linux下socket编程

struct sockaddr_in serv_addr, cli_addr;
bzero(&serv_addr, sizeof(serv_addr));  

sin.sin_family = AF_INET;
sin.sin_port = htons(6363); // 端口号
sin.sin_addr.s_addr = htonl(INADDR_ANY); // IP地址

// 避免绑定不成功
int on = 1;
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on , sizeof(int));

if( bind(listenfd,(struct sockaddr *)&serv_addr, sizeof(serv_addr)) == -1)
{
    perror("bind failed.\n");
    exit(1);
} 

if(listen(listenfd, n) == -1) // n代表监听的数量
{
    perror("listen failed\n");
    exit(1);
}

int clientfd;
// struct sockaddr_in cli_addr;
int len = sizeof(struct sockaddr);
clientfd= accept(serverfd, (struct sockaddr*)&cli_addr, &len);
if(clientfd == -1)
{
    perror("accept failed\n");
    exit(1);
}
else
    printf("accept succeed\n");

int sockfd;
struct sockaddr_in serv_addr;
host = gethostbyname("127.0.0.1");
sockfd = socket(AF_INET, SOCK_STREAM, 0);
bzero(&serv_addr, sizeof(struct sockaddr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(port); // port端口号
serv_addr.sin_addr = *((struct in_addr *)host->h_addr);

if(connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(struct sockaddr)) == -1)
{
    printf("connect failed\n");
    exit(1);
}
else
    printf("connect succeed \n");

send(sockfd, buf, strlen(buf), 0);

int recvNum;
char buf[BUF_SIZE]; // define BUF_SIZE 1024
if((recvNum = recv(sockfd, buf, BUF_SIZE, 0)) > 0)
{
    printf("recv: %s\n", buf);
}
else if(recvNum == -1)
{
    perror("recv -1");
    exit(1);
}

1.添加头文件
#include <pthread.h>
2.编译时添加参数
gcc -g xxx.c -o xxx -pthread

3.
pthread_t pid;
int sockfd;
pthread_create(&pid, NULL, (void*)recv_data,(void*)&sockfd);
其中:
void *recv_data(void *fd)
{
  int sockfd = *((int *)fd );
  ...
    while(1)
    {
        recv(...);    
    }
  
}