/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright 2015 Joyent, Inc.
 */

#include <sys/feature_tests.h>

#include "lint.h"
#include <sys/types.h>
#include <sys/file.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>

int
flock(int fildes, int operation)
{
        struct flock64 l;
        int op;
        int rv;

        l.l_whence = SEEK_SET;
        l.l_start = 0;
        l.l_len = 0;
        l.l_sysid = 0;
        l.l_pid = 0;

        switch (operation & ~LOCK_NB) {
        case LOCK_UN:
                if (operation & LOCK_NB) {
                        errno = EINVAL;
                        return (-1);
                }
                l.l_type = F_UNLCK;
                rv = fcntl(fildes, F_FLOCK, &l);
                break;
        case LOCK_EX:
        case LOCK_SH:
                l.l_type = ((operation & ~LOCK_NB) == LOCK_EX) ?
                    F_WRLCK : F_RDLCK;
                op = (operation & LOCK_NB) ? F_FLOCK : F_FLOCKW;
                rv = fcntl(fildes, op, &l);
                break;
        default:
                errno = EINVAL;
                return (-1);
        }

        return (rv);
}