signal/sysv_signal.c

   1 /* Copyright (C) 1991-2023 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    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <signal.h>
  20
  21 /* Set the handler for the signal SIG to HANDLER,
  22    returning the old handler, or SIG_ERR on error.  */
  23 __sighandler_t
  24 __sysv_signal (int sig, __sighandler_t handler)
  25 {
  26   /* Check signal extents to protect __sigismember.  */
  27   if (handler == SIG_ERR || sig < 1 || sig >= NSIG)
  28     {
  29       __set_errno (EINVAL);
  30       return SIG_ERR;
  31     }
  32
  33   __set_errno (ENOSYS);
  34
  35   return SIG_ERR;
  36 }
  37 weak_alias (__sysv_signal, sysv_signal)
  38
  39 stub_warning (sysv_signal)