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;
23 unsigned long set[_NSIG/(8*sizeof(long))];
24 /* Doing anything with the disposition of SIGABRT requires a lock,
25 * so that it cannot be changed while abort is terminating the
26 * process and so any change made by abort can't be observed. */
28 __block_all_sigs(&set);
32 if ((uintptr_t)sa->sa_handler > 1UL) {
33 a_or_l(handler_set+(sig-1)/(8*sizeof(long)),
34 1UL<<(sig-1)%(8*sizeof(long)));
36 /* If pthread_create has not yet been called,
37 * implementation-internal signals might not
38 * yet have been unblocked. They must be
39 * unblocked before any signal handler is
40 * installed, so that an application cannot
41 * receive an illegal sigset_t (with them
42 * blocked) as part of the ucontext_t passed
43 * to the signal handler. */
44 if (!libc.threaded && !unmask_done) {
45 __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
46 SIGPT_SET, 0, _NSIG/8);
50 if (!(sa->sa_flags & SA_RESTART)) {
51 a_store(&__eintr_valid_flag, 1);
54 ksa.handler = sa->sa_handler;
55 ksa.flags = sa->sa_flags | SA_RESTORER;
56 ksa.restorer = (sa->sa_flags & SA_SIGINFO) ? __restore_rt : __restore;
57 memcpy(&ksa.mask, &sa->sa_mask, _NSIG/8);
59 int r = __syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa_old:0, _NSIG/8);
65 old->sa_handler = ksa_old.handler;
66 old->sa_flags = ksa_old.flags;
67 memcpy(&old->sa_mask, &ksa_old.mask, _NSIG/8);
69 return __syscall_ret(r);
72 int __sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
74 if (sig-32U < 3 || sig-1U >= _NSIG-1) {
78 return __libc_sigaction(sig, sa, old);
81 weak_alias(__sigaction, sigaction);