linux socket头文件

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <unistd.h>

#include <netdb.h>

#include <errno.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>

int main(int argc, char *argv[]) {
    int sockfd;
    struct sockaddr_in server_addr;

    if (argc != 3) {
        fprintf(stderr, "Usage: %s<ip> <port>\n", argv[0]);
        exit(EXIT_FAILURE);
    }

    // 创建socket
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket");
        exit(EXIT_FAILURE);
    }

    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(atoi(argv[2]));
    if (inet_pton(AF_INET, argv[1], &server_addr.sin_addr) <= 0) {
        perror("inet_pton");
        close(sockfd);
        exit(EXIT_FAILURE);
    }

    // 连接服务器
    if (connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
        perror("connect");
        close(sockfd);
        exit(EXIT_FAILURE);
    }

    printf("Connected to server %s:%s\n", argv[1], argv[2]);

    // 发送和接收数据...

    close(sockfd);
    return 0;
}