嵌入式学习L6网络编程D4多进程并发

多线程

客户端

/*./client serv_ip serv_port */
#include "net.h"void usage (char *s)
{printf ("\n%s serv_ip serv_port", s);printf ("\n\t serv_ip: server ip address");printf ("\n\t serv_port: server port(>5000)\n\n");
}int main (int argc, char **argv)
{int fd = -1;int port = -1;struct sockaddr_in sin;if (argc != 3) {usage (argv[0]);exit (1);}/* 1. 创建socket fd */if ((fd = socket (AF_INET, SOCK_STREAM, 0)) < 0) {perror ("socket");exit (1);}port = atoi (argv[2]);if (port < 5000) {usage (argv[0]);exit (1);}/*2.连接服务器 *//*2.1 填充struct sockaddr_in结构体变量 */bzero (&sin, sizeof (sin));sin.sin_family = AF_INET;sin.sin_port = htons (port);	//网络字节序的端口号
#if 0sin.sin_addr.s_addr = inet_addr (SERV_IP_ADDR);
#elseif (inet_pton (AF_INET, argv[1], (void *) &sin.sin_addr) != 1) {perror ("inet_pton");exit (1);}
#endifif (connect (fd, (struct sockaddr *) &sin, sizeof (sin)) < 0) {perror ("connect");exit (1);}printf ("Client staring...OK!\n");/*3. 读写数据 */char buf[BUFSIZ];int ret = -1;while (1) {bzero (buf, BUFSIZ);if (fgets (buf, BUFSIZ - 1, stdin) == NULL) {continue;}do {ret = write (fd, buf, strlen (buf));} while (ret < 0 && EINTR == errno);if (!strncasecmp (buf, QUIT_STR, strlen (QUIT_STR))) {	//用户输入了quit字符printf ("Client is exiting!\n");break;}}/*4.关闭套接字 */close (fd);
}

atoi是转换成整数

服务器

#include <pthread.h>
#include "net.h"void cli_data_handle (void *arg);int main (void)
{int fd = -1;struct sockaddr_in sin;/* 1. 创建socket fd */if ((fd = socket (AF_INET, SOCK_STREAM, 0)) < 0) {perror ("socket");exit (1);}/*优化4： 允许绑定地址快速重用 */int b_reuse = 1;setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &b_reuse, sizeof (int));/*2. 绑定 *//*2.1 填充struct sockaddr_in结构体变量 */bzero (&sin, sizeof (sin));sin.sin_family = AF_INET;sin.sin_port = htons (SERV_PORT);	//网络字节序的端口号/*优化1: 让服务器程序能绑定在任意的IP上 */
#if 1sin.sin_addr.s_addr = htonl (INADDR_ANY);
#elseif (inet_pton (AF_INET, SERV_IP_ADDR, (void *) &sin.sin_addr) != 1) {perror ("inet_pton");exit (1);}
#endif/*2.2 绑定 */if (bind (fd, (struct sockaddr *) &sin, sizeof (sin)) < 0) {perror ("bind");exit (1);}/*3. 调用listen()把主动套接字变成被动套接字 */if (listen (fd, BACKLOG) < 0) {perror ("listen");exit (1);}printf ("Server starting....OK!\n");int newfd = -1;/*4. 阻塞等待客户端连接请求 *//* 优化： 用多进程/多线程处理已经建立号连接的客户端数据 */pthread_t tid;struct sockaddr_in cin;socklen_t addrlen = sizeof (cin);while (1) {if ((newfd = accept (fd, (struct sockaddr *) &cin, &addrlen)) < 0) {perror ("accept");exit (1);}char ipv4_addr[16];if (!inet_ntop (AF_INET, (void *) &cin.sin_addr, ipv4_addr, sizeof (cin))) {perror ("inet_ntop");exit (1);}printf ("Clinet(%s:%d) is connected!\n", ipv4_addr, htons (cin.sin_port));pthread_create (&tid, NULL, (void *) cli_data_handle, (void *) &newfd);}close (fd);return 0;
}void cli_data_handle (void *arg)
{int newfd = *(int *) arg;printf ("handler thread: newfd =%d\n", newfd);//..和newfd进行数据读写int ret = -1;char buf[BUFSIZ];while (1) {bzero (buf, BUFSIZ);do {ret = read (newfd, buf, BUFSIZ - 1);} while (ret < 0 && EINTR == errno);if (ret < 0) {perror ("read");exit (1);}if (!ret) {				//对方已经关闭break;}printf ("Receive data: %s\n", buf);if (!strncasecmp (buf, QUIT_STR, strlen (QUIT_STR))) {	//用户输入了quit字符printf ("Client(fd=%d) is exiting!\n", newfd);break;}}close (newfd);}

