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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [gdb/] [fork-child.c] - Diff between revs 227 and 816

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/* Fork a Unix child process, and set up to debug it, for GDB.
/* Fork a Unix child process, and set up to debug it, for GDB.
 
 
   Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000,
   Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000,
   2001, 2004, 2005, 2006, 2007, 2008, 2009, 2010
   2001, 2004, 2005, 2006, 2007, 2008, 2009, 2010
   Free Software Foundation, Inc.
   Free Software Foundation, Inc.
 
 
   Contributed by Cygnus Support.
   Contributed by Cygnus Support.
 
 
   This file is part of GDB.
   This file is part of GDB.
 
 
   This program is free software; you can redistribute it and/or modify
   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
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   (at your option) any later version.
 
 
   This program is distributed in the hope that it will be useful,
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   GNU General Public License for more details.
 
 
   You should have received a copy of the GNU General Public License
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 
#include "defs.h"
#include "defs.h"
#include "gdb_string.h"
#include "gdb_string.h"
#include "inferior.h"
#include "inferior.h"
#include "terminal.h"
#include "terminal.h"
#include "target.h"
#include "target.h"
#include "gdb_wait.h"
#include "gdb_wait.h"
#include "gdb_vfork.h"
#include "gdb_vfork.h"
#include "gdbcore.h"
#include "gdbcore.h"
#include "terminal.h"
#include "terminal.h"
#include "gdbthread.h"
#include "gdbthread.h"
#include "command.h" /* for dont_repeat () */
#include "command.h" /* for dont_repeat () */
#include "gdbcmd.h"
#include "gdbcmd.h"
#include "solib.h"
#include "solib.h"
 
 
#include <signal.h>
#include <signal.h>
 
 
/* This just gets used as a default if we can't find SHELL.  */
/* This just gets used as a default if we can't find SHELL.  */
#define SHELL_FILE "/bin/sh"
#define SHELL_FILE "/bin/sh"
 
 
extern char **environ;
extern char **environ;
 
 
static char *exec_wrapper;
static char *exec_wrapper;
 
 
/* Break up SCRATCH into an argument vector suitable for passing to
/* Break up SCRATCH into an argument vector suitable for passing to
   execvp and store it in ARGV.  E.g., on "run a b c d" this routine
   execvp and store it in ARGV.  E.g., on "run a b c d" this routine
   would get as input the string "a b c d", and as output it would
   would get as input the string "a b c d", and as output it would
   fill in ARGV with the four arguments "a", "b", "c", "d".  */
   fill in ARGV with the four arguments "a", "b", "c", "d".  */
 
 
static void
static void
breakup_args (char *scratch, char **argv)
breakup_args (char *scratch, char **argv)
{
{
  char *cp = scratch;
  char *cp = scratch;
 
 
  for (;;)
  for (;;)
    {
    {
      /* Scan past leading separators */
      /* Scan past leading separators */
      while (*cp == ' ' || *cp == '\t' || *cp == '\n')
      while (*cp == ' ' || *cp == '\t' || *cp == '\n')
        cp++;
        cp++;
 
 
      /* Break if at end of string.  */
      /* Break if at end of string.  */
      if (*cp == '\0')
      if (*cp == '\0')
        break;
        break;
 
 
      /* Take an arg.  */
      /* Take an arg.  */
      *argv++ = cp;
      *argv++ = cp;
 
 
      /* Scan for next arg separator.  */
      /* Scan for next arg separator.  */
      cp = strchr (cp, ' ');
      cp = strchr (cp, ' ');
      if (cp == NULL)
      if (cp == NULL)
        cp = strchr (cp, '\t');
        cp = strchr (cp, '\t');
      if (cp == NULL)
      if (cp == NULL)
        cp = strchr (cp, '\n');
        cp = strchr (cp, '\n');
 
 
      /* No separators => end of string => break.  */
      /* No separators => end of string => break.  */
      if (cp == NULL)
      if (cp == NULL)
        break;
        break;
 
 
      /* Replace the separator with a terminator.  */
      /* Replace the separator with a terminator.  */
      *cp++ = '\0';
      *cp++ = '\0';
    }
    }
 
 
  /* Null-terminate the vector.  */
  /* Null-terminate the vector.  */
  *argv = NULL;
  *argv = NULL;
}
}
 
