1/* Copyright (C) 1991-2016 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 <http://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#include <sysdep-cancel.h>
23#undef sigpause
24
25#include <sigset-cvt-mask.h>
26
27/* Set the mask of blocked signals to MASK,
28 wait for a signal to arrive, and then restore the mask. */
29static int
30do_sigpause (int sig_or_mask, int is_sig)
31{
32 sigset_t set;
33
34 if (is_sig != 0)
35 {
36 /* The modern X/Open implementation is requested. */
37 if (__sigprocmask (0, NULL, &set) < 0
38 || sigdelset (&set, sig_or_mask) < 0)
39 return -1;
40 }
41 else if (sigset_set_old_mask (&set, sig_or_mask) < 0)
42 return -1;
43
44 /* Note the sigpause() is a cancellation point. But since we call
45 sigsuspend() which itself is a cancellation point we do not have
46 to do anything here. */
47 return __sigsuspend (&set);
48}
49
50int
51__sigpause (int sig_or_mask, int is_sig)
52{
53 if (SINGLE_THREAD_P)
54 return do_sigpause (sig_or_mask, is_sig);
55
56 int oldtype = LIBC_CANCEL_ASYNC ();
57
58 int result = do_sigpause (sig_or_mask, is_sig);
59
60 LIBC_CANCEL_RESET (oldtype);
61
62 return result;
63}
64libc_hidden_def (__sigpause)
65
66/* We have to provide a default version of this function since the
67 standards demand it. The version which is a bit more reasonable is
68 the BSD version. So make this the default. */
69int
70__attribute__ ((weak))
71__default_sigpause (int mask)
72{
73 return __sigpause (mask, 0);
74}
75#undef sigpause
76weak_alias (__default_sigpause, sigpause)
77strong_alias (__default_sigpause, __libc_sigpause)
78
79
80/* We have to provide a default version of this function since the
81 standards demand it. The version which is a bit more reasonable is
82 the BSD version. So make this the default. */
83int
84__attribute__ ((weak))
85__xpg_sigpause (int sig)
86{
87 return __sigpause (sig, 1);
88}
89strong_alias (__xpg_sigpause, __libc___xpg_sigpause)
90