Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 968 insertions, 0 deletions

diff --git a/gdb/inftarg.c b/gdb/inftarg.c
new file mode 100644
index 0000000..af5cd3d
--- /dev/null
+++ b/gdb/inftarg.c
@@ -0,0 +1,968 @@
+/* Target-vector operations for controlling Unix child processes, for GDB.
+   Copyright 1990-1996, 1998, 1999 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
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+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., 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 "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));
+
+extern void _initialize_inftarg PARAMS ((void));
+
+static void
+child_prepare_to_store PARAMS ((void));
+
+#ifndef CHILD_WAIT
+static int child_wait PARAMS ((int, struct target_waitstatus *));
+#endif /* CHILD_WAIT */
+
+#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)
+extern 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
+
+static void init_child_ops PARAMS ((void));
+
+extern char **environ;
+
+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 OURSTATUS.  */
+
+static int
+child_wait (pid, ourstatus)
+     int pid;
+     struct target_waitstatus *ourstatus;
+{
+  int save_errno;
+  int status;
+  char *  execd_pathname;
+  int  exit_status;
+  int  related_pid;
+  int  syscall_id;
+  enum target_waitkind  kind;
+
+  do {
+    set_sigint_trap();	/* Causes SIGINT to be passed on to the
+			   attached process. */
+    set_sigio_trap ();
+
+    pid = ptrace_wait (inferior_pid, &status);
+
+    save_errno = errno;
+
+    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;
+      }
+
+    /* 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
+ 
+
+#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_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
+  {
+    char *exec_file;
+    int pid;
+    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 (!after_fork)
+      attach (pid);
+    else
+      REQUIRE_ATTACH (pid);
+
+    inferior_pid = pid;
+    push_target (&child_ops);
+  }
+#endif  /* ATTACH_DETACH */
+}
+
+
+/* Attach to process PID, then initialize for debugging it.  */
+
+static void
+child_attach (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  child_attach_to_process (args, from_tty, 0);
+}
+
+#if !defined(CHILD_POST_ATTACH)
+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
+  {
+    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.");
+#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
+   that registers contains all the registers from the program being
+   debugged.  */
+
+static void
+child_prepare_to_store ()
+{
+#ifdef CHILD_PREPARE_TO_STORE
+  CHILD_PREPARE_TO_STORE ();
+#endif
+}
+
+/* Print status information about what we're accessing.  */
+
+static void
+child_files_info (ignore)
+     struct target_ops *ignore;
+{
+  printf_unfiltered ("\tUsing the running image of %s %s.\n",
+	  attach_flag? "attached": "child", target_pid_to_str (inferior_pid));
+}
+
+/* ARGSUSED */
+static void
+child_open (arg, from_tty)
+     char *arg;
+     int from_tty;
+{
+  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().  */
+
+static void
+child_create_inferior (exec_file, allargs, env)
+     char *exec_file;
+     char *allargs;
+     char **env;
+{
+
+#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.  */
+  return 0;
+}
+#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.  */
+  return 0;
+}
+#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.  */
+  return 0;
+}
+#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.  */
+  return 0;
+}
+#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.  */
+  return 0;
+}
+#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.  */
+  return 0;
+}
+#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 ()
+{
+  /* 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;
+}
+
+
+
+static void
+init_child_ops ()
+{
+  child_ops.to_shortname = "child";
+  child_ops.to_longname = "Unix child process";
+  child_ops.to_doc = "Unix child process (started by the \"run\" command).";
+  child_ops.to_open = child_open;
+  child_ops.to_attach = child_attach;
+  child_ops.to_post_attach = child_post_attach;
+  child_ops.to_require_attach = child_require_attach;
+  child_ops.to_detach = child_detach;
+  child_ops.to_require_detach = child_require_detach;
+  child_ops.to_resume = child_resume;
+  child_ops.to_wait = child_wait;
+  child_ops.to_post_wait = child_post_wait;
+  child_ops.to_fetch_registers = fetch_inferior_registers;
+  child_ops.to_store_registers = store_inferior_registers;
+  child_ops.to_prepare_to_store = child_prepare_to_store;
+  child_ops.to_xfer_memory = child_xfer_memory;
+  child_ops.to_files_info = child_files_info;
+  child_ops.to_insert_breakpoint = memory_insert_breakpoint;
+  child_ops.to_remove_breakpoint = memory_remove_breakpoint;
+  child_ops.to_terminal_init = terminal_init_inferior;
+  child_ops.to_terminal_inferior = terminal_inferior;
+  child_ops.to_terminal_ours_for_output = terminal_ours_for_output;
+  child_ops.to_terminal_ours = terminal_ours;
+  child_ops.to_terminal_info = child_terminal_info;
+  child_ops.to_kill = kill_inferior;
+  child_ops.to_create_inferior = child_create_inferior;
+  child_ops.to_post_startup_inferior = child_post_startup_inferior;
+  child_ops.to_acknowledge_created_inferior = child_acknowledge_created_inferior;
+  child_ops.to_clone_and_follow_inferior = child_clone_and_follow_inferior;
+  child_ops.to_post_follow_inferior_by_clone = child_post_follow_inferior_by_clone;
+  child_ops.to_insert_fork_catchpoint = child_insert_fork_catchpoint;
+  child_ops.to_remove_fork_catchpoint = child_remove_fork_catchpoint;
+  child_ops.to_insert_vfork_catchpoint = child_insert_vfork_catchpoint;
+  child_ops.to_remove_vfork_catchpoint = child_remove_vfork_catchpoint;
+  child_ops.to_has_forked = child_has_forked;
+  child_ops.to_has_vforked = child_has_vforked;
+  child_ops.to_can_follow_vfork_prior_to_exec = child_can_follow_vfork_prior_to_exec;
+  child_ops.to_post_follow_vfork = child_post_follow_vfork;
+  child_ops.to_insert_exec_catchpoint = child_insert_exec_catchpoint;
+  child_ops.to_remove_exec_catchpoint = child_remove_exec_catchpoint;
+  child_ops.to_has_execd = child_has_execd;
+  child_ops.to_reported_exec_events_per_exec_call = child_reported_exec_events_per_exec_call;
+  child_ops.to_has_syscall_event = child_has_syscall_event;
+  child_ops.to_has_exited = child_has_exited;
+  child_ops.to_mourn_inferior = child_mourn_inferior;
+  child_ops.to_can_run = child_can_run;
+  child_ops.to_thread_alive = child_thread_alive;
+  child_ops.to_stop = child_stop;
+  child_ops.to_enable_exception_callback = child_enable_exception_callback;
+  child_ops.to_get_current_exception_event = child_get_current_exception_event;
+  child_ops.to_pid_to_exec_file = child_pid_to_exec_file;
+  child_ops.to_core_file_to_sym_file = child_core_file_to_sym_file;
+  child_ops.to_stratum = process_stratum;
+  child_ops.to_has_all_memory = 1;
+  child_ops.to_has_memory = 1;
+  child_ops.to_has_stack = 1;
+  child_ops.to_has_registers = 1;
+  child_ops.to_has_execution = 1;
+  child_ops.to_magic = OPS_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
+
+  init_child_ops ();
+  add_target (&child_ops);
+}