18.file_server.c

//
// Created by satellite on 5/5/2023.
//
#include "stdio.h"
#include "stdlib.h"
#include "string.h"
#include "unistd.h"
#include "arpa/inet.h"
#include "sys/socket.h"

#define BUF_SIZE 30

void error_handling(char* message)
{
    fputs(message,stderr);
    fputc('\n',stderr);
    exit(1);
}

int main(int argc , char *argv[])
{
    int serv_sd , clnt_sd;
    FILE *fp;
    char buf[BUF_SIZE];
    int read_cnt;

    struct sockaddr_in serv_adr , clnt_adr;
    socklen_t clnt_adr_sz;

    if(argc != 2)
    {
        printf("Using %s : <PORT>",argv[0]);
        exit(1);
    }

    fp = fopen("../18.file_server.c","rb");
    serv_sd = socket(PF_INET,SOCK_STREAM,0);

    memset(&serv_adr,0,sizeof (serv_adr));
    serv_adr.sin_family = AF_INET;
    serv_adr.sin_addr.s_addr = htonl(INADDR_ANY);
    serv_adr.sin_port = htons(atoi(argv[1]));

    bind(serv_sd,(struct sockaddr*)&serv_adr,sizeof(serv_adr));
    listen(serv_sd,5);

    clnt_adr_sz = sizeof(clnt_adr);
    clnt_sd = accept(serv_sd,(struct sockaddr*)&clnt_adr,&clnt_adr_sz);

    while(1)
    {
        read_cnt = fread((void*)buf,1,BUF_SIZE,fp);
        if(read_cnt < BUF_SIZE)
        {
            write(clnt_sd,buf,read_cnt);
            break;
        }
        write(clnt_sd,buf,BUF_SIZE);
    }
    shutdown(clnt_sd,SHUT_WR);
    //只关闭了输出流，向客户端发送了EOF，这样客户端就知道了文件传输结束了
    read(clnt_sd,buf,BUF_SIZE);
    printf("Message form client : %s \n",buf);

    fclose(fp);
    close(clnt_sd);
    close(serv_sd);
    return 0;

}