libnsl/rpc/rpc_td.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 1992, 2011, Oracle and/or its affiliates. All rights reserved.
 */

#include "mt.h"
#include "rpc_mt.h"
#include <stdio.h>
#include <rpc/rpc.h>
#include <errno.h>
#include <tiuser.h>
#include <string.h>
#include <stropts.h>
#include <netinet/tcp.h>
#include <stdlib.h>

#define MAXOPTSIZE 64

int
__td_setnodelay(int fd)
{
    int rval = 0;
    static mutex_t td_opt_lock = DEFAULTMUTEX;
    static struct t_optmgmt t_optreq, t_optret;
    int state;


    /* VARIABLES PROTECTED BY td_opt_lock: t_optreq, t_optret */

    if ((state = t_getstate(fd)) == -1)
        return (-1);

    (void) mutex_lock(&td_opt_lock);
    if ((state == T_IDLE) && (t_optreq.flags != T_NEGOTIATE)) {
        int i = 1;
        struct opthdr *opt;

        t_optreq.flags = T_NEGOTIATE;
        t_optreq.opt.maxlen = MAXOPTSIZE;
        t_optreq.opt.buf = malloc(MAXOPTSIZE);
        if (t_optreq.opt.buf == NULL) {
            (void) mutex_unlock(&td_opt_lock);
            t_errno = TSYSERR;
            return (-1);
        }
        opt = (struct opthdr *)(t_optreq.opt.buf);
        opt->name = TCP_NODELAY;
        opt->len = 4;
        opt->level = IPPROTO_TCP;
        (void) memcpy((caddr_t)t_optreq.opt.buf +
            sizeof (struct opthdr), &i, sizeof (int));
        t_optreq.opt.len = (int)(sizeof (struct opthdr) +
            sizeof (int));

        t_optret.opt.maxlen = MAXOPTSIZE;
        t_optret.opt.len = 0;
        t_optret.opt.buf = malloc(MAXOPTSIZE);
        if (t_optret.opt.buf == NULL) {
            (void) mutex_unlock(&td_opt_lock);
            free(t_optreq.opt.buf);
            t_errno = TSYSERR;
            return (-1);
        }
    }

    if (state == T_IDLE)
        rval = t_optmgmt(fd, &t_optreq, &t_optret);

    (void) mutex_unlock(&td_opt_lock);
    return (rval);
}