socket学习笔记——线程（聊天程序）

#include <stdio.h>
#include <pthread.h>
#include <semaphore.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <string.h>

#define BUF_SIZE 100
#define MAX_CLNT 256

void *handle_clnt(void* arg);
void send_msg(char *msg,int len);
void error_handling(char* message);

int clnt_cnt = 0;
int clnt_socks[MAX_CLNT];
pthread_mutex_t mutx;

int main(int argc,char* argv[])
{
int serv_sock,clnt_sock;
struct sockaddr_in serv_addr,clnt_addr;
int adr_sz;
pthread_t t_id;

if(argc != 2)
{
printf("usage: %s <port>\n",argv[0]);
exit(1);
}

pthread_mutex_init(&mutx,NULL);
serv_sock = socket(PF_INET,SOCK_STREAM,0);
memset(&serv_addr,0,sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_addr.sin_port = htons(atoi(argv[1]));

if(bind(serv_sock,(struct sockaddr*)&serv_addr,sizeof(serv_addr)) == -1)
error_handling("bind error");
if(listen(serv_sock,5) == -1)
error_handling("listen error");

while(1)
{
adr_sz = sizeof(clnt_addr);
clnt_sock = accept(serv_sock,(struct sockaddr*)&clnt_addr,&adr_sz);

pthread_mutex_lock(&mutx);
clnt_socks[clnt_cnt++] = clnt_sock;
pthread_mutex_unlock(&mutx);

pthread_create(&t_id,NULL,handle_clnt,(void*)&clnt_sock);
pthread_detach(t_id);
printf("connected client ip:%s \n",inet_ntoa(clnt_addr.sin_addr));
}
close(serv_sock);
return 0;
}

void* handle_clnt(void* arg)
{
int clnt_sock = *((int*)arg);
int str_len = 0,i;
char msg[BUF_SIZE];

while((str_len = read(clnt_sock,msg,sizeof(msg))) != 0)
send_msg(msg,str_len);
pthread_mutex_lock(&mutx);
for(i = 0;i < clnt_cnt;i++)
{
if(clnt_sock == clnt_socks[i])
{
while(i++ < clnt_cnt-1)
clnt_socks[i] = clnt_socks[i+1];
break;
}
}
clnt_cnt--;
pthread_mutex_unlock(&mutx);
close(clnt_sock);
return NULL;
}

void send_msg(char* msg,int len)
{
int i;
pthread_mutex_lock(&mutx);
for(i = 0;i < clnt_cnt;i++)
write(clnt_socks[i],msg,len);
pthread_mutex_unlock(&mutx);
}
void error_handling(char* message)
{
fputs(message,stderr);
fputc('\n',stderr);
exit(1);
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <sys/socket.h>

#define BUF_SIZE 200
#define NAME_SIZE 20

void *send_msg(void* arg);
void *recv_msg(void* arg);
void error_handling(char* message);

char name[NAME_SIZE] = "[DEFAULT]";
char msg[BUF_SIZE];
int main(int argc,char* argv[])
{
int sock;
struct sockaddr_in serv_addr;
pthread_t send_thread,recv_thread;
void * thread_return;

if(argc != 4)
{
printf("usage: %s <ip> <port> <name>\n");
exit(1);
}

sprintf(name,"[%s]",argv[3]);
sock = socket(PF_INET,SOCK_STREAM,0);

memset(&serv_addr,0,sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = inet_addr(argv[1]);
serv_addr.sin_port = htons(atoi(argv[2]));

if(connect(sock,(struct sockaddr*)&serv_addr,sizeof(serv_addr)) == -1)
error_handling("connect error");

pthread_create(&send_thread,NULL,send_msg,(void*)&sock);
pthread_create(&recv_thread,NULL,recv_msg,(void*)&sock);
pthread_join(send_thread,&thread_return);
pthread_join(recv_thread,&thread_return);
close(sock);
return 0;
}

void* send_msg(void* arg)
{
int sock = *((int*)arg);
char name_msg[NAME_SIZE+BUF_SIZE];
while(1)
{
fgets(msg,BUF_SIZE,stdin);
if(!strcmp(msg,"q\n") || !strcmp(msg,"Q\n"))
{
close(sock);
exit(0);
}
sprintf(name_msg,"%s %s",name,msg);
write(sock,name_msg,strlen(name_msg));
}
return NULL;
}

void* recv_msg(void* arg)
{
int sock = *((int*)arg);
char name_msg[BUF_SIZE+NAME_SIZE];
int str_len;
while(1)
{
str_len = read(sock,name_msg,NAME_SIZE+BUF_SIZE-1);
if(str_len == -1)
return (void*)-1;
name_msg[str_len] = 0;
fputs(name_msg,stdout);
}
return NULL;
}

void error_handling(char* message)
{
fputs(message,stderr);
fputc('\n',stderr);
exit(1);
}