glib/gbacktrace.c

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   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.
   8  *
   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.
  13  *
  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.
  18  */
  19
  20 /*
  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/.
  25  */
  26
  27 /*
  28  * MT safe ; except for g_on_error_stack_trace, but who wants thread safety
  29  * then
  30  */
  31
  32 #include "config.h"
  33
  34 #include <signal.h>
  35 #include <stdarg.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include "glib.h"
  39 #include "gprintfint.h"
  40
  41 #ifdef HAVE_SYS_TIME_H
  42 #include <sys/time.h>
  43 #endif
  44 #ifdef HAVE_SYS_TIMES_H
  45 #include <sys/times.h>
  46 #endif
  47 #include <sys/types.h>
  48 #ifdef HAVE_SYS_WAIT_H
  49 #include <sys/wait.h>
  50 #endif
  51
  52 #include <time.h>
  53 #ifdef HAVE_UNISTD_H
  54 #include <unistd.h>
  55 #endif
  56
  57 #ifdef HAVE_SYS_SELECT_H
  58 #include <sys/select.h>
  59 #endif /* HAVE_SYS_SELECT_H */
  60
  61 #include <string.h> /* for bzero on BSD systems */
  62
  63 #ifdef G_OS_WIN32
  64 #  define STRICT                /* Strict typing, please */
  65 #  define _WIN32_WINDOWS 0x0401 /* to get IsDebuggerPresent */
  66 #  include <windows.h>
  67 #  undef STRICT
  68 #endif
  69
  70 #ifndef NO_FD_SET
  71 #  define SELECT_MASK fd_set
  72 #else
  73 #  if defined(_IBMR2)
  74 #    define SELECT_MASK void
  75 #  else
  76 #    define SELECT_MASK int
  77 #  endif
  78 #endif
  79
  80 #include "galias.h"
  81
  82 #ifndef G_OS_WIN32
  83 static void stack_trace (char **args);
  84 #endif
  85
  86 extern volatile gboolean glib_on_error_halt;
  87 volatile gboolean glib_on_error_halt = TRUE;
  88
  89 void
  90 g_on_error_query (const gchar *prg_name)
  91 {
  92 #ifndef G_OS_WIN32
  93   static const gchar * const query1 = "[E]xit, [H]alt";
  94   static const gchar * const query2 = ", show [S]tack trace";
  95   static const gchar * const query3 = " or [P]roceed";
  96   gchar buf[16];
  97
  98   if (!prg_name)
  99     prg_name = g_get_prgname ();
 100
 101  retry:
 102
 103   if (prg_name)
 104     _g_fprintf (stdout,
 105                 "%s (pid:%u): %s%s%s: ",
 106                 prg_name,
 107                 (guint) getpid (),
 108                 query1,
 109                 query2,
 110                 query3);
 111   else
 112     _g_fprintf (stdout,
 113                 "(process:%u): %s%s: ",
 114                 (guint) getpid (),
 115                 query1,
 116                 query3);
 117   fflush (stdout);
 118
 119   if (isatty(0) && isatty(1))
 120     fgets (buf, 8, stdin);
 121   else
 122     strcpy (buf, "E\n");
 123
 124   if ((buf[0] == 'E' || buf[0] == 'e')
 125       && buf[1] == '\n')
 126     _exit (0);
 127   else if ((buf[0] == 'P' || buf[0] == 'p')
 128            && buf[1] == '\n')
 129     return;
 130   else if (prg_name
 131            && (buf[0] == 'S' || buf[0] == 's')
 132            && buf[1] == '\n')
 133     {
 134       g_on_error_stack_trace (prg_name);
 135       goto retry;
 136     }
 137   else if ((buf[0] == 'H' || buf[0] == 'h')
 138            && buf[1] == '\n')
 139     {
 140       while (glib_on_error_halt)
 141         ;
 142       glib_on_error_halt = TRUE;
 143       return;
 144     }
 145   else
 146     goto retry;
 147 #else
 148   if (!prg_name)
 149     prg_name = g_get_prgname ();
 150
 151   MessageBox (NULL, "g_on_error_query called, program terminating",
 152               (prg_name && *prg_name) ? prg_name : NULL,
 153               MB_OK|MB_ICONERROR);
 154   _exit(0);
 155 #endif
 156 }
 157
 158 void
 159 g_on_error_stack_trace (const gchar *prg_name)
