sysdeps/unix/sysv/linux/sigaction.c

   1 /* Copyright (C) 1997 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 not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <signal.h>
  20
  21 /* The difference here is that the sigaction structure used in the
  22    kernel is not the same as we use in the libc.  Therefore we must
  23    translate it here.  */
  24 #include <kernel_sigaction.h>
  25
  26 extern int __syscall_sigaction (int, const struct kernel_sigaction *,
  27                                 struct kernel_sigaction *);
  28
  29 /* If ACT is not NULL, change the action for SIG to *ACT.
  30    If OACT is not NULL, put the old action for SIG in *OACT.  */
  31 int
  32 __sigaction (sig, act, oact)
  33      int sig;
  34      const struct sigaction *act;
  35      struct sigaction *oact;
  36 {
  37   struct kernel_sigaction k_sigact, k_osigact;
  38   int error;
  39
  40   if (act)
  41     {
  42       k_sigact.sa_handler = act->sa_handler;
  43       k_sigact.sa_mask = act->sa_mask.__val[0];
  44       k_sigact.sa_flags = act->sa_flags;
  45 #ifdef HAVE_SA_RESTORER
  46       k_sigact.sa_restorer = act->sa_restorer;
  47 #endif
  48     }
  49   error = __syscall_sigaction (sig, act ? &k_sigact : 0,
  50                                oact ? &k_osigact : 0);
  51   if (oact && error >= 0)
  52     {
  53       oact->sa_handler = k_osigact.sa_handler;
  54       oact->sa_mask.__val[0] = k_osigact.sa_mask;
  55       oact->sa_flags = k_osigact.sa_flags;
  56 #ifdef HAVE_SA_RESTORER
  57       oact->sa_restorer = k_osigact.sa_restorer;
  58 #endif
  59     }
  60   return error;
  61 }
  62
  63 weak_alias (__sigaction, sigaction)