RPC简单使用

http://www.cnblogs.com/tzhangofseu/archive/2011/11/13/2247318.html

test.x

1 program TESTPROG {
2     version TESTVERS {
3         int Test(string) = 1;
4     } = 1;
5 } = 0x30000000;

test_local.c

#include <stdio.h>
#include <stdlib.h>
#include "test.h"
#define HOST "localhost"
int test(char *);
CLIENT * handle;
int main(int argc, char **argv)
{
    handle = clnt_create(argv[1], TESTPROG, TESTVERS, "tcp");
    if (handle == NULL) {
        printf("connect errror\n");
        exit(1);
    }
    char a[100] = "gaga";
    printf("%d\n", test(a));
    return 0;
}
test_remote.c
 
#include <rpc/rpc.h>
#include <string.h>
#include "test.h"
int test(char * str)
{
    return strlen(str);    
}
 
执行rpggen test.x生成三个文件
test.h
/*
 * Please do not edit this file.
 * It was generated using rpcgen.
*/
#ifndef _TEST_H_RPCGEN
#define _TEST_H_RPCGEN
#include <rpc/rpc.h>

#ifdef __cplusplus
extern "C" {
#endif

#define TESTPROG 0x30000000
#define TESTVERS 1
#if defined(__STDC__) || defined(__cplusplus)
#define Test 1
extern  int * test_1(char **, CLIENT *);
extern  int * test_1_svc(char **, struct svc_req *);
extern int testprog_1_freeresult (SVCXPRT *, xdrproc_t, caddr_t);
#else /* K&R C */
#define Test 1
extern  int * test_1();
extern  int * test_1_svc();
extern int testprog_1_freeresult ();
#endif /* K&R C */
#ifdef __cplusplus
}
#endif
#endif /* !_TEST_H_RPCGEN */
 
test_clnt.c
/*
 * Please do not edit this file.
 * It was generated using rpcgen.
*/
#include <memory.h> /* for memset */
#include "test.h"
/* Default timeout can be changed using clnt_control() */
static struct timeval TIMEOUT = { 25, 0 };
int *
test_1(char **argp, CLIENT *clnt)
{
    static int clnt_res;
    memset((char *)&clnt_res, 0, sizeof(clnt_res));
    if (clnt_call (clnt, Test,
        (xdrproc_t) xdr_wrapstring, (caddr_t) argp,
        (xdrproc_t) xdr_int, (caddr_t) &clnt_res,
        TIMEOUT) != RPC_SUCCESS) {
        return (NULL);
    }
    return (&clnt_res);
}
extern CLIENT * handle;
static int * ret;
int test(char * str)
{
    char ** arg = &str;
    ret = test_1(arg, handle);
    return (ret==0)?0:*ret;
}
test_svc.c
 
/*
 * Please do not edit this file.
 * It was generated using rpcgen.
*/
#include "test.h"
#include <stdio.h>
#include <stdlib.h>
#include <rpc/pmap_clnt.h>
#include <string.h>
#include <memory.h>
#include <sys/socket.h>
#include <netinet/in.h>
#ifndef SIG_PF
#define SIG_PF void(*)(int)
#endif
static void
testprog_1(struct svc_req *rqstp, register SVCXPRT *transp)
{
    union {
        char *test_1_arg;
    } argument;
    char *result;
    xdrproc_t _xdr_argument, _xdr_result;
    char *(*local)(char *, struct svc_req *);
    switch (rqstp->rq_proc) {
    case NULLPROC:
        (void) svc_sendreply (transp, (xdrproc_t) xdr_void, (char *)NULL);
        return;
    case Test:
        _xdr_argument = (xdrproc_t) xdr_wrapstring;
        _xdr_result = (xdrproc_t) xdr_int;
        local = (char *(*)(char *, struct svc_req *)) test_1_svc;
        break;
    default:
        svcerr_noproc (transp);
        return;
    }
    memset ((char *)&argument, 0, sizeof (argument));
    if (!svc_getargs (transp, (xdrproc_t) _xdr_argument, (caddr_t) &argument)) {
        svcerr_decode (transp);
        return;
    }
    result = (*local)((char *)&argument, rqstp);
    if (result != NULL && !svc_sendreply(transp, (xdrproc_t) _xdr_result, result)) {
        svcerr_systemerr (transp);
    }
    if (!svc_freeargs (transp, (xdrproc_t) _xdr_argument, (caddr_t) &argument)) {
        fprintf (stderr, "%s", "unable to free arguments");
        exit (1);
    }
    return;
}
int
main (int argc, char **argv)
{
    register SVCXPRT *transp;
    pmap_unset (TESTPROG, TESTVERS);
    transp = svcudp_create(RPC_ANYSOCK);
    if (transp == NULL) {
        fprintf (stderr, "%s", "cannot create udp service.");
        exit(1);
    }
    if (!svc_register(transp, TESTPROG, TESTVERS, testprog_1, IPPROTO_UDP)) {
        fprintf (stderr, "%s", "unable to register (TESTPROG, TESTVERS, udp).");
        exit(1);
    }
    transp = svctcp_create(RPC_ANYSOCK, 0, 0);
    if (transp == NULL) {
        fprintf (stderr, "%s", "cannot create tcp service.");
        exit(1);
    }
    if (!svc_register(transp, TESTPROG, TESTVERS, testprog_1, IPPROTO_TCP)) {
        fprintf (stderr, "%s", "unable to register (TESTPROG, TESTVERS, tcp).");
        exit(1);
    }
    svc_run ();
    fprintf (stderr, "%s", "svc_run returned");
    exit (1);
    /* NOTREACHED */
}
int test(char *);
static int retcode;
int * test_1_svc(char ** arg, struct svc_req * rqstp)
{
    retcode = test(*arg);
    return &retcode;
}
生成的两个C文件中有部分是自己添加的。
Makefile
 
all: test_clnt test_svc
USER_MARCOS := DEBUG
CFLAGS := -g -static -Wall
CC := gcc 
SRCCLNT := test_clnt.c test_local.c
SRCSVC := test_svc.c test_remote.c
OBJCLNT := $(patsubst %.c,%.o,$(SRCCLNT))
OBJSVC := $(patsubst %.c,%.o,$(SRCSVC))
%.o:%.c
    $(CC) $(CFLAGS) $(addprefix -D,$(USER_MARCOS)) -c $< -o $@
    
test_clnt: ${OBJCLNT}
    $(CC) $(CFLAGS) -o test_clnt $(OBJCLNT)
test_svc: ${OBJSVC}
    $(CC) $(CFLAGS) -o test_svc $(OBJSVC)
clean:
    rm -rf test_clnt test_svc $(OBJCLNT) $(OBJSVC)
使用
root下运行
./test_svc
普通用户下运行
./test_clnt localhost即可
功能是计算字符串长度。