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
|
/*
* Copyright (C) 2004-2007 Atmel Corporation
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License. See the file "COPYING.LIB" in the main directory of this
* archive for more details.
*/
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <sys/syscall.h>
#include <bits/kernel_sigaction.h>
#define SA_RESTORER 0x04000000
extern void __default_rt_sa_restorer(void);
/* Experimentally off - libc_hidden_proto(memcpy) */
extern __typeof(sigaction) __libc_sigaction;
/*
* If act is not NULL, change the action for sig to *act.
* If oact is not NULL, put the old action for sig in *oact.
*/
int __libc_sigaction(int signum, const struct sigaction *act,
struct sigaction *oldact)
{
struct kernel_sigaction kact, koact;
int result;
enum {
SIGSET_MIN_SIZE = sizeof(kact.sa_mask) < sizeof(act->sa_mask)
? sizeof(kact.sa_mask) : sizeof(act->sa_mask)
};
if (act) {
kact.k_sa_handler = act->sa_handler;
memcpy(&kact.sa_mask, &act->sa_mask, SIGSET_MIN_SIZE);
kact.sa_flags = act->sa_flags;
if (kact.sa_flags & SA_RESTORER)
kact.sa_restorer = act->sa_restorer;
else
kact.sa_restorer = __default_rt_sa_restorer;
kact.sa_flags |= SA_RESTORER;
}
/* NB: kernel (as of 2.6.25) will return EINVAL
* if sizeof(kact.sa_mask) does not match kernel's sizeof(sigset_t) */
result = __syscall_rt_sigaction(signum,
act ? &kact : NULL,
oldact ? &koact : NULL,
sizeof(kact.sa_mask));
if (oldact && result >= 0) {
oldact->sa_handler = koact.k_sa_handler;
memcpy(&oldact->sa_mask, &koact.sa_mask, SIGSET_MIN_SIZE);
oldact->sa_flags = koact.sa_flags;
oldact->sa_restorer = koact.sa_restorer;
}
return result;
}
#ifndef LIBC_SIGACTION
/* libc_hidden_proto(sigaction) */
weak_alias(__libc_sigaction, sigaction)
libc_hidden_weak(sigaction)
#endif
|
