msdos/sigaction.c

   1 /* sigaction.c
   2  *
   3  * Copyright (C) 1995 DJ Delorie
   4  *
   5  * (See the README file in this directory for the copyright and license
   6  * history of this file.)
   7  *
   8  * This file 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 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This file 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 file.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21 #include <signal.h>
  22 #include <errno.h>
  23
  24 int
  25 sigaction(int _sig, const struct sigaction *_act, struct sigaction *_oact)
  26 {
  27   int retval = 0;
  28
  29   if (_oact)
  30   {
  31     void (*installed_sig)(int) = signal (_sig, SIG_IGN);
  32
  33     /* FIXME */
  34     if (installed_sig == SIG_ERR)
  35     {
  36       retval = -1;
  37       errno = EINVAL;
  38     }
  39     else
  40       signal (_sig, installed_sig);
  41     _oact->sa_handler = installed_sig;
  42     retval = sigemptyset (&_oact->sa_mask);
  43     _oact->sa_flags = 0;
  44   }
  45   if (_act)
  46   {
  47     if (signal (_sig, _act->sa_handler) == SIG_ERR)
  48     {
  49       retval = -1;
  50       errno = EINVAL;
  51     }
  52   }
  53   return 0;
  54 }
  55
  56
  57