85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
#include <signal.h>
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#include <errno.h>
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#include <string.h>
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#include "syscall.h"
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#include "pthread_impl.h"
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#include "libc.h"
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#include "lock.h"
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#include "ksigaction.h"
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static int unmask_done;
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static unsigned long handler_set[_NSIG/(8*sizeof(long))];
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void __get_handler_set(sigset_t *set)
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{
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memcpy(set, handler_set, sizeof handler_set);
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}
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volatile int __eintr_valid_flag;
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int __libc_sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
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{
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struct k_sigaction ksa, ksa_old;
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if (sa) {
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if ((uintptr_t)sa->sa_handler > 1UL) {
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a_or_l(handler_set+(sig-1)/(8*sizeof(long)),
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1UL<<(sig-1)%(8*sizeof(long)));
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/* If pthread_create has not yet been called,
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* implementation-internal signals might not
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* yet have been unblocked. They must be
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* unblocked before any signal handler is
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* installed, so that an application cannot
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* receive an illegal sigset_t (with them
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* blocked) as part of the ucontext_t passed
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* to the signal handler. */
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if (!libc.threaded && !unmask_done) {
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__syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
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SIGPT_SET, 0, _NSIG/8);
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unmask_done = 1;
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}
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if (!(sa->sa_flags & SA_RESTART)) {
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a_store(&__eintr_valid_flag, 1);
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}
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}
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ksa.handler = sa->sa_handler;
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ksa.flags = sa->sa_flags | SA_RESTORER;
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ksa.restorer = (sa->sa_flags & SA_SIGINFO) ? __restore_rt : __restore;
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memcpy(&ksa.mask, &sa->sa_mask, _NSIG/8);
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}
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int r = __syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa_old:0, _NSIG/8);
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if (old && !r) {
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old->sa_handler = ksa_old.handler;
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old->sa_flags = ksa_old.flags;
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memcpy(&old->sa_mask, &ksa_old.mask, _NSIG/8);
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}
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return __syscall_ret(r);
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}
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int __sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
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{
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unsigned long set[_NSIG/(8*sizeof(long))];
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if (sig-32U < 3 || sig-1U >= _NSIG-1) {
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errno = EINVAL;
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return -1;
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}
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/* Doing anything with the disposition of SIGABRT requires a lock,
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* so that it cannot be changed while abort is terminating the
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* process and so any change made by abort can't be observed. */
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if (sig == SIGABRT) {
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__block_all_sigs(&set);
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LOCK(__abort_lock);
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}
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int r = __libc_sigaction(sig, sa, old);
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if (sig == SIGABRT) {
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UNLOCK(__abort_lock);
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__restore_sigs(&set);
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}
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return r;
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}
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weak_alias(__sigaction, sigaction);
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