/* Target-vector operations for controlling Unix child processes, for GDB.
- Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
+ Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996
+ Free Software Foundation, Inc.
Contributed by Cygnus Support.
+## Contains temporary hacks..
+
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
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. */
#include "defs.h"
#include "frame.h" /* required by inferior.h */
#include "inferior.h"
#include "target.h"
-#include "wait.h"
#include "gdbcore.h"
#include "command.h"
+#include "gdb_stat.h"
#include <signal.h>
+#include <sys/types.h>
+#include <fcntl.h>
+
+#ifdef HAVE_WAIT_H
+# include <wait.h>
+#else
+# ifdef HAVE_SYS_WAIT_H
+# include <sys/wait.h>
+# endif
+#endif
+
+/* "wait.h" fills in the gaps left by <wait.h> */
+#include "wait.h"
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+extern struct symtab_and_line *
+child_enable_exception_callback PARAMS ((enum exception_event_kind, int));
+
+extern struct exception_event_record *
+child_get_current_exception_event PARAMS ((void));
static void
child_prepare_to_store PARAMS ((void));
#ifndef CHILD_WAIT
-static int
-child_wait PARAMS ((int, struct target_waitstatus *));
+static int child_wait PARAMS ((int, struct target_waitstatus *));
#endif /* CHILD_WAIT */
-static void
-child_open PARAMS ((char *, int));
+#if !defined(CHILD_POST_WAIT)
+void
+child_post_wait PARAMS ((int, int));
+#endif
+
+static void child_open PARAMS ((char *, int));
static void
child_files_info PARAMS ((struct target_ops *));
static void
child_detach PARAMS ((char *, int));
+static void
+child_detach_from_process PARAMS ((int, char *, int, int));
+
static void
child_attach PARAMS ((char *, int));
static void
-ptrace_me PARAMS ((void));
+child_attach_to_process PARAMS ((char *, int, int));
+#if !defined(CHILD_POST_ATTACH)
static void
-ptrace_him PARAMS ((int));
+child_post_attach PARAMS ((int));
+#endif
+
+static void
+child_require_attach PARAMS ((char *, int));
static void
+child_require_detach PARAMS ((int, char *, int));
+
+static void
+ptrace_me PARAMS ((void));
+
+static void
+ptrace_him PARAMS ((int));
+
+static void
child_create_inferior PARAMS ((char *, char *, char **));
static void
static int
child_can_run PARAMS ((void));
+static void
+child_stop PARAMS ((void));
+
+#ifndef CHILD_THREAD_ALIVE
+int child_thread_alive PARAMS ((int));
+#endif
+
extern char **environ;
/* Forward declaration */
extern struct target_ops child_ops;
-/* Convert host signal to our signals. */
-enum target_signal
-target_signal_from_host (hostsig)
- int hostsig;
-{
- /* A switch statement would make sense but would require special kludges
- to deal with the cases where more than one signal has the same number. */
-
- if (hostsig == 0) return TARGET_SIGNAL_0;
-
-#if defined (SIGHUP)
- if (hostsig == SIGHUP) return TARGET_SIGNAL_HUP;
-#endif
-#if defined (SIGINT)
- if (hostsig == SIGINT) return TARGET_SIGNAL_INT;
-#endif
-#if defined (SIGQUIT)
- if (hostsig == SIGQUIT) return TARGET_SIGNAL_QUIT;
-#endif
-#if defined (SIGILL)
- if (hostsig == SIGILL) return TARGET_SIGNAL_ILL;
-#endif
-#if defined (SIGTRAP)
- if (hostsig == SIGTRAP) return TARGET_SIGNAL_TRAP;
-#endif
-#if defined (SIGABRT)
- if (hostsig == SIGABRT) return TARGET_SIGNAL_ABRT;
-#endif
-#if defined (SIGEMT)
- if (hostsig == SIGEMT) return TARGET_SIGNAL_EMT;
-#endif
-#if defined (SIGFPE)
- if (hostsig == SIGFPE) return TARGET_SIGNAL_FPE;
-#endif
