/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
/*
* MT safe ; except for g_on_error_stack_trace, but who wants thread safety
* then
*/
#include "config.h"
#include "glibconfig.h"
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_TIMES_H
#include <sys/times.h>
#endif
#include <sys/types.h>
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include <time.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif /* HAVE_SYS_SELECT_H */
#include <string.h> /* for bzero on BSD systems */
#ifdef G_OS_WIN32
# define STRICT /* Strict typing, please */
# define _WIN32_WINDOWS 0x0401 /* to get IsDebuggerPresent */
# include <windows.h>
# undef STRICT
#endif
#include "gbacktrace.h"
#include "gtypes.h"
#include "gmain.h"
#include "gprintfint.h"
#include "gutils.h"
#ifndef NO_FD_SET
# define SELECT_MASK fd_set
#else
# if defined(_IBMR2)
# define SELECT_MASK void
# else
# define SELECT_MASK int
# endif
#endif
#ifndef G_OS_WIN32
static void stack_trace (char **args);
#endif
extern volatile gboolean glib_on_error_halt;
volatile gboolean glib_on_error_halt = TRUE;
/**
* g_on_error_query:
* @prg_name: the program name, needed by <command>gdb</command>
* for the [S]tack trace option. If @prg_name is %NULL, g_get_prgname()
* is called to get the program name (which will work correctly if
* gdk_init() or gtk_init() has been called)
*
* Prompts the user with
* <computeroutput>[E]xit, [H]alt, show [S]tack trace or [P]roceed</computeroutput>.
* This function is intended to be used for debugging use only.
* The following example shows how it can be used together with
* the g_log() functions.
*
* |[
* #include <glib.h>
*
* static void
* log_handler (const gchar *log_domain,
* GLogLevelFlags log_level,
* const gchar *message,
* gpointer user_data)
* {
* g_log_default_handler (log_domain, log_level, message, user_data);
*
* g_on_error_query (MY_PROGRAM_NAME);
* }
*
* int
* main (int argc, char *argv[])
* {
* g_log_set_handler (MY_LOG_DOMAIN,
* G_LOG_LEVEL_WARNING |
* G_LOG_LEVEL_ERROR |
* G_LOG_LEVEL_CRITICAL,
* log_handler,
* NULL);
* /* ... */
* ]|
*
* If [E]xit is selected, the application terminates with a call
* to <literal>_exit(0)</literal>.
*
* If [S]tack trace is selected, g_on_error_stack_trace() is called.
* This invokes <command>gdb</command>, which attaches to the current
* process and shows a stack trace. The prompt is then shown again.
*
* If [P]roceed is selected, the function returns.
*
* This function may cause different actions on non-UNIX platforms.
*/
void
g_on_error_query (const gchar *prg_name)
{
#ifndef G_OS_WIN32
static const gchar * const query1 = "[E]xit, [H]alt";
static const gchar * const query2 = ", show [S]tack trace";
static const gchar * const query3 = " or [P]roceed";
gchar buf[16];
if (!prg_name)
prg_name = g_get_prgname ();
retry:
if (prg_name)
_g_fprintf (stdout,
"%s (pid:%u): %s%s%s: ",
prg_name,
(guint) getpid (),
query1,
query2,
query3);
else
_g_fprintf (stdout,
"(process:%u): %s%s: ",
(guint) getpid (),
query1,
query3);
fflush (stdout);
if (isatty(0) && isatty(1))
fgets (buf, 8, stdin);
else
strcpy (buf, "E\n");
if ((buf[0] == 'E' || buf[0] == 'e')
&& buf[1] == '\n')
_exit (0);
else if ((buf[0] == 'P' || buf[0] == 'p')
&& buf[1] == '\n')
return;
else if (prg_name
&& (buf[0] == 'S' || buf[0] == 's')
&& buf[1] == '\n')
{
g_on_error_stack_trace (prg_name);
goto retry;
}
else if ((buf[0] == 'H' || buf[0] == 'h')
&& buf[1] == '\n')
{
while (glib_on_error_halt)
;
glib_on_error_halt = TRUE;
return;
}
else
goto retry;
#else
if (!prg_name)
prg_name = g_get_prgname ();
MessageBox (NULL, "g_on_error_query called, program terminating",
(prg_name && *prg_name) ? prg_name : NULL,
MB_OK|MB_ICONERROR);
_exit(0);
#endif
}
/**
* g_on_error_stack_trace:
* @prg_name: the program name, needed by <command>gdb</command>
* for the [S]tack trace option.
