linux-master/kernel/signal.c

630 	int signr;
636 	signr = __dequeue_signal(&tsk->pending, mask, info, &resched_timer);
637 	if (!signr) {
639 		signr = __dequeue_signal(&tsk->signal->shared_pending,
655 		if (unlikely(signr == SIGALRM)) {
669 	if (!signr)
672 	if (unlikely(sig_kernel_stop(signr))) {
703 	return signr;
1251 static void print_fatal_signal(int signr)
1259 			exe_file, current->comm, signr);
1263 			current->comm, signr);
2384 static int ptrace_do_notify(int signr, int exit_code, int why, unsigned long message)
2389 	info.si_signo = signr;
2400 	int signr;
2407 	signr = ptrace_do_notify(SIGTRAP, exit_code, CLD_TRAPPED, message);
2409 	return signr;
2414  * @signr: signr causing group stop if initiating
2416  * If %JOBCTL_STOP_PENDING is not set yet, initiate group stop with @signr
2434 static bool do_signal_stop(int signr)
2443 		/* signr will be recorded in task->jobctl for retries */
2444 		WARN_ON_ONCE(signr & ~JOBCTL_STOP_SIGMASK);
2470 			sig->group_exit_code = signr;
2473 		if (task_set_jobctl_pending(current, signr | gstop))
2483 			    task_set_jobctl_pending(t, signr | gstop)) {
2555 	int signr = current->jobctl & JOBCTL_STOP_SIGMASK;
2560 			signr = SIGTRAP;
2561 		WARN_ON_ONCE(!signr);
2562 		ptrace_do_notify(signr, signr | (PTRACE_EVENT_STOP << 8),
2565 		WARN_ON_ONCE(!signr);
2566 		ptrace_stop(signr, CLD_STOPPED, 0, NULL);
2607 static int ptrace_signal(int signr, kernel_siginfo_t *info, enum pid_type type)
2610 	 * We do not check sig_kernel_stop(signr) but set this marker
2612 	 * change signr. This flag has no meaning unless we are going
2619 	signr = ptrace_stop(signr, CLD_TRAPPED, 0, info);
2622 	if (signr == 0)
2623 		return signr;
2631 	if (signr != info->si_signo) {
2633 		info->si_signo = signr;
2644 	if (sigismember(&current->blocked, signr) ||
2646 		send_signal_locked(signr, info, current, type);
2647 		signr = 0;
2650 	return signr;
2679 	int signr;
2744 			signr = SIGKILL;
2788 		signr = dequeue_synchronous_signal(&ksig->info);
2789 		if (!signr)
2790 			signr = dequeue_signal(current, &current->blocked,
2793 		if (!signr)
2796 		if (unlikely(current->ptrace) && (signr != SIGKILL) &&
2797 		    !(sighand->action[signr -1].sa.sa_flags & SA_IMMUTABLE)) {
2798 			signr = ptrace_signal(signr, &ksig->info, type);
2799 			if (!signr)
2803 		ka = &sighand->action[signr-1];
2806 		trace_signal_deliver(signr, &ksig->info, ka);
2817 			break; /* will return non-zero "signr" value */
2823 		if (sig_kernel_ignore(signr)) /* Default is nothing. */
2837 				!sig_kernel_only(signr))
2840 		if (sig_kernel_stop(signr)) {
2851 			if (signr != SIGSTOP) {
2862 			if (likely(do_signal_stop(signr))) {
2884 		if (sig_kernel_coredump(signr)) {
2886 				print_fatal_signal(signr);
2911 		do_group_exit(signr);
2916 	ksig->sig = signr;
2918 	if (signr && !(ksig->ka.sa.sa_flags & SA_EXPOSE_TAGBITS))
2921 	return signr > 0;