-#if defined (SIGKILL)
- if (hostsig == SIGKILL) return TARGET_SIGNAL_KILL;
-#endif
-#if defined (SIGBUS)
- if (hostsig == SIGBUS) return TARGET_SIGNAL_BUS;
-#endif
-#if defined (SIGSEGV)
- if (hostsig == SIGSEGV) return TARGET_SIGNAL_SEGV;
-#endif
-#if defined (SIGSYS)
- if (hostsig == SIGSYS) return TARGET_SIGNAL_SYS;
-#endif
-#if defined (SIGPIPE)
- if (hostsig == SIGPIPE) return TARGET_SIGNAL_PIPE;
-#endif
-#if defined (SIGALRM)
- if (hostsig == SIGALRM) return TARGET_SIGNAL_ALRM;
-#endif
-#if defined (SIGTERM)
- if (hostsig == SIGTERM) return TARGET_SIGNAL_TERM;
-#endif
-#if defined (SIGUSR1)
- if (hostsig == SIGUSR1) return TARGET_SIGNAL_USR1;
-#endif
-#if defined (SIGUSR2)
- if (hostsig == SIGUSR2) return TARGET_SIGNAL_USR2;
-#endif
-#if defined (SIGCLD)
- if (hostsig == SIGCLD) return TARGET_SIGNAL_CHLD;
-#endif
-#if defined (SIGCHLD)
- if (hostsig == SIGCHLD) return TARGET_SIGNAL_CHLD;
-#endif
-#if defined (SIGPWR)
- if (hostsig == SIGPWR) return TARGET_SIGNAL_PWR;
-#endif
-#if defined (SIGWINCH)
- if (hostsig == SIGWINCH) return TARGET_SIGNAL_WINCH;
-#endif
-#if defined (SIGURG)
- if (hostsig == SIGURG) return TARGET_SIGNAL_URG;
-#endif
-#if defined (SIGIO)
- if (hostsig == SIGIO) return TARGET_SIGNAL_IO;
-#endif
-#if defined (SIGPOLL)
- if (hostsig == SIGPOLL) return TARGET_SIGNAL_POLL;
-#endif
-#if defined (SIGSTOP)
- if (hostsig == SIGSTOP) return TARGET_SIGNAL_STOP;
-#endif
-#if defined (SIGTSTP)
- if (hostsig == SIGTSTP) return TARGET_SIGNAL_TSTP;
-#endif
-#if defined (SIGCONT)
- if (hostsig == SIGCONT) return TARGET_SIGNAL_CONT;
-#endif
-#if defined (SIGTTIN)
- if (hostsig == SIGTTIN) return TARGET_SIGNAL_TTIN;
-#endif
-#if defined (SIGTTOU)
- if (hostsig == SIGTTOU) return TARGET_SIGNAL_TTOU;
-#endif
-#if defined (SIGVTALRM)
- if (hostsig == SIGVTALRM) return TARGET_SIGNAL_VTALRM;
-#endif
-#if defined (SIGPROF)
- if (hostsig == SIGPROF) return TARGET_SIGNAL_PROF;
-#endif
-#if defined (SIGXCPU)
- if (hostsig == SIGXCPU) return TARGET_SIGNAL_XCPU;
-#endif
-#if defined (SIGXFSZ)
- if (hostsig == SIGXFSZ) return TARGET_SIGNAL_XFSZ;
-#endif
-#if defined (SIGWIND)
- if (hostsig == SIGWIND) return TARGET_SIGNAL_WIND;
-#endif
-#if defined (SIGPHONE)
- if (hostsig == SIGPHONE) return TARGET_SIGNAL_PHONE;
-#endif
-#if defined (SIGLOST)
- if (hostsig == SIGLOST) return TARGET_SIGNAL_LOST;
-#endif
-#if defined (SIGWAITING)
- if (hostsig == SIGWAITING) return TARGET_SIGNAL_WAITING;
-#endif
-#if defined (SIGLWP)
- if (hostsig == SIGLWP) return TARGET_SIGNAL_LWP;
-#endif
-#if defined (SIGDANGER)
- if (hostsig == SIGDANGER) return TARGET_SIGNAL_DANGER;
-#endif
-#if defined (SIGGRANT)
- if (hostsig == SIGGRANT) return TARGET_SIGNAL_GRANT;
-#endif
-#if defined (SIGRETRACT)
- if (hostsig == SIGRETRACT) return TARGET_SIGNAL_RETRACT;
-#endif
-#if defined (SIGMSG)
- if (hostsig == SIGMSG) return TARGET_SIGNAL_MSG;
-#endif
-#if defined (SIGSOUND)
- if (hostsig == SIGSOUND) return TARGET_SIGNAL_SOUND;
-#endif
-#if defined (SIGSAK)
- if (hostsig == SIGSAK) return TARGET_SIGNAL_SAK;
-#endif
- return TARGET_SIGNAL_UNKNOWN;
-}
-
-int
-target_signal_to_host (oursig)
- enum target_signal oursig;
-{
- switch (oursig)
- {
- case TARGET_SIGNAL_0: return 0;
+int child_suppress_run = 0; /* Non-zero if inftarg should pretend not to
+ be a runnable target. Used by targets
+ that can sit atop inftarg, such as HPUX
+ thread support. */
-#if defined (SIGHUP)
- case TARGET_SIGNAL_HUP: return SIGHUP;
-#endif
-#if defined (SIGINT)
- case TARGET_SIGNAL_INT: return SIGINT;
