src/leave-sigaltstack.c

   1 /* Leaving a signal handler executing on the alternate stack.
   2    Copyright (C) 2002-2003  Bruno Haible <bruno@clisp.org>
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 #include <stddef.h>
  19 #include <signal.h>
  20 #if HAVE_SYS_SIGNAL_H
  21 # include <sys/signal.h>
  22 #endif
  23
  24 /* For MacOSX.  */
  25 #ifndef SS_ONSTACK
  26 #define SS_ONSTACK SA_ONSTACK
  27 #endif
  28
  29 void
  30 sigsegv_reset_onstack_flag (void)
  31 {
  32   stack_t ss;
  33
  34   if (sigaltstack (NULL, &ss) >= 0)
  35     {
  36       ss.ss_flags &= ~SS_ONSTACK;
  37       sigaltstack (&ss, NULL);
  38     }
  39 }