socket学习笔记——线程（聊天程序）

server.c

#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>
",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 
",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('
',stderr);
    exit(1);
}

client.c

#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>
");
        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
") || !strcmp(msg,"Q
"))
        {
            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('
',stderr);
    exit(1);
}