-#endif
-#if defined (SIGQUIT)
- case TARGET_SIGNAL_QUIT: return SIGQUIT;
-#endif
-#if defined (SIGILL)
- case TARGET_SIGNAL_ILL: return SIGILL;
-#endif
-#if defined (SIGTRAP)
- case TARGET_SIGNAL_TRAP: return SIGTRAP;
-#endif
-#if defined (SIGABRT)
- case TARGET_SIGNAL_ABRT: return SIGABRT;
-#endif
-#if defined (SIGEMT)
- case TARGET_SIGNAL_EMT: return SIGEMT;
-#endif
-#if defined (SIGFPE)
- case TARGET_SIGNAL_FPE: return SIGFPE;
-#endif
-#if defined (SIGKILL)
- case TARGET_SIGNAL_KILL: return SIGKILL;
-#endif
-#if defined (SIGBUS)
- case TARGET_SIGNAL_BUS: return SIGBUS;
-#endif
-#if defined (SIGSEGV)
- case TARGET_SIGNAL_SEGV: return SIGSEGV;
-#endif
-#if defined (SIGSYS)
- case TARGET_SIGNAL_SYS: return SIGSYS;
-#endif
-#if defined (SIGPIPE)
- case TARGET_SIGNAL_PIPE: return SIGPIPE;
-#endif
-#if defined (SIGALRM)
- case TARGET_SIGNAL_ALRM: return SIGALRM;
-#endif
-#if defined (SIGTERM)
- case TARGET_SIGNAL_TERM: return SIGTERM;
-#endif
-#if defined (SIGUSR1)
- case TARGET_SIGNAL_USR1: return SIGUSR1;
-#endif
-#if defined (SIGUSR2)
- case TARGET_SIGNAL_USR2: return SIGUSR2;
-#endif
-#if defined (SIGCHLD) || defined (SIGCLD)
- case TARGET_SIGNAL_CHLD:
-#if defined (SIGCHLD)
- return SIGCHLD;
-#else
- return SIGCLD;
-#endif
-#endif /* SIGCLD or SIGCHLD */
-#if defined (SIGPWR)
- case TARGET_SIGNAL_PWR: return SIGPWR;
-#endif
-#if defined (SIGWINCH)
- case TARGET_SIGNAL_WINCH: return SIGWINCH;
-#endif
-#if defined (SIGURG)
- case TARGET_SIGNAL_URG: return SIGURG;
-#endif
-#if defined (SIGIO)
- case TARGET_SIGNAL_IO: return SIGIO;
-#endif
-#if defined (SIGPOLL)
- case TARGET_SIGNAL_POLL: return SIGPOLL;
-#endif
-#if defined (SIGSTOP)
- case TARGET_SIGNAL_STOP: return SIGSTOP;
-#endif
-#if defined (SIGTSTP)
- case TARGET_SIGNAL_TSTP: return SIGTSTP;
-#endif
-#if defined (SIGCONT)
- case TARGET_SIGNAL_CONT: return SIGCONT;
-#endif
-#if defined (SIGTTIN)
- case TARGET_SIGNAL_TTIN: return SIGTTIN;
-#endif
-#if defined (SIGTTOU)
- case TARGET_SIGNAL_TTOU: return SIGTTOU;
-#endif
-#if defined (SIGVTALRM)
- case TARGET_SIGNAL_VTALRM: return SIGVTALRM;
-#endif
-#if defined (SIGPROF)
- case TARGET_SIGNAL_PROF: return SIGPROF;
-#endif
-#if defined (SIGXCPU)
- case TARGET_SIGNAL_XCPU: return SIGXCPU;
-#endif
-#if defined (SIGXFSZ)
- case TARGET_SIGNAL_XFSZ: return SIGXFSZ;
-#endif
-#if defined (SIGWIND)
- case TARGET_SIGNAL_WIND: return SIGWIND;
-#endif
-#if defined (SIGPHONE)
- case TARGET_SIGNAL_PHONE: return SIGPHONE;
-#endif
-#if defined (SIGLOST)
- case TARGET_SIGNAL_LOST: return SIGLOST;
-#endif
-#if defined (SIGWAITING)
- case TARGET_SIGNAL_WAITING: return SIGWAITING;
-#endif
-#if defined (SIGLWP)
- case TARGET_SIGNAL_LWP: return SIGLWP;
-#endif
-#if defined (SIGDANGER)
- case TARGET_SIGNAL_DANGER: return SIGDANGER;
-#endif
-#if defined (SIGGRANT)
- case TARGET_SIGNAL_GRANT: return SIGGRANT;
-#endif
-#if defined (SIGRETRACT)
- case TARGET_SIGNAL_RETRACT: return SIGRETRACT;
-#endif
-#if defined (SIGMSG)
- case TARGET_SIGNAL_MSG: return SIGMSG;
-#endif
-#if defined (SIGSOUND)
- case TARGET_SIGNAL_SOUND: return SIGSOUND;
-#endif
-#if defined (SIGSAK)
- case TARGET_SIGNAL_SAK: return SIGSAK;
-#endif
- default:
- /* The user might be trying to do "signal SIGSAK" where this system
- doesn't have SIGSAK. */
- warning ("Signal %s does not exist on this system.\n",
- target_signal_to_name (oursig));
- return 0;
- }
-}
+#ifndef CHILD_WAIT
-/* Helper function for child_wait and the Lynx derivatives of child_wait.
