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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
/* POSIX compatible signal blocking for threads.
Copyright (C) 2011-2026 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <signal.h>
/* The native Windows implementation is defined in sigprocmask.c. */
#if !(defined _WIN32 && !defined __CYGWIN__)
# include <errno.h>
# include <stddef.h>
# if PTHREAD_SIGMASK_INEFFECTIVE
# include <string.h>
# endif
int
pthread_sigmask (int how, const sigset_t *new_mask, sigset_t *old_mask)
# undef pthread_sigmask
{
# if HAVE_PTHREAD_SIGMASK && !PTHREAD_SIGMASK_NOT_IN_LIBC
# if PTHREAD_SIGMASK_INEFFECTIVE
sigset_t omask;
sigset_t *old_mask_ptr = &omask;
sigemptyset (&omask);
/* Add a signal unlikely to be blocked, so that OMASK_COPY
is unlikely to match the actual mask. */
sigaddset (&omask, SIGILL);
sigset_t omask_copy;
memcpy (&omask_copy, &omask, sizeof omask);
# else
sigset_t *old_mask_ptr = old_mask;
# endif
int ret = pthread_sigmask (how, new_mask, old_mask_ptr);
# if PTHREAD_SIGMASK_INEFFECTIVE
if (ret == 0)
{
/* Detect whether pthread_sigmask is currently ineffective.
Don't cache the information: libpthread.so could be dynamically
loaded after the program started and after pthread_sigmask was
called for the first time. */
if (memeq (&omask_copy, &omask, sizeof omask)
&& pthread_sigmask (1729, &omask_copy, NULL) == 0)
{
/* pthread_sigmask is currently ineffective. The program is not
linked to -lpthread. So use sigprocmask instead. */
return (sigprocmask (how, new_mask, old_mask) < 0 ? errno : 0);
}
if (old_mask)
memcpy (old_mask, &omask, sizeof omask);
}
# endif
# if PTHREAD_SIGMASK_FAILS_WITH_ERRNO
if (ret == -1)
return errno;
# endif
return ret;
# else
int ret = sigprocmask (how, new_mask, old_mask);
/* Test for ret != 0, not ret < 0, as a workaround against NetBSD bug
<https://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=57213>. */
return (ret != 0 ? errno : 0);
# endif
}
#endif
|
