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/*
 * Ouroboros - Copyright (C) 2016
 *
 * Flows
 *
 *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef IPCPD_FLOW_H
#define IPCPD_FLOW_H

#include <ouroboros/common.h>

#ifdef FLOW_MT_SAFE
#include <pthread.h>
#endif

/* same values as fcntl.h */
#define FLOW_O_RDONLY   00000000
#define FLOW_O_WRONLY   00000001
#define FLOW_O_RDWR     00000002
#define FLOW_O_ACCMODE  00000003

#define FLOW_O_NONBLOCK 00004000
#define FLOW_O_DEFAULT  00000002

#define FLOW_O_INVALID  00037777

typedef long port_id_t;

enum flow_state {
        FLOW_INIT = 0,
        FLOW_ALLOCATED,
        FLOW_PENDING
};

typedef struct flow {
        port_id_t       port_id;
        uint16_t        flags;
        uint8_t         state;
#ifdef FLOW_MT_SAFE
        pthread_mutex_t lock;
#endif
} flow_t;

flow_t * flow_create(port_id_t port_id);
void     flow_destroy(flow_t * flow);

int      flow_set_opts(flow_t * flow, uint16_t opts);
uint16_t flow_get_opts(const flow_t * flow);

#endif /* IPCPD_FLOW_H */