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
|
/* Copyright (C) 1997-2001,2003,2004 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <signal.h>
#include <string.h> /* Neede for string function builtin redirection. */
#include <unistd.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <bp-checks.h>
#include "kernel-features.h"
/* The variable is shared between all wrappers around signal handling
functions which have RT equivalents. The definition is in sigaction.c. */
extern int __libc_missing_rt_sigs;
/* Get and/or change the set of blocked signals. */
int
__sigprocmask (how, set, oset)
int how;
const sigset_t *set;
sigset_t *oset;
{
#ifdef SIGCANCEL
sigset_t local_newmask;
/* The only thing we have to make sure here is that SIGCANCEL and
SIGSETXID are not blocked. */
if (set != NULL
&& (__builtin_expect (__sigismember (set, SIGCANCEL), 0)
# ifdef SIGSETXID
|| __builtin_expect (__sigismember (set, SIGSETXID), 0)
# endif
))
{
local_newmask = *set;
__sigdelset (&local_newmask, SIGCANCEL);
# ifdef SIGSETXID
__sigdelset (&local_newmask, SIGSETXID);
# endif
set = &local_newmask;
}
#endif
#if __ASSUME_REALTIME_SIGNALS > 0
return INLINE_SYSCALL (rt_sigprocmask, 4, how, CHECK_SIGSET_NULL_OK (set),
CHECK_SIGSET_NULL_OK (oset), _NSIG / 8);
#else
# ifdef __NR_rt_sigprocmask
/* First try the RT signals. */
if (!__libc_missing_rt_sigs)
{
/* XXX The size argument hopefully will have to be changed to the
real size of the user-level sigset_t. */
int saved_errno = errno;
int result = INLINE_SYSCALL (rt_sigprocmask, 4, how,
CHECK_SIGSET_NULL_OK (set),
CHECK_SIGSET_NULL_OK (oset), _NSIG / 8);
if (result >= 0 || errno != ENOSYS)
return result;
__set_errno (saved_errno);
__libc_missing_rt_sigs = 1;
}
# endif
return INLINE_SYSCALL (sigprocmask, 3, how, CHECK_SIGSET_NULL_OK (set),
CHECK_SIGSET_NULL_OK (oset));
#endif
}
weak_alias (__sigprocmask, sigprocmask)
|