 
/* When executing a command under the given shell, return non-zero if
/* When executing a command under the given shell, return non-zero if
   the '!' character should be escaped when embedded in a quoted
   the '!' character should be escaped when embedded in a quoted
   command-line argument.  */
   command-line argument.  */
 
 
static int
static int
escape_bang_in_quoted_argument (const char *shell_file)
escape_bang_in_quoted_argument (const char *shell_file)
{
{
  const int shell_file_len = strlen (shell_file);
  const int shell_file_len = strlen (shell_file);
 
 
  /* Bang should be escaped only in C Shells.  For now, simply check
  /* Bang should be escaped only in C Shells.  For now, simply check
     that the shell name ends with 'csh', which covers at least csh
     that the shell name ends with 'csh', which covers at least csh
     and tcsh.  This should be good enough for now.  */
     and tcsh.  This should be good enough for now.  */
 
 
  if (shell_file_len < 3)
  if (shell_file_len < 3)
    return 0;
    return 0;
 
 
  if (shell_file[shell_file_len - 3] == 'c'
  if (shell_file[shell_file_len - 3] == 'c'
      && shell_file[shell_file_len - 2] == 's'
      && shell_file[shell_file_len - 2] == 's'
      && shell_file[shell_file_len - 1] == 'h')
      && shell_file[shell_file_len - 1] == 'h')
    return 1;
    return 1;
 
 
  return 0;
  return 0;
}
}
 
 
/* Start an inferior Unix child process and sets inferior_ptid to its
/* Start an inferior Unix child process and sets inferior_ptid to its
   pid.  EXEC_FILE is the file to run.  ALLARGS is a string containing
   pid.  EXEC_FILE is the file to run.  ALLARGS is a string containing
   the arguments to the program.  ENV is the environment vector to
   the arguments to the program.  ENV is the environment vector to
   pass.  SHELL_FILE is the shell file, or NULL if we should pick
   pass.  SHELL_FILE is the shell file, or NULL if we should pick
   one.  */
   one.  */
 
 
/* This function is NOT reentrant.  Some of the variables have been
/* This function is NOT reentrant.  Some of the variables have been
   made static to ensure that they survive the vfork call.  */
   made static to ensure that they survive the vfork call.  */
 
 
int
int
fork_inferior (char *exec_file_arg, char *allargs, char **env,
fork_inferior (char *exec_file_arg, char *allargs, char **env,
               void (*traceme_fun) (void), void (*init_trace_fun) (int),
               void (*traceme_fun) (void), void (*init_trace_fun) (int),
               void (*pre_trace_fun) (void), char *shell_file_arg)
               void (*pre_trace_fun) (void), char *shell_file_arg)
{
{
  int pid;
  int pid;
  char *shell_command;
  char *shell_command;
  static char default_shell_file[] = SHELL_FILE;
  static char default_shell_file[] = SHELL_FILE;
  int len;
  int len;
  /* Set debug_fork then attach to the child while it sleeps, to debug. */
  /* Set debug_fork then attach to the child while it sleeps, to debug. */
  static int debug_fork = 0;
  static int debug_fork = 0;
  /* This is set to the result of setpgrp, which if vforked, will be visible
  /* 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.  */
     to you in the parent process.  It's only used by humans for debugging.  */
  static int debug_setpgrp = 657473;
  static int debug_setpgrp = 657473;
  static char *shell_file;
  static char *shell_file;
  static char *exec_file;
  static char *exec_file;
  char **save_our_env;
  char **save_our_env;
  int shell = 0;
  int shell = 0;
  static char **argv;
  static char **argv;
  const char *inferior_io_terminal = get_inferior_io_terminal ();
  const char *inferior_io_terminal = get_inferior_io_terminal ();
  struct inferior *inf;
  struct inferior *inf;
 
 
  /* If no exec file handed to us, get it from the exec-file command
  /* If no exec file handed to us, get it from the exec-file command
     -- with a good, common error message if none is specified.  */
     -- with a good, common error message if none is specified.  */
  exec_file = exec_file_arg;
  exec_file = exec_file_arg;
  if (exec_file == 0)
  if (exec_file == 0)
    exec_file = get_exec_file (1);
    exec_file = get_exec_file (1);
 
