Esempio n. 1
0
volatile void do_exit(long code)
{
	struct task_struct *p;
	int i;

fake_volatile:
	free_page_tables(current);
	for (i=0 ; i<NR_OPEN ; i++)
		if (current->filp[i])
			sys_close(i);
	forget_original_parent(current);
	iput(current->pwd);
	current->pwd = NULL;
	iput(current->root);
	current->root = NULL;
	iput(current->executable);
	current->executable = NULL;
	for (i=0; i < current->numlibraries; i++) {
		iput(current->libraries[i].library);
		current->libraries[i].library = NULL;
	}	
	current->state = TASK_ZOMBIE;
	current->exit_code = code;
	current->rss = 0;
	/* 
	 * 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 SIGUP 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.
 	 */
	if ((current->p_pptr->pgrp != current->pgrp) &&
	    (current->p_pptr->session == current->session) &&
	    is_orphaned_pgrp(current->pgrp) &&
	    has_stopped_jobs(current->pgrp)) {
		kill_pg(current->pgrp,SIGHUP,1);
		kill_pg(current->pgrp,SIGCONT,1);
	}
	/* Let father know we died */
	send_sig (SIGCHLD, current->p_pptr, 1);
	
	/*
	 * This loop does two things:
	 * 
  	 * A.  Make init inherit all the child processes
	 * B.  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)
	 */
	while ((p = current->p_cptr) != NULL) {
		current->p_cptr = p->p_osptr;
		p->p_ysptr = NULL;
		p->flags &= ~(PF_PTRACED|PF_TRACESYS);
		if (task[1])
			p->p_pptr = task[1];
		else
			p->p_pptr = task[0];
		p->p_osptr = p->p_pptr->p_cptr;
		p->p_osptr->p_ysptr = p;
		p->p_pptr->p_cptr = p;
		if (p->state == TASK_ZOMBIE)
			send_sig(SIGCHLD,p->p_pptr,1);
		/*
		 * 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 ((p->pgrp != current->pgrp) &&
		    (p->session == current->session) &&
		    is_orphaned_pgrp(p->pgrp) &&
		    has_stopped_jobs(p->pgrp)) {
			kill_pg(p->pgrp,SIGHUP,1);
			kill_pg(p->pgrp,SIGCONT,1);
		}
	}
	if (current->leader) {
		struct task_struct **p;
		struct tty_struct *tty;

		if (current->tty >= 0) {
			tty = TTY_TABLE(current->tty);
			if (tty) {
				if (tty->pgrp > 0)
					kill_pg(tty->pgrp, SIGHUP, 1);
				tty->pgrp = -1;
				tty->session = 0;
			}
		}
	 	for (p = &LAST_TASK ; p > &FIRST_TASK ; --p)
			if (*p && (*p)->session == current->session)
				(*p)->tty = -1;
	}
	if (last_task_used_math == current)
		last_task_used_math = NULL;
#ifdef DEBUG_PROC_TREE
	audit_ptree();
#endif
	schedule();
/*
 * In order to get rid of the "volatile function does return" message
 * I did this little loop that confuses gcc to think do_exit really
 * is volatile. In fact it's schedule() that is volatile in some
 * circumstances: when current->state = ZOMBIE, schedule() never
 * returns.
 *
 * In fact the natural way to do all this is to have the label and the
 * goto right after each other, but I put the fake_volatile label at
 * the start of the function just in case something /really/ bad
 * happens, and the schedule returns. This way we can try again. I'm
 * not paranoid: it's just that everybody is out to get me.
 */
	goto fake_volatile;
}
Esempio n. 2
0
NORET_TYPE void do_exit(long code)
{
	struct task_struct *p;
	int i;

fake_volatile:
	if (current->semun)
		sem_exit();
	if (current->shm)
		shm_exit();
	free_page_tables(current);
	for (i=0 ; i<NR_OPEN ; i++)
		if (current->filp[i])
			sys_close(i);
	forget_original_parent(current);
	iput(current->pwd);
	current->pwd = NULL;
	iput(current->root);
	current->root = NULL;
	iput(current->executable);
	current->executable = NULL;
	/* Release all of the old mmap stuff. */
	
