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