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))];
25 if ((uintptr_t)sa->sa_handler > 1UL) {
26 a_or_l(handler_set+(sig-1)/(8*sizeof(long)),
27 1UL<<(sig-1)%(8*sizeof(long)));
29 /* If pthread_create has not yet been called,
30 * implementation-internal signals might not
31 * yet have been unblocked. They must be
32 * unblocked before any signal handler is
33 * installed, so that an application cannot
34 * receive an illegal sigset_t (with them
35 * blocked) as part of the ucontext_t passed
36 * to the signal handler. */
37 if (!libc.threaded && !unmask_done) {
38 __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
39 SIGPT_SET, 0, _NSIG/8);
43 if (!(sa->sa_flags & SA_RESTART)) {
44 a_store(&__eintr_valid_flag, 1);
47 /* Changing the disposition of SIGABRT to anything but
48 * SIG_DFL requires a lock, so that it cannot be changed
49 * while abort is terminating the process after simply
50 * calling raise(SIGABRT) failed to do so. */
51 if (sa->sa_handler != SIG_DFL && sig == SIGABRT) {
52 __block_all_sigs(&set);
55 ksa.handler = sa->sa_handler;
56 ksa.flags = sa->sa_flags | SA_RESTORER;
57 ksa.restorer = (sa->sa_flags & SA_SIGINFO) ? __restore_rt : __restore;
58 memcpy(&ksa.mask, &sa->sa_mask, _NSIG/8);
60 int r = __syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa_old:0, _NSIG/8);
61 if (sig == SIGABRT && sa && sa->sa_handler != SIG_DFL) {
66 old->sa_handler = ksa_old.handler;
67 old->sa_flags = ksa_old.flags;
68 memcpy(&old->sa_mask, &ksa_old.mask, _NSIG/8);
70 return __syscall_ret(r);
73 int __sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
75 if (sig-32U < 3 || sig-1U >= _NSIG-1) {
79 return __libc_sigaction(sig, sa, old);
82 weak_alias(__sigaction, sigaction);