 
  /* STARTUP_WITH_SHELL is defined in inferior.h.  If 0,e we'll just
  /* STARTUP_WITH_SHELL is defined in inferior.h.  If 0,e we'll just
    do a fork/exec, no shell, so don't bother figuring out what
    do a fork/exec, no shell, so don't bother figuring out what
    shell.  */
    shell.  */
  shell_file = shell_file_arg;
  shell_file = shell_file_arg;
  if (STARTUP_WITH_SHELL)
  if (STARTUP_WITH_SHELL)
    {
    {
      /* Figure out what shell to start up the user program under.  */
      /* Figure out what shell to start up the user program under.  */
      if (shell_file == NULL)
      if (shell_file == NULL)
        shell_file = getenv ("SHELL");
        shell_file = getenv ("SHELL");
      if (shell_file == NULL)
      if (shell_file == NULL)
        shell_file = default_shell_file;
        shell_file = default_shell_file;
      shell = 1;
      shell = 1;
    }
    }
 
 
  /* Multiplying the length of exec_file by 4 is to account for the
  /* Multiplying the length of exec_file by 4 is to account for the
     fact that it may expand when quoted; it is a worst-case number
     fact that it may expand when quoted; it is a worst-case number
     based on every character being '.  */
     based on every character being '.  */
  len = 5 + 4 * strlen (exec_file) + 1 + strlen (allargs) + 1 + /*slop */ 12;
  len = 5 + 4 * strlen (exec_file) + 1 + strlen (allargs) + 1 + /*slop */ 12;
  if (exec_wrapper)
  if (exec_wrapper)
    len += strlen (exec_wrapper) + 1;
    len += strlen (exec_wrapper) + 1;
 
 
  shell_command = (char *) alloca (len);
  shell_command = (char *) alloca (len);
  shell_command[0] = '\0';
  shell_command[0] = '\0';
 
 
  if (!shell)
  if (!shell)
    {
    {
      /* We're going to call execvp.  Create argument vector.
      /* We're going to call execvp.  Create argument vector.
         Calculate an upper bound on the length of the vector by
         Calculate an upper bound on the length of the vector by
         assuming that every other character is a separate
         assuming that every other character is a separate
         argument.  */
         argument.  */
      int argc = (strlen (allargs) + 1) / 2 + 2;
      int argc = (strlen (allargs) + 1) / 2 + 2;
      argv = (char **) xmalloc (argc * sizeof (*argv));
      argv = (char **) xmalloc (argc * sizeof (*argv));
      argv[0] = exec_file;
      argv[0] = exec_file;
      breakup_args (allargs, &argv[1]);
      breakup_args (allargs, &argv[1]);
    }
    }
  else
  else
    {
    {
      /* We're going to call a shell.  */
      /* We're going to call a shell.  */
 
 
      char *p;
      char *p;
      int need_to_quote;
      int need_to_quote;
      const int escape_bang = escape_bang_in_quoted_argument (shell_file);
      const int escape_bang = escape_bang_in_quoted_argument (shell_file);
 
 
      strcat (shell_command, "exec ");
      strcat (shell_command, "exec ");
 
 
      /* Add any exec wrapper.  That may be a program name with arguments, so
      /* Add any exec wrapper.  That may be a program name with arguments, so
         the user must handle quoting.  */
         the user must handle quoting.  */
      if (exec_wrapper)
      if (exec_wrapper)
        {
        {
          strcat (shell_command, exec_wrapper);
          strcat (shell_command, exec_wrapper);
          strcat (shell_command, " ");
          strcat (shell_command, " ");
        }
        }
 
 
      /* Now add exec_file, quoting as necessary.  */
      /* Now add exec_file, quoting as necessary.  */
 
 
      /* Quoting in this style is said to work with all shells.  But
      /* Quoting in this style is said to work with all shells.  But
         csh on IRIX 4.0.1 can't deal with it.  So we only quote it if
         csh on IRIX 4.0.1 can't deal with it.  So we only quote it if
         we need to.  */
         we need to.  */
      p = exec_file;
      p = exec_file;
      while (1)
      while (1)
        {
        {
          switch (*p)
          switch (*p)
            {
            {
            case '\'':
            case '\'':
            case '!':
            case '!':
            case '"':
            case '"':
            case '(':
            case '(':
            case ')':
            case ')':
            case '$':
            case '$':
            case '&':
            case '&':
            case ';':
            case ';':
            case '<':
            case '<':
            case '>':
            case '>':
            case ' ':
            case ' ':
            case '\n':
            case '\n':
            case '\t':
            case '\t':
              need_to_quote = 1;
              need_to_quote = 1;
              goto end_scan;
              goto end_scan;
 
