TCP并发服务器多进程

service

#include<stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>

#include<unistd.h>
#include<string.h>
#include<strings.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include<stdlib.h>
#define PORT 5001
#define STR_QUIT "quit"
void child_data_handle(int signum)
{
        if(SIGCHLD == signum)
        {
                waitpid(-1,NULL,WNOHANG);
        }

}
void* client_data_handle(void* arg);

int main()
{

        int fd = -1;
        int newfd = -1;
        pid_t pid;

        signal(SIGCHLD,child_data_handle);

        fd = socket(AF_INET,SOCK_STREAM,0);
        if(fd<0)
        {
                perror("socket");
                exit(1);
        }

        struct sockaddr_in sin;
        bzero(&sin,sizeof(sin));
        sin.sin_family = AF_INET;
        sin.sin_port = htons(PORT);
        sin.sin_addr.s_addr = INADDR_ANY;

        if(bind(fd,(struct sockaddr *)&sin,sizeof(sin))<0)
        {
                perror("bind");
                exit(1);

        }

        if(listen(fd,5)<0)
        {
                perror("listen");
                exit(1);
        }
        pid_t pid;

        int newfd = -1;
        struct sockaddr_in cin;
        bzero(&sin,sizeof(cin));
        socklen_t sockaddr_len = sizeof(cin);

        while(1)
        {
                newfd = accept(fd,(struct sockaddr *)&cin.sin_addr,&sockaddr_len);
                        if(newfd<0)
                        {
                                perror("accept");
                                exit(1);
                        }

                pid = fork();

                if(pid<0)
                {
                        perror("fork");
                        exit(1);
                }
                if(pid == 0)
                {

                        char ipv4[16];

                        if(!inet_ntop(newfd,(void *)&cin.sin_addr,ipv4,sizeof(cin)))
                        {
                                perror("inet_ntop");
                                exit(1);
                        }
                        printf("client (%s,%d) is connect\n",ipv4,ntohs(cin.sin_port));


                        client_data_handle(&newfd);
                        close(fd);
                }

                if(pid>0)

                {
                        close(newfd);
                }

        }
        close(fd);
        return 0;
}

void* client_data_handle (void* arg)

{
        char buf[1024];
        int newfd = *(int*)arg;
        int ret =-1;
        printf("child handle process:newfd = %d\n",newfd);
        while(1)
        {

                do{
                        ret = read(newfd,&buf,1023);


                }while(ret<1);

                if(!ret)
                {
                        break;
                }
                if(ret<0)
                {
                        exit(1);
                }

                printf("receive data is %s\n",buf);
                if(!strncasecmp(buf,STR_QUIT,strlen(STR_QUIT)))
                {
                        printf("client is exiting!");
                        break;
                }
        }

}

client

#include<stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h> /* superset of previous */
#include<stdlib.h>
#include <strings.h>
#include<unistd.h>

#include <string.h>

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <sys/types.h>          /* See NOTES */
#include <sys/socket.h>
//./client 192.168.182.144 5001




#define SERV_PORT 5001
#define SERV_IP_ADDR "192.168.157.34"
#define BUFSIZE 1024
#define QUIT_STR "QUIT"


int main(int argc,char **argv)
{
        int fd = -1;
        if(argc!=3)
        {
        exit(1);
        }
        int port = -1;
        port = atoi(argv[2]);
        fd = socket(AF_INET,SOCK_STREAM,0);
        if(fd<0)
        {

                perror("socket");
                exit(1);
        }

        struct sockaddr_in sin;
      bzero(&sin,sizeof(sin));
        sin.sin_family = AF_INET;
        sin.sin_port = htons(port);
        sin.sin_addr.s_addr = inet_addr(argv[1]);

        if(connect(fd,(struct sockaddr*)&sin,sizeof(sin))<0)
        {
                perror("connect");
                exit(1);
        }
        char buf[BUFSIZE];
        while(1)
        {
                bzero(buf,BUFSIZE);
                if(fgets(buf,BUFSIZE-1,stdin)==NULL)
                {
                        continue;
                }
               write(fd,buf,strlen(buf));
                if(!strncasecmp(buf,QUIT_STR,strlen(QUIT_STR)))
                {

                        break;
                }


        }
        return 0;


}

结果