linux/sched/signal.h

1 /* SPDX-License-Identifier: GPL-2.0 */
12 #include <linux/posix-timers.h>
17  * Types defining task->signal and task->sighand and APIs using them:
28  * Per-process accounting stats:
60  * struct thread_group_cputimer - thread group interval timer counts
90 	/* current thread group signal load-balancing target: */
102 	 * - notify group_exit_task when ->count is equal to notify_count
103 	 * - everyone except group_exit_task is stopped during signal delivery
115 	 * manager, to re-parent orphan (double-forking) child processes
199 	 * getrlimit/setrlimit use task_lock(current->group_leader) to
200 	 * protect this instead of the siglock, because they really
206 	struct pacct_struct pacct;	/* per-process accounting information */
234 					 * updated during exec, and may have
261 	WARN_ON(sig->flags & (SIGNAL_GROUP_EXIT|SIGNAL_GROUP_COREDUMP));  in signal_set_stop_flags()
262 	sig->flags = (sig->flags & ~SIGNAL_STOP_MASK) | flags;  in signal_set_stop_flags()
265 /* If true, all threads except ->group_exit_task have pending SIGKILL */
268 	return	(sig->flags & SIGNAL_GROUP_EXIT) ||  in signal_group_exit()
269 		(sig->group_exit_task != NULL);  in signal_group_exit()
284 	spin_lock_irq(&task->sighand->siglock);  in kernel_dequeue_signal()
285 	ret = dequeue_signal(task, &task->blocked, &__info);  in kernel_dequeue_signal()
286 	spin_unlock_irq(&task->sighand->siglock);  in kernel_dequeue_signal()
293 	spin_lock_irq(&current->sighand->siglock);  in kernel_signal_stop()
294 	if (current->jobctl & JOBCTL_STOP_DEQUEUED)  in kernel_signal_stop()
296 	spin_unlock_irq(&current->sighand->siglock);  in kernel_signal_stop()
353 	return -ERESTARTNOINTR;  in restart_syscall()
363 	return unlikely(sigismember(&p->pending.signal, SIGKILL));  in __fatal_signal_pending()
399  * callers must hold sighand->siglock.
425  * set_restore_sigmask() - make sure saved_sigmask processing gets done
464 /* Higher-quality implementation, used if TIF_RESTORE_SIGMASK doesn't exist. */
467 	current->restore_sigmask = true;  in set_restore_sigmask()
471 	task->restore_sigmask = false;  in clear_tsk_restore_sigmask()
475 	current->restore_sigmask = false;  in clear_restore_sigmask()
479 	return current->restore_sigmask;  in test_restore_sigmask()
483 	return task->restore_sigmask;  in test_tsk_restore_sigmask()
487 	if (!current->restore_sigmask)  in test_and_clear_restore_sigmask()
489 	current->restore_sigmask = false;  in test_and_clear_restore_sigmask()
497 		__set_current_blocked(&current->saved_sigmask);  in restore_saved_sigmask()
512 	sigset_t *res = &current->blocked;  in sigmask_to_save()
514 		res = &current->saved_sigmask;  in sigmask_to_save()
541 	if (current->sas_ss_flags & SS_AUTODISARM)  in on_sig_stack()
545 	return sp >= current->sas_ss_sp &&  in on_sig_stack()
546 		sp - current->sas_ss_sp < current->sas_ss_size;  in on_sig_stack()
548 	return sp > current->sas_ss_sp &&  in on_sig_stack()
549 		sp - current->sas_ss_sp <= current->sas_ss_size;  in on_sig_stack()
555 	if (!current->sas_ss_size)  in sas_ss_flags()
563 	p->sas_ss_sp = 0;  in sas_ss_reset()
564 	p->sas_ss_size = 0;  in sas_ss_reset()
565 	p->sas_ss_flags = SS_DISABLE;  in sas_ss_reset()
570 	if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))  in sigsp()
572 		return current->sas_ss_sp;  in sigsp()
574 		return current->sas_ss_sp + current->sas_ss_size;  in sigsp()
586 	list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
595  *          'break' will not work as expected - use goto instead.
604 	list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)
607 	__for_each_thread((p)->signal, t)
623 		pid = task->signal->pids[type];  in task_pid_type()
629 	return task->signal->pids[PIDTYPE_TGID];  in task_tgid()
639 	return task->signal->pids[PIDTYPE_PGID];  in task_pgrp()
644 	return task->signal->pids[PIDTYPE_SID];  in task_session()
649 	return task->signal->nr_threads;  in get_nr_threads()
654 	return p->exit_signal >= 0;  in thread_group_leader()
660 	return p1->signal == p2->signal;  in same_thread_group()
665 	return list_entry_rcu(p->thread_group.next,  in next_thread()
671 	return list_empty(&p->thread_group);  in thread_group_empty()
688 	(void)__cond_lock(&task->sighand->siglock, ret);  in lock_task_sighand()
695 	spin_unlock_irqrestore(&task->sighand->siglock, *flags);  in unlock_task_sighand()
701 	return READ_ONCE(task->signal->rlim[limit].rlim_cur);  in task_rlimit()
707 	return READ_ONCE(task->signal->rlim[limit].rlim_max);  in task_rlimit_max()