 
            case '\0':
            case '\0':
              need_to_quote = 0;
              need_to_quote = 0;
              goto end_scan;
              goto end_scan;
 
 
            default:
            default:
              break;
              break;
            }
            }
          ++p;
          ++p;
        }
        }
    end_scan:
    end_scan:
      if (need_to_quote)
      if (need_to_quote)
        {
        {
          strcat (shell_command, "'");
          strcat (shell_command, "'");
          for (p = exec_file; *p != '\0'; ++p)
          for (p = exec_file; *p != '\0'; ++p)
            {
            {
              if (*p == '\'')
              if (*p == '\'')
                strcat (shell_command, "'\\''");
                strcat (shell_command, "'\\''");
              else if (*p == '!' && escape_bang)
              else if (*p == '!' && escape_bang)
                strcat (shell_command, "\\!");
                strcat (shell_command, "\\!");
              else
              else
                strncat (shell_command, p, 1);
                strncat (shell_command, p, 1);
            }
            }
          strcat (shell_command, "'");
          strcat (shell_command, "'");
        }
        }
      else
      else
        strcat (shell_command, exec_file);
        strcat (shell_command, exec_file);
 
 
      strcat (shell_command, " ");
      strcat (shell_command, " ");
      strcat (shell_command, allargs);
      strcat (shell_command, allargs);
    }
    }
 
 
  /* On some systems an exec will fail if the executable is open.  */
  /* On some systems an exec will fail if the executable is open.  */
  close_exec_file ();
  close_exec_file ();
 
 
  /* Retain a copy of our environment variables, since the child will
  /* Retain a copy of our environment variables, since the child will
     replace the value of environ and if we're vforked, we have to
     replace the value of environ and if we're vforked, we have to
     restore it.  */
     restore it.  */
  save_our_env = environ;
  save_our_env = environ;
 
 
  /* Tell the terminal handling subsystem what tty we plan to run on;
  /* Tell the terminal handling subsystem what tty we plan to run on;
     it will just record the information for later.  */
     it will just record the information for later.  */
  new_tty_prefork (inferior_io_terminal);
  new_tty_prefork (inferior_io_terminal);
 
 
  /* It is generally good practice to flush any possible pending stdio
  /* It is generally good practice to flush any possible pending stdio
     output prior to doing a fork, to avoid the possibility of both
     output prior to doing a fork, to avoid the possibility of both
     the parent and child flushing the same data after the fork. */
     the parent and child flushing the same data after the fork. */
  gdb_flush (gdb_stdout);
  gdb_flush (gdb_stdout);
  gdb_flush (gdb_stderr);
  gdb_flush (gdb_stderr);
 
 
  /* If there's any initialization of the target layers that must
  /* If there's any initialization of the target layers that must
     happen to prepare to handle the child we're about fork, do it
     happen to prepare to handle the child we're about fork, do it
     now...  */
     now...  */
  if (pre_trace_fun != NULL)
  if (pre_trace_fun != NULL)
    (*pre_trace_fun) ();
    (*pre_trace_fun) ();
 
 
  /* Create the child process.  Since the child process is going to
  /* Create the child process.  Since the child process is going to
     exec(3) shortly afterwards, try to reduce the overhead by
     exec(3) shortly afterwards, try to reduce the overhead by
     calling vfork(2).  However, if PRE_TRACE_FUN is non-null, it's
     calling vfork(2).  However, if PRE_TRACE_FUN is non-null, it's
     likely that this optimization won't work since there's too much
     likely that this optimization won't work since there's too much
     work to do between the vfork(2) and the exec(3).  This is known
     work to do between the vfork(2) and the exec(3).  This is known
     to be the case on ttrace(2)-based HP-UX, where some handshaking
     to be the case on ttrace(2)-based HP-UX, where some handshaking
     between parent and child needs to happen between fork(2) and
     between parent and child needs to happen between fork(2) and
     exec(2).  However, since the parent is suspended in the vforked
     exec(2).  However, since the parent is suspended in the vforked
     state, this doesn't work.  Also note that the vfork(2) call might
     state, this doesn't work.  Also note that the vfork(2) call might
     actually be a call to fork(2) due to the fact that autoconf will
     actually be a call to fork(2) due to the fact that autoconf will
     ``#define vfork fork'' on certain platforms.  */
     ``#define vfork fork'' on certain platforms.  */
  if (pre_trace_fun || debug_fork)
  if (pre_trace_fun || debug_fork)
    pid = fork ();
    pid = fork ();
  else
  else
    pid = vfork ();
    pid = vfork ();
 
