1  /* pause -- suspend the process until a signal arrives.  POSIX.1 version.
       2     Copyright (C) 2003-2023 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  #include <sigsetops.h>
      23  
      24  /* Suspend the process until a signal arrives.
      25     This always returns -1 and sets errno to EINTR.  */
      26  
      27  int
      28  __libc_pause (void)
      29  {
      30    sigset_t set;
      31  
      32    __sigemptyset (&set);
      33    __sigprocmask (SIG_BLOCK, NULL, &set);
      34  
      35    /* pause is a cancellation point, but so is sigsuspend.
      36       So no need for anything special here.  */
      37  
      38    return __sigsuspend (&set);
      39  }
      40  weak_alias (__libc_pause, pause)