clnt_simple.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static char *sccsid = "@(#)clnt_simple.c	4.1	ULTRIX	7/3/90";
#endif lint

/************************************************************************
 *									*
 *			Copyright (c) 1986 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/*
 *	Portions of this software have been licensed to 
 *	Digital Equipment Company, Maynard, MA.
 *	Copyright (c) 1986 Sun Microsystems, Inc.  ALL RIGHTS RESERVED.
 */

/* 
 * clnt_simple.c
 * Simplified front end to rpc.
 *
 */

#include <stdio.h>
#include <rpc/rpc.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netdb.h>

char *malloc();
static CLIENT *client;
static int socket;
static int oldprognum, oldversnum, valid;
static char *oldhost;

callrpc(host, prognum, versnum, procnum, inproc, in, outproc, out)
	char *host;
	xdrproc_t inproc, outproc;
	char *in, *out;
{
	struct sockaddr_in server_addr;
	enum clnt_stat clnt_stat;
	struct hostent *hp;
	struct timeval timeout, tottimeout;

	if (oldhost == NULL) {
		oldhost = malloc(256);
		oldhost[0] = 0;
		socket = RPC_ANYSOCK;
	}
	if (valid && oldprognum == prognum && oldversnum == versnum
		&& strcmp(oldhost, host) == 0) {
		/* reuse old client */		
	}
	else {
		valid = 0;
		close(socket);
		socket = RPC_ANYSOCK;
		if (client) {
			clnt_destroy(client);
			client = NULL;
		}
		if ((hp = gethostbyname(host)) == NULL)
			return ((int) RPC_UNKNOWNHOST);
		timeout.tv_usec = 0;
		timeout.tv_sec = 5;
		bcopy(hp->h_addr, &server_addr.sin_addr, hp->h_length);
		server_addr.sin_family = AF_INET;
		server_addr.sin_port =  0;
		if ((client = clntudp_create(&server_addr, prognum,
		    versnum, timeout, &socket)) == NULL)
			return ((int) rpc_createerr.cf_stat);
		valid = 1;
		oldprognum = prognum;
		oldversnum = versnum;
		strcpy(oldhost, host);
	}
	tottimeout.tv_sec = 25;
	tottimeout.tv_usec = 0;
	clnt_stat = clnt_call(client, procnum, inproc, in,
	    outproc, out, tottimeout);
	/* 
	 * if call failed, empty cache
	 */
	if (clnt_stat != RPC_SUCCESS)
		valid = 0;
	return ((int) clnt_stat);
}