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
  49 #include <time.h>
  50 #ifdef HAVE_UNISTD_H
  51 #include <unistd.h>
  52 #endif
  53
  54 #ifdef HAVE_SYS_SELECT_H
  55 #include <sys/select.h>
  56 #endif /* HAVE_SYS_SELECT_H */
  57
  58 #ifdef STDC_HEADERS
  59 #include <string.h> /* for bzero on BSD systems */
  60 #endif
  61
  62 #ifdef G_OS_WIN32
  63 #  define STRICT                /* Strict typing, please */
  64 #  define _WIN32_WINDOWS 0x0401 /* to get IsDebuggerPresent */
  65 #  include <windows.h>
  66 #  undef STRICT
  67 #endif
  68
  69 #ifndef NO_FD_SET
  70 #  define SELECT_MASK fd_set
  71 #else
  72 #  if defined(_IBMR2)
  73 #    define SELECT_MASK void
  74 #  else
  75 #    define SELECT_MASK int
  76 #  endif
  77 #endif
  78
  79 #include "galias.h"
  80
  81 #ifndef G_OS_WIN32
  82 static void stack_trace (char **args);
  83 #endif
  84
  85 extern volatile gboolean glib_on_error_halt;
  86 volatile gboolean glib_on_error_halt = TRUE;
  87
  88 void
  89 g_on_error_query (const gchar *prg_name)
  90 {
  91 #ifndef G_OS_WIN32
  92   static const gchar *query1 = "[E]xit, [H]alt";
  93   static const gchar *query2 = ", show [S]tack trace";
  94   static const gchar *query3 = " or [P]roceed";
  95   gchar buf[16];
  96
  97   if (!prg_name)
  98     prg_name = g_get_prgname ();
  99
 100  retry:
 101
 102   if (prg_name)
 103     _g_fprintf (stdout,
 104                 "%s (pid:%u): %s%s%s: ",
 105                 prg_name,
 106                 (guint) getpid (),
 107                 query1,
 108                 query2,
 109                 query3);
 110   else
 111     _g_fprintf (stdout,
 112                 "(process:%u): %s%s: ",
 113                 (guint) getpid (),
 114                 query1,
 115                 query3);
 116   fflush (stdout);
 117
 118   if (isatty(0) && isatty(1))
 119     fgets (buf, 8, stdin);
 120   else
 121     strcpy (buf, "E\n");
 122
 123   if ((buf[0] == 'E' || buf[0] == 'e')
 124       && buf[1] == '\n')
 125     _exit (0);
 126   else if ((buf[0] == 'P' || buf[0] == 'p')
 127            && buf[1] == '\n')
 128     return;
 129   else if (prg_name
 130            && (buf[0] == 'S' || buf[0] == 's')
 131            && buf[1] == '\n')
 132     {
 133       g_on_error_stack_trace (prg_name);
 134       goto retry;
 135     }
 136   else if ((buf[0] == 'H' || buf[0] == 'h')
 137            && buf[1] == '\n')
 138     {
 139       while (glib_on_error_halt)
 140         ;
 141       glib_on_error_halt = TRUE;
 142       return;
 143     }
 144   else
 145     goto retry;
 146 #else
 147   if (!prg_name)
 148     prg_name = g_get_prgname ();
 149
 150   MessageBox (NULL, "g_on_error_query called, program terminating",
 151               (prg_name && *prg_name) ? prg_name : NULL,
 152               MB_OK|MB_ICONERROR);
 153   _exit(0);
 154 #endif
 155 }
 156
 157 void
 158 g_on_error_stack_trace (const gchar *prg_name)
 159 {
 160 #ifdef G_OS_UNIX
 161   pid_t pid;
 162   gchar buf[16];
 163   gchar *args[4] = { "gdb", NULL, NULL, NULL };
 164
 165   if (!prg_name)
 166     return;
 167
 168   _g_sprintf (buf, "%u", (guint) getpid ());
 169
 170   args[1] = (gchar*) prg_name;
 171   args[2] = buf;
 172
 173   pid = fork ();
 174   if (pid == 0)
 175     {
 176       stack_trace (args);
 177       _exit (0);
 178     }
 179   else if (pid == (pid_t) -1)
 180     {
 181       perror ("unable to fork gdb");
 182       return;
 183     }
 184
 185   while (glib_on_error_halt)
 186     ;
 187   glib_on_error_halt = TRUE;
 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"