 
  if (pid < 0)
  if (pid < 0)
    perror_with_name (("vfork"));
    perror_with_name (("vfork"));
 
 
  if (pid == 0)
  if (pid == 0)
    {
    {
      if (debug_fork)
      if (debug_fork)
        sleep (debug_fork);
        sleep (debug_fork);
 
 
      /* Create a new session for the inferior process, if necessary.
      /* Create a new session for the inferior process, if necessary.
         It will also place the inferior in a separate process group.  */
         It will also place the inferior in a separate process group.  */
      if (create_tty_session () <= 0)
      if (create_tty_session () <= 0)
        {
        {
          /* No session was created, but we still want to run the inferior
          /* No session was created, but we still want to run the inferior
             in a separate process group.  */
             in a separate process group.  */
          debug_setpgrp = gdb_setpgid ();
          debug_setpgrp = gdb_setpgid ();
          if (debug_setpgrp == -1)
          if (debug_setpgrp == -1)
            perror ("setpgrp failed in child");
            perror ("setpgrp failed in child");
        }
        }
 
 
      /* Ask the tty subsystem to switch to the one we specified
      /* Ask the tty subsystem to switch to the one we specified
         earlier (or to share the current terminal, if none was
         earlier (or to share the current terminal, if none was
         specified).  */
         specified).  */
      new_tty ();
      new_tty ();
 
 
      /* Changing the signal handlers for the inferior after
      /* Changing the signal handlers for the inferior after
         a vfork can also change them for the superior, so we don't mess
         a vfork can also change them for the superior, so we don't mess
         with signals here.  See comments in
         with signals here.  See comments in
         initialize_signals for how we get the right signal handlers
         initialize_signals for how we get the right signal handlers
         for the inferior.  */
         for the inferior.  */
 
 
      /* "Trace me, Dr. Memory!" */
      /* "Trace me, Dr. Memory!" */
      (*traceme_fun) ();
      (*traceme_fun) ();
 
 
      /* The call above set this process (the "child") as debuggable
      /* The call above set this process (the "child") as debuggable
        by the original gdb process (the "parent").  Since processes
        by the original gdb process (the "parent").  Since processes
        (unlike people) can have only one parent, if you are debugging
        (unlike people) can have only one parent, if you are debugging
        gdb itself (and your debugger is thus _already_ the
        gdb itself (and your debugger is thus _already_ the
        controller/parent for this child), code from here on out is
        controller/parent for this child), code from here on out is
        undebuggable.  Indeed, you probably got an error message
        undebuggable.  Indeed, you probably got an error message
        saying "not parent".  Sorry; you'll have to use print
        saying "not parent".  Sorry; you'll have to use print
        statements!  */
        statements!  */
 
 
      /* There is no execlpe call, so we have to set the environment
      /* There is no execlpe call, so we have to set the environment
         for our child in the global variable.  If we've vforked, this
         for our child in the global variable.  If we've vforked, this
         clobbers the parent, but environ is restored a few lines down
         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
         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.  */
         path to find $SHELL.  Rich Pixley says so, and I agree.  */
      environ = env;
      environ = env;
 
 
      /* If we decided above to start up with a shell, we exec the
      /* If we decided above to start up with a shell, we exec the
         shell, "-c" says to interpret the next arg as a shell command
         shell, "-c" says to interpret the next arg as a shell command
         to execute, and this command is "exec <target-program>
         to execute, and this command is "exec <target-program>
         <args>".  */
         <args>".  */
      if (shell)
      if (shell)
        {
        {
          execlp (shell_file, shell_file, "-c", shell_command, (char *) 0);
          execlp (shell_file, shell_file, "-c", shell_command, (char *) 0);
 
