5 #include "pthread_impl.h"
7 #include "ksigaction.h"
9 volatile int dummy_lock[1] = { 0 };
11 __attribute__((__visibility__("hidden")))
12 weak_alias(dummy_lock, __abort_lock);
14 static int unmask_done;
15 static unsigned long handler_set[_NSIG/(8*sizeof(long))];
17 void __get_handler_set(sigset_t *set)
19 memcpy(set, handler_set, sizeof handler_set);
22 int __libc_sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
24 struct k_sigaction ksa, ksa_old;
25 unsigned long set[_NSIG/(8*sizeof(long))];
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 /* Changing the disposition of SIGABRT to anything but
46 * SIG_DFL requires a lock, so that it cannot be changed
47 * while abort is terminating the process after simply
48 * calling raise(SIGABRT) failed to do so. */
49 if (sa->sa_handler != SIG_DFL && sig == SIGABRT) {
50 __block_all_sigs(&set);
53 ksa.handler = sa->sa_handler;
54 ksa.flags = sa->sa_flags | SA_RESTORER;
55 ksa.restorer = (sa->sa_flags & SA_SIGINFO) ? __restore_rt : __restore;
56 memcpy(&ksa.mask, &sa->sa_mask, _NSIG/8);
58 int r = __syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa_old:0, _NSIG/8);
59 if (sig == SIGABRT && sa && sa->sa_handler != SIG_DFL) {
64 old->sa_handler = ksa_old.handler;
65 old->sa_flags = ksa_old.flags;
66 memcpy(&old->sa_mask, &ksa_old.mask, _NSIG/8);
68 return __syscall_ret(r);
71 int __sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
73 if (sig-32U < 3 || sig-1U >= _NSIG-1) {
77 return __libc_sigaction(sig, sa, old);
80 weak_alias(__sigaction, sigaction);