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 */
69 #include "gbacktrace.h"
73 #include "gprintfint.h"
77 # define SELECT_MASK fd_set
80 # define SELECT_MASK void
82 # define SELECT_MASK int
88 static void stack_trace (char **args);
91 extern volatile gboolean glib_on_error_halt;
92 volatile gboolean glib_on_error_halt = TRUE;
96 * @prg_name: the program name, needed by <command>gdb</command>
97 * for the [S]tack trace option. If @prg_name is %NULL, g_get_prgname()
98 * is called to get the program name (which will work correctly if
99 * gdk_init() or gtk_init() has been called)
101 * Prompts the user with
102 * <computeroutput>[E]xit, [H]alt, show [S]tack trace or [P]roceed</computeroutput>.
103 * This function is intended to be used for debugging use only.
104 * The following example shows how it can be used together with
105 * the g_log() functions.
108 * #include <glib.h>
111 * log_handler (const gchar *log_domain,
112 * GLogLevelFlags log_level,
113 * const gchar *message,
114 * gpointer user_data)
116 * g_log_default_handler (log_domain, log_level, message, user_data);
118 * g_on_error_query (MY_PROGRAM_NAME);
122 * main (int argc, char *argv[])
124 * g_log_set_handler (MY_LOG_DOMAIN,
125 * G_LOG_LEVEL_WARNING |
126 * G_LOG_LEVEL_ERROR |
127 * G_LOG_LEVEL_CRITICAL,
133 * If [E]xit is selected, the application terminates with a call
134 * to <literal>_exit(0)</literal>.
136 * If [S]tack trace is selected, g_on_error_stack_trace() is called.
137 * This invokes <command>gdb</command>, which attaches to the current
138 * process and shows a stack trace. The prompt is then shown again.
140 * If [P]roceed is selected, the function returns.
142 * This function may cause different actions on non-UNIX platforms.
145 g_on_error_query (const gchar *prg_name)
148 static const gchar * const query1 = "[E]xit, [H]alt";
149 static const gchar * const query2 = ", show [S]tack trace";
150 static const gchar * const query3 = " or [P]roceed";
154 prg_name = g_get_prgname ();
160 "%s (pid:%u): %s%s%s: ",
168 "(process:%u): %s%s: ",
174 if (isatty(0) && isatty(1))
175 fgets (buf, 8, stdin);
179 if ((buf[0] == 'E' || buf[0] == 'e')
182 else if ((buf[0] == 'P' || buf[0] == 'p')
186 && (buf[0] == 'S' || buf[0] == 's')
189 g_on_error_stack_trace (prg_name);
192 else if ((buf[0] == 'H' || buf[0] == 'h')
195 while (glib_on_error_halt)
197 glib_on_error_halt = TRUE;
204 prg_name = g_get_prgname ();
206 MessageBox (NULL, "g_on_error_query called, program terminating",
207 (prg_name && *prg_name) ? prg_name : NULL,
214 * g_on_error_stack_trace:
215 * @prg_name: the program name, needed by <command>gdb</command>
216 * for the [S]tack trace option. If @prg_name is %NULL, g_get_prgname()
217 * is called to get the program name (which will work correctly if
218 * gdk_init() or gtk_init() has been called)
220 * Invokes <command>gdb</command>, which attaches to the current
221 * process and shows a stack trace. Called by g_on_error_query()
222 * when the [S]tack trace option is selected.
224 * This function may cause different actions on non-UNIX platforms.
227 g_on_error_stack_trace (const gchar *prg_name)
229 #if defined(G_OS_UNIX) || defined(G_OS_BEOS)
232 gchar *args[4] = { "gdb", NULL, NULL, NULL };
238 _g_sprintf (buf, "%u", (guint) getpid ());
240 args[1] = (gchar*) prg_name;
249 else if (pid == (pid_t) -1)
251 perror ("unable to fork gdb");
255 waitpid (pid, &status, 0);
257 if (IsDebuggerPresent ())
266 static gboolean stack_trace_done = FALSE;
269 stack_trace_sigchld (int signum)
271 stack_trace_done = TRUE;
275 stack_trace (char **args)
287 stack_trace_done = FALSE;
288 signal (SIGCHLD, stack_trace_sigchld);
290 if ((pipe (in_fd) == -1) || (pipe (out_fd) == -1))
292 perror ("unable to open pipe");
299 close (0); dup (in_fd[0]); /* set the stdin to the in pipe */
300 close (1); dup (out_fd[1]); /* set the stdout to the out pipe */
301 close (2); dup (out_fd[1]); /* set the stderr to the out pipe */
303 execvp (args[0], args); /* exec gdb */
304 perror ("exec failed");
307 else if (pid == (pid_t) -1)
309 perror ("unable to fork");
314 FD_SET (out_fd[0], &fdset);
316 write (in_fd[1], "backtrace\n", 10);
317 write (in_fd[1], "p x = 0\n", 8);
318 write (in_fd[1], "quit\n", 5);
329 sel = select (FD_SETSIZE, &readset, NULL, NULL, &tv);
333 if ((sel > 0) && (FD_ISSET (out_fd[0], &readset)))
335 if (read (out_fd[0], &c, 1))
349 if ((c == '\n') || (c == '\r'))
352 _g_fprintf (stdout, "%s", buffer);
362 else if (stack_trace_done)
373 #endif /* !G_OS_WIN32 */