服務端

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


char* nam[50];
int count = 0;
int cfd[50];
int clifd = 0
 
;

void* pthread_chat(void* arg)
{
    int *p = arg;
    int n = *p;
    while(1)
    {
        char buf[255] = {};
        if (-1 == recv(cfd[n],buf,sizeof(buf),0))
        {
            close(cfd[n]);
            cfd[n] = 0;
            break;
        }
        for (int i = 0; i < count+1; ++i)
        {
            
 
if (cfd[i] != 0)
            {
                send(cfd[i],buf,sizeof(buf),0);
            }
        }
    }
}

int main(int argc,char* argv[])
{
    int sockfd = socket(AF_INET,SOCK_STREAM,0);
    if (0 > sockfd)
    {
        perror("socket");
        return -1;
    }
    struct  sockaddr_in addr = {AF_INET};
    addr.sin_port 
 
= htons(5566);
    addr.sin_addr.s_addr = inet_addr("192.168.2.120");
    int ret = bind(sockfd,(struct sockaddr*)&addr,sizeof(addr));
    if (0 > ret)
    {
        perror("bind");
        return -1;
    }
    listen(sockfd,1024); 
    struct sockaddr_in src_addr = {};
    socklen_t addr_len = sizeof(src_addr);
    while(1)
    {
        clifd = accept(sockfd,(struct sockaddr*)&src_addr,&addr_len);
        int flag = 0;
        while(clifd != 0)
        {
            for (int i = 0; i < count+1; ++i)
            {
                if(cfd[count] == 0)
                {
                    flag = 1;
                    cfd[count] = clifd;
                    pthread_t ptid;
                    pthread_create(&ptid,NULL,pthread_chat,&count);
                }    
            }
            if (flag == 0)
            {
                cfd[++count] = clifd;
                pthread_t ptid;
                pthread_create(&ptid,NULL,pthread_chat,&count);
            }
            clifd = 0;
        }
    }
    close(sockfd);
}

客戶端

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <unistd.h>


int main(int argc,char* argv[])
{
	int sockfd = socket(AF_INET,SOCK_STREAM,0);
	if (0 > sockfd)
	{
		perror("socket");
		return -1;
	}
	struct  sockaddr_in addr = {AF_INET};
	addr.sin_port = htons(atoi(argv[1]));
	addr.sin_addr.s_addr = inet_addr(argv[2]);

	int ret = connect(sockfd,(struct sockaddr*)&addr,sizeof(addr));
	if (0 > ret)
	{
		perror("connect");
		return -1;
	}
	if (fork() == 0)
	{
		while(1)
		{
			char buf[255] = {};
			recv(sockfd,buf,sizeof(buf),0);
			printf("%s\n",buf);
		}		
	}
	while(1)
	{
	
		char buf[255] = {};
		char data[255] = {};
		gets(data);
		sprintf(buf,"%s:%s",argv[3],data);
		send(sockfd,buf,strlen(buf),0);	
	}
	close(sockfd);
}

Linux下基於Socket網絡通信的多人聊天室