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Linux以下基于TCP多线程聊天室（server）

接上篇博文，本文是server端的实现，主要实现的功能，就是现实client的连接。转发client发送的消息。以及client掉线提示等功能，同一时候能够在这这上面扩展和TCP以及线程相关的功能木块。

tcpreceive.h

#ifndef TCPRECEIVE_H
#define TCPRECEIVE_H

#define BUFFSIZE 2048
#define listen_max 5

int cond;
int rscond;

typedef struct TCP_rcv_arg
{
    char *local_addr;
    int tcp_port;
}TCP_rcv_arg_t;

void stop_handler(int signum);

void *tcppackrecv(void *arg);

#endif

tcpreceive.c

#include "tcpreceive.h"

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <arpa/inet.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include <ctype.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <pthread.h>

void stop_handler(int sinnum)
{
    cond = 0;
    rscond = 0;
}

void *tcppackrecv(void *arg)
{
    int listen_fd,client_id,len = 1;
    struct sockaddr_in server_addr;
    struct sockaddr_in client_addr;
    int sin_size;
    fd_set master;
    fd_set read_fds;
    int fdmax,i,newfd,j;
    char buf[BUFFSIZE + 1];

    TCP_rcv_arg_t *rcv_arg = (TCP_rcv_arg_t *)arg;

    sin_size = sizeof(client_addr);

    if(-1 == (listen_fd = socket(AF_INET,SOCK_STREAM,0)))
    {
        fprintf(stderr,"Socket Error:%s
",strerror(errno));
        pthread_exit(NULL);
    }

    memset(&server_addr,0,sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    //server_addr.sin_addr.s_addr = inet_addr((*rcv_arg).local_addr);
    server_addr.sin_port = htons((*rcv_arg).tcp_port);
    setsockopt(listen_fd,SOL_SOCKET,SO_REUSEADDR,&len,sizeof(len));

    if( -1 == bind(listen_fd,(struct sockaddr *)&server_addr,sizeof(server_addr)))
    {
        fprintf(stderr,"Bind Error:%s
",strerror(errno));
        pthread_exit(NULL);
    }

    if(-1 == listen(listen_fd,listen_max))
    {
        fprintf(stderr,"Listen Error:%s
",strerror(errno));
        pthread_exit(NULL);
    }
    //printf("listen ok!
");

    FD_ZERO(&master);
    FD_ZERO(&read_fds);
    FD_SET(listen_fd,&master);
    fdmax = listen_fd;


    cond = 1;

    while(cond)
    {
        read_fds = master;
		
        if(-1 == select(fdmax+1,&read_fds,NULL,NULL,NULL))
        {
            fprintf(stderr,"Server Select Error:%s
",strerror(errno));
            pthread_exit(NULL);
        }
		
        for(i = 0;i <= fdmax;i++)
        {
            if(FD_ISSET(i,&read_fds))
            {
                if(i == listen_fd)
                {
                    if(-1 == (newfd = accept(listen_fd,(struct sockaddr *)&client_addr,(socklen_t *)&sin_size)))
                    {
                        fprintf(stderr,"Accept Error:%s
",strerror(errno));
                    }
                    else
                    {
                        FD_SET(newfd,&master);
                        if(newfd > fdmax)
                        {
                            fdmax = newfd;
                        }
                        sprintf(buf,"Your SocketID is:%d.",newfd);
                        if(send(newfd,buf,21,0) < 0)
                        {
                            printf("Send Error!
");
                        }
                        printf("there is a new connection in,form %s,SocketID is %d.
",inet_ntoa(client_addr.sin_addr),newfd);
                    }
                }
                else
                {
                    sprintf(buf,"Form %2d:
",i);
                    if((len = recv(i,buf + 9,BUFFSIZE - 10,0)) <= 0)
                    {
                        if(0 == len)
                        {
                            printf("SocketID %d has left!
",i);
                        }
                        else
                        {
                            perror("the recv() go end!
");
                        }
                        close(i);
                        FD_CLR(i,&master);
                    }
                    else
                    {
                        len += 9;
                        buf[len] = '';
                        printf("%s
",buf);
                        for(j = 0;j <= fdmax;j++)
                        {
                            if(FD_ISSET(j,&master) && j != listen_fd && j !=i)
                            {
                                if(-1 == send(j,buf,len,0))
                                {
                                    perror("Send() error!
");
                                }
                            }
                        }
                    }
                }
            }
        }
    }
    pthread_exit(NULL);
}

server.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <pthread.h>
#include <errno.h>

#include "tcpreceive.h"

#define PORT 8888
#define IP "192.168.1.220"

int main()
{
    pthread_t tid;
    pthread_t id;
    void *tret;
    TCP_rcv_arg_t rcv_arg;

    rcv_arg.tcp_port = PORT;
    rcv_arg.local_addr = IP;
    printf("the main process!
");

    int i= pthread_create(&tid,NULL,(void *)tcppackrecv,(void *)&rcv_arg);
    if( i != 0)
    {
        printf("Create pthread error!
");
        pthread_exit(NULL);
    }
    
    if (0 != pthread_join(tid, &tret))
    {
        printf("Join pthread error!
");
    }

    return 0;
}

为了大家编译方便，将Makefile也放上来：

all:
	gcc -c tcpsed.c
	ar cr libtcpsed.a tcpsed.o
	gcc -c tcpreceive.c 
	ar cr libtcpreceive.a tcpreceive.o
	gcc -o server server.c -L. -ltcpreceive -lpthread
	gcc -o client client.c -L. -ltcpsed -lpthread

clean:
	rm -rf *.o *.a server client

CSDN上面源代码下载地址：

http://download.csdn.net/detail/u012377333/8079943

all:
	gcc -c tcpsed.c
	ar cr libtcpsed.a tcpsed.o
	gcc -c tcpreceive.c 
	ar cr libtcpreceive.a tcpreceive.o
	gcc -o server server.c -L. -ltcpreceive -lpthread
	gcc -o client client.c -L. -ltcpsed -lpthread

clean:
	rm -rf *.o *.a server client

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原文地址：https://www.cnblogs.com/cxchanpin/p/6851719.html