msdos/sigaction.c

   1 /* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
   2 #include <signal.h>
   3 #include <errno.h>
   4
   5 int
   6 sigaction(int _sig, const struct sigaction *_act, struct sigaction *_oact)
   7 {
   8   int retval = 0;
   9
  10   if (_oact)
  11   {
  12     void (*installed_sig)(int) = signal (_sig, SIG_IGN);
  13
  14     /* FIXME */
  15     if (installed_sig == SIG_ERR)
  16     {
  17       retval = -1;
  18       errno = EINVAL;
  19     }
  20     else
  21       signal (_sig, installed_sig);
  22     _oact->sa_handler = installed_sig;
  23     retval = sigemptyset (&_oact->sa_mask);
  24     _oact->sa_flags = 0;
  25   }
  26   if (_act)
  27   {
  28     if (signal (_sig, _act->sa_handler) == SIG_ERR)
  29     {
  30       retval = -1;
  31       errno = EINVAL;
  32     }
  33   }
  34   return 0;
  35 }
  36
  37
  38