return non-zero if something interesting happened, zero
+ otherwise.
+ */
+
+static void
+procfs_set_syscall_trap (pi, syscall_num, flags, func)
+ struct procinfo *pi;
+ int syscall_num;
+ int flags;
+ syscall_func_t *func;
+{
+ sysset_t sysset;
+
+ if (flags & PROCFS_SYSCALL_ENTRY)
+ {
+ if (ioctl (pi->fd, PIOCGENTRY, &sysset) < 0)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCGENTRY failed");
+ }
+
+ praddset (&sysset, syscall_num);
+
+ if (ioctl (pi->fd, PIOCSENTRY, &sysset) < 0)
+ {
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCSENTRY failed");
+ }
+ }
+
+ if (flags & PROCFS_SYSCALL_EXIT)
+ {
+ if (ioctl (pi->fd, PIOCGEXIT, &sysset) < 0)
+ {
+ procfs_clear_syscall_trap (pi, syscall_num, 1);
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCGEXIT failed");
+ }
+
+ praddset (&sysset, syscall_num);
+
+ if (ioctl (pi->fd, PIOCSEXIT, &sysset) < 0)
+ {
+ procfs_clear_syscall_trap (pi, syscall_num, 1);
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCSEXIT failed");
+ }
+ }
+
+ if (!pi->syscall_handlers)
+ {
+ pi->syscall_handlers = xmalloc (sizeof (struct procfs_syscall_handler));
+ pi->syscall_handlers[0].syscall_num = syscall_num;
+ pi->syscall_handlers[0].func = func;
+ pi->num_syscall_handlers = 1;
+ }
+ else
+ {
+ int i;
+
+ for (i = 0; i < pi->num_syscall_handlers; i++)
+ if (pi->syscall_handlers[i].syscall_num == syscall_num)
+ {
+ pi->syscall_handlers[i].func = func;
+ return;
+ }
+
+ pi->syscall_handlers = xrealloc (pi->syscall_handlers, (i + 1)
+ * sizeof (struct procfs_syscall_handler));
+ pi->syscall_handlers[i].syscall_num = syscall_num;
+ pi->syscall_handlers[i].func = func;
+ pi->num_syscall_handlers++;
+ }
+}
+
+#ifdef SYS_lwp_create
+
+/*
+
+LOCAL FUNCTION
+
+ procfs_lwp_creation_handler - handle exit from the _lwp_create syscall
+
+SYNOPSIS
+
+ int procfs_lwp_creation_handler (pi, syscall_num, why, rtnvalp, statvalp)
+
+DESCRIPTION
+
+ This routine is called both when an inferior process and it's new lwp
+ are about to finish a _lwp_create() system call. This is the system
+ call that Solaris uses to create a lightweight process. When the
+ target process gets this event, we can look at sysarg[2] to find the
+ new childs lwp ID, and create a procinfo struct from that. After that,
+ we pretend that we got a SIGTRAP, and return non-zero to tell
+ procfs_wait to wake up. Subsequently, wait_for_inferior gets woken up,
+ sees the new process and continues it.
+
+ When we see the child exiting from lwp_create, we just contine it,
+ since everything was handled when the parent trapped.
+
+NOTES
+ In effect, we are only paying attention to the parent's completion of
+ the lwp_create syscall. If we only paid attention to the child
+ instead, then we wouldn't detect the creation of a suspended thread.
