tcp.c

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· C语言 代码 · 共 106 行

# ifndef lint
static char *sccsid = "@(#)tcp.c	4.1	(ULTRIX)	7/2/90";
# endif not lint

/****************************************************************
 *								*
 *  Licensed to Digital Equipment Corporation, Maynard, MA	*
 *		Copyright 1985 Sun Microsystems, Inc.		*
 *			All rights reserved.			*
 *								*
 ****************************************************************/
/**/
/*
 *	Modification history:
 *	~~~~~~~~~~~~~~~~~~~~
 *
 *	revision			comments
 *	--------	-----------------------------------------------
 *
 *	01-Jun-89	Fred Glover
 *			Update for nfssrc 4.0
 *
 *	18-Jan-88	fries
 *			Added Header and Copyright notice.
 *
 *	
 */

/*
 * make tcp calls
 */

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

extern int debug;
/*
 *  routine taken from new_calltcp.c;
 *  no caching is done!
 *  continueously calling if timeout;
 *  in case of error, print put error msg; this msg usually is to be
 *  thrown away
 */
int
call_tcp(host, prognum, versnum, procnum, inproc, in, outproc, out, tot )
        char *host;
        xdrproc_t inproc, outproc;
        char *in, *out;
	int tot;
{
        struct sockaddr_in server_addr;
	struct in_addr *get_addr_cache();
        enum clnt_stat clnt_stat;
        struct hostent *hp;
        struct timeval  tottimeout;
        register CLIENT *client;
        int socket = RPC_ANYSOCK;
 
        if ((hp = gethostbyname(host)) == NULL) {
		if (debug)
			printf( "RPC_UNKNOWNHOST\n");
		return((int) RPC_UNKNOWNHOST);
	}
        bcopy(hp->h_addr, (caddr_t)&server_addr.sin_addr, hp->h_length);      
        server_addr.sin_family = AF_INET;
        server_addr.sin_port =  0;

        tottimeout.tv_usec = 0;
        tottimeout.tv_sec = tot; 
        if ((client = clnttcp_create(&server_addr, prognum,
            versnum,  &socket, 0, 0)) == NULL)
		{ 
                clnt_pcreateerror("clnttcp_create");   /* RPC_PMAPFAILURE or RPC_SYSTEMERROR */
		return ((int) rpc_createerr.cf_stat);  /* return (svr_not_avail); */
		}
again:
        clnt_stat = clnt_call(client, procnum, inproc, in,
            outproc, out, tottimeout);
	if (clnt_stat != RPC_SUCCESS)  {
		if( clnt_stat == RPC_TIMEDOUT) {
			if(tot != 0) {
				if(debug)
					printf("call_tcp timeout, retry\n");
				goto again;
			}
			/* if tot == 0, no reply is expected */
		}
		else {
			if(debug) {
				clnt_perrno(clnt_stat);
				fprintf(stderr, "\n");
			}
		}
	}
        /* should do cacheing, rather than always destroy */
        (void) close(socket);
        clnt_destroy(client);
        return (int) clnt_stat;
}