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 __cplusplusextern "C" {#endif
#define TESTPROG 0x30000000#define TESTVERS 1
#if defined(__STDC__) || defined(__cplusplus)#define Test 1extern  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 1extern  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 voidtestprog_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;}
intmain (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 := DEBUGCFLAGS := -g -static -WallCC := gcc 
SRCCLNT := test_clnt.c test_local.cSRCSVC := 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。