391 lines
9.5 KiB
C
391 lines
9.5 KiB
C
/* Target-vector operations for controlling Unix child processes, for GDB.
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Copyright 1990, 1991, 1992, 1993, 1994, 1995
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Free Software Foundation, Inc.
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Contributed by Cygnus Support.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "frame.h" /* required by inferior.h */
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#include "inferior.h"
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#include "target.h"
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#include "wait.h"
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#include "gdbcore.h"
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#include "command.h"
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#include <signal.h>
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#include <sys/types.h>
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#include <fcntl.h>
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static void
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child_prepare_to_store PARAMS ((void));
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#ifndef CHILD_WAIT
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static int child_wait PARAMS ((int, struct target_waitstatus *));
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#endif /* CHILD_WAIT */
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static void child_open PARAMS ((char *, int));
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static void
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child_files_info PARAMS ((struct target_ops *));
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static void
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child_detach PARAMS ((char *, int));
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static void
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child_attach PARAMS ((char *, int));
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static void
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ptrace_me PARAMS ((void));
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static void
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ptrace_him PARAMS ((int));
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static void child_create_inferior PARAMS ((char *, char *, char **));
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static void
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child_mourn_inferior PARAMS ((void));
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static int
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child_can_run PARAMS ((void));
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static int child_thread_alive PARAMS ((int));
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extern char **environ;
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/* Forward declaration */
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extern struct target_ops child_ops;
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static int
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proc_wait (pid, status)
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int pid;
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int *status;
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{
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#ifndef __GO32__
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return wait (status);
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#endif
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}
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#ifndef CHILD_WAIT
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/* Wait for child to do something. Return pid of child, or -1 in case
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of error; store status through argument pointer OURSTATUS. */
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static int
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child_wait (pid, ourstatus)
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int pid;
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struct target_waitstatus *ourstatus;
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{
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int save_errno;
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int status;
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do {
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set_sigint_trap(); /* Causes SIGINT to be passed on to the
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attached process. */
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set_sigio_trap ();
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pid = proc_wait (inferior_pid, &status);
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save_errno = errno;
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clear_sigio_trap ();
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clear_sigint_trap();
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if (pid == -1)
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{
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if (save_errno == EINTR)
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continue;
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fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n",
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safe_strerror (save_errno));
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/* Claim it exited with unknown signal. */
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ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
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ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
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return -1;
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}
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} while (pid != inferior_pid); /* Some other child died or stopped */
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store_waitstatus (ourstatus, status);
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return pid;
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}
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#endif /* CHILD_WAIT */
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#ifndef CHILD_THREAD_ALIVE
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/* Check to see if the given thread is alive.
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FIXME: Is kill() ever the right way to do this? I doubt it, but
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for now we're going to try and be compatable with the old thread
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code. */
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static int
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child_thread_alive (pid)
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int pid;
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{
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return (kill (pid, 0) != -1);
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}
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#endif
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/* Attach to process PID, then initialize for debugging it. */
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static void
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child_attach (args, from_tty)
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char *args;
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int from_tty;
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{
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if (!args)
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error_no_arg ("process-id to attach");
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#ifndef ATTACH_DETACH
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error ("Can't attach to a process on this machine.");
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#else
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{
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char *exec_file;
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int pid;
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pid = atoi (args);
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if (pid == getpid()) /* Trying to masturbate? */
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error ("I refuse to debug myself!");
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if (from_tty)
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{
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exec_file = (char *) get_exec_file (0);
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if (exec_file)
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printf_unfiltered ("Attaching to program `%s', %s\n", exec_file,
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target_pid_to_str (pid));
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else
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printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid));
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gdb_flush (gdb_stdout);
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}
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attach (pid);
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inferior_pid = pid;
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push_target (&child_ops);
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}
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#endif /* ATTACH_DETACH */
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}
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/* Take a program previously attached to and detaches it.
