C++ (Cpp) autofs_notify_daemon Examples

Example #1

File: waitq.c Project: 3sOx/asuswrt-merlin

int autofs_wait(struct autofs_sb_info *sbi, struct qstr *name)
{
	struct autofs_wait_queue *wq;
	int status;

	/* In catatonic mode, we don't wait for nobody */
	if ( sbi->catatonic )
		return -ENOENT;
	
	/* We shouldn't be able to get here, but just in case */
	if ( name->len > NAME_MAX )
		return -ENOENT;

	for ( wq = sbi->queues ; wq ; wq = wq->next ) {
		if ( wq->hash == name->hash &&
		     wq->len == name->len &&
		     wq->name && !memcmp(wq->name,name->name,name->len) )
			break;
	}
	
	if ( !wq ) {
		/* Create a new wait queue */
		wq = kmalloc(sizeof(struct autofs_wait_queue),GFP_KERNEL);
		if ( !wq )
			return -ENOMEM;

		wq->name = kmalloc(name->len,GFP_KERNEL);
		if ( !wq->name ) {
			kfree(wq);
			return -ENOMEM;
		}
		wq->wait_queue_token = autofs_next_wait_queue++;
		init_waitqueue_head(&wq->queue);
		wq->hash = name->hash;
		wq->len = name->len;
		wq->status = -EINTR; /* Status return if interrupted */
		memcpy(wq->name, name->name, name->len);
		wq->next = sbi->queues;
		sbi->queues = wq;

		/* autofs_notify_daemon() may block */
		wq->wait_ctr = 2;
		autofs_notify_daemon(sbi,wq);
	} else
		wq->wait_ctr++;

	/* wq->name is NULL if and only if the lock is already released */

	if ( sbi->catatonic ) {
		/* We might have slept, so check again for catatonic mode */
		wq->status = -ENOENT;
		kfree(wq->name);
		wq->name = NULL;
	}

	if ( wq->name ) {
		/* Block all but "shutdown" signals while waiting */
		sigset_t sigmask;

		siginitsetinv(&sigmask, SHUTDOWN_SIGS);
		sigprocmask(SIG_BLOCK, &sigmask, &sigmask);

		interruptible_sleep_on(&wq->queue);

		sigprocmask(SIG_SETMASK, &sigmask, NULL);
	} else {
		DPRINTK(("autofs_wait: skipped sleeping\n"));
	}

	status = wq->status;

	if ( ! --wq->wait_ctr )	/* Are we the last process to need status? */
		kfree(wq);

	return status;
}

Example #2

int autofs_wait(struct autofs_sb_info *sbi, struct qstr * name)
{
	struct autofs_wait_queue *wq;
	int status;

	/* In catatonic mode, we don't wait for nobody */
	if ( sbi->catatonic )
		return -ENOENT;

	for ( wq = sbi->queues ; wq ; wq = wq->next ) {
		if ( wq->hash == name->hash &&
		     wq->len == name->len &&
		     wq->name && !memcmp(wq->name,name->name,name->len) )
			break;
	}
	
	if ( !wq ) {
		/* Create a new wait queue */
		wq = kmalloc(sizeof(struct autofs_wait_queue),GFP_KERNEL);
		if ( !wq )
			return -ENOMEM;

		wq->name = kmalloc(name->len,GFP_KERNEL);
		if ( !wq->name ) {
			kfree(wq);
			return -ENOMEM;
		}
		wq->wait_queue_token = autofs_next_wait_queue++;
		init_waitqueue(&wq->queue);
		wq->hash = name->hash;
		wq->len = name->len;
		wq->status = -EINTR; /* Status return if interrupted */
		memcpy(wq->name, name->name, name->len);
		wq->next = sbi->queues;
		sbi->queues = wq;

		/* autofs_notify_daemon() may block */
		wq->wait_ctr = 2;
		autofs_notify_daemon(sbi,wq);
	} else
		wq->wait_ctr++;

	/* wq->name is NULL if and only if the lock is already released */

	if ( sbi->catatonic ) {
		/* We might have slept, so check again for catatonic mode */
		wq->status = -ENOENT;
		if ( wq->name ) {
			kfree(wq->name);
			wq->name = NULL;
		}
	}

	if ( wq->name ) {
		/* Block all but "shutdown" signals while waiting */
		sigset_t oldset;
		unsigned long irqflags;

		spin_lock_irqsave(&current->sigmask_lock, irqflags);
		oldset = current->blocked;
		siginitsetinv(&current->blocked, SHUTDOWN_SIGS & ~oldset.sig[0]);
		recalc_sigpending(current);
		spin_unlock_irqrestore(&current->sigmask_lock, irqflags);

		interruptible_sleep_on(&wq->queue);

		spin_lock_irqsave(&current->sigmask_lock, irqflags);
		current->blocked = oldset;
		recalc_sigpending(current);
		spin_unlock_irqrestore(&current->sigmask_lock, irqflags);
	} else {
		DPRINTK(("autofs_wait: skipped sleeping\n"));
	}

	status = wq->status;

	if ( ! --wq->wait_ctr )	/* Are we the last process to need status? */
		kfree(wq);

	return status;
}