/* Fork a Unix child process, and set up to debug it, for GDB.
- Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
+ Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000,
+ 2001 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., 675 Mass Ave, Cambridge, MA 02139, 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 "frame.h" /* required by inferior.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 "gdb_vfork.h"
#include "gdbcore.h"
#include "terminal.h"
-#include "thread.h"
+#include "gdbthread.h"
+#include "command.h" /* for dont_repeat () */
#include <signal.h>
-#ifdef SET_STACK_LIMIT_HUGE
-#include <sys/time.h>
-#include <sys/resource.h>
-
-extern int original_stack_limit;
-#endif /* SET_STACK_LIMIT_HUGE */
+/* This just gets used as a default if we can't find SHELL */
+#ifndef SHELL_FILE
+#define SHELL_FILE "/bin/sh"
+#endif
extern char **environ;
-/* Start an inferior Unix child process and sets inferior_pid to its pid.
+/* This function breaks up an argument string into an argument
+ * vector suitable for passing to execvp().
+ * 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 fill in argv with
+ * the four arguments "a", "b", "c", "d".
+ */
+static void
+breakup_args (char *scratch, char **argv)
+{
+ char *cp = scratch;
+
+ for (;;)
+ {
+
+ /* Scan past leading separators */
+ while (*cp == ' ' || *cp == '\t' || *cp == '\n')
+ {
+ cp++;
+ }
+
+ /* Break if at end of string */
+ if (*cp == '\0')
+ break;
+
+ /* Take an arg */
+ *argv++ = cp;
+
+ /* Scan for next arg separator */
+ cp = strchr (cp, ' ');
+ if (cp == NULL)
+ cp = strchr (cp, '\t');
+ if (cp == NULL)
+ cp = strchr (cp, '\n');
+
+ /* No separators => end of string => break */
+ if (cp == NULL)
+ break;
+
+ /* Replace the separator with a terminator */
+ *cp++ = '\0';
+ }
+
+ /* execv requires a null-terminated arg vector */
+ *argv = NULL;
+
+}
+
+
+/* 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 the arguments to the program.
- ENV is the environment vector to pass. Errors reported with error(). */
+ ENV is the environment vector to pass. SHELL_FILE is the shell file,
+ or NULL if we should pick one. Errors reported with error(). */
-#ifndef SHELL_FILE
-#define SHELL_FILE "/bin/sh"
-#endif
+/* This function is NOT-REENTRANT. Some of the variables have been
+ made static to ensure that they survive the vfork() call. */
void
-fork_inferior (exec_file, allargs, env, traceme_fun, init_trace_fun)
- char *exec_file;
- char *allargs;
- char **env;
- void (*traceme_fun) PARAMS ((void));
- void (*init_trace_fun) PARAMS ((int));
+fork_inferior (char *exec_file_arg, char *allargs, char **env,
+ void (*traceme_fun) (void), void (*init_trace_fun) (int),
+ void (*pre_trace_fun) (void), char *shell_file_arg)
{
int pid;
char *shell_command;
- char *shell_file;
static char default_shell_file[] = SHELL_FILE;
int len;
- int pending_execs;
- int terminal_initted;
/* Set debug_fork then attach to the child while it sleeps, to debug. */
static int debug_fork = 0;
/* This is set to the result of setpgrp, which if vforked, will be visible
to you in the parent process. It's only used by humans for debugging. */
static int debug_setpgrp = 657473;
+ static char *shell_file;
+ static char *exec_file;
char **save_our_env;
+ int shell = 0;
+ static char **argv;
/* If no exec file handed to us, get it from the exec-file command -- with
a good, common error message if none is specified. */
+ exec_file = exec_file_arg;
if (exec_file == 0)
- exec_file = get_exec_file(1);
-
- /* The user might want tilde-expansion, and in general probably wants
- the program to behave the same way as if run from
- his/her favorite shell. So we let the shell run it for us.
- FIXME, this should probably search the local environment (as
- modified by the setenv command), not the env gdb inherited. */
- shell_file = getenv ("SHELL");
- if (shell_file == NULL)
- shell_file = default_shell_file;
+ exec_file = get_exec_file (1);
+
+ /* STARTUP_WITH_SHELL is defined in inferior.h.
+ * If 0, we'll just do a fork/exec, no shell, so don't
+ * bother figuring out what shell.
