sysdeps/unix/sysv/linux/pause.c

   1 /* Linux pause syscall implementation.
   2    Copyright (C) 2017-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <signal.h>
  20 #include <unistd.h>
  21 #include <sysdep-cancel.h>
  22
  23 /* Suspend the process until a signal arrives.
  24    This always returns -1 and sets errno to EINTR.  */
  25 int
  26 __libc_pause (void)
  27 {
  28 #ifdef __NR_pause
  29   return SYSCALL_CANCEL (pause);
  30 #else
  31   return SYSCALL_CANCEL (ppoll, NULL, 0, NULL, NULL);
  32 #endif
  33 }
  34 weak_alias (__libc_pause, pause)