setjmp/sigjmp.c

   1 /* Copyright (C) 1992, 1994 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C 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 the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <stddef.h>
  21 #include <setjmp.h>
  22 #include <signal.h>
  23
  24 /* This function is called by the `sigsetjmp' macro
  25    before doing a `__setjmp' on ENV[0].__jmpbuf.
  26    Always return zero.  */
  27
  28 int
  29 DEFUN(__sigjmp_save, (env, savemask), sigjmp_buf env AND int savemask)
  30 {
  31   env[0].__mask_was_saved = (savemask &&
  32                              __sigprocmask (SIG_BLOCK, (sigset_t *) NULL,
  33                                             &env[0].__saved_mask) == 0);
  34
  35   return 0;
  36 }