+ */
+ shell_file = shell_file_arg;
+ if (STARTUP_WITH_SHELL)
+ {
+ /* Figure out what shell to start up the user program under. */
+ if (shell_file == NULL)
+ shell_file = getenv ("SHELL");
+ if (shell_file == NULL)
+ shell_file = default_shell_file;
+ shell = 1;
+ }
/* 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
shell_command = (char *) alloca (len);
shell_command[0] = '\0';
#endif
- strcat (shell_command, "exec ");
-
- /* Now add exec_file, quoting as necessary. */
- {
- char *p;
- int need_to_quote;
-
- /* 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. */
- p = exec_file;
- while (1)
- {
- switch (*p)
- {
- case '\'':
- case '"':
- case '(':
- case ')':
- case '$':
- case '&':
- case ';':
- case '<':
- case '>':
- case ' ':
- case '\n':
- case '\t':
- need_to_quote = 1;
- goto end_scan;
-
- case '\0':
- need_to_quote = 0;
- goto end_scan;
-
- default:
- break;
- }
- ++p;
- }
- end_scan:
- if (need_to_quote)
- {
- strcat (shell_command, "'");
- for (p = exec_file; *p != '\0'; ++p)
- {
- if (*p == '\'')
- strcat (shell_command, "'\\''");
- else
- strncat (shell_command, p, 1);
- }
- strcat (shell_command, "'");
- }
- else
- strcat (shell_command, exec_file);
- }
-
- strcat (shell_command, " ");
- strcat (shell_command, allargs);
+
+ if (!shell)
+ {
+ /* We're going to call execvp. Create argv */
+ /* Largest case: every other character is a separate arg */
+ argv = (char **) xmalloc (((strlen (allargs) + 1) / (unsigned) 2 + 2) * sizeof (*argv));
+ argv[0] = exec_file;
+ breakup_args (allargs, &argv[1]);
+
+ }
+ else
+ {
+
+ /* We're going to call a shell */
+
+ /* Now add exec_file, quoting as necessary. */
+
+ char *p;
+ int need_to_quote;
+
+ strcat (shell_command, "exec ");
+
+ /* Quoting in this style is said to work with all shells. But csh
+ on IRIX 4.0.1 can't deal with it. So we only quote it if we need
+ to. */
+ p = exec_file;
+ while (1)
+ {
+ switch (*p)
+ {
+ case '\'':
+ case '!':
+ case '"':
+ case '(':
+ case ')':
+ case '$':
+ case '&':
+ case ';':
+ case '<':
+ case '>':
+ case ' ':
+ case '\n':
+ case '\t':
+ need_to_quote = 1;
+ goto end_scan;
+
+ case '\0':
+ need_to_quote = 0;
+ goto end_scan;
+
+ default:
+ break;
+ }
+ ++p;
+ }
+ end_scan:
+ if (need_to_quote)
+ {
+ strcat (shell_command, "'");
+ for (p = exec_file; *p != '\0'; ++p)
+ {
+ if (*p == '\'')
+ strcat (shell_command, "'\\''");
+ else if (*p == '!')
+ strcat (shell_command, "\\!");
+ else
+ strncat (shell_command, p, 1);
+ }
+ strcat (shell_command, "'");
+ }
+ else
+ strcat (shell_command, exec_file);
+
+ strcat (shell_command, " ");
+ strcat (shell_command, allargs);
+
+ }
/* exec is said to fail if the executable is open. */
close_exec_file ();
/* 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. */
save_our_env = environ;
output prior to doing a fork, to avoid the possibility of both the
parent and child flushing the same data after the fork. */
- fflush (stdout);
- fflush (stderr);
+ gdb_flush (gdb_stdout);
+ gdb_flush (gdb_stderr);
-#if defined(USG) && !defined(HAVE_VFORK)
- pid = fork ();
-#else
+ /* 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...
+ */
+ if (pre_trace_fun != NULL)
+ (*pre_trace_fun) ();
+
+ /* Create the child process. Note that the apparent call to vfork()
+ below *might* actually be a call to fork() due to the fact that
+ autoconf will ``#define vfork fork'' on certain platforms. */
if (debug_fork)
pid = fork ();
else
pid = vfork ();
-#endif
if (pid < 0)
perror_with_name ("vfork");
if (pid == 0)
{
- if (debug_fork)
+ if (debug_fork)
sleep (debug_fork);
/* Run inferior in a separate process group. */
debug_setpgrp = gdb_setpgid ();
if (debug_setpgrp == -1)
- perror("setpgrp failed in child");
-
-#ifdef SET_STACK_LIMIT_HUGE
- /* Reset the stack limit back to what it was. */
- {
- struct rlimit rlim;
-
- getrlimit (RLIMIT_STACK, &rlim);
- rlim.rlim_cur = original_stack_limit;
- setrlimit (RLIMIT_STACK, &rlim);
- }
-#endif /* SET_STACK_LIMIT_HUGE */
+ 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) ();
+ /* The call above set this process (the "child") as debuggable
+ * by the original gdb process (the "parent"). Since processes
+ * (unlike people) can have only one parent, if you are
+ * debugging gdb itself (and your debugger is thus _already_ the
+ * controller/parent for this child), code from here on out
+ * is undebuggable. Indeed, you probably got an error message
+ * saying "not parent". Sorry--you'll have to use print statements!
+ */
/* 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;
- execlp (shell_file, shell_file, "-c", shell_command, (char *)0);
- fprintf (stderr, "Cannot exec %s: %s.\n", shell_file,
- safe_strerror (errno));
- fflush (stderr);
- _exit (0177);
+ /* If we decided above to start up with a shell,
+ * we exec the shell,
+ * "-c" says to interpret the next arg as a shell command
+ * to execute, and this command is "exec <target-program> <args>".
