Multi-thread communication instance for C network programming in Linux

For a simple example, please refer to the following link for more information.

Server

/* ===================================================== ============================================================ Name: sockthreadserver. c Author: gaotong version: Copyright: Your copyright notice Description: Hello world in C, ANSI-style ========================================== ======================================================= * /# include <stdio. h> # include <stdlib. h> # include <sys/socket. h> # include <netinet/in. h> # include <ARPA/inet. h> # includ E <pthread. h> # include <sys/syscall. h> # include <unistd. h> # include <string. h> # define gettid () syscall (_ nr_gettid) // obtain the thread idvoid * handler_conn (void * Arg) {char send_str [100]; int client_sock_fd = * (int *) ARG; char recv_str [100]; // printf ("thread run success \ n"); While (1) {read (client_sock_fd, recv_str, 100 ); // Disconnect if (strcmp (recv_str, "exit") = 0) {break;} printf ("receive from % d: % s \ n", Client_sock_fd, recv_str); int id = gettid (); // get the thread idsprintf (send_str, "this is thread: % d, hello, client_sock_fd: % d \ n", ID, client_sock_fd); If (write (client_sock_fd, send_str, 100) =-1) {perror ("send error"); // The client closes the break connection ;} printf ("I said: % s \ n", send_str);} Free (ARG); puts ("disconnected \ n"); close (client_sock_fd ); pthread_exit (0);} int main (void) {int * client_sockfd; int server_len, client_len; struct sockaddr_in server_add RESS; struct sockaddr_in client_address; struct sockaddr_in tempaddr; server_address.sin_family = af_inet; region = htons (1991); region = inet_addr ("127.0.0.1 "); // create a socketint sock_fd = socket (af_inet, sock_stream, 0); // BIND (sock_fd, (struct sockaddr *) & server_address, sizeof (server_address )); listen (sock_fd, 20); While (1) {pthread_t thread; // each connection to a client is created One thread puts ("listening wait :............ \ N "); // client_sockfd needs to be passed to the thread as a pointer. So that each thread can control its own connection client_sockfd = (int *) malloc (sizeof (INT); client_len = sizeof (client_address); // int accept (INT socket, struct sockaddr * ADDR, socklen_t * plugin) * client_sockfd = accept (sock_fd, (struct sockaddr *) & client_address, (socklen_t *) & client_len); printf ("Client Connected! % D \ n ", * client_sockfd); pthread_create (& Thread, null, handler_conn, client_sockfd); puts (" thread creation \ n ");} return exit_success ;}

Client:

/* ===================================================== ============================================================ Name: sockthreadclient. c Author: gaotong version: Copyright: Your copyright notice Description: Hello world in C, ANSI-style ========================================== ======================================================= * /# include <stdio. h> # include <stdlib. h> # include <sys/socket. h> # include <netinet/in. h> # include <ARPA/inet. h> # includ E <pthread. h> # include <unistd. h> # include <string. h> int client_sockfd; char recv_str [100]; void * getmsg (void * Arg) {int test; while (test = read (client_sockfd, recv_str, 100 ))! = EOF) {If (test = 0) // The server closes the break connection; If (test =-1) {printf ("read error! "); Break;} printf (" received Server Message: % s \ n ", recv_str);} Close (client_sockfd); pthread_exit (0);} int main (void) {char char_send [100]; // create a socketclient_sockfd = socket (af_inet, sock_stream, 0); struct sockaddr_in serveraddr; // The server address serveraddr. sin_addr.s_addr = inet_addr ("127.0.0.1"); serveraddr. sin_family = af_inet; serveraddr. sin_port = htons (1991); Connect (client_sockfd, (struct sockaddr *) & serveraddr, sizeof (serveraddr); pthread_t pt; pthread_create (& PT, null, getmsg, null ); while (1) {gets (char_send); // read the data to be sent from the console // int send (INT socket, void * buffer, size_t size, int flags) if (send (client_sockfd, char_send, sizeof (char_send), 0) =-1) {break;} printf ("I said to the server: % s \ n ", char_send); If (strcmp (char_send, "exit") = 0) {// enter exit to exit break ;}} close (client_sockfd); Return exit_success ;}

Running result: