5 #include "pthread_impl.h"
7 #include "ksigaction.h"
9 static int unmask_done
;
10 static unsigned long handler_set
[_NSIG
/(8*sizeof(long))];
12 void __get_handler_set(sigset_t
*set
)
14 memcpy(set
, handler_set
, sizeof handler_set
);
17 int __libc_sigaction(int sig
, const struct sigaction
*restrict sa
, struct sigaction
*restrict old
)
19 struct k_sigaction ksa
, ksa_old
;
21 if ((uintptr_t)sa
->sa_handler
> 1UL) {
22 a_or_l(handler_set
+(sig
-1)/(8*sizeof(long)),
23 1UL<<(sig
-1)%(8*sizeof(long)));
25 /* If pthread_create has not yet been called,
26 * implementation-internal signals might not
27 * yet have been unblocked. They must be
28 * unblocked before any signal handler is
29 * installed, so that an application cannot
30 * receive an illegal sigset_t (with them
31 * blocked) as part of the ucontext_t passed
32 * to the signal handler. */
33 if (!libc
.threaded
&& !unmask_done
) {
34 __syscall(SYS_rt_sigprocmask
, SIG_UNBLOCK
,
35 SIGPT_SET
, 0, _NSIG
/8);
39 ksa
.handler
= sa
->sa_handler
;
40 ksa
.flags
= sa
->sa_flags
| SA_RESTORER
;
41 ksa
.restorer
= (sa
->sa_flags
& SA_SIGINFO
) ? __restore_rt
: __restore
;
42 memcpy(&ksa
.mask
, &sa
->sa_mask
, sizeof ksa
.mask
);
44 if (syscall(SYS_rt_sigaction
, sig
, sa
?&ksa
:0, old
?&ksa_old
:0, sizeof ksa
.mask
))
47 old
->sa_handler
= ksa_old
.handler
;
48 old
->sa_flags
= ksa_old
.flags
;
49 memcpy(&old
->sa_mask
, &ksa_old
.mask
, sizeof ksa_old
.mask
);
54 int __sigaction(int sig
, const struct sigaction
*restrict sa
, struct sigaction
*restrict old
)
56 if (sig
-32U < 3 || sig
-1U >= _NSIG
-1) {
60 return __libc_sigaction(sig
, sa
, old
);
63 weak_alias(__sigaction
, sigaction
);