	{
		struct vm_area_struct * mpnt, *mpnt1;
		mpnt = current->mmap;
		current->mmap = NULL;
		while (mpnt) {
			mpnt1 = mpnt->vm_next;
			if (mpnt->vm_ops && mpnt->vm_ops->close)
				mpnt->vm_ops->close(mpnt);
			kfree(mpnt);
			mpnt = mpnt1;
		}
	}

	if (current->ldt) {
		vfree(current->ldt);
		current->ldt = NULL;
		for (i=1 ; i<NR_TASKS ; i++) {
			if (task[i] == current) {
				set_ldt_desc(gdt+(i<<1)+FIRST_LDT_ENTRY, &default_ldt, 1);
				load_ldt(i);
			}
		}
	}

	current->state = TASK_ZOMBIE;
	current->exit_code = code;
	current->rss = 0;
	/* 
	 * 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 SIGUP 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.
 	 */
	if ((current->p_pptr->pgrp != current->pgrp) &&
	    (current->p_pptr->session == current->session) &&
	    is_orphaned_pgrp(current->pgrp) &&
	    has_stopped_jobs(current->pgrp)) {
		kill_pg(current->pgrp,SIGHUP,1);
		kill_pg(current->pgrp,SIGCONT,1);
	}
	/* Let father know we died */

    /* 通知父进程 */
	notify_parent(current);
	
	/*
	 * This loop does two things:
	 * 
  	 * A.  Make init inherit all the child processes
	 * B.  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)
	 */
	while ((p = current->p_cptr) != NULL) {
		current->p_cptr = p->p_osptr;
		p->p_ysptr = NULL;
		p->flags &= ~(PF_PTRACED|PF_TRACESYS);
		if (task[1] && task[1] != current)
			p->p_pptr = task[1];
		else
			p->p_pptr = task[0];
		p->p_osptr = p->p_pptr->p_cptr;
		p->p_osptr->p_ysptr = p;
		p->p_pptr->p_cptr = p;
		if (p->state == TASK_ZOMBIE)
			notify_parent(p);
		/*
		 * 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 ((p->pgrp != current->pgrp) &&
		    (p->session == current->session) &&
		    is_orphaned_pgrp(p->pgrp) &&
		    has_stopped_jobs(p->pgrp)) {
			kill_pg(p->pgrp,SIGHUP,1);
			kill_pg(p->pgrp,SIGCONT,1);
		}
	}
	if (current->leader)
		disassociate_ctty(1);
	if (last_task_used_math == current)
		last_task_used_math = NULL;
#ifdef DEBUG_PROC_TREE
	audit_ptree();
#endif
	schedule();
/*
 * In order to get rid of the "volatile function does return" message
 * I did this little loop that confuses gcc to think do_exit really
 * is volatile. In fact it's schedule() that is volatile in some
 * circumstances: when current->state = ZOMBIE, schedule() never
 * returns.
 *
 * In fact the natural way to do all this is to have the label and the
 * goto right after each other, but I put the fake_volatile label at
 * the start of the function just in case something /really/ bad
 * happens, and the schedule returns. This way we can try again. I'm
 * not paranoid: it's just that everybody is out to get me.
 */
	goto fake_volatile;
}
Esempio n. 3
0
/*
 * Send signals to all our closest relatives so that they know
 * to properly mourn us..
 */
static void exit_notify(void)
{
	struct task_struct * p, *t;

	forget_original_parent(current);
	/*
	 * 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 = current->p_pptr;
	
	if ((t->pgrp != current->pgrp) &&
	    (t->session == current->session) &&
	    will_become_orphaned_pgrp(current->pgrp, current) &&
	    has_stopped_jobs(current->pgrp)) {
		kill_pg(current->pgrp,SIGHUP,1);
		kill_pg(current->pgrp,SIGCONT,1);
	}

