sortix--sortix/libc/stdio/funregister.c

/*
 * Copyright (c) 2011, 2012, 2013, 2014 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * stdio/funregister.c
 * Unregisters a FILE in the global list of open FILEs.
 */

#include <pthread.h>
#include <stdio.h>

void funregister(FILE* fp)
{
	if ( !(fp->flags & _FILE_REGISTERED) )
		return;
	pthread_mutex_lock(&__first_file_lock);
	if ( !fp->prev )
		__first_file = fp->next;
	if ( fp->prev )
		fp->prev->next = fp->next;
	if ( fp->next )
		fp->next->prev = fp->prev;
	fp->flags &= ~_FILE_REGISTERED;
	pthread_mutex_unlock(&__first_file_lock);
}