*
* Invokes <command>gdb</command>, which attaches to the current
* process and shows a stack trace. Called by g_on_error_query()
* when the [S]tack trace option is selected. You can get the current
* process's "program name" with g_get_prgname(), assuming that you
* have called gtk_init() or gdk_init().
*
* This function may cause different actions on non-UNIX platforms.
*/
void
g_on_error_stack_trace (const gchar *prg_name)
{
#if defined(G_OS_UNIX) || defined(G_OS_BEOS)
pid_t pid;
gchar buf[16];
gchar *args[4] = { "gdb", NULL, NULL, NULL };
int status;
if (!prg_name)
return;
_g_sprintf (buf, "%u", (guint) getpid ());
args[1] = (gchar*) prg_name;
args[2] = buf;
pid = fork ();
if (pid == 0)
{
stack_trace (args);
_exit (0);
}
else if (pid == (pid_t) -1)
{
perror ("unable to fork gdb");
return;
}
waitpid (pid, &status, 0);
#else
if (IsDebuggerPresent ())
G_BREAKPOINT ();
else
abort ();
#endif
}
#ifndef G_OS_WIN32
static gboolean stack_trace_done = FALSE;
static void
stack_trace_sigchld (int signum)
{
stack_trace_done = TRUE;
}
static void
stack_trace (char **args)
{
pid_t pid;
int in_fd[2];
int out_fd[2];
SELECT_MASK fdset;
SELECT_MASK readset;
struct timeval tv;
int sel, idx, state;
char buffer[256];
char c;
stack_trace_done = FALSE;
signal (SIGCHLD, stack_trace_sigchld);
if ((pipe (in_fd) == -1) || (pipe (out_fd) == -1))
{
perror ("unable to open pipe");
_exit (0);
}
pid = fork ();
if (pid == 0)
{
close (0); dup (in_fd[0]); /* set the stdin to the in pipe */
close (1); dup (out_fd[1]); /* set the stdout to the out pipe */
close (2); dup (out_fd[1]); /* set the stderr to the out pipe */
execvp (args[0], args); /* exec gdb */
perror ("exec failed");
_exit (0);
}
else if (pid == (pid_t) -1)
{
perror ("unable to fork");
_exit (0);
}
FD_ZERO (&fdset);
FD_SET (out_fd[0], &fdset);
write (in_fd[1], "backtrace\n", 10);
write (in_fd[1], "p x = 0\n", 8);
write (in_fd[1], "quit\n", 5);
idx = 0;
state = 0;
while (1)
{
readset = fdset;
tv.tv_sec = 1;
tv.tv_usec = 0;
sel = select (FD_SETSIZE, &readset, NULL, NULL, &tv);
if (sel == -1)
break;
if ((sel > 0) && (FD_ISSET (out_fd[0], &readset)))
{
if (read (out_fd[0], &c, 1))
{
switch (state)
{
case 0:
if (c == '#')
{
state = 1;
idx = 0;
buffer[idx++] = c;
}
break;
case 1:
buffer[idx++] = c;
if ((c == '\n') || (c == '\r'))
{
buffer[idx] = 0;
_g_fprintf (stdout, "%s", buffer);
state = 0;
idx = 0;
}
break;
default:
break;
}
}
}
else if (stack_trace_done)
break;
}
close (in_fd[0]);
close (in_fd[1]);
close (out_fd[0]);
close (out_fd[1]);
_exit (0);
}
#endif /* !G_OS_WIN32 */