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 <unistd.h>
      20  
      21  /* Schedule an alarm.  In SECONDS seconds, the process will get a SIGALRM.
      22     If SECONDS is zero, any currently scheduled alarm will be cancelled.
      23     The function returns the number of seconds remaining until the last
      24     alarm scheduled would have signaled, or zero if there wasn't one.
      25     There is no return value to indicate an error, but you can set `errno'
      26     to 0 and check its value after calling `alarm', and this might tell you.
      27     The signal may come late due to processor scheduling.  */
      28  unsigned int
      29  alarm (unsigned int seconds)
      30  {
      31    __set_errno (ENOSYS);
      32    return 0;
      33  }
      34  libc_hidden_def (alarm)
      35  
      36  stub_warning (alarm)