 
          /* If we get here, it's an error.  */
          /* If we get here, it's an error.  */
          fprintf_unfiltered (gdb_stderr, "Cannot exec %s: %s.\n", shell_file,
          fprintf_unfiltered (gdb_stderr, "Cannot exec %s: %s.\n", shell_file,
                              safe_strerror (errno));
                              safe_strerror (errno));
          gdb_flush (gdb_stderr);
          gdb_flush (gdb_stderr);
          _exit (0177);
          _exit (0177);
        }
        }
      else
      else
        {
        {
          /* Otherwise, we directly exec the target program with
          /* Otherwise, we directly exec the target program with
             execvp.  */
             execvp.  */
          int i;
          int i;
          char *errstring;
          char *errstring;
 
 
          execvp (exec_file, argv);
          execvp (exec_file, argv);
 
 
          /* If we get here, it's an error.  */
          /* If we get here, it's an error.  */
          errstring = safe_strerror (errno);
          errstring = safe_strerror (errno);
          fprintf_unfiltered (gdb_stderr, "Cannot exec %s ", exec_file);
          fprintf_unfiltered (gdb_stderr, "Cannot exec %s ", exec_file);
 
 
          i = 1;
          i = 1;
          while (argv[i] != NULL)
          while (argv[i] != NULL)
            {
            {
              if (i != 1)
              if (i != 1)
                fprintf_unfiltered (gdb_stderr, " ");
                fprintf_unfiltered (gdb_stderr, " ");
              fprintf_unfiltered (gdb_stderr, "%s", argv[i]);
              fprintf_unfiltered (gdb_stderr, "%s", argv[i]);
              i++;
              i++;
            }
            }
          fprintf_unfiltered (gdb_stderr, ".\n");
          fprintf_unfiltered (gdb_stderr, ".\n");
#if 0
#if 0
          /* This extra info seems to be useless.  */
          /* This extra info seems to be useless.  */
          fprintf_unfiltered (gdb_stderr, "Got error %s.\n", errstring);
          fprintf_unfiltered (gdb_stderr, "Got error %s.\n", errstring);
#endif
#endif
          gdb_flush (gdb_stderr);
          gdb_flush (gdb_stderr);
          _exit (0177);
          _exit (0177);
        }
        }
    }
    }
 
 
  /* Restore our environment in case a vforked child clob'd it.  */
  /* Restore our environment in case a vforked child clob'd it.  */
  environ = save_our_env;
  environ = save_our_env;
 
 
  if (!have_inferiors ())
  if (!have_inferiors ())
    init_thread_list ();
    init_thread_list ();
 
 
  inf = current_inferior ();
  inf = current_inferior ();
 
 
  inferior_appeared (inf, pid);
  inferior_appeared (inf, pid);
 
 
  /* Needed for wait_for_inferior stuff below.  */
  /* Needed for wait_for_inferior stuff below.  */
  inferior_ptid = pid_to_ptid (pid);
  inferior_ptid = pid_to_ptid (pid);
 
 
  new_tty_postfork ();
  new_tty_postfork ();
 
 
  /* We have something that executes now.  We'll be running through
  /* We have something that executes now.  We'll be running through
     the shell at this point, but the pid shouldn't change.  Targets
     the shell at this point, but the pid shouldn't change.  Targets
     supporting MT should fill this task's ptid with more data as soon
     supporting MT should fill this task's ptid with more data as soon
     as they can.  */
     as they can.  */
  add_thread_silent (inferior_ptid);
  add_thread_silent (inferior_ptid);
 
 
  /* Now that we have a child process, make it our target, and
  /* Now that we have a child process, make it our target, and
     initialize anything target-vector-specific that needs
     initialize anything target-vector-specific that needs
     initializing.  */
     initializing.  */
  if (init_trace_fun)
  if (init_trace_fun)
    (*init_trace_fun) (pid);
    (*init_trace_fun) (pid);
 
 
  /* We are now in the child process of interest, having exec'd the
  /* We are now in the child process of interest, having exec'd the
     correct program, and are poised at the first instruction of the
     correct program, and are poised at the first instruction of the
     new program.  */
     new program.  */
  return pid;
  return pid;
}
}
 
