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 <signal.h>
      19  #include <time.h>
      20  #include <unistd.h>
      21  #include <errno.h>
      22  
      23  /* Make the process sleep for SECONDS seconds, or until a signal arrives
      24     and is not ignored.  The function returns the number of seconds less
      25     than SECONDS which it actually slept (zero if it slept the full time).
      26     If a signal handler does a `longjmp' or modifies the handling of the
      27     SIGALRM signal while inside `sleep' call, the handling of the SIGALRM
      28     signal afterwards is undefined.  There is no return value to indicate
      29     error, but if `sleep' returns SECONDS, it probably didn't work.  */
      30  unsigned int
      31  __sleep (unsigned int seconds)
      32  {
      33    __set_errno (ENOSYS);
      34    return seconds;
      35  }
      36  weak_alias (__sleep, sleep)
      37  
      38  stub_warning (sleep)