C语言RPC远程调用

系统:LinuxMint mate 17.2 32bit

gcc：gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04)

rpcgen:rpcgen (Ubuntu EGLIBC 2.19-0ubuntu6.6) 2.19

 

rpc依赖库 portmap或者 rpcbind

可执行 apt-get install portmap 进行安装，准备完毕后，详见以下步骤

创建规格文件 math.x,内容如下

/* filename: math.x */
const ADD = 0;
const SUB = 1;
const MUL = 2;
const DIV = 3;
struct MATH
{
int op; /* 0-ADD, 1-SUB, 2-MUL, 3-DIV */
float arg1;
float arg2;
float result;
};
program MATH_PROG
{
version MATH_VER
{
struct MATH MATH_PROC(struct MATH) = 1;
} = 2;
} = 0x20000001;

 终端中运行

 rpcgen –C –a math.x

生成7个文件，math.h、math_xdr.c、math_svc.c、math_clnt.c、Makefile.math、math_client.c、math_server.c

分别修改 math_server.c 和math_client.c如下

 

math_client.c

/*
 * This is sample code generated by rpcgen.
 * These are only templates and you can use them
 * as a guideline for developing your own functions.
 */
#include "math.h"
void math_prog_2(char *host) {
	CLIENT *clnt;
	struct MATH *result_1;
	struct MATH math_proc_2_arg;
	/* 2006/07/04 Dongyy Add -> */
	char c;
	printf(
			"choose the operation:\n\t0---ADD\n\t1---SUB\n\t2---MUL\n\t3---DIV\n");
	c = getchar();
	switch (c) {
	case '0':
		math_proc_2_arg.op = ADD;
		break;
	case '1':
		math_proc_2_arg.op = SUB;
		break;
	case '2':
		math_proc_2_arg.op = MUL;
		break;
	case '3':
		math_proc_2_arg.op = DIV;
		break;
	default:
		printf("error:operate\n");
		exit(1);
	}
	printf("input the first number:");
	scanf("%f", &math_proc_2_arg.arg1);
	printf("input the second number:");
	scanf("%f", &math_proc_2_arg.arg2);
	/* <- 2006/07/04 Dongyy Add */
#ifndef DEBUG
	clnt = clnt_create(host, MATH_PROG, MATH_VER, "udp");
	if (clnt == NULL) {
		clnt_pcreateerror(host);
		exit(1);
	}
#endif /* DEBUG */
	result_1 = math_proc_2(&math_proc_2_arg, clnt);
	if (result_1 == (struct MATH *) NULL) {
		clnt_perror(clnt, "call failed");
	}
#ifndef DEBUG
	clnt_destroy(clnt);
#endif /* DEBUG */
	/* 2006/07/04 Dongyy Add -> */
	printf("The Result is %.3f \n", result_1->result);
	/* <- 2006/07/04 Dongyy Add */
}
int main(int argc, char *argv[]) {
	char *host;
	if (argc < 2) {
		printf("usage: %s server_host\n", argv[0]);
		exit(1);
	}
	host = argv[1];
	math_prog_2(host);
	exit(0);
}

 

math_server.c

/*
 * This is sample code generated by rpcgen.
 * These are only templates and you can use them
 * as a guideline for developing your own functions.
 */
#include "math.h"
struct MATH *
math_proc_2_svc(struct MATH *argp, struct svc_req *rqstp) {
	static struct MATH result;
	/*
	 * insert server code here
	 */
	/* 2006/07/04 Dongyy Add -> */
	switch (argp->op) {
	case ADD:
		result.result = argp->arg1 + argp->arg2;
		break;
	case SUB:
		result.result = argp->arg1 - argp->arg2;
		break;
	case MUL:
		result.result = argp->arg1 * argp->arg2;
		break;
	case DIV:
		result.result = argp->arg1 / argp->arg2;
		break;
	default:
		break;
	}
	/* <- 2006/07/04 Dongyy Add */
	return &result;
}

 

编译，测试

gcc -Wall -o math_server math_server.c math_svc.c math_xdr.c

gcc -Wall -o math_client math_client.c math_xdr.c math_clnt.c

 

执行./math_server

另起终端执行: ./math_client 127.0.0.1

如下图

 

各位看官，自行脑补代码实现去。。。。