/* Fork a Unix child process, and set up to debug it, for GDB.
- Copyright 1990, 1991, 1992, 1993, 1994, 1996 Free Software Foundation, Inc.
+ Copyright 1990, 91, 92, 93, 94, 1996, 1999 Free Software Foundation, Inc.
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
-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 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.
+ 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. */
+ 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 "gdb_string.h"
#include "frame.h" /* required by inferior.h */
#include "inferior.h"
#include "target.h"
-#include "wait.h"
+#include "gdb_wait.h"
#include "gdbcore.h"
#include "terminal.h"
#include "gdbthread.h"
+#include "command.h" /* for dont_repeat () */
#include <signal.h>
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-
-#define DEBUGGING 0
/* This just gets used as a default if we can't find SHELL */
#ifndef SHELL_FILE
* the four arguments "a", "b", "c", "d".
*/
static void
-breakup_args (
- scratch,
- argv)
- char *scratch;
- char **argv;
+breakup_args (char *scratch, char **argv)
{
char *cp = scratch;
-#if DEBUGGING
- printf ("breakup_args: input = %s\n", scratch);
-#endif
for (;;)
{
char *exec_file;
char *allargs;
char **env;
- void (*traceme_fun) PARAMS ((void));
- void (*init_trace_fun) PARAMS ((int));
- void (*pre_trace_fun) PARAMS ((void));
+ void (*traceme_fun) (void);
+ void (*init_trace_fun) (int);
+ void (*pre_trace_fun) (void);
char *shell_file;
{
int pid;
char **save_our_env;
int shell = 0;
char **argv;
- char *tryname;
/* If no exec file handed to us, get it from the exec-file command -- with
a good, common error message if none is specified. */
shell = 1;
}
-#if DEBUGGING
- printf ("shell is %s\n", shell_file);
-#endif
-
/* 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 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 desired, concat something onto the front of ALLARGS.
SHELL_COMMAND is the result. */
#ifdef SHELL_COMMAND_CONCAT
{
/* We're going to call execvp. Create argv */
/* Largest case: every other character is a separate arg */
-#if DEBUGGING
- printf ("allocating argv, length = %d\n",
- (
- (strlen (allargs) + 1) / (unsigned) 2
- + 2
- ) * sizeof (*argv)
- );
-#endif
argv = (char **) xmalloc (((strlen (allargs) + 1) / (unsigned) 2 + 2) * sizeof (*argv));
argv[0] = exec_file;
breakup_args (allargs, &argv[1]);
strcat (shell_command, "exec ");
/* 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 we need
- to. */
+ on IRIX 4.0.1 can't deal with it. So we only quote it if we need
+ to. */
p = exec_file;
while (1)
{
gdb_flush (gdb_stderr);
/* If there's any initialization of the target layers that must happen
- to prepare to handle the child we're about fork, do it now...
+ to prepare to handle the child we're about fork, do it now...
*/
if (pre_trace_fun != NULL)
(*pre_trace_fun) ();
perror ("setpgrp failed in child");
/* Ask the tty subsystem to switch to the one we specified earlier
- (or to share the current terminal, if none was specified). */
+ (or to share the current terminal, if none was specified). */
new_tty ();
/* 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. */
+ 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. */
/* "Trace me, Dr. Memory!" */
(*traceme_fun) ();
*/
/* 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. */
+ 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;
/* If we decided above to start up with a shell,
*/
if (shell)
{
-#if 0
-
- /* HP change is problematic. The -f option has different meanings
- for different shells. It is particularly inappropriate for
- bourne shells. */
- execlp (shell_file, shell_file, "-f", "-c", shell_command, (char *) 0);
-#else
execlp (shell_file, shell_file, "-c", shell_command, (char *) 0);
-#endif
-
/* If we get here, it's an error */
fprintf_unfiltered (gdb_stderr, "Cannot exec %s: %s.\n", shell_file,
/* Otherwise, we directly exec the target program with execvp. */
int i;
char *errstring;
-#if DEBUGGING
- printf ("about to exec target, exec_file = %s\n", exec_file);
- i = 0;
- while (argv[i] != NULL)
- {
- printf ("strlen(argv[%d]) is %d\n", i, strlen (argv[i]));
- printf ("argv[%d] is %s\n", i, argv[i]);
- i++;
- }
-#endif
+
execvp (exec_file, argv);
/* If we get here, it's an error */
}
fprintf_unfiltered (gdb_stderr, ".\n");
/* 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);
+ */
gdb_flush (gdb_stderr);
_exit (0177);
}
Also, the original debugger will set FOLLOWED_CHILD FALSE, while the
clone will set it TRUE.
- */
+ */
void
-clone_and_follow_inferior (child_pid, followed_child)
- int child_pid;
- int *followed_child;
+clone_and_follow_inferior (int child_pid, int *followed_child)
{
extern int auto_solib_add;
this way because on some targets, only one process at a time can
trace another. Thus, the original debugger must relinquish its
tracing rights before the clone can pick them up.)
- */
+ */
#define SEM_TALK (1)
#define SEM_LISTEN (0)
int handoff_semaphore[2]; /* Original "talks" to [1], clone "listens" to [0] */
gdb_flush (gdb_stderr);
/* Open the semaphore pipes.
- */
+ */
status = pipe (handoff_semaphore);
if (status < 0)
error ("error getting pipe for handoff semaphore");
perror_with_name ("fork");
/* Are we the original debugger? If so, we must relinquish all claims
- to CHILD_PID. */
+ to CHILD_PID. */
if (debugger_pid != 0)
{
- char signal_spelling[100];/* Arbitrary but sufficient length */
+ char signal_spelling[100]; /* Arbitrary but sufficient length */
/* Detach from CHILD_PID. Deliver a "stop" signal when we do, though,
- so that it remains stopped until the clone debugger can attach
- to it.
+ so that it remains stopped until the clone debugger can attach
+ to it.
*/
detach_breakpoints (child_pid);
Wait until the original debugger relinquishes control of CHILD_PID,
though.
- */
+ */
read (handoff_semaphore[SEM_LISTEN], &listen_value, sizeof (listen_value));
/* Note that we DON'T want to actually detach from inferior_pid,
debugger wants to retain control of the process. So, we
just reset inferior_pid to CHILD_PID, and then ensure that all
breakpoints are really set in CHILD_PID.
- */
+ */
target_mourn_inferior ();
/* Ask the tty subsystem to switch to the one we specified earlier
of attaching can behave differently on some targets than the
standard method, where a process formerly not under debugger
control was suddenly attached to..)
- */
+ */
target_post_follow_inferior_by_clone ();
*followed_child = 1;
/* Accept NTRAPS traps from the inferior. */
void
-startup_inferior (ntraps)
- int ntraps;
+startup_inferior (int ntraps)
{
int pending_execs = ntraps;
int terminal_initted;
if (!terminal_initted)
{
/* Now that the child has exec'd we know it has already set its
- process group. On POSIX systems, tcsetpgrp will fail with
- EPERM if we try it before the child's setpgid. */
+ process group. On POSIX systems, tcsetpgrp will fail with
+ EPERM if we try it before the child's setpgid. */
/* 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 ();
/* Install inferior's terminal modes. */
projects / thirdparty / binutils-gdb.git / blobdiff