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