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
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/* Copyright (C) 1997-2017 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 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.
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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <signal.h>
#define __need_NULL
#include <stddef.h>
#include <string.h>
#include <nptl/pthreadP.h>
#include <sysdep-cancel.h>
#include <sys/syscall.h>
#ifdef __NR_rt_sigtimedwait
/* Return any pending signal or wait for one for the given time. */
static int
do_sigwait (const sigset_t *set, int *sig)
{
int ret;
sigset_t tmpset;
if (set != NULL
&& (__builtin_expect (__sigismember (set, SIGCANCEL), 0)
|| __builtin_expect (__sigismember (set, SIGSETXID), 0)))
{
/* Create a temporary mask without the bit for SIGCANCEL set. */
// We are not copying more than we have to.
memcpy (&tmpset, set, _NSIG / 8);
__sigdelset (&tmpset, SIGCANCEL);
__sigdelset (&tmpset, SIGSETXID);
set = &tmpset;
}
/* XXX The size argument hopefully will have to be changed to the
real size of the user-level sigset_t. */
#ifdef INTERNAL_SYSCALL
INTERNAL_SYSCALL_DECL (err);
do
ret = INTERNAL_SYSCALL (rt_sigtimedwait, err, 4, set,
NULL, NULL, _NSIG / 8);
while (INTERNAL_SYSCALL_ERROR_P (ret, err)
&& INTERNAL_SYSCALL_ERRNO (ret, err) == EINTR);
if (! INTERNAL_SYSCALL_ERROR_P (ret, err))
{
*sig = ret;
ret = 0;
}
else
ret = INTERNAL_SYSCALL_ERRNO (ret, err);
#else
do
ret = INLINE_SYSCALL (rt_sigtimedwait, 4, set, NULL, NULL, _NSIG / 8);
while (ret == -1 && errno == EINTR);
if (ret != -1)
{
*sig = ret;
ret = 0;
}
else
ret = errno;
#endif
return ret;
}
int
__sigwait (const sigset_t *set, int *sig)
{
if (SINGLE_THREAD_P)
return do_sigwait (set, sig);
int oldtype = LIBC_CANCEL_ASYNC ();
int result = do_sigwait (set, sig);
LIBC_CANCEL_RESET (oldtype);
return result;
}
libc_hidden_def (__sigwait)
weak_alias (__sigwait, sigwait)
#else
# include <sysdeps/posix/sigwait.c>
#endif
strong_alias (__sigwait, __libc_sigwait)
|
