signal/sigaction.c

   1 /* Copyright (C) 1991-2019 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <signal.h>
  20
  21
  22 /* If ACT is not NULL, change the action for SIG to *ACT.
  23    If OACT is not NULL, put the old action for SIG in *OACT.  */
  24 int
  25 __sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
  26 {
  27   if (sig <= 0 || sig >= NSIG || __is_internal_signal (sig))
  28     {
  29       __set_errno (EINVAL);
  30       return -1;
  31     }
  32
  33   __set_errno (ENOSYS);
  34   return -1;
  35 }
  36 libc_hidden_def (__sigaction)
  37 stub_warning (sigaction)
  38
  39 weak_alias (__sigaction, sigaction)