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The program resumes execution and will no longer stop
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on signals, etc. We'd better not have left any breakpoints
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in the program or it'll die when it hits one. For this
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to work, it may be necessary for the process to have been
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previously attached. It *might* work if the program was
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started via the normal ptrace (PTRACE_TRACEME). */
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static void
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child_detach (args, from_tty)
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char *args;
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int from_tty;
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{
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#ifdef ATTACH_DETACH
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{
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int siggnal = 0;
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if (from_tty)
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{
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char *exec_file = get_exec_file (0);
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if (exec_file == 0)
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exec_file = "";
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printf_unfiltered ("Detaching from program: %s %s\n", exec_file,
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target_pid_to_str (inferior_pid));
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gdb_flush (gdb_stdout);
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}
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if (args)
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siggnal = atoi (args);
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detach (siggnal);
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inferior_pid = 0;
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unpush_target (&child_ops);
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}
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#else
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error ("This version of Unix does not support detaching a process.");
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#endif
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}
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/* Get ready to modify the registers array. On machines which store
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individual registers, this doesn't need to do anything. On machines
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which store all the registers in one fell swoop, this makes sure
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that registers contains all the registers from the program being
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debugged. */
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static void
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child_prepare_to_store ()
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{
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#ifdef CHILD_PREPARE_TO_STORE
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CHILD_PREPARE_TO_STORE ();
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#endif
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}
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/* Print status information about what we're accessing. */
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static void
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child_files_info (ignore)
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struct target_ops *ignore;
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{
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printf_unfiltered ("\tUsing the running image of %s %s.\n",
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attach_flag? "attached": "child", target_pid_to_str (inferior_pid));
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}
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/* ARGSUSED */
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static void
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child_open (arg, from_tty)
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char *arg;
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int from_tty;
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{
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error ("Use the \"run\" command to start a Unix child process.");
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}
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/* Stub function which causes the inferior that runs it, to be ptrace-able
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by its parent process. */
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static void
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ptrace_me ()
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{
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/* "Trace me, Dr. Memory!" */
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call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0);
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}
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/* Stub function which causes the GDB that runs it, to start ptrace-ing
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the child process. */
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static void
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ptrace_him (pid)
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int pid;
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{
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push_target (&child_ops);
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#ifdef START_INFERIOR_TRAPS_EXPECTED
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startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
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#else
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/* One trap to exec the shell, one to exec the program being debugged. */
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startup_inferior (2);
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#endif
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}
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/* Start an inferior Unix child process and sets inferior_pid to its pid.
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EXEC_FILE is the file to run.
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ALLARGS is a string containing the arguments to the program.
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ENV is the environment vector to pass. Errors reported with error(). */
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static void
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child_create_inferior (exec_file, allargs, env)
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char *exec_file;
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char *allargs;
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char **env;
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{
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fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, NULL);
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/* We are at the first instruction we care about. */
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/* Pedal to the metal... */
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proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
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}
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static void
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child_mourn_inferior ()
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{
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unpush_target (&child_ops);
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proc_remove_foreign (inferior_pid);
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generic_mourn_inferior ();
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}
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static int
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child_can_run ()
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{
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return(1);
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}
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/* Send a SIGINT to the process group. This acts just like the user typed a
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^C on the controlling terminal.
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XXX - This may not be correct for all systems. Some may want to use
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killpg() instead of kill (-pgrp). */
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void
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child_stop ()
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{
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extern pid_t inferior_process_group;
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kill (-inferior_process_group, SIGINT);
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}
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struct target_ops child_ops = {
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"child", /* to_shortname */
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"Unix child process", /* to_longname */
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"Unix child process (started by the \"run\" command).", /* to_doc */
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child_open, /* to_open */
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0, /* to_close */
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child_attach, /* to_attach */
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child_detach, /* to_detach */
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child_resume, /* to_resume */
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child_wait, /* to_wait */
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fetch_inferior_registers, /* to_fetch_registers */
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store_inferior_registers, /* to_store_registers */
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child_prepare_to_store, /* to_prepare_to_store */
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child_xfer_memory, /* to_xfer_memory */
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child_files_info, /* to_files_info */
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memory_insert_breakpoint, /* to_insert_breakpoint */
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memory_remove_breakpoint, /* to_remove_breakpoint */
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terminal_init_inferior, /* to_terminal_init */
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terminal_inferior, /* to_terminal_inferior */
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terminal_ours_for_output, /* to_terminal_ours_for_output */
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terminal_ours, /* to_terminal_ours */
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child_terminal_info, /* to_terminal_info */
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kill_inferior, /* to_kill */
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0, /* to_load */
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0, /* to_lookup_symbol */
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child_create_inferior, /* to_create_inferior */
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child_mourn_inferior, /* to_mourn_inferior */
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child_can_run, /* to_can_run */
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0, /* to_notice_signals */
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child_thread_alive, /* to_thread_alive */
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child_stop, /* to_stop */
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process_stratum, /* to_stratum */
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0, /* to_next */
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1, /* to_has_all_memory */
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1, /* to_has_memory */
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1, /* to_has_stack */
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1, /* to_has_registers */
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1, /* to_has_execution */
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0, /* to_sections */
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0, /* to_sections_end */
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OPS_MAGIC /* to_magic */
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};
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void
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_initialize_inftarg ()
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{
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#ifdef HAVE_OPTIONAL_PROC_FS
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char procname[32];
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int fd;
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/* If we have an optional /proc filesystem (e.g. under OSF/1),
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don't add ptrace support if we can access the running GDB via /proc. */
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#ifndef PROC_NAME_FMT
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#define PROC_NAME_FMT "/proc/%05d"
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#endif
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sprintf (procname, PROC_NAME_FMT, getpid ());
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if ((fd = open (procname, O_RDONLY)) >= 0)
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{
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close (fd);
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return;
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}
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#endif
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add_target (&child_ops);
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}
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