下面是多进程代码

多进程

/*./client serv_ip serv_port */
#include "net.h"void usage (char *s)
{printf ("\n%s serv_ip serv_port", s);printf ("\n\t serv_ip: server ip address");printf ("\n\t serv_port: server port(>5000)\n\n");
}int main (int argc, char **argv)
{int fd = -1;int port = -1;struct sockaddr_in sin;if (argc != 3) {usage (argv[0]);exit (1);}/* 1. 创建socket fd */if ((fd = socket (AF_INET, SOCK_STREAM, 0)) < 0) {perror ("socket");exit (1);}port = atoi (argv[2]);if (port < 5000) {usage (argv[0]);exit (1);}/*2.连接服务器 *//*2.1 填充struct sockaddr_in结构体变量 */bzero (&sin, sizeof (sin));sin.sin_family = AF_INET;sin.sin_port = htons (port);	//网络字节序的端口号
#if 0sin.sin_addr.s_addr = inet_addr (SERV_IP_ADDR);
#elseif (inet_pton (AF_INET, argv[1], (void *) &sin.sin_addr) != 1) {perror ("inet_pton");exit (1);}
#endifif (connect (fd, (struct sockaddr *) &sin, sizeof (sin)) < 0) {perror ("connect");exit (1);}printf ("Client staring...OK!\n");/*3. 读写数据 */char buf[BUFSIZ];int ret = -1;while (1) {bzero (buf, BUFSIZ);if (fgets (buf, BUFSIZ - 1, stdin) == NULL) {continue;}do {ret = write (fd, buf, strlen (buf));} while (ret < 0 && EINTR == errno);if (!strncasecmp (buf, QUIT_STR, strlen (QUIT_STR))) {	//用户输入了quit字符printf ("Client is exiting!\n");break;}}/*4.关闭套接字 */close (fd);
}

客户端都一样就是服务器变了

server

#include <pthread.h>
#include <signal.h>
#include "net.h"void cli_data_handle (void *arg);void sig_child_handle(int signo)
{if(SIGCHLD == signo) {waitpid(-1, NULL,  WNOHANG);}
}
int main (void)
{int fd = -1;struct sockaddr_in sin;signal(SIGCHLD, sig_child_handle);	/* 1. 创建socket fd */if ((fd = socket (AF_INET, SOCK_STREAM, 0)) < 0) {perror ("socket");exit (1);}/*优化4： 允许绑定地址快速重用 */int b_reuse = 1;setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &b_reuse, sizeof (int));/*2. 绑定 *//*2.1 填充struct sockaddr_in结构体变量 */bzero (&sin, sizeof (sin));sin.sin_family = AF_INET;sin.sin_port = htons (SERV_PORT);	//网络字节序的端口号/*优化1: 让服务器程序能绑定在任意的IP上 */
#if 1sin.sin_addr.s_addr = htonl (INADDR_ANY);
#elseif (inet_pton (AF_INET, SERV_IP_ADDR, (void *) &sin.sin_addr) != 1) {perror ("inet_pton");exit (1);}
#endif/*2.2 绑定 */if (bind (fd, (struct sockaddr *) &sin, sizeof (sin)) < 0) {perror ("bind");exit (1);}/*3. 调用listen()把主动套接字变成被动套接字 */if (listen (fd, BACKLOG) < 0) {perror ("listen");exit (1);}printf ("Server starting....OK!\n");int newfd = -1;/*4. 阻塞等待客户端连接请求 */struct sockaddr_in cin;socklen_t addrlen = sizeof (cin);while(1) {pid_t pid = -1;if ((newfd = accept (fd, (struct sockaddr *) &cin, &addrlen)) < 0) {perror ("accept");break;}/*创建一个子进程用于处理已建立连接的客户的交互数据*/if((pid = fork()) < 0) {perror("fork");break;}if(0 == pid) {  //子进程中close(fd);char ipv4_addr[16];if (!inet_ntop (AF_INET, (void *) &cin.sin_addr, ipv4_addr, sizeof (cin))) {perror ("inet_ntop");exit (1);}printf ("Clinet(%s:%d) is connected!\n", ipv4_addr, ntohs(cin.sin_port));	cli_data_handle(&newfd);		return 0;	} else { //实际上此处 pid >0, 父进程中 close(newfd);}}		close (fd);return 0;
}void cli_data_handle (void *arg)
{int newfd = *(int *) arg;printf ("Child handling process: newfd =%d\n", newfd);//..和newfd进行数据读写int ret = -1;char buf[BUFSIZ];while (1) {bzero (buf, BUFSIZ);do {ret = read (newfd, buf, BUFSIZ - 1);} while (ret < 0 && EINTR == errno);if (ret < 0) {perror ("read");exit (1);}if (!ret) {				//对方已经关闭break;}printf ("Receive data: %s\n", buf);if (!strncasecmp (buf, QUIT_STR, strlen (QUIT_STR))) {	//用户输入了quit字符printf ("Client(fd=%d) is exiting!\n", newfd);break;}}close (newfd);}

