tcp 客户、服务器程序示例

来源：互联网发布：sony手机知乎编辑：程序博客网时间：2024/04/28 14:53

1）client 从标准输入读入一行文本，并写给服务器。
2）服务器从网络输入读入这行文本，并回射给客户。
3）客户从网络输入读入这行回射的文本，显示在标准输出上

标准输入—–fgets—-> tcp 客户—write——————-read–>tcp 服务器

标准输出<—-fputs—–tcp 客户<—read——————-write—tcp 服务器

client 代码

#include <stdio.h>#include <sys/types.h>          /* See NOTES */#include <sys/socket.h>#include <arpa/inet.h>#include <unistd.h>#include <string.h>void str_cli(FILE *fp, int sockfd){    char sendline[1024], recvline[1024];    while( fgets(sendline, 1024, fp) != NULL )    {        write(sockfd, sendline, strlen(sendline));        if(read(sockfd, recvline, 1024) <= 0 )        {            printf("server terminated\n");        }        fputs(recvline, stdout);    }}int main(int argc , char** argv){    int sockfd;    struct sockaddr_in seraddr;    if(argc !=2)    {        printf("argc error\r\n");    }    if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)    {        printf("socket error\r\n");    }    bzero(&seraddr, sizeof(seraddr));    seraddr.sin_family = AF_INET;    seraddr.sin_port = htons(13000);    if((inet_pton(AF_INET, argv[1], &seraddr.sin_addr)) < 0)    {        printf("inet_pton error\r\n");    }    if(connect(sockfd, (struct sockaddr*)&seraddr, sizeof(seraddr)) < 0)    {        printf("connect error\r\n");    }    str_cli(stdin, sockfd);    return 0;}

server 代码

#include <time.h>#include <sys/types.h>          /* See NOTES */#include <sys/socket.h>#include <string.h>#include <unistd.h>#include <stdio.h>#include <arpa/inet.h>#include <stdlib.h>void str_echo(int sockfd){    ssize_t n;    char buf[1024];    while((n = read(sockfd, buf, 1024)) > 0 )    {        write(sockfd, buf, n);    }    if(n < 0)    {        printf("read error\r\n");    }}int main(int argc, char** argv){    int listenfd, connectfd;    socklen_t client_len;    struct sockaddr_in servaddr, client_addr;    pid_t childpid;    if((listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)    {        printf("sock error\r\n");        return 0;    }    bzero(&servaddr, sizeof(servaddr));    servaddr.sin_family = AF_INET;    servaddr.sin_port = htons(13000);    servaddr.sin_addr.s_addr = inet_addr("0.0.0.0");    if( bind(listenfd, (struct sockaddr* )&servaddr, sizeof(servaddr)) < 0)    {        printf("bind error\r\n");        return 0;    }    if(listen(listenfd, 0) < 0)    {        printf("listen error\r\n");        return 0;    }    for( ; ;)    {        client_len = sizeof(client_addr);        connectfd = accept(listenfd, (struct sockaddr*)&client_addr, &client_len);        if( (childpid = fork())== 0)        {            close(listenfd);            str_echo(connectfd);            exit(0);        }        close(connectfd);    }}

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