+ */
+
+static int
+procfs_lwp_creation_handler (pi, syscall_num, why, rtnvalp, statvalp)
+ struct procinfo *pi;
+ int syscall_num;
+ int why;
+ int *rtnvalp;
+ int *statvalp;
+{
+ int lwp_id;
+ struct procinfo *childpi;
+
+ /* We've just detected the completion of an lwp_create system call. Now we
+ need to setup a procinfo struct for this thread, and notify the thread
+ system of the new arrival. */
+
+ /* If lwp_create failed, then nothing interesting happened. Continue the
+ process and go back to sleep. */
+
+ if (pi->prstatus.pr_reg[R_PSR] & PS_FLAG_CARRY)
+ { /* _lwp_create failed */
+ pi->prrun.pr_flags &= PRSTEP;
+ pi->prrun.pr_flags |= PRCFAULT;
+
+ if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
+ perror_with_name (pi->pathname);
+
+ return 0;
+ }
+
+ /* At this point, the new thread is stopped at it's first instruction, and
+ the parent is stopped at the exit from lwp_create. */
+
+ if (pi->new_child) /* Child? */
+ { /* Yes, just continue it */
+ pi->prrun.pr_flags &= PRSTEP;
+ pi->prrun.pr_flags |= PRCFAULT;
+
+ if ((pi->prstatus.pr_flags & PR_ISTOP)
+ && ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
+ perror_with_name (pi->pathname);
- do_cleanups (old_chain);
+ pi->new_child = 0; /* No longer new */
+
+ return 0;
+ }
+
+ /* We're the proud parent of a new thread. Setup an exit trap for lwp_create
+ in the child and continue the parent. */
+
+ /* Third arg is pointer to new thread id. */
+ lwp_id = read_memory_integer (pi->prstatus.pr_sysarg[2], sizeof (int));
+
+ lwp_id = (lwp_id << 16) | PIDGET (pi->pid);
+
+ childpi = create_procinfo (lwp_id);
+
+ /* The new process has actually inherited the lwp_create syscall trap from
+ it's parent, but we still have to call this to register a handler for
+ that child. */
+
+ procfs_set_syscall_trap (childpi, SYS_lwp_create, PROCFS_SYSCALL_EXIT,
+ procfs_lwp_creation_handler);
+
+ childpi->new_child = 1; /* Flag this as an unseen child process */
+
+ *rtnvalp = lwp_id; /* the new arrival. */
+ *statvalp = (SIGTRAP << 8) | 0177;
+
+ return 1;
}
+#endif /* SYS_lwp_create */
/* Fork an inferior process, and start debugging it with /proc. */
char *allargs;
char **env;
{
+ char *shell_file = getenv ("SHELL");
+ char *tryname;
+ if (shell_file != NULL && strchr (shell_file, '/') == NULL)
+ {
+
+ /* We will be looking down the PATH to find shell_file. If we
+ just do this the normal way (via execlp, which operates by
+ attempting an exec for each element of the PATH until it
+ finds one which succeeds), then there will be an exec for
+ each failed attempt, each of which will cause a PR_SYSEXIT
+ stop, and we won't know how to distinguish the PR_SYSEXIT's
+ for these failed execs with the ones for successful execs
+ (whether the exec has succeeded is stored at that time in the
+ carry bit or some such architecture-specific and
+ non-ABI-specified place).
+
+ So I can't think of anything better than to search the PATH
+ now. This has several disadvantages: (1) There is a race
+ condition; if we find a file now and it is deleted before we
+ exec it, we lose, even if the deletion leaves a valid file
+ further down in the PATH, (2) there is no way to know exactly
+ what an executable (in the sense of "capable of being
+ exec'd") file is. Using access() loses because it may lose
+ if the caller is the superuser; failing to use it loses if
+ there are ACLs or some such. */
+
+ char *p;
+ char *p1;
+ /* FIXME-maybe: might want "set path" command so user can change what
+ path is used from within GDB. */
+ char *path = getenv ("PATH");
+ int len;
+ struct stat statbuf;
+
+ if (path == NULL)
+ path = "/bin:/usr/bin";
+
+ tryname = alloca (strlen (path) + strlen (shell_file) + 2);
+ for (p = path; p != NULL; p = p1 ? p1 + 1: NULL)
+ {
+ p1 = strchr (p, ':');
+ if (p1 != NULL)
+ len = p1 - p;
+ else
+ len = strlen (p);
+ strncpy (tryname, p, len);
+ tryname[len] = '\0';
+ strcat (tryname, "/");
+ strcat (tryname, shell_file);
+ if (access (tryname, X_OK) < 0)
+ continue;
+ if (stat (tryname, &statbuf) < 0)
+ continue;
+ if (!S_ISREG (statbuf.st_mode))
+ /* We certainly need to reject directories. I'm not quite
+ as sure about FIFOs, sockets, etc., but I kind of doubt
+ that people want to exec() these things. */
+ continue;
+ break;
+ }
+ if (p == NULL)
+ /* Not found. This must be an error rather than merely passing
