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
|
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include "syscall.h"
#include "pthread_impl.h"
void __restore(), __restore_rt();
int __libc_sigaction(int sig, const struct sigaction *sa, struct sigaction *old)
{
struct {
void *handler;
unsigned long flags;
void (*restorer)(void);
sigset_t mask;
} ksa, kold;
long pksa=0, pkold=0;
if (sa) {
ksa.handler = sa->sa_handler;
ksa.flags = sa->sa_flags | SA_RESTORER;
ksa.restorer = (sa->sa_flags & SA_SIGINFO) ? __restore_rt : __restore;
ksa.mask = sa->sa_mask;
pksa = (long)&ksa;
}
if (old) pkold = (long)&kold;
if (syscall4(__NR_rt_sigaction, sig, pksa, pkold, 8))
return -1;
if (old) {
old->sa_handler = kold.handler;
old->sa_flags = kold.flags;
old->sa_mask = kold.mask;
}
return 0;
}
int __sigaction(int sig, const struct sigaction *sa, struct sigaction *old)
{
if (sig == SIGCANCEL || sig == SIGSYSCALL) {
errno = EINVAL;
return -1;
}
return __libc_sigaction(sig, sa, old);
}
weak_alias(__sigaction, sigaction);
|