 
/* Accept NTRAPS traps from the inferior.  */
/* Accept NTRAPS traps from the inferior.  */
 
 
void
void
startup_inferior (int ntraps)
startup_inferior (int ntraps)
{
{
  int pending_execs = ntraps;
  int pending_execs = ntraps;
  int terminal_initted = 0;
  int terminal_initted = 0;
  ptid_t resume_ptid;
  ptid_t resume_ptid;
 
 
  if (target_supports_multi_process ())
  if (target_supports_multi_process ())
    resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid));
    resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid));
  else
  else
    resume_ptid = minus_one_ptid;
    resume_ptid = minus_one_ptid;
 
 
  /* The process was started by the fork that created it, but it will
  /* The process was started by the fork that created it, but it will
     have stopped one instruction after execing the shell.  Here we
     have stopped one instruction after execing the shell.  Here we
     must get it up to actual execution of the real program.  */
     must get it up to actual execution of the real program.  */
 
 
  if (exec_wrapper)
  if (exec_wrapper)
    pending_execs++;
    pending_execs++;
 
 
  while (1)
  while (1)
    {
    {
      int resume_signal = TARGET_SIGNAL_0;
      int resume_signal = TARGET_SIGNAL_0;
      ptid_t event_ptid;
      ptid_t event_ptid;
 
 
      struct target_waitstatus ws;
      struct target_waitstatus ws;
      memset (&ws, 0, sizeof (ws));
      memset (&ws, 0, sizeof (ws));
      event_ptid = target_wait (resume_ptid, &ws, 0);
      event_ptid = target_wait (resume_ptid, &ws, 0);
 
 
      if (ws.kind == TARGET_WAITKIND_IGNORE)
      if (ws.kind == TARGET_WAITKIND_IGNORE)
        /* The inferior didn't really stop, keep waiting.  */
        /* The inferior didn't really stop, keep waiting.  */
        continue;
        continue;
 
 
      switch (ws.kind)
      switch (ws.kind)
        {
        {
          case TARGET_WAITKIND_SPURIOUS:
          case TARGET_WAITKIND_SPURIOUS:
          case TARGET_WAITKIND_LOADED:
          case TARGET_WAITKIND_LOADED:
          case TARGET_WAITKIND_FORKED:
          case TARGET_WAITKIND_FORKED:
          case TARGET_WAITKIND_VFORKED:
          case TARGET_WAITKIND_VFORKED:
          case TARGET_WAITKIND_SYSCALL_ENTRY:
          case TARGET_WAITKIND_SYSCALL_ENTRY:
          case TARGET_WAITKIND_SYSCALL_RETURN:
          case TARGET_WAITKIND_SYSCALL_RETURN:
            /* Ignore gracefully during startup of the inferior.  */
            /* Ignore gracefully during startup of the inferior.  */
            switch_to_thread (event_ptid);
            switch_to_thread (event_ptid);
            break;
            break;
 
 
          case TARGET_WAITKIND_SIGNALLED:
          case TARGET_WAITKIND_SIGNALLED:
            target_terminal_ours ();
            target_terminal_ours ();
            target_mourn_inferior ();
            target_mourn_inferior ();
            error (_("During startup program terminated with signal %s, %s."),
            error (_("During startup program terminated with signal %s, %s."),
                   target_signal_to_name (ws.value.sig),
                   target_signal_to_name (ws.value.sig),
                   target_signal_to_string (ws.value.sig));
                   target_signal_to_string (ws.value.sig));
            return;
            return;
 
 
          case TARGET_WAITKIND_EXITED:
          case TARGET_WAITKIND_EXITED:
            target_terminal_ours ();
            target_terminal_ours ();
            target_mourn_inferior ();
            target_mourn_inferior ();
            if (ws.value.integer)
            if (ws.value.integer)
              error (_("During startup program exited with code %d."),
              error (_("During startup program exited with code %d."),
                     ws.value.integer);
                     ws.value.integer);
            else
            else
              error (_("During startup program exited normally."));
              error (_("During startup program exited normally."));
            return;
            return;
 
 
          case TARGET_WAITKIND_EXECD:
          case TARGET_WAITKIND_EXECD:
            /* Handle EXEC signals as if they were SIGTRAP signals.  */
            /* Handle EXEC signals as if they were SIGTRAP signals.  */
            xfree (ws.value.execd_pathname);
            xfree (ws.value.execd_pathname);
            resume_signal = TARGET_SIGNAL_TRAP;
            resume_signal = TARGET_SIGNAL_TRAP;
            switch_to_thread (event_ptid);
            switch_to_thread (event_ptid);
            break;
            break;
 