- HOSTSTATUS is the waitstatus from wait() or the equivalent; store our
- translation of that in OURSTATUS. */
-void
-store_waitstatus (ourstatus, hoststatus)
- struct target_waitstatus *ourstatus;
- int hoststatus;
-{
- if (WIFEXITED (hoststatus))
- {
- ourstatus->kind = TARGET_WAITKIND_EXITED;
- ourstatus->value.integer = WEXITSTATUS (hoststatus);
- }
- else if (!WIFSTOPPED (hoststatus))
- {
- ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
- ourstatus->value.sig = target_signal_from_host (WTERMSIG (hoststatus));
- }
- else
- {
- ourstatus->kind = TARGET_WAITKIND_STOPPED;
- ourstatus->value.sig = target_signal_from_host (WSTOPSIG (hoststatus));
- }
-}
+/*##*/
+/* Enable HACK for ttrace work. In
+ * infttrace.c/require_notification_of_events,
+ * this is set to 0 so that the loop in child_wait
+ * won't loop.
+ */
+int not_same_real_pid = 1;
+/*##*/
-#ifndef CHILD_WAIT
/* Wait for child to do something. Return pid of child, or -1 in case
of error; store status through argument pointer OURSTATUS. */
{
int save_errno;
int status;
+ char * execd_pathname;
+ int exit_status;
+ int related_pid;
+ int syscall_id;
+ enum target_waitkind kind;
do {
- if (attach_flag)
- set_sigint_trap(); /* Causes SIGINT to be passed on to the
- attached process. */
- pid = wait (&status);
+ set_sigint_trap(); /* Causes SIGINT to be passed on to the
+ attached process. */
+ set_sigio_trap ();
+
+ pid = proc_wait (inferior_pid, &status);
+
save_errno = errno;
- if (attach_flag)
- clear_sigint_trap();
+ clear_sigio_trap ();
+
+ clear_sigint_trap();
if (pid == -1)
{
if (save_errno == EINTR)
continue;
+
fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n",
safe_strerror (save_errno));
+
/* Claim it exited with unknown signal. */
ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
return -1;
}
- } while (pid != inferior_pid); /* Some other child died or stopped */
+
+ /* Did it exit?
+ */
+ if (target_has_exited (pid, status, &exit_status))
+ {
+ /* ??rehrauer: For now, ignore this. */
+ continue;
+ }
+
+ if (!target_thread_alive (pid))
+ {
+ ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
+ return pid;
+ }
+
+ if (target_has_forked (pid, &related_pid)
+ && (pid == inferior_pid) || (related_pid == inferior_pid))
+ {
+ ourstatus->kind = TARGET_WAITKIND_FORKED;
+ ourstatus->value.related_pid = related_pid;
+ return pid;
+ }
+
+ if (target_has_vforked (pid, &related_pid)
+ && (pid == inferior_pid) || (related_pid == inferior_pid))
+ {
+ ourstatus->kind = TARGET_WAITKIND_VFORKED;
+ ourstatus->value.related_pid = related_pid;
+ return pid;
+ }
+
+ if (target_has_execd (pid, &execd_pathname))
+ {
+ /* Are we ignoring initial exec events? (This is likely because
+ we're in the process of starting up the inferior, and another
+ (older) mechanism handles those.) If so, we'll report this
+ as a regular stop, not an exec.
+ */
+ if (inferior_ignoring_startup_exec_events)
+ {
+ inferior_ignoring_startup_exec_events--;
+ }
+ else
+ {
+ ourstatus->kind = TARGET_WAITKIND_EXECD;
+ ourstatus->value.execd_pathname = execd_pathname;
+ return pid;
+ }
+ }
+
+ /* All we must do with these is communicate their occurrence
+ to wait_for_inferior...
+ */
+ if (target_has_syscall_event (pid, &kind, &syscall_id))
+ {
+ ourstatus->kind = kind;
+ ourstatus->value.syscall_id = syscall_id;
+ return pid;
+ }
+
+/*## } while (pid != inferior_pid); ##*/ /* Some other child died or stopped */
+/* hack for thread testing */
+ } while( (pid != inferior_pid) && not_same_real_pid );
+/*##*/
+
store_waitstatus (ourstatus, status);
return pid;
}
#endif /* CHILD_WAIT */
-/* Attach to process PID, then initialize for debugging it. */
+#if !defined(CHILD_POST_WAIT)
+void
+child_post_wait (pid, wait_status)
+ int pid;
+ int wait_status;
+{
+ /* This version of Unix doesn't require a meaningful "post wait"
+ operation.
+ */
+}
+#endif
+
+
+#ifndef CHILD_THREAD_ALIVE
+
+/* Check to see if the given thread is alive.
+
+ FIXME: Is kill() ever the right way to do this? I doubt it, but
+ for now we're going to try and be compatable with the old thread
+ code. */
+int
+child_thread_alive (pid)
+ int pid;
+{
+ return (kill (pid, 0) != -1);
+}
+
+#endif
static void
-child_attach (args, from_tty)
- char *args;
- int from_tty;
+child_attach_to_process (args, from_tty, after_fork)
+ char * args;
+ int from_tty;
+ int after_fork;
{
if (!args)
error_no_arg ("process-id to attach");
{
char *exec_file;
int pid;
+ struct target_waitstatus *wstatus;
+ char * dummy;
- pid = atoi (args);
+ dummy = args;
+ pid = strtol (args, &dummy, 0);
+ /* Some targets don't set errno on errors, grrr! */
+ if ((pid == 0) && (args == dummy))
+ error ("Illegal process-id: %s\n", args);
if (pid == getpid()) /* Trying to masturbate? */
error ("I refuse to debug myself!");
{
exec_file = (char *) get_exec_file (0);
- if (exec_file)
- printf_unfiltered ("Attaching to program `%s', %s\n", exec_file,
+ if (after_fork)
+ printf_unfiltered ("Attaching after fork to %s\n",
target_pid_to_str (pid));
- else
- printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid));
+ else if (exec_file)
+ printf_unfiltered ("Attaching to program: %s, %s\n", exec_file,
+ target_pid_to_str (pid));
+ else
+ printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid));
gdb_flush (gdb_stdout);
}
- attach (pid);
+ if (!after_fork)
+ attach (pid);
+ else
+ REQUIRE_ATTACH (pid);
+
inferior_pid = pid;
push_target (&child_ops);
}
}
-/* Take a program previously attached to and detaches it.
- The program resumes execution and will no longer stop
- on signals, etc. We'd better not have left any breakpoints
- in the program or it'll die when it hits one. For this
- to work, it may be necessary for the process to have been
- previously attached. It *might* work if the program was
- started via the normal ptrace (PTRACE_TRACEME). */
+/* Attach to process PID, then initialize for debugging it. */
static void
-child_detach (args, from_tty)
+child_attach (args, from_tty)
char *args;
int from_tty;
+{
+ child_attach_to_process (args, from_tty, 0);
+}
+
+#if !defined(CHILD_POST_ATTACH)
+static void
+child_post_attach (pid)
+ int pid;
+{
+ /* This version of Unix doesn't require a meaningful "post attach"
+ operation by a debugger.
+ */
+}
+#endif
+
+
+static void
+child_require_attach (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ child_attach_to_process (args, from_tty, 1);
+}
+
+static void
+child_detach_from_process (pid, args, from_tty, after_fork)
+ int pid;
+ char * args;
+ int from_tty;
+ int after_fork;
{
#ifdef ATTACH_DETACH
{
char *exec_file = get_exec_file (0);
if (exec_file == 0)
exec_file = "";
- printf_unfiltered ("Detaching from program: %s %s\n", exec_file,
- target_pid_to_str (inferior_pid));
+ if (after_fork)
+ printf_unfiltered ("Detaching after fork from %s\n",
+ target_pid_to_str (pid));
+ else
+ printf_unfiltered ("Detaching from program: %s, %s\n", exec_file,
+ target_pid_to_str (pid));
gdb_flush (gdb_stdout);
}
if (args)
siggnal = atoi (args);
- detach (siggnal);
- inferior_pid = 0;
- unpush_target (&child_ops);
+ if (!after_fork)
+ detach (siggnal);
+ else
+ REQUIRE_DETACH (pid, siggnal);
}
#else
error ("This version of Unix does not support detaching a process.");
#endif
}
+/* Take a program previously attached to and detaches it.
+ The program resumes execution and will no longer stop
+ on signals, etc. We'd better not have left any breakpoints
+ in the program or it'll die when it hits one. For this
+ to work, it may be necessary for the process to have been
+ previously attached. It *might* work if the program was
+ started via the normal ptrace (PTRACE_TRACEME). */
+
+static void
+child_detach (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ child_detach_from_process (inferior_pid, args, from_tty, 0);
+ inferior_pid = 0;
+ unpush_target (&child_ops);
+}
+
+static void
+child_require_detach (pid, args, from_tty)
+ int pid;
+ char * args;
+ int from_tty;
+{
+ child_detach_from_process (pid, args, from_tty, 1);
+}
+
+
/* Get ready to modify the registers array. On machines which store
individual registers, this doesn't need to do anything. On machines
which store all the registers in one fell swoop, this makes sure
/* Stub function which causes the GDB that runs it, to start ptrace-ing
the child process. */
-static void
+static void
ptrace_him (pid)
int pid;
{
push_target (&child_ops);
-#ifdef START_INFERIOR_TRAPS_EXPECTED
+ /* On some targets, there must be some explicit synchronization
+ between the parent and child processes after the debugger
+ forks, and before the child execs the debuggee program. This
+ call basically gives permission for the child to exec.
+ */
+
+ target_acknowledge_created_inferior (pid);
+
+ /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h,
+ * and will be 1 or 2 depending on whether we're starting
+ * without or with a shell.
+ */
startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
-#else
- /* One trap to exec the shell, one to exec the program being debugged. */
- startup_inferior (2);
-#endif
+
+ /* On some targets, there must be some explicit actions taken after
+ the inferior has been started up.
+ */
+ target_post_startup_inferior (pid);
}
/* Start an inferior Unix child process and sets inferior_pid to its pid.
char *allargs;
char **env;
{
- fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him);
+
+#ifdef HPUXHPPA
+ char *tryname;
+ char *shell_file;
+ char *p;
+ char *p1;
+ char *path = getenv ("PATH");
+ int len;
+ struct stat statbuf;
+
+ /* On HP-UX, we have a possible bad interaction between
+ * the start-up-with-shell code and our catch-fork/catch-exec
+ * logic. To avoid the bad interaction, we start up with the
+ * C shell ("csh") and pass it the "-f" flag (fast start-up,
+ * don't run .cshrc code).
+ * See further comments in inferior.h toward the bottom
+ * (STARTUP_WITH_SHELL flag) and in fork-child.c
+ */
+
+ /* Rather than passing in a hard-wired path like "/bin/csh",
+ * we look down the PATH to find csh. I took this code from
+ * procfs.c, which is the file in the Sun-specific part of GDB
+ * analogous to inftarg.c. See procfs.c for more detailed
+ * comments. - RT
+ */
+ shell_file = "csh";
+ 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. I replaced the error() which existed in procfs.c
+ * with simply passing in NULL and hoping fork_inferior()
+ * can deal with it. - RT
+ */
+ /* error ("Can't find shell %s in PATH", shell_file); */
+ shell_file = NULL;
+ else
+ shell_file = tryname;
+
+ fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, pre_fork_inferior, NULL);
+#else
+ fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, NULL, NULL);
+#endif
/* We are at the first instruction we care about. */
/* Pedal to the metal... */
proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
}
+#if !defined(CHILD_POST_STARTUP_INFERIOR)
+void
+child_post_startup_inferior (pid)
+ int pid;
+{
+ /* This version of Unix doesn't require a meaningful "post startup inferior"
+ operation by a debugger.
+ */
+}
+#endif
+
+#if !defined(CHILD_ACKNOWLEDGE_CREATED_INFERIOR)
+void
+child_acknowledge_created_inferior (pid)
+ int pid;
+{
+ /* This version of Unix doesn't require a meaningful "acknowledge created inferior"
+ operation by a debugger.
+ */
+}
+#endif
+
+
+void
+child_clone_and_follow_inferior (child_pid, followed_child)
+ int child_pid;
+ int *followed_child;
+{
+ clone_and_follow_inferior (child_pid, followed_child);
+
+ /* Don't resume CHILD_PID; it's stopped where it ought to be, until
+ the decision gets made elsewhere how to continue it.
+ */
+}
+
+
+#if !defined(CHILD_POST_FOLLOW_INFERIOR_BY_CLONE)
+void
+child_post_follow_inferior_by_clone ()
+{
+ /* This version of Unix doesn't require a meaningful "post follow inferior"
+ operation by a clone debugger.
+ */
+}
+#endif
+
+
+#if !defined(CHILD_INSERT_FORK_CATCHPOINT)
+int
+child_insert_fork_catchpoint (pid)
+ int pid;
+{
+ /* This version of Unix doesn't support notification of fork events.
+ */
+}
+#endif
+
+
+#if !defined(CHILD_REMOVE_FORK_CATCHPOINT)
+int
+child_remove_fork_catchpoint (pid)
+ int pid;
+{
+ /* This version of Unix doesn't support notification of fork events.
+ */
+}
+#endif
+
+
+#if !defined(CHILD_INSERT_VFORK_CATCHPOINT)
+int
+child_insert_vfork_catchpoint (pid)
+ int pid;
+{
+ /* This version of Unix doesn't support notification of vfork events.
+ */
+}
+#endif
+
+
+#if !defined(CHILD_REMOVE_VFORK_CATCHPOINT)
+int
+child_remove_vfork_catchpoint (pid)
+ int pid;
+{
+ /* This version of Unix doesn't support notification of vfork events.
+ */
+}
+#endif
+
+
+#if !defined(CHILD_HAS_FORKED)
+int
+child_has_forked (pid, child_pid)
+ int pid;
+ int * child_pid;
+{
+ /* This version of Unix doesn't support notification of fork events.
+ */
+ return 0;
+}
+#endif
+
+
+#if !defined(CHILD_HAS_VFORKED)
+int
+child_has_vforked (pid, child_pid)
+ int pid;
+ int * child_pid;
+{
+ /* This version of Unix doesn't support notification of vfork events.
+ */
+ return 0;
+}
+#endif
+
+
+#if !defined(CHILD_CAN_FOLLOW_VFORK_PRIOR_TO_EXEC)
+int
+child_can_follow_vfork_prior_to_exec ()
+{
+ /* This version of Unix doesn't support notification of vfork events.
+ However, if it did, it probably wouldn't allow vforks to be followed
+ before the following exec.
+ */
+ return 0;
+}
+#endif
+
+
+#if !defined(CHILD_POST_FOLLOW_VFORK)
+void
+child_post_follow_vfork (parent_pid, followed_parent, child_pid, followed_child)
+ int parent_pid;
+ int followed_parent;
+ int child_pid;
+ int followed_child;
+{
+ /* This version of Unix doesn't require a meaningful "post follow vfork"
+ operation by a clone debugger.
+ */
+}
+#endif
+
+#if !defined(CHILD_INSERT_EXEC_CATCHPOINT)
+int
+child_insert_exec_catchpoint (pid)
+ int pid;
+{
+ /* This version of Unix doesn't support notification of exec events.
+ */
+}
+#endif
+
+
+#if !defined(CHILD_REMOVE_EXEC_CATCHPOINT)
+int
+child_remove_exec_catchpoint (pid)
+ int pid;
+{
+ /* This version of Unix doesn't support notification of exec events.
+ */
+}
+#endif
+
+
+#if !defined(CHILD_HAS_EXECD)
+int
+child_has_execd (pid, execd_pathname)
+ int pid;
+ char ** execd_pathname;
+{
+ /* This version of Unix doesn't support notification of exec events.
+ */
+ return 0;
+}
+#endif
+
+
+#if !defined(CHILD_REPORTED_EXEC_EVENTS_PER_EXEC_CALL)
+int
+child_reported_exec_events_per_exec_call ()
+{
+ /* This version of Unix doesn't support notification of exec events.
+ */
+ return 1;
+}
+#endif
+
+
+#if !defined(CHILD_HAS_SYSCALL_EVENT)
+int
+child_has_syscall_event (pid, kind, syscall_id)
+ int pid;
+ enum target_waitkind * kind;
+ int * syscall_id;
+{
+ /* This version of Unix doesn't support notification of syscall events.
+ */
+ return 0;
+}
+#endif
+
+
+#if !defined(CHILD_HAS_EXITED)
+int
+child_has_exited (pid, wait_status, exit_status)
+ int pid;
+ int wait_status;
+ int * exit_status;
+{
+ if (WIFEXITED (wait_status))
+ {
+ *exit_status = WEXITSTATUS (wait_status);
+ return 1;
+ }
+
+ if (WIFSIGNALED (wait_status))
+ {
+ *exit_status = 0; /* ?? Don't know what else to say here. */
+ return 1;
+ }
+
+ /* ?? Do we really need to consult the event state, too? Assume the
+ wait_state alone suffices.
