简单的TCP-Client

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <errno.h>int main(int argc, char *argv[]){    int sk, ret;    char buff[1024] = {'\0'};    struct sockaddr_in server;    sk = socket(AF_INET, SOCK_STREAM, 0);    if(sk == -1){        printf("%s\n", strerror(errno));        return -1;    }    server.sin_family = AF_INET;    server.sin_port = htons(3000);    server.sin_addr.s_addr = inet_addr("192.168.2.8");    ret = connect(sk, (struct sockaddr*)&server, sizeof(server));    if(ret != 0){        printf("%s\n", strerror(errno));        return -1;    }#if 0    ret = recv(sk, buff, sizeof(buff), 0);    if(ret < 0){        printf("send error\n");        return -1;    }else{        printf("the number read %d bytes\n", ret);    }    printf("%s\n", buff);#endif    ret = send(sk, "I am hahaya", strlen("I am hahaya") + 1, 0);    if(ret < 0){        printf("send error\n");        return -1;    }else{        printf("the number sent %d bytes\n", ret);    }    close(sk);    return 0;}