+ * "-f" means "fast startup" to the c-shell, which means
+ * don't do .cshrc file. Doing .cshrc may cause fork/exec
+ * events which will confuse debugger start-up code.
+ */
+ if (shell)
+ {
+ execlp (shell_file, shell_file, "-c", shell_command, (char *) 0);
+
+ /* If we get here, it's an error */
+ fprintf_unfiltered (gdb_stderr, "Cannot exec %s: %s.\n", shell_file,
+ safe_strerror (errno));
+ gdb_flush (gdb_stderr);
+ _exit (0177);
+ }
+ else
+ {
+ /* Otherwise, we directly exec the target program with execvp. */
+ int i;
+ char *errstring;
+
+ execvp (exec_file, argv);
+
+ /* If we get here, it's an error */
+ errstring = safe_strerror (errno);
+ fprintf_unfiltered (gdb_stderr, "Cannot exec %s ", exec_file);
+
+ i = 1;
+ while (argv[i] != NULL)
+ {
+ if (i != 1)
+ fprintf_unfiltered (gdb_stderr, " ");
+ fprintf_unfiltered (gdb_stderr, "%s", argv[i]);
+ i++;
+ }
+ fprintf_unfiltered (gdb_stderr, ".\n");
+ /* This extra info seems to be useless
+ fprintf_unfiltered (gdb_stderr, "Got error %s.\n", errstring);
+ */
+ gdb_flush (gdb_stderr);
+ _exit (0177);
+ }
}
/* Restore our environment in case a vforked child clob'd it. */
environ = save_our_env;
- init_thread_list();
+ init_thread_list ();
+
+ inferior_ptid = pid_to_ptid (pid); /* Needed for wait_for_inferior stuff below */
/* Now that we have a child process, make it our target, and
initialize anything target-vector-specific that needs initializing. */
- (*init_trace_fun)(pid);
+
+ (*init_trace_fun) (pid);
+
+ /* We are now in the child process of interest, having exec'd the
+ correct program, and are poised at the first instruction of the
+ new program. */
+
+ /* Allow target dependent code to play with the new process. This might be
+ used to have target-specific code initialize a variable in the new process
+ prior to executing the first instruction. */
+ TARGET_CREATE_INFERIOR_HOOK (pid);
+
+#ifdef SOLIB_CREATE_INFERIOR_HOOK
+ SOLIB_CREATE_INFERIOR_HOOK (pid);
+#endif
+}
+
+/* Accept NTRAPS traps from the inferior. */
+
+void
+startup_inferior (int ntraps)
+{
+ int pending_execs = ntraps;
+ int terminal_initted;
/* The process was started by the fork that created it,
but it will have stopped one instruction after execing the shell.
Here we must get it up to actual execution of the real program. */
- inferior_pid = pid; /* Needed for wait_for_inferior stuff below */
-
clear_proceed_status ();
- /* We will get a trace trap after one instruction.
- Continue it automatically. Eventually (after shell does an exec)
- it will get another trace trap. Then insert breakpoints and continue. */
-
-#ifdef START_INFERIOR_TRAPS_EXPECTED
- pending_execs = START_INFERIOR_TRAPS_EXPECTED;
-#else
- pending_execs = 2;
-#endif
-
init_wait_for_inferior ();
terminal_initted = 0;
+ if (STARTUP_WITH_SHELL)
+ inferior_ignoring_startup_exec_events = ntraps;
+ else
+ inferior_ignoring_startup_exec_events = 0;
+ inferior_ignoring_leading_exec_events =
+ target_reported_exec_events_per_exec_call () - 1;
+
+#ifdef STARTUP_INFERIOR
+ STARTUP_INFERIOR (pending_execs);
+#else
while (1)
{
stop_soon_quietly = 1; /* Make wait_for_inferior be quiet */
wait_for_inferior ();
- if (stop_signal != SIGTRAP)
+ if (stop_signal != TARGET_SIGNAL_TRAP)
{
/* Let shell child handle its own signals in its own way */
/* FIXME, what if child has exit()ed? Must exit loop somehow */
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. */
terminal_initted = 1;
}
- if (0 == --pending_execs)
+
+ pending_execs = pending_execs - 1;
+ if (0 == pending_execs)
break;
- resume (0, 0); /* Just make it go on */
+
+ resume (0, TARGET_SIGNAL_0); /* Just make it go on */
}
}
+#endif /* STARTUP_INFERIOR */
stop_soon_quietly = 0;
-
- /* We are now in the child process of interest, having exec'd the
- correct program, and are poised at the first instruction of the
- new program. */
-#ifdef SOLIB_CREATE_INFERIOR_HOOK
- SOLIB_CREATE_INFERIOR_HOOK (pid);
-#endif
}
projects / deliverable / binutils-gdb.git / blobdiff