 
          case TARGET_WAITKIND_STOPPED:
          case TARGET_WAITKIND_STOPPED:
            resume_signal = ws.value.sig;
            resume_signal = ws.value.sig;
            switch_to_thread (event_ptid);
            switch_to_thread (event_ptid);
            break;
            break;
        }
        }
 
 
      if (resume_signal != TARGET_SIGNAL_TRAP)
      if (resume_signal != TARGET_SIGNAL_TRAP)
        {
        {
          /* Let shell child handle its own signals in its own way.  */
          /* Let shell child handle its own signals in its own way.  */
          target_resume (resume_ptid, 0, resume_signal);
          target_resume (resume_ptid, 0, resume_signal);
        }
        }
      else
      else
        {
        {
          /* We handle SIGTRAP, however; it means child did an exec.  */
          /* We handle SIGTRAP, however; it means child did an exec.  */
          if (!terminal_initted)
          if (!terminal_initted)
            {
            {
              /* Now that the child has exec'd we know it has already
              /* Now that the child has exec'd we know it has already
                 set its process group.  On POSIX systems, tcsetpgrp
                 set its process group.  On POSIX systems, tcsetpgrp
                 will fail with EPERM if we try it before the child's
                 will fail with EPERM if we try it before the child's
                 setpgid.  */
                 setpgid.  */
 
 
              /* Set up the "saved terminal modes" of the inferior
              /* Set up the "saved terminal modes" of the inferior
                 based on what modes we are starting it with.  */
                 based on what modes we are starting it with.  */
              target_terminal_init ();
              target_terminal_init ();
 
 
              /* Install inferior's terminal modes.  */
              /* Install inferior's terminal modes.  */
              target_terminal_inferior ();
              target_terminal_inferior ();
 
 
              terminal_initted = 1;
              terminal_initted = 1;
            }
            }
 
 
          if (--pending_execs == 0)
          if (--pending_execs == 0)
            break;
            break;
 
 
          /* Just make it go on.  */
          /* Just make it go on.  */
          target_resume (resume_ptid, 0, TARGET_SIGNAL_0);
          target_resume (resume_ptid, 0, TARGET_SIGNAL_0);
        }
        }
    }
    }
 
 
  /* Mark all threads non-executing.  */
  /* Mark all threads non-executing.  */
  set_executing (resume_ptid, 0);
  set_executing (resume_ptid, 0);
}
}
 
 
/* Implement the "unset exec-wrapper" command.  */
/* Implement the "unset exec-wrapper" command.  */
 
 
static void
static void
unset_exec_wrapper_command (char *args, int from_tty)
unset_exec_wrapper_command (char *args, int from_tty)
{
{
  xfree (exec_wrapper);
  xfree (exec_wrapper);
  exec_wrapper = NULL;
  exec_wrapper = NULL;
}
}
 
 
/* Provide a prototype to silence -Wmissing-prototypes.  */
/* Provide a prototype to silence -Wmissing-prototypes.  */
extern initialize_file_ftype _initialize_fork_child;
extern initialize_file_ftype _initialize_fork_child;
 
 
void
void
_initialize_fork_child (void)
_initialize_fork_child (void)
{
{
  add_setshow_filename_cmd ("exec-wrapper", class_run, &exec_wrapper, _("\
  add_setshow_filename_cmd ("exec-wrapper", class_run, &exec_wrapper, _("\
Set a wrapper for running programs.\n\
Set a wrapper for running programs.\n\
The wrapper prepares the system and environment for the new program."),
The wrapper prepares the system and environment for the new program."),
                            _("\
                            _("\
Show the wrapper for running programs."), NULL,
Show the wrapper for running programs."), NULL,
                            NULL, NULL,
                            NULL, NULL,
                            &setlist, &showlist);
                            &setlist, &showlist);
 
 
  add_cmd ("exec-wrapper", class_run, unset_exec_wrapper_command,
  add_cmd ("exec-wrapper", class_run, unset_exec_wrapper_command,
           _("Disable use of an execution wrapper."),
           _("Disable use of an execution wrapper."),
           &unsetlist);
           &unsetlist);
}
}
 
 

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