summaryrefslogtreecommitdiff
path: root/src/signal/sigaction.c
blob: 1f09bb967c315fe0e26f62b0d43a694a8e9d24d9 (plain) (blame)
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 <string.h>
#include "syscall.h"
#include "pthread_impl.h"
#include "libc.h"
#include "ksigaction.h"

void __restore(), __restore_rt();

static pthread_t dummy(void) { return 0; }
weak_alias(dummy, __pthread_self_def);

int __libc_sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
{
	struct k_sigaction ksa, ksa_old;
	if (sa) {
		if ((uintptr_t)sa->sa_handler > 1UL)
			__pthread_self_def();
		ksa.handler = sa->sa_handler;
		ksa.flags = sa->sa_flags | SA_RESTORER;
		ksa.restorer = (sa->sa_flags & SA_SIGINFO) ? __restore_rt : __restore;
		memcpy(&ksa.mask, &sa->sa_mask, sizeof ksa.mask);
	}
	if (syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa_old:0, sizeof ksa.mask))
		return -1;
	if (old) {
		old->sa_handler = ksa_old.handler;
		old->sa_flags = ksa_old.flags;
		memcpy(&old->sa_mask, &ksa_old.mask, sizeof ksa_old.mask);
	}
	return 0;
}

int __sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
{
	if (sig-32U < 3) {
		errno = EINVAL;
		return -1;
	}
	return __libc_sigaction(sig, sa, old);
}

weak_alias(__sigaction, sigaction);