/*
 * ep - extended pipelining
 *
 * fd.h - filedescriptor structure header file
 * ____________________________________________________________
 *
 * Developed by Ondrej Jombik <nepto@platon.sk>
 *          and Lubomir Host <rajo@platon.sk>
 * Copyright (c) 2000-2003 Platon SDG, http://platon.sk/
 * All rights reserved.
 *
 * See README file for more information about this software.
 * See COPYING file for license information.
 *
 * Download the latest version from
 * http://platon.sk/projects/ep/
 */

/* $Platon: ep/src/fd.h,v 1.11 2003/05/03 09:58:19 nepto Exp $ */

#ifndef _FD_H
#define _FD_H

#include "proclink.h"

#define N_FD	        3

#define FD_IN           0
#define FD_OUT          1
#define FD_ERR          2
#define INVALID_FD		0xffff

#define N_FD_STR	(4)


struct fd
{
	/* ID */
	/* int id; */

	/* Number of links. */
	int n_link;

	/* Dynamic array of links with size n_link. */
	struct proclink *link;

	/* Link's pipe. */
	int pipe[2];

};

/* Returns the fd str of fd id. */
char *fd_id_to_fd_str(int id);

/* Returns the fd id of string fd str. */
int fd_str_to_fd_id(char *str);

/* Add link to fd..							*/
/* Return 1 if OK, 0 for errors.			*/
int fd_add_proclink(
		struct fd *fd,
		const struct proclink *link);

/* Remove link from fd.							*/
/* Return 1 if OK, 0 for errors.				*/
int fd_remove_proclink(
		struct fd *fd,
		const struct proclink *link);

int fd_remove_proclink2(
		struct fd *fd,
		int link_proc_id,
		int link_fd_id);

int fd_remove_proclink_by_index(
		struct fd *fd,
		const int index);

/* Check existence of link in process according to fd_no. */
/* Return index + 1 of link if link exists, 0 if not.	*/
int fd_is_proclink(
		struct fd *fd,
		const struct proclink *link);

int fd_is_proclink2(
		struct fd *fd,
		int link_proc_id,
		int link_fd_id);

#endif /* #ifndef _FD_H */