sysdeps/posix/sigpause.c

   1 /* Copyright (C) 1991-2024 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)