linux c语言socket编程实例（1server-nclient），一个服务器，多个客户端

服务器端代码：

/**************************************************
##filename : server.c
##author : GYZ
##e-mail : [email protected]
##create time : 2018-07-23 10:41:42
##last modified : 2018-07-26 13:27:19
##description : NA
**************************************************/

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

void pthread_func(int*);

int main(int argc,char *argv[])
{
int server_sockfd;
int client_sockfd;
int ret;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
socklen_t server_addrlen;
socklen_t client_addrlen;
int on = 1;

char buf[20];

/*1,create a socket*/
/*IPPROTO=0,dumserver protocol for TCP*/
server_sockfd = socket(AF_INET,SOCK_STREAM,0);
if(-1 == server_sockfd)
{
perror("socket"),exit(-1);
}
/*1.5 enable address reuse*/
ret = setsockopt(server_sockfd,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on));
/*2,bind the socket with an ip*/
memset(&server_addr,0,sizeof(struct sockaddr_in));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(3490);
server_addr.sin_addr.s_addr = inet_addr("172.23.7.179");
server_addrlen = sizeof(struct sockaddr);
ret = bind(server_sockfd,(const struct sockaddr*)&server_addr,server_addrlen);
if(-1 == ret)
{
perror("bind"),exit(-1);
}
/*3,listen the socket*/
ret = listen(server_sockfd,6);
if(-1 == ret)
{
perror("listen"),exit(-1);
}
while(1)
{
/*4,accept the data from the client*/
client_addrlen = sizeof(struct sockaddr);
client_sockfd = accept(server_sockfd,(struct sockaddr *)&client_addr,&client_addrlen);
if(client_sockfd > 0)
{
   printf("IP is %s\n",inet_ntoa(client_addr.sin_addr));
   printf("Port is %d\n",ntohs(client_addr.sin_port));
           pthread_t pt;
           printf("%d\n",client_sockfd);
           ret = pthread_create(&pt,NULL,(void *)pthread_func,&client_sockfd);
           if(0 != ret)
           {
               printf("ip:%s connect failed",inet_ntoa(client_addr.sin_addr));
           }

pthread_join(pt,(void*)buf);
}
}
close(server_sockfd);
return 0;
}
void pthread_func(int* p_client_sockfd)
{
   int client_sockfd = *p_client_sockfd;
   printf("%d\n",client_sockfd);
   int ret;
char data[100];
   char data1[100];
while(1)
{
/*5,read the data from client*/
ret = recv(client_sockfd,data,100,0);
if(-1 == ret)
{
perror("recv"),exit(-1);
}
printf("data from client:%s\n",data);
       /*6,send the data to client*/
       printf("server send data:");
       scanf("%s",data1);
       ret = send(client_sockfd,data1,100,0);
       if(-1 == ret)
       {
           perror("send"),exit(-1);
       }
   }
pthread_exit(0);
}
客户端代码：

/**************************************************
##filename : client.c
##author : GYZ
##e-mail : [email protected]
##create time : 2018-07-23 16:36:34
##last modified : 2018-07-26 13:14:36
##description : NA
**************************************************/

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

int main(int argc,char *argv[])
{
int client_sockfd;
struct sockaddr_in client_addr;
socklen_t client_addrlen;
char data[20];
char data1[20];
int ret;

/*1,create a socket*/
client_sockfd = socket(AF_INET,SOCK_STREAM,0);
if(-1 == client_sockfd)
{
perror("socket"),exit(-1);
}
/*2,connect to the server*/
memset(&client_addr,0,sizeof(struct sockaddr));
client_addr.sin_family = AF_INET;
client_addr.sin_port = htons(3490);
client_addr.sin_addr.s_addr = inet_addr("172.23.7.179");
client_addrlen = sizeof(struct sockaddr);
ret = connect(client_sockfd,(const struct sockaddr *)&client_addr,client_addrlen);
if(-1 == ret)
{
perror("connect"),exit(-1);
}
while(1)
{
       /*3,send the data to server*/
printf("client data are :");
scanf("%s",data);
ret = send(client_sockfd,data,20,0);
if(-1 == ret)
{
perror("write"),exit(-1);
}
       /*4,receive the data from server*/
       ret = recv(client_sockfd,data1,100,0);
       if(-1 == ret)
       {
           perror("recv"),exit(-1);
       }
       printf("data from server:%s\n",data1);
}
close(client_sockfd);
return 0;
}

makefile文件：

all:server client

CC = gcc
SRC1 = server.c
SRC2 = client.c
OBJE1 = server
OBJE2 = client

${OBJE1}:
${CC} ${SRC1} -o ${OBJE1} -pthread
${OBJE2}:
${CC} ${SRC2} -o ${OBJE2} -pthread

.PHONY:clean
clean :
rm ${OBJE1} ${OBJE2}
参考：https://blog.csdn.net/returningprodigal/article/details/51916754

这篇文章写的比较全，不过对初学者略复杂，我抽出主要部分，方便理解

说明：

1，pthread_create()函数是创建一个新线程；

2，pthread_exit()函数是终止该线程；

3，pthread_join()函数是回收结束线程的资源；

4，pthread_kill()函数传递信号，并非是杀死线程，第二个参数为0时，表示检查该线程是不是结束了。

linux c语言socket编程实例（1server-nclient），一个服务器，多个客户端

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