Commit 69f032c9 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

signal: Provide ignored_posix_timers list 



To prepare for handling posix timer signals on sigaction(SIG_IGN) properly,
add a list to task::signal.

This list will be used to queue posix timers so their signal can be
requeued when SIG_IGN is lifted later.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarFrederic Weisbecker <frederic@kernel.org>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20241105064213.920101900@linutronix.de
parent 647da5f7

include/linux/sched/signal.h

+1 −0
Original line number Diff line number Diff line
@@ -138,6 +138,7 @@ struct signal_struct { 
	/* POSIX.1b Interval Timers */

	unsigned int		next_posix_timer_id;

	struct hlist_head	posix_timers;

	struct hlist_head	ignored_posix_timers;



	/* ITIMER_REAL timer for the process */

	struct hrtimer real_timer;

init/init_task.c

+3 −2
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ static struct signal_struct init_signals = { 
	.exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock),

#ifdef CONFIG_POSIX_TIMERS

	.posix_timers		= HLIST_HEAD_INIT,

	.ignored_posix_timers	= HLIST_HEAD_INIT,

	.cputimer		= {

		.cputime_atomic	= INIT_CPUTIME_ATOMIC,

	},

kernel/fork.c

+1 −0
Original line number Diff line number Diff line
@@ -1864,6 +1864,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk) 


#ifdef CONFIG_POSIX_TIMERS

	INIT_HLIST_HEAD(&sig->posix_timers);

	INIT_HLIST_HEAD(&sig->ignored_posix_timers);

	hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);

	sig->real_timer.function = it_real_fn;

#endif