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 | SA_RESTORER;
48 ksa.restorer = (sa->sa_flags & SA_SIGINFO) ? __restore_rt : __restore;
49 memcpy(&ksa.mask, &sa->sa_mask, _NSIG/8);
51 int r = __syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa_old:0, _NSIG/8);
53 old->sa_handler = ksa_old.handler;
54 old->sa_flags = ksa_old.flags;
55 memcpy(&old->sa_mask, &ksa_old.mask, _NSIG/8);
57 return __syscall_ret(r);
60 int __sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
62 unsigned long set[_NSIG/(8*sizeof(long))];
64 if (sig-32U < 3 || sig-1U >= _NSIG-1) {
69 /* Doing anything with the disposition of SIGABRT requires a lock,
70 * so that it cannot be changed while abort is terminating the
71 * process and so any change made by abort can't be observed. */
73 __block_all_sigs(&set);
76 int r = __libc_sigaction(sig, sa, old);
84 weak_alias(__sigaction, sigaction);