release/src/router/glib/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 _MSC_VER
  63 #include <process.h>            /* For _getpid() */
  64 #endif
  65
  66 #ifndef NO_FD_SET
  67 #  define SELECT_MASK fd_set
  68 #else
  69 #  ifndef _AIX
  70      typedef long fd_mask;
  71 #  endif
  72 #  if defined(_IBMR2)
  73 #    define SELECT_MASK void
  74 #  else
  75 #    define SELECT_MASK int
  76 #  endif
  77 #endif
  78
  79
  80 static void stack_trace (char **args);
  81
  82 extern volatile gboolean glib_on_error_halt;
  83 volatile gboolean glib_on_error_halt = TRUE;
  84
  85 void
  86 g_on_error_query (const gchar *prg_name)
  87 {
  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 #ifndef NATIVE_WIN32
 115   if (isatty(0) && isatty(1))
 116     fgets (buf, 8, stdin);
 117   else
 118     strcpy (buf, "E\n");
 119 #else
 120   fgets (buf, 8, stdin);
 121 #endif
 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 }
 147
 148 void
 149 g_on_error_stack_trace (const gchar *prg_name)
 150 {
 151 #ifndef NATIVE_WIN32
 152   pid_t pid;
 153   gchar buf[16];
 154   gchar *args[4] = { "gdb", NULL, NULL, NULL };
 155
 156   if (!prg_name)
 157     return;
 158
 159   sprintf (buf, "%u", (guint) getpid ());
 160
 161   args[1] = (gchar*) prg_name;
 162   args[2] = buf;
 163
 164   pid = fork ();
 165   if (pid == 0)
 166     {
 167       stack_trace (args);
 168       _exit (0);
 169     }
 170   else if (pid == (pid_t) -1)
 171     {
 172       perror ("unable to fork gdb");
 173       return;
 174     }
 175
 176   while (glib_on_error_halt)
 177     ;
 178   glib_on_error_halt = TRUE;
 179 #else
 180   abort ();
 181 #endif
 182 }
 183
 184 static gboolean stack_trace_done = FALSE;
 185
 186 static void
 187 stack_trace_sigchld (int signum)
 188 {
 189   stack_trace_done = TRUE;
 190 }
 191
 192 static void
 193 stack_trace (char **args)
 194 {
 195 #ifndef NATIVE_WIN32
 196   pid_t pid;
 197   int in_fd[2];
 198   int out_fd[2];
 199   SELECT_MASK fdset;
 200   SELECT_MASK readset;
 201   struct timeval tv;
 202   int sel, index, state;
 203   char buffer[256];
 204   char c;
 205
 206   stack_trace_done = FALSE;
 207   signal (SIGCHLD, stack_trace_sigchld);
 208
 209   if ((pipe (in_fd) == -1) || (pipe (out_fd) == -1))
 210     {
 211       perror ("unable to open pipe");
 212       _exit (0);
 213     }
 214
 215   pid = fork ();
 216   if (pid == 0)
 217     {
 218       close (0); dup (in_fd[0]);   /* set the stdin to the in pipe */
 219       close (1); dup (out_fd[1]);  /* set the stdout to the out pipe */
 220       close (2); dup (out_fd[1]);  /* set the stderr to the out pipe */
 221
 222       execvp (args[0], args);      /* exec gdb */
 223       perror ("exec failed");
 224       _exit (0);
 225     }
 226   else if (pid == (pid_t) -1)
 227     {
 228       perror ("unable to fork");
 229       _exit (0);
 230     }
 231
 232   FD_ZERO (&fdset);
 233   FD_SET (out_fd[0], &fdset);
 234
 235   write (in_fd[1], "backtrace\n", 10);
 236   write (in_fd[1], "p x = 0\n", 8);
 237   write (in_fd[1], "quit\n", 5);
 238
 239   index = 0;
 240   state = 0;
 241
 242   while (1)
 243     {
 244       readset = fdset;
 245       tv.tv_sec = 1;
 246       tv.tv_usec = 0;
 247
 248       sel = select (FD_SETSIZE, &readset, NULL, NULL, &tv);
 249       if (sel == -1)
 250         break;
 251
 252       if ((sel > 0) && (FD_ISSET (out_fd[0], &readset)))
 253         {
 254           if (read (out_fd[0], &c, 1))
 255             {
 256               switch (state)
 257                 {
 258                 case 0:
 259                   if (c == '#')
 260                     {
 261                       state = 1;
 262                       index = 0;
 263                       buffer[index++] = c;
 264                     }
 265                   break;
 266                 case 1:
 267                   buffer[index++] = c;
 268                   if ((c == '\n') || (c == '\r'))
 269                     {
 270                       buffer[index] = 0;
 271                       fprintf (stdout, "%s", buffer);
 272                       state = 0;
 273                       index = 0;
 274                     }
 275                   break;
 276                 default:
 277                   break;
 278                 }
 279             }
 280         }
 281       else if (stack_trace_done)
 282         break;
 283     }
 284
 285   close (in_fd[0]);
 286   close (in_fd[1]);
 287   close (out_fd[0]);
 288   close (out_fd[1]);
 289   _exit (0);
 290 #else
 291   abort ();
 292 #endif
 293 }