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Commit f49ee505 authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Linus Torvalds
Browse files

introduce kill_orphaned_pgrp() helper 



Factor out the common code in reparent_thread() and exit_notify().

No functional changes.

Signed-off-by: default avatarOleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 5ce2087e

kernel/exit.c

+35 −39
Original line number Diff line number Diff line
@@ -255,6 +255,37 @@ static int has_stopped_jobs(struct pid *pgrp) 
	return retval;

}



/*

 * Check to see if any process groups have become orphaned as

 * a result of our exiting, and if they have any stopped jobs,

 * send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2)

 */

static void

kill_orphaned_pgrp(struct task_struct *tsk, struct task_struct *parent)

{

	struct pid *pgrp = task_pgrp(tsk);

	struct task_struct *ignored_task = tsk;



	if (!parent)

		 /* exit: our father is in a different pgrp than

		  * we are and we were the only connection outside.

		  */

		parent = tsk->real_parent;

	else

		/* reparent: our child is in a different pgrp than

		 * we are, and it was the only connection outside.

		 */

		ignored_task = NULL;



	if (task_pgrp(parent) != pgrp &&

	    task_session(parent) == task_session(tsk) &&

	    will_become_orphaned_pgrp(pgrp, ignored_task) &&

	    has_stopped_jobs(pgrp)) {

		__kill_pgrp_info(SIGHUP, SEND_SIG_PRIV, pgrp);

		__kill_pgrp_info(SIGCONT, SEND_SIG_PRIV, pgrp);

	}

}



/**

 * reparent_to_kthreadd - Reparent the calling kernel thread to kthreadd

 *
@@ -635,22 +666,7 @@ reparent_thread(struct task_struct *p, struct task_struct *father, int traced) 
	    p->exit_signal != -1 && thread_group_empty(p))

		do_notify_parent(p, p->exit_signal);



	/*

	 * process group orphan check

	 * Case ii: Our child is in a different pgrp

	 * than we are, and it was the only connection

	 * outside, so the child pgrp is now orphaned.

	 */

	if ((task_pgrp(p) != task_pgrp(father)) &&

	    (task_session(p) == task_session(father))) {

		struct pid *pgrp = task_pgrp(p);



		if (will_become_orphaned_pgrp(pgrp, NULL) &&

		    has_stopped_jobs(pgrp)) {

			__kill_pgrp_info(SIGHUP, SEND_SIG_PRIV, pgrp);

			__kill_pgrp_info(SIGCONT, SEND_SIG_PRIV, pgrp);

		}

	}

	kill_orphaned_pgrp(p, father);

}



/*
@@ -738,8 +754,6 @@ static void forget_original_parent(struct task_struct *father) 
static void exit_notify(struct task_struct *tsk)

{

	int state;

	struct task_struct *t;

	struct pid *pgrp;



	/*

	 * This does two things:
@@ -753,25 +767,7 @@ static void exit_notify(struct task_struct *tsk) 
	exit_task_namespaces(tsk);



	write_lock_irq(&tasklist_lock);

	/*

	 * Check to see if any process groups have become orphaned

	 * as a result of our exiting, and if they have any stopped

	 * jobs, send them a SIGHUP and then a SIGCONT.  (POSIX 3.2.2.2)

	 *

	 * Case i: Our father is in a different pgrp than we are

	 * and we were the only connection outside, so our pgrp

	 * is about to become orphaned.

	 */

	t = tsk->real_parent;



	pgrp = task_pgrp(tsk);

	if ((task_pgrp(t) != pgrp) &&

	    (task_session(t) == task_session(tsk)) &&

	    will_become_orphaned_pgrp(pgrp, tsk) &&

	    has_stopped_jobs(pgrp)) {

		__kill_pgrp_info(SIGHUP, SEND_SIG_PRIV, pgrp);

		__kill_pgrp_info(SIGCONT, SEND_SIG_PRIV, pgrp);

	}

	kill_orphaned_pgrp(tsk, NULL);



	/* Let father know we died

	 *
@@ -788,7 +784,7 @@ static void exit_notify(struct task_struct *tsk) 
	 * the same after a fork.

	 */

	if (tsk->exit_signal != SIGCHLD && tsk->exit_signal != -1 &&

	    ( tsk->parent_exec_id != t->self_exec_id  ||

	    (tsk->parent_exec_id != tsk->real_parent->self_exec_id ||

	     tsk->self_exec_id != tsk->parent_exec_id)

	    && !capable(CAP_KILL))

		tsk->exit_signal = SIGCHLD;