linux网络编程之tcp模板

来源：互联网发布：linux磁盘空间扩容编辑：程序博客网时间：2024/06/07 18:18

/* client  */#include <stdio.h>#include <stdlib.h>#include <sys/types.h>#include <sys/socket.h>#include <netdb.h>#include <sys/socket.h>#include <netinet/in.h>#include <netinet/ip.h> int main(int argc, char *argv[]){    int portnumber = 0;    int sockfd = -1;    struct hostent *host;    struct sockaddr_in serveraddr;    char buf[1024] = {0};    if (3 != argc || 0 > (portnumber = atoi(argv[2]))){        printf("Usage:%s hostname portnumber\n", argv[0]);        exit(1);    }    if (NULL == (host = gethostbyname(argv[1]))){        perror("gethostname error");        exit(1);    }        if (-1 == (sockfd = socket(AF_INET, SOCK_STREAM, 0))){        perror("socket error");        exit(1);    }    bzero(&serveraddr, sizeof(serveraddr));    serveraddr.sin_family = AF_INET;    serveraddr.sin_port = htons(portnumber);    serveraddr.sin_addr = *((struct in_addr *)host->h_addr);    if (-1 == connect(sockfd, (struct sockaddr *)&serveraddr, sizeof(struct sockaddr))){        perror("connect error:");        exit(1);    }    if (-1 == read(sockfd, buf, 1024)){        perror("recv error:");    }    printf("data arrived:%s\n", buf);    close(sockfd);    return 0;}

/* server */#include <stdio.h>#include <stdlib.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <netinet/ip.h> int main( int argc, char *argv[]){    int portnumber = 0;    int sockfd = -1;    int clientfd = -1;    int addrlen = 0;    struct sockaddr_in serveraddr, clientaddr;    if (2 != argc || 0 > (portnumber = atoi(argv[1]))){        printf("Usage: %s port \n", argv[0]);        exit(1);    }        sockfd = socket(AF_INET, SOCK_STREAM, 0);    if (-1 == sockfd){        perror("socket error:");        exit(1);    }    bzero(&serveraddr, sizeof(serveraddr));    serveraddr.sin_family = AF_INET;    serveraddr.sin_port = htons(portnumber);    serveraddr.sin_addr.s_addr = INADDR_ANY;    if (-1 == bind(sockfd, (struct sockaddr *)(&serveraddr), sizeof(serveraddr))){        perror("bind error:");        exit (1);    }    if (-1 == listen(sockfd, 4)){        perror("listen error:");        exit(1);    }    while (1){        addrlen = sizeof(struct sockaddr_in);        if (-1 == (clientfd = accept(sockfd, (struct sockaddr*)&clientaddr, &addrlen))){            perror("accept error");            exit(1);        }            printf("connect from %s:%u ...\n", inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));            if (-1 == write(clientfd, "hello", strlen("hello"))){                perror("write error");                exit(1);            }            close(clientfd);    }    close(sockfd);    return 0;}

原文：http://blog.chinaunix.net/uid-23069658-id-3273673.html

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