summaryrefslogtreecommitdiff
path: root/sysdeps/posix/sigpause.c
blob: 414019a40d38b49faa11e1f3cfb6f59ddd620e42 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
/* Copyright (C) 1991, 92, 94, 95, 96, 97 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <errno.h>
#include <signal.h>

/* Set the mask of blocked signals to MASK,
   wait for a signal to arrive, and then restore the mask.  */
int
__sigpause (sig_or_mask, is_sig)
     int sig_or_mask;
     int is_sig;
{
  sigset_t set;
  int sig;

  if (is_sig != 0)
    {
      /* The modern X/Open implementation is requested.  */
      if (sigprocmask (0, NULL, &set) < 0
	  /* Yes, we call `sigdelset' and not `__sigdelset'.  */
	  || sigdelset (&set, sig_or_mask) < 0)
	return -1;
    }
  else
    {
      if (__sigemptyset (&set) < 0)
	return -1;

      if (sizeof (sig_or_mask) == sizeof (set))
	*(int *) &set = sig_or_mask;
      else if (sizeof (unsigned long int) == sizeof (set))
	*(unsigned long int *) &set = (unsigned int) sig_or_mask;
      else
	for (sig = 1; sig < NSIG; ++sig)
	  if ((sig_or_mask & sigmask (sig)) && __sigaddset (&set, sig) < 0)
	    return -1;
    }

  return sigsuspend (&set);
}


/* We have to provide a default version of this function since the
   standards demand it.  The version which is a bit more reasonable is
   the BSD version.  So make this the default.  */
int __default_sigpause __P ((int mask));
int
__default_sigpause (mask)
     int mask;
{
  return __sigpause (mask, 0);
}
#undef sigpause
weak_alias (__default_sigpause, sigpause)