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, or (at your option)
  11  * 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; see the file COPYING.  If not, write to
  20  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21  * Boston, MA 02110-1301, USA.
  22  */
  23 #include <signal.h>
  24 #include <errno.h>
  25
  26 int
  27 sigaction(int _sig, const struct sigaction *_act, struct sigaction *_oact)
  28 {
  29   int retval = 0;
  30
  31   if (_oact)
  32   {
  33     void (*installed_sig)(int) = signal (_sig, SIG_IGN);
  34
  35     /* FIXME */
  36     if (installed_sig == SIG_ERR)
  37     {
  38       retval = -1;
  39       errno = EINVAL;
  40     }
  41     else
  42       signal (_sig, installed_sig);
  43     _oact->sa_handler = installed_sig;
  44     retval = sigemptyset (&_oact->sa_mask);
  45     _oact->sa_flags = 0;
  46   }
  47   if (_act)
  48   {
  49     if (signal (_sig, _act->sa_handler) == SIG_ERR)
  50     {
  51       retval = -1;
  52       errno = EINVAL;
  53     }
  54   }
  55   return 0;
  56 }
  57
  58
  59
  60 /* arch-tag: 39526405-3d3a-44fe-af28-82a515e0c8e8
  61    (do not change this comment) */