diff options
Diffstat (limited to 'kernel/exit.c')
| -rw-r--r-- | kernel/exit.c | 98 |
1 files changed, 47 insertions, 51 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 506a957b665a..53872bf993fa 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -214,20 +214,19 @@ struct pid *session_of_pgrp(struct pid *pgrp) static int will_become_orphaned_pgrp(struct pid *pgrp, struct task_struct *ignored_task) { struct task_struct *p; - int ret = 1; do_each_pid_task(pgrp, PIDTYPE_PGID, p) { - if (p == ignored_task - || p->exit_state - || is_global_init(p->real_parent)) + if ((p == ignored_task) || + (p->exit_state && thread_group_empty(p)) || + is_global_init(p->real_parent)) continue; + if (task_pgrp(p->real_parent) != pgrp && - task_session(p->real_parent) == task_session(p)) { - ret = 0; - break; - } + task_session(p->real_parent) == task_session(p)) + return 0; } while_each_pid_task(pgrp, PIDTYPE_PGID, p); - return ret; /* (sighing) "Often!" */ + + return 1; } int is_current_pgrp_orphaned(void) @@ -255,6 +254,37 @@ 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 +665,7 @@ 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); } /* @@ -735,11 +750,9 @@ static void forget_original_parent(struct task_struct *father) * Send signals to all our closest relatives so that they know * to properly mourn us.. */ -static void exit_notify(struct task_struct *tsk) +static void exit_notify(struct task_struct *tsk, int group_dead) { int state; - struct task_struct *t; - struct pid *pgrp; /* * This does two things: @@ -753,25 +766,8 @@ 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); - } + if (group_dead) + kill_orphaned_pgrp(tsk->group_leader, NULL); /* Let father know we died * @@ -788,8 +784,8 @@ 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->self_exec_id != tsk->parent_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; @@ -986,7 +982,7 @@ NORET_TYPE void do_exit(long code) module_put(tsk->binfmt->module); proc_exit_connector(tsk); - exit_notify(tsk); + exit_notify(tsk, group_dead); #ifdef CONFIG_NUMA mpol_free(tsk->mempolicy); tsk->mempolicy = NULL; @@ -1382,7 +1378,7 @@ unlock_sig: if (!retval && infop) retval = put_user(0, &infop->si_errno); if (!retval && infop) - retval = put_user(why, &infop->si_code); + retval = put_user((short)why, &infop->si_code); if (!retval && infop) retval = put_user(exit_code, &infop->si_status); if (!retval && infop) |