int main(void)
{
//signal(SIGCHLD, SIG_IGN);
signal(SIGPIPE,SIG_IGN);
signal(SIGCHLD, handle_sigchld);
int listenfd;
if ((listenfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
/* if ((listenfd = socket(PF_INET, SOCK_STREAM, 0)) < 0)*/
ERR_EXIT("socket");
struct sockaddr_in servaddr;
memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(8001);
//servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
/*inet_aton("127.0.0.1", &servaddr.sin_addr);*/
int on = 1;
if (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
ERR_EXIT("setsockopt");
if (bind(listenfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0)
ERR_EXIT("bind");
if (listen(listenfd, SOMAXCONN) < 0)
ERR_EXIT("listen");
struct sockaddr_in peeraddr;
socklen_t peerlen = sizeof(peeraddr);
int conn;
pid_t pid;
while (1)
{
if ((conn = accept(listenfd, (struct sockaddr*)&peeraddr, &peerlen)) < 0)
ERR_EXIT("accept");
printf("ip=%s port=%d\n", inet_ntoa(peeraddr.sin_addr), ntohs(peeraddr.sin_port));
pid = fork();
if (pid == -1)
ERR_EXIT("fork");
if (pid == 0)//child
{
close(listenfd);
echo_srv(conn);
exit(EXIT_SUCCESS);
}
else//father
{
//close(conn);//注意引用计数的问题
}
}
return 0;
}
//socket bind listen accept read write close
int main(int argc, const char *argv[])
{
signal(SIGCHLD, handle_sigchld);
//socket
int listen_fd = socket(AF_INET, SOCK_STREAM, 0);
if (listen_fd < 0)
ERR_EXIT("server socket");
//deal with timewait
int on = 1;
if (setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
ERR_EXIT("server setsockopt");
//bind
struct sockaddr_in server_addr;
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(8989);
server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
if (bind(listen_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
ERR_EXIT("server bind");
//listen
if (listen(listen_fd, SOMAXCONN) < 0)
ERR_EXIT("server listen");
//accept
int data_fd;
struct sockaddr_in peer_addr;
socklen_t peer_addr_len = sizeof(peer_addr);
while(1) {
if ((data_fd = accept(listen_fd, (struct sockaddr *)&peer_addr, &peer_addr_len)) < 0)
ERR_EXIT("server accept");
//print client's ip and port
printf("client's ip is :%s, port is :%d\n", inet_ntoa(peer_addr.sin_addr), ntohs(peer_addr.sin_port));
pid_t pid = fork();
if (pid < 0)
ERR_EXIT("fork");
else if (0 == pid) { //child
close(listen_fd);
echo_srv(data_fd);
close(data_fd);
exit(EXIT_SUCCESS);
}
//farther
close(data_fd);
}
//close
close(listen_fd);
return 0;
}
void* thread_routine(void *arg)
{
/* 主线程没有调用pthread_join等待线程退出 */
pthread_detach(pthread_self()); //剥离线程，避免产生僵线程
/*int conn = (int)arg;*/
int conn = *((int*)arg);
free(arg);
echo_srv(conn);
printf("exiting thread ...\n");
return NULL;
}
int main(void)
{
int sock;
if((sock = socket(PF_INET, SOCK_DGRAM, 0)) < 0)
ERR_EXIT("socket");
struct sockaddr_in servaddr;
memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(5188);
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
if(bind(sock, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0)
ERR_EXIT("bind");
echo_srv(sock);
return 0;
}