这里是读

连接到指定的服务器并发送用户输入的字符串

client

#include "tcpnet.h"int main(int argc, char *argv[])
{int fd = -1;struct sockaddr_in sin;char buf[BUFSIZ];/*1.创建IPV4的TCP套接字 */fd = socket(AF_INET, SOCK_STREAM, 0);if(fd < 0) {perror("socket error!");exit(1);}/*2. 连接到服务器*//*2.1 填充服务器的IP地址和端口号*/bzero(&sin, sizeof(sin));sin.sin_family = AF_INET;sin.sin_port = htons(SERV_PORT);sin.sin_addr.s_addr = inet_addr(SERV_IPADDR);/*2.2 链接服务器*/if(connect(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {perror("connect");exit(1);}/* 从键盘获取数据发送给服务器*/while(1) {printf("Pls input string:\n");bzero(buf, BUFSIZ);if(fgets(buf, BUFSIZ-1, stdin) == NULL) continue;/*把buf中的数据写到网络套接字中*/	write(fd, buf, strlen(buf));if(!strncasecmp(buf, QUIT_STR, strlen(QUIT_STR))) { //用户输入了quit字符break;}}close(fd);return 0;
}

serve

#include <errno.h>#include "tcpnet.h"void *cli_data_handle(void *arg);
int main(void)
{int fd = -1, newfd;
//	int ret = -1;struct sockaddr_in sin;
//	char buf[BUFSIZ];/*1.创建IPV4的TCP套接字 */	fd = socket(AF_INET, SOCK_STREAM, 0);if(fd < 0) {perror("socket error!");exit(1);	}/* 允许本地的地址和端口快速重用 */int b_reuse = 1;setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &b_reuse, sizeof(int));/* 2.绑定在服务器的IP地址和端口号上*//* 2.1 填充struct sockaddr_in结构体*/bzero(&sin, sizeof(sin));sin.sin_family = AF_INET;sin.sin_port = htons(SERV_PORT);/*优化1：  接收从本机任意IP地址过来的发给TCP，SERV_PORT的数据*/sin.sin_addr.s_addr = htonl(INADDR_ANY);/* 2.2 绑定*/if(bind(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {perror("bind");exit(1);	}	/*3.把主动套接字变为被动套接字 */listen(fd, 5);printf("Server starting.....OK!\n");pthread_t tid; while(1) {struct cli_info *pcinfo= NULL;struct sockaddr_in cin;socklen_t clen = sizeof(cin);/*等待客户端连接*/do {newfd = accept(fd, (struct sockaddr *)&cin, &clen);}while(newfd < 0 && EINTR ==errno);if(newfd < 0) {perror("accept");exit(1);}/* 填充客户端信息*/pcinfo= (struct cli_info *)malloc(sizeof(struct cli_info));bzero(pcinfo, sizeof(struct cli_info));//填充内核链表//....FIXME!!!!pcinfo->cli_fd = newfd;memcpy(&pcinfo->cin, &cin, sizeof(cin));	//...填充其他数据//....FIXME!!!//把cinfo加入到user_info内核链表//...FIXME!!pthread_create(&tid, NULL, cli_data_handle, (void *)pcinfo);pthread_detach(tid);		}close(fd);return 0;
}void *cli_data_handle(void *arg)
{struct cli_info *pcinfo = (struct cli_info *)arg;char buf[BUFSIZ];char ipaddr[16];int ret = -1;/*设置线程的分离属性*/
//	pthread_detach(pthread_self());int newfd = pcinfo->cli_fd;struct sockaddr_in cin;memcpy(&cin ,&pcinfo->cin, sizeof(cin));bzero(ipaddr, 16);if(!inet_ntop(AF_INET, (void *)&cin.sin_addr, ipaddr, sizeof(cin))) {perror("inet_ntop");exit(1);}printf("Client(%s:%d) is conneted!\n", ipaddr,ntohs(cin.sin_port));/*5.和客户端进行信息的交互(读写) */while(1) {bzero(buf, BUFSIZ);do {ret =read(newfd, buf,BUFSIZ-1);}while(ret < 0 && EINTR == errno);if(ret < 0) {continue;}/* 处理数据*///....printf("Receive data: %s\n",buf);if(!ret || !strncasecmp(buf, QUIT_STR, strlen(QUIT_STR))) { //客户端发送了quit字符//...FIXME!!, 删除cli_info的所占内存break;}}close(newfd);return NULL;
}

最后也是读



清空然后读