linux/sched/signal.h

1 /* SPDX-License-Identifier: GPL-2.0 */
13 #include <linux/posix-timers.h>
18  * Types defining task->signal and task->sighand and APIs using them:
29  * Per-process accounting stats:
61  * struct thread_group_cputimer - thread group interval timer counts
103 	/* current thread group signal load-balancing target: */
126 	 * manager, to re-parent orphan (double-forking) child processes
210 	 * getrlimit/setrlimit use task_lock(current->group_leader) to
211 	 * protect this instead of the siglock, because they really
217 	struct pacct_struct pacct;	/* per-process accounting information */
245 						 * being updated during exec,
272 	WARN_ON(sig->flags & SIGNAL_GROUP_EXIT);  in signal_set_stop_flags()
273 	sig->flags = (sig->flags & ~SIGNAL_STOP_MASK) | flags;  in signal_set_stop_flags()
289 	spin_lock_irq(&task->sighand->siglock);  in kernel_dequeue_signal()
290 	ret = dequeue_signal(task, &task->blocked, &__info, &__type);  in kernel_dequeue_signal()
291 	spin_unlock_irq(&task->sighand->siglock);  in kernel_dequeue_signal()
298 	spin_lock_irq(&current->sighand->siglock);  in kernel_signal_stop()
299 	if (current->jobctl & JOBCTL_STOP_DEQUEUED) {  in kernel_signal_stop()
300 		current->jobctl |= JOBCTL_STOPPED;  in kernel_signal_stop()
303 	spin_unlock_irq(&current->sighand->siglock);  in kernel_signal_stop()
355  * user -> kernel to guarantee expedient run of TWA_SIGNAL based task_work.
376 	return -ERESTARTNOINTR;  in restart_syscall()
398 	return unlikely(sigismember(&p->pending.signal, SIGKILL));  in __fatal_signal_pending()
434  * callers must hold sighand->siglock.
444 	if (fatal && !(t->jobctl & JOBCTL_PTRACE_FROZEN)) {  in signal_wake_up()
445 		t->jobctl &= ~(JOBCTL_STOPPED | JOBCTL_TRACED);  in signal_wake_up()
454 		t->jobctl &= ~JOBCTL_TRACED;  in ptrace_signal_wake_up()
469  * set_restore_sigmask() - make sure saved_sigmask processing gets done
508 /* Higher-quality implementation, used if TIF_RESTORE_SIGMASK doesn't exist. */
511 	current->restore_sigmask = true;  in set_restore_sigmask()
515 	task->restore_sigmask = false;  in clear_tsk_restore_sigmask()
519 	current->restore_sigmask = false;  in clear_restore_sigmask()
523 	return current->restore_sigmask;  in test_restore_sigmask()
527 	return task->restore_sigmask;  in test_tsk_restore_sigmask()
531 	if (!current->restore_sigmask)  in test_and_clear_restore_sigmask()
533 	current->restore_sigmask = false;  in test_and_clear_restore_sigmask()
541 		__set_current_blocked(&current->saved_sigmask);  in restore_saved_sigmask()
556 	sigset_t *res = &current->blocked;  in sigmask_to_save()
558 		res = &current->saved_sigmask;  in sigmask_to_save()
574 	return sp >= current->sas_ss_sp &&  in __on_sig_stack()
575 		sp - current->sas_ss_sp < current->sas_ss_size;  in __on_sig_stack()
577 	return sp > current->sas_ss_sp &&  in __on_sig_stack()
578 		sp - current->sas_ss_sp <= current->sas_ss_size;  in __on_sig_stack()
596 	if (current->sas_ss_flags & SS_AUTODISARM)  in on_sig_stack()
604 	if (!current->sas_ss_size)  in sas_ss_flags()
612 	p->sas_ss_sp = 0;  in sas_ss_reset()
613 	p->sas_ss_size = 0;  in sas_ss_reset()
614 	p->sas_ss_flags = SS_DISABLE;  in sas_ss_reset()
619 	if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))  in sigsp()
621 		return current->sas_ss_sp;  in sigsp()
623 		return current->sas_ss_sp + current->sas_ss_size;  in sigsp()
635 	list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
643  * Without tasklist/siglock it is only rcu-safe if g can't exit/exec,
653 	list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node, \
657 	__for_each_thread((p)->signal, t)
673 		pid = task->signal->pids[type];  in task_pid_type()
679 	return task->signal->pids[PIDTYPE_TGID];  in task_tgid()
689 	return task->signal->pids[PIDTYPE_PGID];  in task_pgrp()
694 	return task->signal->pids[PIDTYPE_SID];  in task_session()
699 	return task->signal->nr_threads;  in get_nr_threads()
704 	return p->exit_signal >= 0;  in thread_group_leader()
710 	return p1->signal == p2->signal;  in same_thread_group()
718 	return list_next_or_null_rcu(&p->signal->thread_head,  in __next_thread()
719 					&p->thread_node,  in __next_thread()
726 	return __next_thread(p) ?: p->group_leader;  in next_thread()
732 	       list_is_last(&p->thread_node, &p->signal->thread_head);  in thread_group_empty()
749 	(void)__cond_lock(&task->sighand->siglock, ret);  in lock_task_sighand()
756 	spin_unlock_irqrestore(&task->sighand->siglock, *flags);  in unlock_task_sighand()
768 	return READ_ONCE(task->signal->rlim[limit].rlim_cur);  in task_rlimit()
774 	return READ_ONCE(task->signal->rlim[limit].rlim_max);  in task_rlimit_max()