【C语言】Linux下建立Socket连接

Linux下建立Socket连接：
 

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

#define SERVER_PORT 8080

void usage(char *name)
{
        printf("usage: %s IP\n", name);
}
int main(int argc, char **argv)
{
        int server_fd, client_fd, length = 0;
        struct sockaddr_in server_addr, client_addr;
        socklen_t socklen = sizeof(server_addr);

        if(argc < 2)
        {
                usage(argv[0]);
                exit(1);
        }
        if((client_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
        {
                printf("create socket error, exit!\n");
                exit(1);
        }
        srand(time(NULL));
        bzero(&client_addr, sizeof(client_addr));
        client_addr.sin_family = AF_INET;
        client_addr.sin_addr.s_addr = htons(INADDR_ANY);

        bzero(&server_addr, sizeof(server_addr));
        server_addr.sin_family = AF_INET;
        inet_aton(argv[1], &server_addr.sin_addr);
        server_addr.sin_port = htons(SERVER_PORT);

        if(connect(client_fd, (struct sockaddr*)&server_addr, socklen) < 0)
        {
                printf("can not connect to %s, exit!\n", argv[1]);
                printf("%s\n", strerror(errno));
                exit(1);
        }
        printf("Connect OK!\n");
        return 0;