TCP thread Server 練習

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void * serverthread(void * parm);
pthread_mutex_t mut;
#define SERVERPORT 2140
#define QLEN 10
int client_counter = 0;
main(int argc, char *argv[])
{
struct hostent *phost;
struct protoent *pprotocol;
struct sockaddr_in serveraddr;
struct sockaddr_in clientaddr;
int sockfd, sockfd2;
int port;
int alen;
pthread_t tid;
pthread_mutex_init(&mut, NULL);
memset((char *)&serveraddr, 0, sizeof(serveraddr));
serveraddr.sin_family = AF_INET;
serveraddr.sin_addr.s_addr =INADDR_ANY;
if (argc > 1){
port = atoi(argv[1]);
}else{
port = SERVERPORT;
}
if(port > 0)
serveraddr.sin_port = htons((u_short)port);
else{
fprintf(stderr, "bad port number %s\n", argv[1]);
return 0;
}
if (((int)(pprotocol = getprotobyname("tcp"))) == 0){
fprintf(stderr, "cannot map \"tcp\" to protocol number");
return 0;
}
sockfd = socket(PF_INET, SOCK_STREAM, pprotocol->p_proto);
if (sockfd < 0){
fprintf(stderr, "socket creation failed\n");
return 0;
}
if (bind(sockfd, (struct sockaddr *)&serveraddr,sizeof(serveraddr)) < 0){
fprintf(stderr, "bind failed\n");
return 0;
}
if (listen(sockfd, QLEN) < 0){
fprintf(stderr, "listen failed\n");
return 0;
}
alen = sizeof(clientaddr);
while (1)
{
printf("SERVER: Waiting for clients...\n");
if ((sockfd2 = accept(sockfd, (struct sockaddr *)&clientaddr, &alen)) < 0){
fprintf(stderr, "accept failed\n");
exit(0);
}
pthread_create(&tid, NULL, serverthread, (void*)sockfd2);
}
close(sockfd);
}
void * serverthread(void * parm)
{
int tsockfd, tclient_counter;
char buffer[100];
tsockfd = (int)parm;
pthread_mutex_lock(&mut);
tclient_counter = ++client_counter;
pthread_mutex_unlock(&mut);
sprintf(buffer, "This server has been contacted %d time %s\n", 
tclient_counter, tclient_counter==1?".":"s.");
printf("SERVER thread: %s", buffer);
send(tsockfd, buffer, strlen(buffer), 0);
close(tsockfd);
pthread_exit(0);
}

gcc -o thread_server thread_server.c -lpthread
./thread_server

telnet localhost 2140