-/* This file inplements the host independent child process statum.
-
- Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
+/* Target-vector operations for controlling Unix child processes, for GDB.
+ 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 "ieee-float.h" /* Required by REGISTER_CONVERT_TO_XXX */
-#include "terminal.h" /* For #ifdef TIOCGPGRP and new_tty */
-
+#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
-#ifdef SET_STACK_LIMIT_HUGE
-#include <sys/time.h>
-#include <sys/resource.h>
+extern struct symtab_and_line *
+child_enable_exception_callback PARAMS ((enum exception_event_kind, int));
-extern int original_stack_limit;
-#endif /* SET_STACK_LIMIT_HUGE */
+extern struct exception_event_record *
+child_get_current_exception_event PARAMS ((void));
static void
child_prepare_to_store PARAMS ((void));
-static int
-child_wait PARAMS ((int *));
+#ifndef CHILD_WAIT
+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
+child_attach_to_process PARAMS ((char *, int, int));
+
+#if !defined(CHILD_POST_ATTACH)
+static void
+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
child_mourn_inferior PARAMS ((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;
+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. */
+
+#ifndef CHILD_WAIT
+
+/*##*/
+/* 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;
+/*##*/
+
+
/* Wait for child to do something. Return pid of child, or -1 in case
- of error; store status through argument pointer STATUS. */
+ of error; store status through argument pointer OURSTATUS. */
static int
-child_wait (status)
- int *status;
+child_wait (pid, ourstatus)
+ int pid;
+ struct target_waitstatus *ourstatus;
{
- int pid;
+ int save_errno;
+ int status;
+ char * execd_pathname;
+ int exit_status;
+ int related_pid;
+ int syscall_id;
+ enum target_waitkind kind;
do {
-#ifdef USE_PROC_FS
- pid = proc_wait (status);
-#else
- pid = wait (status);
-#endif
- if (pid == -1) /* No more children to wait for */
+ 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;
+
+ clear_sigio_trap ();
+
+ clear_sigint_trap();
+
+ if (pid == -1)
{
- fprintf (stderr, "Child process unexpectedly missing.\n");
- *status = 42; /* Claim it exited with signal 42 */
+ 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 */
+#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
+
-/* Attach to process PID, then initialize for debugging it
- and wait for the trace-trap that results from attaching. */
+#ifndef CHILD_THREAD_ALIVE
-static void
-child_attach (args, from_tty)
- char *args;
- int from_tty;
+/* 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;
{
- char *exec_file;
- int pid;
+ return (kill (pid, 0) != -1);
+}
- dont_repeat();
+#endif
+static void
+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");
#ifndef ATTACH_DETACH
error ("Can't attach to a process on this machine.");
#else
- pid = atoi (args);
-
- if (pid == getpid()) /* Trying to masturbate? */
- error ("I refuse to debug myself!");
+ {
+ char *exec_file;
+ int pid;
+ struct target_waitstatus *wstatus;
+ char * dummy;
+
+ 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!");
+
+ if (from_tty)
+ {
+ exec_file = (char *) get_exec_file (0);
+
+ if (after_fork)
+ printf_unfiltered ("Attaching after fork 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);
+ }
- if (target_has_execution)
- {
- if (query ("A program is being debugged already. Kill it? "))
- target_kill ();
- else
- error ("Inferior not killed.");
- }
+ if (!after_fork)
+ attach (pid);
+ else
+ REQUIRE_ATTACH (pid);
- if (from_tty)
- {
- exec_file = (char *) get_exec_file (0);
+ inferior_pid = pid;
+ push_target (&child_ops);
+ }
+#endif /* ATTACH_DETACH */
+}
- if (exec_file)
- printf ("Attaching program `%s', pid %d\n", exec_file, pid);
- else
- printf ("Attaching pid %d\n", pid);
- fflush (stdout);
- }
+/* Attach to process PID, then initialize for debugging it. */
- attach (pid);
- inferior_pid = pid;
- push_target (&child_ops);
+static void
+child_attach (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ child_attach_to_process (args, from_tty, 0);
+}
- mark_breakpoints_out ();
- target_terminal_init ();
- clear_proceed_status ();
- stop_soon_quietly = 1;
- /*proceed (-1, 0, -2);*/
- target_terminal_inferior ();
- wait_for_inferior ();
-#ifdef SOLIB_ADD
- SOLIB_ADD ((char *)0, from_tty, (struct target_ops *)0);
-#endif
- normal_stop ();
-#endif /* ATTACH_DETACH */
+#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
-/*
- * child_detach()
- * takes a program previously attached to and detaches it.
- * The program resumes execution and will no longer stop
- * on signals, etc. We 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)
+child_require_attach (args, from_tty)
char *args;
int from_tty;
{
- int siggnal = 0;
+ 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
- if (from_tty)
- {
- 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);
- }
- if (args)
- siggnal = atoi (args);
-
- detach (siggnal);
- inferior_pid = 0;
- unpush_target (&child_ops); /* Pop out of handling an inferior */
+ {
+ int siggnal = 0;
+
+ if (from_tty)
+ {
+ char *exec_file = get_exec_file (0);
+ if (exec_file == 0)
+ exec_file = "";
+ 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);
+
+ if (!after_fork)
+ detach (siggnal);
+ else
+ REQUIRE_DETACH (pid, siggnal);
+ }
#else
- error ("This version of Unix does not support detaching a process.");
+ 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
child_files_info (ignore)
struct target_ops *ignore;
{
- printf ("\tUsing the running image of %s process %d.\n",
- attach_flag? "attached": "child", inferior_pid);
+ printf_unfiltered ("\tUsing the running image of %s %s.\n",
+ attach_flag? "attached": "child", target_pid_to_str (inferior_pid));
}
/* ARGSUSED */
error ("Use the \"run\" command to start a Unix child process.");
}
+/* Stub function which causes the inferior that runs it, to be ptrace-able
+ by its parent process. */
+
+static void
+ptrace_me ()
+{
+ /* "Trace me, Dr. Memory!" */
+ call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0);
+}
+
+/* Stub function which causes the GDB that runs it, to start ptrace-ing
+ the child process. */
+
+static void
+ptrace_him (pid)
+ int pid;
+{
+ push_target (&child_ops);
+
+ /* 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);
+
+ /* 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.
EXEC_FILE is the file to run.
ALLARGS is a string containing the arguments to the program.
ENV is the environment vector to pass. Errors reported with error(). */
-#ifndef SHELL_FILE
-#define SHELL_FILE "/bin/sh"
-#endif
-
static void
child_create_inferior (exec_file, allargs, env)
char *exec_file;
char *allargs;
char **env;
{
- int pid;
- char *shell_command;
+
+#ifdef HPUXHPPA
+ char *tryname;
char *shell_file;
- static char default_shell_file[] = SHELL_FILE;
+ char *p;
+ char *p1;
+ char *path = getenv ("PATH");
int len;
- int pending_execs;
- /* Set debug_fork then attach to the child while it sleeps, to debug. */
- static int debug_fork = 0;
- /* This is set to the result of setpgrp, which if vforked, will be visible
- to you in the parent process. It's only used by humans for debugging. */
- static int debug_setpgrp = 657473;
- char **save_our_env;
-
- /* If no exec file handed to us, get it from the exec-file command -- with
- a good, common error message if none is specified. */
- if (exec_file == 0)
- exec_file = get_exec_file(1);
-
- /* The user might want tilde-expansion, and in general probably wants
- the program to behave the same way as if run from
- his/her favorite shell. So we let the shell run it for us.
- FIXME, this should probably search the local environment (as
- modified by the setenv command), not the env gdb inherited. */
- shell_file = getenv ("SHELL");
- if (shell_file == NULL)
- shell_file = default_shell_file;
-
- len = 5 + strlen (exec_file) + 1 + strlen (allargs) + 1 + /*slop*/ 10;
- /* If desired, concat something onto the front of ALLARGS.
- SHELL_COMMAND is the result. */
-#ifdef SHELL_COMMAND_CONCAT
- shell_command = (char *) alloca (strlen (SHELL_COMMAND_CONCAT) + len);
- strcpy (shell_command, SHELL_COMMAND_CONCAT);
+ 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
- shell_command = (char *) alloca (len);
- shell_command[0] = '\0';
+ fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, NULL, NULL);
#endif
- strcat (shell_command, "exec ");
- strcat (shell_command, exec_file);
- strcat (shell_command, " ");
- strcat (shell_command, allargs);
+ /* We are at the first instruction we care about. */
+ /* Pedal to the metal... */
+ proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
+}
- /* exec is said to fail if the executable is open. */
- close_exec_file ();
+#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
- /* Retain a copy of our environment variables, since the child will
- replace the value of environ and if we're vforked, we have to
- restore it. */
- save_our_env = environ;
+#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
- /* Tell the terminal handling subsystem what tty we plan to run on;
- it will just record the information for later. */
- new_tty_prefork (inferior_io_terminal);
+void
+child_clone_and_follow_inferior (child_pid, followed_child)
+ int child_pid;
+ int *followed_child;
+{
+ clone_and_follow_inferior (child_pid, followed_child);
- /* It is generally good practice to flush any possible pending stdio
- output prior to doing a fork, to avoid the possibility of both the
- parent and child flushing the same data after the fork. */
+ /* Don't resume CHILD_PID; it's stopped where it ought to be, until
+ the decision gets made elsewhere how to continue it.
+ */
+}
- fflush (stdout);
- fflush (stderr);
-#if defined(USG) && !defined(HAVE_VFORK)
- pid = fork ();
-#else
- if (debug_fork)
- pid = fork ();
- else
- pid = vfork ();
+#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 (pid < 0)
- perror_with_name ("vfork");
- if (pid == 0)
- {
- if (debug_fork)
- sleep (debug_fork);
+#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
-#ifdef TIOCGPGRP
- /* Run inferior in a separate process group. */
-#ifdef NEED_POSIX_SETPGID
- debug_setpgrp = setpgid (0, 0);
-#else
-#if defined(USG) && !defined(SETPGRP_ARGS)
- debug_setpgrp = setpgrp ();
-#else
- debug_setpgrp = setpgrp (getpid (), getpid ());
-#endif /* USG */
-#endif /* NEED_POSIX_SETPGID */
- if (debug_setpgrp == -1)
- perror("setpgrp failed in child");
-#endif /* TIOCGPGRP */
-
-#ifdef SET_STACK_LIMIT_HUGE
- /* Reset the stack limit back to what it was. */
- {
- struct rlimit rlim;
- getrlimit (RLIMIT_STACK, &rlim);
- rlim.rlim_cur = original_stack_limit;
- setrlimit (RLIMIT_STACK, &rlim);
- }
-#endif /* SET_STACK_LIMIT_HUGE */
+#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
- /* Ask the tty subsystem to switch to the one we specified earlier
- (or to share the current terminal, if none was specified). */
- new_tty ();
+#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
- /* Changing the signal handlers for the inferior after
- a vfork can also change them for the superior, so we don't mess
- with signals here. See comments in
- initialize_signals for how we get the right signal handlers
- for the inferior. */
-#ifdef USE_PROC_FS
- /* Use SVR4 /proc interface */
- proc_set_exec_trap ();
-#else
- /* "Trace me, Dr. Memory!" */
- call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0);
-#endif
-
- /* There is no execlpe call, so we have to set the environment
- for our child in the global variable. If we've vforked, this
- clobbers the parent, but environ is restored a few lines down
- in the parent. By the way, yes we do need to look down the
- path to find $SHELL. Rich Pixley says so, and I agree. */
- environ = env;
- execlp (shell_file, shell_file, "-c", shell_command, (char *)0);
-
- fprintf (stderr, "Cannot exec %s: %s.\n", shell_file,
- safe_strerror (errno));
- fflush (stderr);
- _exit (0177);
- }
+#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
- /* Restore our environment in case a vforked child clob'd it. */
- environ = save_our_env;
- /* Now that we have a child process, make it our target. */
- push_target (&child_ops);
+#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
-#ifdef CREATE_INFERIOR_HOOK
- CREATE_INFERIOR_HOOK (pid);
-#endif
-/* The process was started by the fork that created it,
- but it will have stopped one instruction after execing the shell.
- Here we must get it up to actual execution of the real program. */
+#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
- inferior_pid = pid; /* Needed for wait_for_inferior stuff below */
- clear_proceed_status ();
+#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
- /* We will get a trace trap after one instruction.
- Continue it automatically. Eventually (after shell does an exec)
- it will get another trace trap. Then insert breakpoints and continue. */
-#ifdef START_INFERIOR_TRAPS_EXPECTED
- pending_execs = START_INFERIOR_TRAPS_EXPECTED;
-#else
- pending_execs = 2;
+#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
- init_wait_for_inferior ();
- /* Set up the "saved terminal modes" of the inferior
- based on what modes we are starting it with. */
- target_terminal_init ();
+#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
+
- /* Install inferior's terminal modes. */
- target_terminal_inferior ();
+#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;
+ }
- while (1)
+ if (WIFSIGNALED (wait_status))
{
- stop_soon_quietly = 1; /* Make wait_for_inferior be quiet */
- wait_for_inferior ();
- if (stop_signal != SIGTRAP)
- {
- /* Let shell child handle its own signals in its own way */
- /* FIXME, what if child has exit()ed? Must exit loop somehow */
- resume (0, stop_signal);
- }
- else
- {
- /* We handle SIGTRAP, however; it means child did an exec. */
- if (0 == --pending_execs)
- break;
- resume (0, 0); /* Just make it go on */
- }
+ *exit_status = 0; /* ?? Don't know what else to say here. */
+ return 1;
}
- stop_soon_quietly = 0;
- /* We are now in the child process of interest, having exec'd the
- correct program, and are poised at the first instruction of the
- new program. */
-#ifdef SOLIB_CREATE_INFERIOR_HOOK
- SOLIB_CREATE_INFERIOR_HOOK (pid);
+ /* ?? Do we really need to consult the event state, too? Assume the
+ wait_state alone suffices.
+ */
+ return 0;
+}
#endif
- /* Pedal to the metal. Away we go. */
- proceed ((CORE_ADDR) -1, 0, 0);
-}
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 */
"Unix child process", /* to_longname */
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