网络编程学习笔记 五-迭代服务器端、客户端实现(二 Linux)

服务器端

#include 
#include 
#include 
#include 
#include 
#include 

const int BUF_SIZE = 1024;

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

int main(int argc, char *argv[])
{
    int serv_sock, clnt_sock;
    char message[BUF_SIZE];
    int str_len,i;

    struct sockaddr_in serv_adr, clnt_adr;
    socklen_t clnt_adr_sz;

    if(argc!=2)
    {
        printf("Usage: %s \n",argv[0]);
        exit(1);
    }

    serv_sock = socket(PF_INET,SOCK_STREAM,0);
    if(serv_sock == -1)
        error_handling("socket() error");

    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]));

    if(bind(serv_sock,(struct sockaddr*)&serv_adr,sizeof(serv_adr))==-1)
        error_handling("bind() error");

    if(listen(serv_sock,5)==-1)
        error_handling("listen() error");

    clnt_adr_sz = sizeof(clnt_adr);
    for(i=0;i<5;i++)
    {
        clnt_sock = accept(serv_sock,(struct sockaddr*)&clnt_adr,&clnt_adr_sz);
        if(clnt_sock == -1)
            error_handling("accpet() error");
        else
            printf("Connected client %d \n",++i);

        while((str_len=read(clnt_sock,message,BUF_SIZE))!=0)
            write(clnt_sock,message,str_len);
        close(clnt_sock);
    }
    close(serv_sock);
    return 0;
}

客户端

#include 
#include 
#include 
#include 
#include 
#include 

const int BUF_SIZE = 1024;

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

int main(int argc, char *argv[])
{
    int sock;
    char message[BUF_SIZE];
    int str_len;
    struct sockaddr_in serv_adr;

    if(argc != 3)
    {
        printf("Usage : %s   \n",argv[0]);
        exit(1);
    }

    sock = socket(PF_INET,SOCK_STREAM,0);
    if(sock == -1)
        error_handling("socket() error");

    memset(&serv_adr,0,sizeof(serv_adr));

    serv_adr.sin_family=AF_INET;
    serv_adr.sin_addr.s_addr=inet_addr(argv[1]);
    serv_adr.sin_port = htons(atoi(argv[2]));

    if(connect(sock,(struct sockaddr*)&serv_adr,sizeof(serv_adr))==-1)
        error_handling("connect() error");
    else
        puts("Connecte................");

    while(1)
    {
        fputs("inputs message(Q to quit): ",stdout);
        fgets(message,BUF_SIZE,stdin);

        if(!strcmp(message,"q\n") || !strcmp(message,"Q\n"))
            break;

        write(sock,message,strlen(message));
        str_len = read(sock,message,BUF_SIZE-1);
        message[str_len] = 0;
        printf("Message from server : %s ",message);
    }
    close(sock);
    return 0;
}

和Windows上的代码没有本质上的区别，除了serv_adr.sin_family = AF_INET，在Windows上这个值为PF_INET。
诸如hton、atoi、sin_family、sin_addr.s_addr、下一篇文章再说吧。