crash.c

   1 /* addr2line.c -- convert addresses to line number and function name
   2    Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
   3    2007, 2009  Free Software Foundation, Inc.
   4    Contributed by Ulrich Lauther <Ulrich.Lauther@mchp.siemens.de>
   5
   6    This file is part of GNU Binutils.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3, or (at your option)
  11    any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, 51 Franklin Street - Fifth Floor, Boston,
  21    MA 02110-1301, USA. */
  22
  23 #include "core.h"
  24
  25 #include <bfd.h>
  26
  27 sigjmp_buf crash_buf;
  28 static int crash_nsymbol;
  29 static void *crash_pointers[0x100];
  30 static char **crash_symbols;
  31 static unsigned crash_signal;
  32
  33 static void crash_handler(int sig, siginfo_t *si, void *ptr)
  34 {
  35         crash_nsymbol = backtrace(crash_pointers, sizeof(crash_pointers)/sizeof(void*));
  36         crash_signal = sig;
  37         siglongjmp(crash_buf, sig);
  38 }
  39
  40 void set_signals(unsigned activate)
  41 {
  42         int handle[] = { SIGABRT, SIGSEGV, SIGALRM };
  43         static struct sigaction oldsigs[sizeof(handle)/sizeof(*handle)];
  44         struct sigaction newsig;
  45         int i;
  46         newsig.sa_sigaction = crash_handler;
  47         sigemptyset(&newsig.sa_mask);
  48         newsig.sa_flags = SA_SIGINFO;
  49         if (!activate)
  50                 alarm(0);
  51         for (i = 0; i < sizeof(handle)/sizeof(*handle); ++i) {
  52                 if (activate)
  53                         sigaction(handle[i], &newsig, oldsigs + i);
  54                 else
  55                         sigaction(handle[i], oldsigs+i, NULL);
  56         }
  57         if (activate)
  58                 alarm(ALARM_TIME);
  59 }
  60
  61 void crash_write_backtrace(struct bio *b, const char *nick)
  62 {
  63         int i;
  64         b->writeline(b, "PRIVMSG %s :Signal %i", nick, crash_signal);
  65         for (i = 2; i < crash_nsymbol - 1; ++i)
  66                 b->writeline(b, "PRIVMSG %s :[%i] = %s", nick, i-2, crash_symbols[i]);
  67 }
  68
  69 void crash_mod(struct bio *b, const char *target)
  70 {
  71         if (ponify)
  72                 b->writeline(b, "PRIVMSG %s :{ Help! A%csistance is required! I believe there is something wrong with me! }", target, crash_signal == 6 ? 'S' : 's');
  73         else
  74                 b->writeline(b, "PRIVMSG %s :Signal %i caught", target, crash_signal);
  75         free(crash_symbols);
  76         crash_symbols = backtrace_symbols(crash_pointers, crash_nsymbol);
  77 }
  78
  79 void crash_init(void)
  80 {
  81 }
  82
  83 void crash_fini(void)
  84 {
  85         free(crash_symbols);
  86         crash_symbols = NULL;
  87 }