 160 {
 161 #if defined(G_OS_UNIX) || defined(G_OS_BEOS)
 162   pid_t pid;
 163   gchar buf[16];
 164   gchar *args[4] = { "gdb", NULL, NULL, NULL };
 165   int status;
 166
 167   if (!prg_name)
 168     return;
 169
 170   _g_sprintf (buf, "%u", (guint) getpid ());
 171
 172   args[1] = (gchar*) prg_name;
 173   args[2] = buf;
 174
 175   pid = fork ();
 176   if (pid == 0)
 177     {
 178       stack_trace (args);
 179       _exit (0);
 180     }
 181   else if (pid == (pid_t) -1)
 182     {
 183       perror ("unable to fork gdb");
 184       return;
 185     }
 186
 187   waitpid (pid, &status, 0);
 188 #else
 189   if (IsDebuggerPresent ())
 190     G_BREAKPOINT ();
 191   else
 192     abort ();
 193 #endif
 194 }
 195
 196 #ifndef G_OS_WIN32
 197
 198 static gboolean stack_trace_done = FALSE;
 199
 200 static void
 201 stack_trace_sigchld (int signum)
 202 {
 203   stack_trace_done = TRUE;
 204 }
 205
 206 static void
 207 stack_trace (char **args)
 208 {
 209   pid_t pid;
 210   int in_fd[2];
 211   int out_fd[2];
 212   SELECT_MASK fdset;
 213   SELECT_MASK readset;
 214   struct timeval tv;
 215   int sel, index, state;
 216   char buffer[256];
 217   char c;
 218
 219   stack_trace_done = FALSE;
 220   signal (SIGCHLD, stack_trace_sigchld);
 221
 222   if ((pipe (in_fd) == -1) || (pipe (out_fd) == -1))
 223     {
 224       perror ("unable to open pipe");
 225       _exit (0);
 226     }
 227
 228   pid = fork ();
 229   if (pid == 0)
 230     {
 231       close (0); dup (in_fd[0]);   /* set the stdin to the in pipe */
 232       close (1); dup (out_fd[1]);  /* set the stdout to the out pipe */
 233       close (2); dup (out_fd[1]);  /* set the stderr to the out pipe */
 234
 235       execvp (args[0], args);      /* exec gdb */
 236       perror ("exec failed");
 237       _exit (0);
 238     }
 239   else if (pid == (pid_t) -1)
 240     {
 241       perror ("unable to fork");
 242       _exit (0);
 243     }
 244
 245   FD_ZERO (&fdset);
 246   FD_SET (out_fd[0], &fdset);
 247
 248   write (in_fd[1], "backtrace\n", 10);
 249   write (in_fd[1], "p x = 0\n", 8);
 250   write (in_fd[1], "quit\n", 5);
 251
 252   index = 0;
 253   state = 0;
 254
 255   while (1)
 256     {
 257       readset = fdset;
 258       tv.tv_sec = 1;
 259       tv.tv_usec = 0;
 260
 261       sel = select (FD_SETSIZE, &readset, NULL, NULL, &tv);
 262       if (sel == -1)
 263         break;
 264
 265       if ((sel > 0) && (FD_ISSET (out_fd[0], &readset)))
 266         {
 267           if (read (out_fd[0], &c, 1))
 268             {
 269               switch (state)
 270                 {
 271                 case 0:
 272                   if (c == '#')
 273                     {
 274                       state = 1;
 275                       index = 0;
 276                       buffer[index++] = c;
 277                     }
 278                   break;
 279                 case 1:
 280                   buffer[index++] = c;
 281                   if ((c == '\n') || (c == '\r'))
 282                     {
 283                       buffer[index] = 0;
 284                       _g_fprintf (stdout, "%s", buffer);
 285                       state = 0;
 286                       index = 0;
 287                     }
 288                   break;
 289                 default:
 290                   break;
 291                 }
 292             }
 293         }
 294       else if (stack_trace_done)
 295         break;
 296     }
 297
 298   close (in_fd[0]);
 299   close (in_fd[1]);
 300   close (out_fd[0]);
 301   close (out_fd[1]);
 302   _exit (0);
 303 }
 304
 305 #endif /* !G_OS_WIN32 */
 306
 307 #define __G_BACKTRACE_C__
 308 #include "galiasdef.c"