1 /* GLIB - Library of useful routines for C programming
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 * Modified by the GLib Team and others 1997-2000. See the AUTHORS
22 * file for a list of people on the GLib Team. See the ChangeLog
23 * files for a list of changes. These files are distributed with
24 * GLib at ftp://ftp.gtk.org/pub/gtk/.
28 * MT safe ; except for g_on_error_stack_trace, but who wants thread safety
33 #include "glibconfig.h"
40 #ifdef HAVE_SYS_TIME_H
43 #ifdef HAVE_SYS_TIMES_H
44 #include <sys/times.h>
46 #include <sys/types.h>
47 #ifdef HAVE_SYS_WAIT_H
56 #ifdef HAVE_SYS_SELECT_H
57 #include <sys/select.h>
58 #endif /* HAVE_SYS_SELECT_H */
60 #include <string.h> /* for bzero on BSD systems */
63 # define STRICT /* Strict typing, please */
64 # define _WIN32_WINDOWS 0x0401 /* to get IsDebuggerPresent */
71 #include "gbacktrace.h"
75 #include "gprintfint.h"
80 # define SELECT_MASK fd_set
83 # define SELECT_MASK void
85 # define SELECT_MASK int
91 static void stack_trace (char **args);
94 /* People want to hit this from their debugger... */
95 GLIB_AVAILABLE_IN_ALL volatile gboolean glib_on_error_halt;
96 volatile gboolean glib_on_error_halt = TRUE;
100 * @prg_name: the program name, needed by <command>gdb</command>
101 * for the [S]tack trace option. If @prg_name is %NULL, g_get_prgname()
102 * is called to get the program name (which will work correctly if
103 * gdk_init() or gtk_init() has been called)
105 * Prompts the user with
106 * <computeroutput>[E]xit, [H]alt, show [S]tack trace or [P]roceed</computeroutput>.
107 * This function is intended to be used for debugging use only.
108 * The following example shows how it can be used together with
109 * the g_log() functions.
112 * #include <glib.h>
115 * log_handler (const gchar *log_domain,
116 * GLogLevelFlags log_level,
117 * const gchar *message,
118 * gpointer user_data)
120 * g_log_default_handler (log_domain, log_level, message, user_data);
122 * g_on_error_query (MY_PROGRAM_NAME);
126 * main (int argc, char *argv[])
128 * g_log_set_handler (MY_LOG_DOMAIN,
129 * G_LOG_LEVEL_WARNING |
130 * G_LOG_LEVEL_ERROR |
131 * G_LOG_LEVEL_CRITICAL,
137 * If [E]xit is selected, the application terminates with a call
138 * to <literal>_exit(0)</literal>.
140 * If [S]tack trace is selected, g_on_error_stack_trace() is called.
141 * This invokes <command>gdb</command>, which attaches to the current
142 * process and shows a stack trace. The prompt is then shown again.
144 * If [P]roceed is selected, the function returns.
146 * This function may cause different actions on non-UNIX platforms.
149 g_on_error_query (const gchar *prg_name)
152 static const gchar * const query1 = "[E]xit, [H]alt";
153 static const gchar * const query2 = ", show [S]tack trace";
154 static const gchar * const query3 = " or [P]roceed";
158 prg_name = g_get_prgname ();
164 "%s (pid:%u): %s%s%s: ",
172 "(process:%u): %s%s: ",
178 if (isatty(0) && isatty(1))
179 fgets (buf, 8, stdin);
183 if ((buf[0] == 'E' || buf[0] == 'e')
186 else if ((buf[0] == 'P' || buf[0] == 'p')
190 && (buf[0] == 'S' || buf[0] == 's')
193 g_on_error_stack_trace (prg_name);
196 else if ((buf[0] == 'H' || buf[0] == 'h')
199 while (glib_on_error_halt)
201 glib_on_error_halt = TRUE;
208 prg_name = g_get_prgname ();
210 MessageBox (NULL, "g_on_error_query called, program terminating",
211 (prg_name && *prg_name) ? prg_name : NULL,
218 * g_on_error_stack_trace:
219 * @prg_name: the program name, needed by <command>gdb</command>
220 * for the [S]tack trace option.
222 * Invokes <command>gdb</command>, which attaches to the current
223 * process and shows a stack trace. Called by g_on_error_query()
224 * when the [S]tack trace option is selected. You can get the current
225 * process's "program name" with g_get_prgname(), assuming that you
226 * have called gtk_init() or gdk_init().
228 * This function may cause different actions on non-UNIX platforms.
231 g_on_error_stack_trace (const gchar *prg_name)
233 #if defined(G_OS_UNIX) || defined(G_OS_BEOS)
236 gchar *args[4] = { "gdb", NULL, NULL, NULL };
242 _g_sprintf (buf, "%u", (guint) getpid ());
244 args[1] = (gchar*) prg_name;
253 else if (pid == (pid_t) -1)
255 perror ("unable to fork gdb");
259 waitpid (pid, &status, 0);
261 if (IsDebuggerPresent ())
270 static gboolean stack_trace_done = FALSE;
273 stack_trace_sigchld (int signum)
275 stack_trace_done = TRUE;
279 stack_trace (char **args)
291 stack_trace_done = FALSE;
292 signal (SIGCHLD, stack_trace_sigchld);
294 if ((pipe (in_fd) == -1) || (pipe (out_fd) == -1))
296 perror ("unable to open pipe");
303 /* Save stderr for printing failure below */
304 int old_err = dup (2);
305 fcntl (old_err, F_SETFD, fcntl (old_err, F_GETFD) | FD_CLOEXEC);
307 close (0); dup (in_fd[0]); /* set the stdin to the in pipe */
308 close (1); dup (out_fd[1]); /* set the stdout to the out pipe */
309 close (2); dup (out_fd[1]); /* set the stderr to the out pipe */
311 execvp (args[0], args); /* exec gdb */
313 /* Print failure to original stderr */
314 close (2); dup (old_err);
315 perror ("exec gdb failed");
318 else if (pid == (pid_t) -1)
320 perror ("unable to fork");
325 FD_SET (out_fd[0], &fdset);
327 write (in_fd[1], "backtrace\n", 10);
328 write (in_fd[1], "p x = 0\n", 8);
329 write (in_fd[1], "quit\n", 5);
340 sel = select (FD_SETSIZE, &readset, NULL, NULL, &tv);
344 if ((sel > 0) && (FD_ISSET (out_fd[0], &readset)))
346 if (read (out_fd[0], &c, 1))
360 if ((c == '\n') || (c == '\r'))
363 _g_fprintf (stdout, "%s", buffer);
373 else if (stack_trace_done)
384 #endif /* !G_OS_WIN32 */