+ the file to execlp(), because execlp() would try all the
+ exec()s, causing GDB to get confused. */
+ error ("Can't find shell %s in PATH", shell_file);
+
+ shell_file = tryname;
+ }
+
fork_inferior (exec_file, allargs, env,
- proc_set_exec_trap, procfs_init_inferior);
+ proc_set_exec_trap, procfs_init_inferior, shell_file);
+
/* We are at the first instruction we care about. */
/* Pedal to the metal... */
- proceed ((CORE_ADDR) -1, 0, 0);
+
+ proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
}
/* Clean up after the inferior dies. */
static void
procfs_mourn_inferior ()
{
+ struct procinfo *pi;
+ struct procinfo *next_pi;
+
+ for (pi = procinfo_list; pi; pi = next_pi)
+ {
+ next_pi = pi->next;
+ unconditionally_kill_inferior (pi);
+ }
+
unpush_target (&procfs_ops);
generic_mourn_inferior ();
}
+
/* Mark our target-struct as eligible for stray "run" and "attach" commands. */
static int
procfs_can_run ()
{
- return(1);
+ /* This variable is controlled by modules that sit atop procfs that may layer
+ their own process structure atop that provided here. sol-thread.c does
+ this because of the Solaris two-level thread model. */
+
+ return !procfs_suppress_run;
}
+#ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
+\f
+/* Insert a watchpoint */
+int
+procfs_set_watchpoint(pid, addr, len, rw)
+ int pid;
+ CORE_ADDR addr;
+ int len;
+ int rw;
+{
+ struct procinfo *pi;
+ prwatch_t wpt;
+
+ pi = find_procinfo (pid == -1 ? inferior_pid : pid, 0);
+ wpt.pr_vaddr = (caddr_t)addr;
+ wpt.pr_size = len;
+ wpt.pr_wflags = ((rw & 1) ? MA_READ : 0) | ((rw & 2) ? MA_WRITE : 0);
+ if (ioctl (pi->fd, PIOCSWATCH, &wpt) < 0)
+ {
+ if (errno == E2BIG)
+ return -1;
+ /* Currently it sometimes happens that the same watchpoint gets
+ deleted twice - don't die in this case (FIXME please) */
+ if (errno == ESRCH && len == 0)
+ return 0;
+ print_sys_errmsg (pi->pathname, errno);
+ error ("PIOCSWATCH failed");
+ }
+ return 0;
+}
+
+int
+procfs_stopped_by_watchpoint(pid)
+ int pid;
+{
+ struct procinfo *pi;
+ short what;
+ short why;
+
+ pi = find_procinfo (pid == -1 ? inferior_pid : pid, 0);
+ if (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
+ {
+ why = pi->prstatus.pr_why;
+ what = pi->prstatus.pr_what;
+ if (why == PR_FAULTED
+#if defined (FLTWATCH) && defined (FLTKWATCH)
+ && (what == FLTWATCH || what == FLTKWATCH)
+#else
+#ifdef FLTWATCH
+ && (what == FLTWATCH)
+#endif
+#ifdef FLTKWATCH
+ && (what == FLTKWATCH)
+#endif
+#endif
+ )
+ return what;
+ }
+ return 0;
+}
+#endif
+
+/* Why is this necessary? Shouldn't dead threads just be removed from the
+ thread database? */
+
+static int
+procfs_thread_alive (pid)
+ int pid;
+{
+ return 1;
+}
+
+/* Send a SIGINT to the process group. This acts just like the user typed a
+ ^C on the controlling terminal.
+
+ XXX - This may not be correct for all systems. Some may want to use
+ killpg() instead of kill (-pgrp). */
+
+static void
+procfs_stop ()
+{
+ extern pid_t inferior_process_group;
+
+ kill (-inferior_process_group, SIGINT);
+}
+\f
+/* Convert a pid to printable form. */
+
+#ifdef TIDGET
+char *
+procfs_pid_to_str (pid)
+ int pid;
+{
+ static char buf[100];
+
+ sprintf (buf, "Kernel thread %d", TIDGET (pid));
+
+ return buf;
+}
+#endif /* TIDGET */
\f
struct target_ops procfs_ops = {
"procfs", /* to_shortname */
procfs_mourn_inferior, /* to_mourn_inferior */
procfs_can_run, /* to_can_run */
procfs_notice_signals, /* to_notice_signals */
+ procfs_thread_alive, /* to_thread_alive */
+ procfs_stop, /* to_stop */
process_stratum, /* to_stratum */
0, /* to_next */
1, /* to_has_all_memory */
OPS_MAGIC /* to_magic */
};
-/*
-
-GLOBAL FUNCTION
-
- _initialize_procfs -- initialize the process file system stuff
-
-SYNOPSIS
-
- void _initialize_procfs (void)
-
-DESCRIPTION
-
- Do required initializations during gdb startup for using the
- /proc file system interface.
-
-*/
-
void
_initialize_procfs ()
{
+#ifdef HAVE_OPTIONAL_PROC_FS
+ char procname[32];
+ int fd;
+
+ /* If we have an optional /proc filesystem (e.g. under OSF/1),
+ don't add procfs support if we cannot access the running
+ GDB via /proc. */
+ sprintf (procname, PROC_NAME_FMT, getpid ());
+ if ((fd = open (procname, O_RDONLY)) < 0)
+ return;
+ close (fd);
+#endif
+
add_target (&procfs_ops);
add_info ("proc", info_proc,
projects / deliverable / binutils-gdb.git / blobdiff