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  #define sigpause __rename_sigpause
      19  #include <errno.h>
      20  #include <signal.h>
      21  #include <stddef.h>		/* For NULL.  */
      22  #undef sigpause
      23  
      24  #include <sigset-cvt-mask.h>
      25  #include <sysdep-cancel.h>
      26  
      27  int
      28  __sigpause (int sig_or_mask, int is_sig)
      29  {
      30    sigset_t set;
      31  
      32    if (is_sig != 0)
      33      {
      34        /* The modern X/Open implementation is requested.  */
      35        if (__sigprocmask (0, NULL, &set) < 0
      36  	  || sigdelset (&set, sig_or_mask) < 0)
      37  	return -1;
      38      }
      39    else if (sigset_set_old_mask (&set, sig_or_mask) < 0)
      40      return -1;
      41  
      42    /* Note the sigpause() is a cancellation point.  But since we call
      43       sigsuspend() which itself is a cancellation point we do not have
      44       to do anything here.  */
      45    return __sigsuspend (&set);
      46  }
      47  libc_hidden_def (__sigpause)
      48  
      49  /* We have to provide a default version of this function since the
      50     standards demand it.  The version which is a bit more reasonable is
      51     the BSD version.  So make this the default.  */
      52  int
      53  __attribute__ ((weak))
      54  __default_sigpause (int mask)
      55  {
      56    return __sigpause (mask, 0);
      57  }
      58  #undef sigpause
      59  weak_alias (__default_sigpause, sigpause)
      60  strong_alias (__default_sigpause, __libc_sigpause)
      61  
      62  
      63  /* We have to provide a default version of this function since the
      64     standards demand it.  The version which is a bit more reasonable is
      65     the BSD version.  So make this the default.  */
      66  int
      67  __attribute__ ((weak))
      68  __xpg_sigpause (int sig)
      69  {
      70    return __sigpause (sig, 1);
      71  }
      72  strong_alias (__xpg_sigpause, __libc___xpg_sigpause)