5 #include "pthread_impl.h"
8 #include "ksigaction.h"
10 static int unmask_done
;
11 static unsigned long handler_set
[_NSIG
/(8*sizeof(long))];
13 void __get_handler_set(sigset_t
*set
)
15 memcpy(set
, handler_set
, sizeof handler_set
);
18 volatile int __eintr_valid_flag
;
20 int __libc_sigaction(int sig
, const struct sigaction
*restrict sa
, struct sigaction
*restrict old
)
22 struct k_sigaction ksa
, ksa_old
;
24 if ((uintptr_t)sa
->sa_handler
> 1UL) {
25 a_or_l(handler_set
+(sig
-1)/(8*sizeof(long)),
26 1UL<<(sig
-1)%(8*sizeof(long)));
28 /* If pthread_create has not yet been called,
29 * implementation-internal signals might not
30 * yet have been unblocked. They must be
31 * unblocked before any signal handler is
32 * installed, so that an application cannot
33 * receive an illegal sigset_t (with them
34 * blocked) as part of the ucontext_t passed
35 * to the signal handler. */
36 if (!libc
.threaded
&& !unmask_done
) {
37 __syscall(SYS_rt_sigprocmask
, SIG_UNBLOCK
,
38 SIGPT_SET
, 0, _NSIG
/8);
42 if (!(sa
->sa_flags
& SA_RESTART
)) {
43 a_store(&__eintr_valid_flag
, 1);
46 ksa
.handler
= sa
->sa_handler
;
47 ksa
.flags
= sa
->sa_flags
;
49 ksa
.flags
|= SA_RESTORER
;
50 ksa
.restorer
= (sa
->sa_flags
& SA_SIGINFO
) ? __restore_rt
: __restore
;
52 memcpy(&ksa
.mask
, &sa
->sa_mask
, _NSIG
/8);
54 int r
= __syscall(SYS_rt_sigaction
, sig
, sa
?&ksa
:0, old
?&ksa_old
:0, _NSIG
/8);
56 old
->sa_handler
= ksa_old
.handler
;
57 old
->sa_flags
= ksa_old
.flags
;
58 memcpy(&old
->sa_mask
, &ksa_old
.mask
, _NSIG
/8);
60 return __syscall_ret(r
);
63 int __sigaction(int sig
, const struct sigaction
*restrict sa
, struct sigaction
*restrict old
)
65 unsigned long set
[_NSIG
/(8*sizeof(long))];
67 if (sig
-32U < 3 || sig
-1U >= _NSIG
-1) {
72 /* Doing anything with the disposition of SIGABRT requires a lock,
73 * so that it cannot be changed while abort is terminating the
74 * process and so any change made by abort can't be observed. */
76 __block_all_sigs(&set
);
79 int r
= __libc_sigaction(sig
, sa
, old
);
87 weak_alias(__sigaction
, sigaction
);