+ */
+ return 0;
+}
+#endif
+
+
static void
child_mourn_inferior ()
{
+ /* FIXME: Should be in a header file */
+ extern void proc_remove_foreign PARAMS ((int));
+
unpush_target (&child_ops);
+ proc_remove_foreign (inferior_pid);
generic_mourn_inferior ();
}
static int
child_can_run ()
{
- return(1);
+ /* This variable is controlled by modules that sit atop inftarg that may layer
+ their own process structure atop that provided here. hpux-thread.c does
+ this because of the Hpux user-mode level thread model. */
+
+ return !child_suppress_run;
+}
+
+/* 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
+child_stop ()
+{
+ extern pid_t inferior_process_group;
+
+ kill (-inferior_process_group, SIGINT);
+}
+
+#if !defined(CHILD_ENABLE_EXCEPTION_CALLBACK)
+struct symtab_and_line *
+child_enable_exception_callback (kind, enable)
+ enum exception_event_kind kind;
+ int enable;
+{
+ return (struct symtab_and_line *) NULL;
+}
+#endif
+
+#if !defined(CHILD_GET_CURRENT_EXCEPTION_EVENT)
+struct exception_event_record *
+child_get_current_exception_event ()
+{
+ return (struct exception_event_record *) NULL;
+}
+#endif
+
+
+#if !defined(CHILD_PID_TO_EXEC_FILE)
+char *
+child_pid_to_exec_file (pid)
+ int pid;
+{
+ /* This version of Unix doesn't support translation of a process ID
+ to the filename of the executable file.
+ */
+ return NULL;
}
+#endif
+
+char *
+child_core_file_to_sym_file (core)
+ char * core;
+{
+ /* The target stratum for a running executable need not support
+ this operation.
+ */
+ return NULL;
+}
+
+
\f
struct target_ops child_ops = {
"child", /* to_shortname */
child_open, /* to_open */
0, /* to_close */
child_attach, /* to_attach */
+ child_post_attach, /* to_post_attach */
+ child_require_attach, /* to_require_attach */
child_detach, /* to_detach */
+ child_require_detach, /* to_require_detach */
child_resume, /* to_resume */
child_wait, /* to_wait */
+ child_post_wait, /* to_post_wait */
fetch_inferior_registers, /* to_fetch_registers */
store_inferior_registers, /* to_store_registers */
child_prepare_to_store, /* to_prepare_to_store */
0, /* to_load */
0, /* to_lookup_symbol */
child_create_inferior, /* to_create_inferior */
+ child_post_startup_inferior, /* to_post_startup_inferior */
+ child_acknowledge_created_inferior, /* to_acknowledge_created_inferior */
+ child_clone_and_follow_inferior, /* to_clone_and_follow_inferior */
+ child_post_follow_inferior_by_clone, /* to_post_follow_inferior_by_clone */
+ child_insert_fork_catchpoint, /* to_insert_fork_catchpoint */
+ child_remove_fork_catchpoint, /* to_remove_fork_catchpoint */
+ child_insert_vfork_catchpoint, /* to_insert_vfork_catchpoint */
+ child_remove_vfork_catchpoint, /* to_remove_vfork_catchpoint */
+ child_has_forked, /* to_has_forked */
+ child_has_vforked, /* to_has_vforked */
+ child_can_follow_vfork_prior_to_exec, /* to_can_follow_vfork_prior_to_exec */
+ child_post_follow_vfork, /* to_post_follow_vfork */
+ child_insert_exec_catchpoint, /* to_insert_exec_catchpoint */
+ child_remove_exec_catchpoint, /* to_remove_exec_catchpoint */
+ child_has_execd, /* to_has_execd */
+ child_reported_exec_events_per_exec_call, /* to_reported_exec_events_per_exec_call */
+ child_has_syscall_event, /* to_has_syscall_event */
+ child_has_exited, /* to_has_exited */
child_mourn_inferior, /* to_mourn_inferior */
child_can_run, /* to_can_run */
0, /* to_notice_signals */
+ child_thread_alive, /* to_thread_alive */
+ child_stop, /* to_stop */
+ child_enable_exception_callback, /* to_enable_exception_callback */
+ child_get_current_exception_event, /* to_get_current_exception_event */
+ child_pid_to_exec_file, /* to_pid_to_exec_file */
+ child_core_file_to_sym_file, /* to_core_file_to_sym_file */
process_stratum, /* to_stratum */
0, /* to_next */
1, /* to_has_all_memory */
1, /* to_has_stack */
1, /* to_has_registers */
1, /* to_has_execution */
- 0, /* sections */
- 0, /* sections_end */
+ 0, /* to_sections */
+ 0, /* to_sections_end */
OPS_MAGIC /* to_magic */
};
void
_initialize_inftarg ()
{
+#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 ptrace support if we can access the running GDB via /proc. */
+#ifndef PROC_NAME_FMT
+#define PROC_NAME_FMT "/proc/%05d"
+#endif
+ sprintf (procname, PROC_NAME_FMT, getpid ());
+ if ((fd = open (procname, O_RDONLY)) >= 0)
+ {
+ close (fd);
+ return;
+ }
+#endif
+
add_target (&child_ops);
}
projects / deliverable / binutils-gdb.git / blobdiff