Socket远程执行命令并结果回传（服务端）

/*
*服务器端，发送命令，等待结果回传
* By rekken
*/
#include <sys/types.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <string.h>
#include <netdb.h>
#define SERVERPORT 3490
int main(int argc,char *argv[])
{
        //scokfd:a socket descriptor,  sendbytes and recvbytes used for send() and recv(),
    int sockfd,sendbytes,recvbytes;
    char recvdata[65535];        //store the data received
    char i_return[65535];
    char *p_return;
    char *i_Command=argv[2];    //argv[2] store the file dir received from the keyboard
    struct hostent *host;    //for dns transmition
    struct sockaddr_in serv_addr;    //store the ip and other server info
    if(argc<3){
        fprintf(stderr,"Please enter AS: servername fileDirectory\n");
        exit(1);
    }
        //address resolution function
    if((host=gethostbyname(argv[1]))==NULL){
        perror("gethostbyname");
        exit(1);
    }
        //file directory not NULL
    if(i_Command==NULL){
        perror("file");
        exit(1);
    }
        //create socket
    if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1){
        perror("socket");
        exit(1);
    }
        //set relevant parameters in the socketr_in struct
    serv_addr.sin_family=AF_INET;
    serv_addr.sin_port=htons(SERVERPORT);
    serv_addr.sin_addr=*((struct in_addr *)host->h_addr);
    bzero(&(serv_addr.sin_zero),8);
        //call the connect() function to connect to server intiative
    if(connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(struct sockaddr))==-1){
        perror("connect");
        exit(1);
    }
        //send message to sever
    if((sendbytes=send(sockfd,i_Command,120,0))==-1){
        perror("send");
        exit(1);
    }
    printf("Send:%s\n",argv[2]);
        //receive data
        p_return=i_return;
     while(1){
        if((recvbytes=recv(sockfd,recvdata,65535,0))==-1){
            perror("receive file:");
            exit(1);
        }
        memcpy(p_return,recvdata,recvbytes);
        p_return=p_return+recvbytes;
        if(!recvbytes)
            break;
    };
            printf("Receive data :%s",i_return);
    close(sockfd);
    return 1;
}