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)