	/* Let father know we died 
	 *
	 * Thread signals are configurable, but you aren't going to use
	 * that to send signals to arbitary processes. 
	 * That stops right now.
	 *
	 * If the parent exec id doesn't match the exec id we saved
	 * when we started then we know the parent has changed security
	 * domain.
	 *
	 * If our self_exec id doesn't match our parent_exec_id then
	 * we have changed execution domain as these two values started
	 * the same after a fork.
	 *	
	 */
	
	if (current->exit_signal && current->exit_signal != SIGCHLD &&
	    ( current->parent_exec_id != t->self_exec_id  ||
	      current->self_exec_id != current->parent_exec_id))
		current->exit_signal = SIGCHLD;


	/*
	 * This loop does two things:
	 *
  	 * A.  Make init inherit all the child processes
	 * B.  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)
	 */

	write_lock_irq(&tasklist_lock);
	current->state = TASK_ZOMBIE;
	do_notify_parent(current, current->exit_signal);
	while (current->p_cptr != NULL) {
		p = current->p_cptr;
		current->p_cptr = p->p_osptr;
		p->p_ysptr = NULL;
		p->ptrace = 0;

		p->p_pptr = p->p_opptr;
		p->p_osptr = p->p_pptr->p_cptr;
		if (p->p_osptr)
			p->p_osptr->p_ysptr = p;
		p->p_pptr->p_cptr = p;
		if (p->state == TASK_ZOMBIE)
			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 ((p->pgrp != current->pgrp) &&
		    (p->session == current->session)) {
			int pgrp = p->pgrp;

			write_unlock_irq(&tasklist_lock);
			if (is_orphaned_pgrp(pgrp) && has_stopped_jobs(pgrp)) {
				kill_pg(pgrp,SIGHUP,1);
				kill_pg(pgrp,SIGCONT,1);
			}
			write_lock_irq(&tasklist_lock);
		}
	}
	write_unlock_irq(&tasklist_lock);
}
Esempio n. 4
0
/* 
 * Send signals to all our closest relatives so that they know
 * to properly mourn us..
 */
static void exit_notify(void)
{
	struct task_struct * p;

	forget_original_parent(current);
	/* 
	 * 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.
	 */
	if ((current->p_pptr->pgrp != current->pgrp) &&
	    (current->p_pptr->session == current->session) &&
	    will_become_orphaned_pgrp(current->pgrp, current) &&
	    has_stopped_jobs(current->pgrp)) {
		kill_pg(current->pgrp,SIGHUP,1);
		kill_pg(current->pgrp,SIGCONT,1);
	}
	/* Let father know we died */
	notify_parent(current);
	
	/*
	 * This loop does two things:
	 * 
  	 * A.  Make init inherit all the child processes
	 * B.  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)
	 */
	while ((p = current->p_cptr) != NULL) {
		current->p_cptr = p->p_osptr;
		p->p_ysptr = NULL;
		p->flags &= ~(PF_PTRACED|PF_TRACESYS);
		if (task[smp_num_cpus] && task[smp_num_cpus] != current) /* init */
			p->p_pptr = task[smp_num_cpus];
		else
			p->p_pptr = task[0];
		p->p_osptr = p->p_pptr->p_cptr;
		p->p_osptr->p_ysptr = p;
		p->p_pptr->p_cptr = p;
		if (p->state == TASK_ZOMBIE)
			notify_parent(p);
		/*
		 * 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 ((p->pgrp != current->pgrp) &&
		    (p->session == current->session) &&
		    is_orphaned_pgrp(p->pgrp) &&
		    has_stopped_jobs(p->pgrp)) {
			kill_pg(p->pgrp,SIGHUP,1);
			kill_pg(p->pgrp,SIGCONT,1);
		}
	}
	if (current->leader)
		disassociate_ctty(1);
}