gerror.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 Library 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  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library 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 1997-1999.  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 #ifdef HAVE_CONFIG_H
  33 #include <config.h>
  34 #endif
  35
  36 #include <signal.h>
  37 #include <stdarg.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include "glib.h"
  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 NATIVE_WIN32
  63 #  define STRICT                /* Strict typing, please */
  64 #  include <windows.h>
  65 #  include <process.h>          /* For _getpid() */
  66 #endif
  67
  68 #ifndef NO_FD_SET
  69 #  define SELECT_MASK fd_set
  70 #else
  71 #  if defined(_IBMR2)
  72 #    define SELECT_MASK void
  73 #  else
  74 #    define SELECT_MASK int
  75 #  endif
  76 #endif
  77
  78
  79 static void stack_trace (char **args);
  80
  81 extern volatile gboolean glib_on_error_halt;
  82 volatile gboolean glib_on_error_halt = TRUE;
  83
  84 void
  85 g_on_error_query (const gchar *prg_name)
  86 {
  87 #ifndef NATIVE_WIN32
  88   static const gchar *query1 = "[E]xit, [H]alt";
  89   static const gchar *query2 = ", show [S]tack trace";
  90   static const gchar *query3 = " or [P]roceed";
  91   gchar buf[16];
  92
  93   if (!prg_name)
  94     prg_name = g_get_prgname ();
  95
  96  retry:
  97
  98   if (prg_name)
  99     fprintf (stdout,
 100              "%s (pid:%u): %s%s%s: ",
 101              prg_name,
 102              (guint) getpid (),
 103              query1,
 104              query2,
 105              query3);
 106   else
 107     fprintf (stdout,
 108              "(process:%u): %s%s: ",
 109              (guint) getpid (),
 110              query1,
 111              query3);
 112   fflush (stdout);
 113
 114   fgets (buf, 8, stdin);
 115
 116   if ((buf[0] == 'E' || buf[0] == 'e')
 117       && buf[1] == '\n')
 118     _exit (0);
 119   else if ((buf[0] == 'P' || buf[0] == 'p')
 120            && buf[1] == '\n')
 121     return;
 122   else if (prg_name
 123            && (buf[0] == 'S' || buf[0] == 's')
 124            && buf[1] == '\n')
 125     {
 126       g_on_error_stack_trace (prg_name);
 127       goto retry;
 128     }
 129   else if ((buf[0] == 'H' || buf[0] == 'h')
 130            && buf[1] == '\n')
 131     {
 132       while (glib_on_error_halt)
 133         ;
 134       glib_on_error_halt = TRUE;
 135       return;
 136     }
 137   else
 138     goto retry;
 139 #else
 140   if (!prg_name)
 141     prg_name = g_get_prgname ();
 142
 143   MessageBox (NULL, "Terminating",
 144               (prg_name && *prg_name) ? prg_name : NULL,
 145               MB_OK|MB_ICONERROR);
 146   _exit(0);
 147 #endif
 148 }
 149
 150 void
 151 g_on_error_stack_trace (const gchar *prg_name)
 152 {
 153 #if !defined(NATIVE_WIN32) && ! defined(GLIB_NATIVE_BEOS)
 154   pid_t pid;
 155   gchar buf[16];
 156   gchar *args[4] = { "gdb", NULL, NULL, NULL };
 157
 158   if (!prg_name)
 159     return;
 160
 161   sprintf (buf, "%u", (guint) getpid ());
 162
 163   args[1] = (gchar*) prg_name;
 164   args[2] = buf;
 165
 166   pid = fork ();
 167   if (pid == 0)
 168     {
 169       stack_trace (args);
 170       _exit (0);
 171     }
 172   else if (pid == (pid_t) -1)
 173     {
 174       perror ("unable to fork gdb");
 175       return;
 176     }
 177
 178   while (glib_on_error_halt)
 179     ;
 180   glib_on_error_halt = TRUE;
 181 #else
 182   abort ();
 183 #endif
 184 }
 185
 186 static gboolean stack_trace_done = FALSE;
 187
 188 static void
 189 stack_trace_sigchld (int signum)
 190 {
 191   stack_trace_done = TRUE;
 192 }
 193
 194 static void
 195 stack_trace (char **args)
 196 {
 197 #if !defined(NATIVE_WIN32) && !defined(GLIB_NATIVE_BEOS)
 198   pid_t pid;
 199   int in_fd[2];
 200   int out_fd[2];
 201   SELECT_MASK fdset;
 202   SELECT_MASK readset;
 203   struct timeval tv;
 204   int sel, index, state;
 205   char buffer[256];
 206   char c;
 207
 208   stack_trace_done = FALSE;
 209   signal (SIGCHLD, stack_trace_sigchld);
 210
 211   if ((pipe (in_fd) == -1) || (pipe (out_fd) == -1))
 212     {
 213       perror ("unable to open pipe");
 214       _exit (0);
 215     }
 216
 217   pid = fork ();
 218   if (pid == 0)
 219     {
 220       close (0); dup (in_fd[0]);   /* set the stdin to the in pipe */
 221       close (1); dup (out_fd[1]);  /* set the stdout to the out pipe */
 222       close (2); dup (out_fd[1]);  /* set the stderr to the out pipe */
 223
 224       execvp (args[0], args);      /* exec gdb */
 225       perror ("exec failed");
 226       _exit (0);
 227     }
 228   else if (pid == (pid_t) -1)
 229     {
 230       perror ("unable to fork");
 231       _exit (0);
 232     }
 233
 234   FD_ZERO (&fdset);
 235   FD_SET (out_fd[0], &fdset);
 236
 237   write (in_fd[1], "backtrace\n", 10);
 238   write (in_fd[1], "p x = 0\n", 8);
 239   write (in_fd[1], "quit\n", 5);
 240
 241   index = 0;
 242   state = 0;
 243
 244   while (1)
 245     {
 246       readset = fdset;
 247       tv.tv_sec = 1;
 248       tv.tv_usec = 0;
 249
 250       sel = select (FD_SETSIZE, &readset, NULL, NULL, &tv);
 251       if (sel == -1)
 252         break;
 253
 254       if ((sel > 0) && (FD_ISSET (out_fd[0], &readset)))
 255         {
 256           if (read (out_fd[0], &c, 1))
 257             {
 258               switch (state)
 259                 {
 260                 case 0:
 261                   if (c == '#')
 262                     {
 263                       state = 1;
 264                       index = 0;
 265                       buffer[index++] = c;
 266                     }
 267                   break;
 268                 case 1:
 269                   buffer[index++] = c;
 270                   if ((c == '\n') || (c == '\r'))
 271                     {
 272                       buffer[index] = 0;
 273                       fprintf (stdout, "%s", buffer);
 274                       state = 0;
 275                       index = 0;
 276                     }
 277                   break;
 278                 default:
 279                   break;
 280                 }
 281             }
 282         }
 283       else if (stack_trace_done)
 284         break;
 285     }
 286
 287   close (in_fd[0]);
 288   close (in_fd[1]);
 289   close (out_fd[0]);
 290   close (out_fd[1]);
 291   _exit (0);
 292 #else
 293   abort ();
 294 #endif
 295 }