网络编程9.4

1、多进程多线程并发服务器，再实现一遍（重点模型）。

多进程并发服务器：

#include <myhead.h>
#define SERPORT 9999
#define SERIP "192.168.0.162"
#define BACKLOG 10
void hande(int sss)
{if(sss==SIGCHLD){while(waitpid(-1,NULL,WNOHANG)!=-1);}
}
int main(int argc, const char *argv[])
{if(signal(SIGCHLD,hande)==SIG_ERR){perror("signal");return -1;}int oldfd = socket(AF_INET,SOCK_STREAM,0);if(oldfd==-1){perror("socket");return -1;}int kkk = 666;if(setsockopt(oldfd,SOL_SOCKET,SO_REUSEADDR,&kkk,sizeof(kkk))==-1){perror("setsockopt");return -1;}struct sockaddr_in sin = {.sin_family = AF_INET,.sin_port = htons(SERPORT),.sin_addr.s_addr = inet_addr(SERIP)};if(bind(oldfd,(struct sockaddr *)&sin,sizeof(sin))==-1){perror("bind");return -1;}if(listen(oldfd,BACKLOG)==-1){perror("listen");return -1;}struct sockaddr_in cin;int cinlen = sizeof(cin);while(1){int newfd = accept(oldfd,(struct sockaddr *)&cin,&cinlen);if(newfd==-1){perror("accept");return -1;}printf("%s:%d:连接成功\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port));pid_t pid = fork();if(pid>0){close(newfd);}else if(pid==0){close(oldfd);char buf[1024];while(1){int len = recv(newfd,buf,sizeof(buf),0);if(len==0){printf("客户端退出\n");break;}printf("服务器收到消息：%s\n",buf);strcat(buf,"^_^");putchar(10);send(newfd,buf,sizeof(buf),0);printf("发送成功\n");}close(newfd);exit(0);//退出子进程}else{perror("fork");return -1;}}close(oldfd);return 0;
}

多线程并发服务器：

#include <myhead.h>
#define SERPORT 8888
#define SERIP "192.168.0.162"
#define BACKLOG 20typedef struct
{int newfd;struct sockaddr_in cin;
}LA;void *fun1(void *ddd)
{int newfd = ((LA *)ddd)->newfd;struct sockaddr_in cin = ((LA *)ddd)->cin;char buf[1024];while(1){bzero(buf,sizeof(buf));int len = recv(newfd,buf,sizeof(buf),0);printf("收到%s:%d的信息：%s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),buf);if(len==0){printf("客户端退出\n");break;}strcat(buf,"JTT1314");send(newfd,buf,sizeof(buf),0);printf("发送成功\n");}pthread_exit(NULL);
}
int main(int argc, const char *argv[])
{int oldfd = socket(AF_INET,SOCK_STREAM,0);if(oldfd==-1){perror("socket");return -1;}int BMWm = 4;if(setsockopt(oldfd,SOL_SOCKET,SO_REUSEADDR,&BMWm,sizeof(BMWm))==-1){perror("setsockopt");return -1;}printf("端口号快速复用成功\n");struct sockaddr_in sin = {.sin_family = AF_INET,.sin_port = htons(SERPORT),.sin_addr.s_addr = inet_addr(SERIP)};if(bind(oldfd,(struct sockaddr *)&sin,sizeof(sin))==-1){perror("bind");return -1;}if(listen(oldfd,BACKLOG)==-1){perror("listen");return -1;}printf("监听成功\n");struct sockaddr_in cin;int cinlen = sizeof(cin);LA MSG;while(1){int newfd = accept(oldfd,(struct sockaddr *)&cin,&cinlen);if(newfd==-1){perror("accept");return -1;}printf("%s:%d发来请求\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port));MSG.newfd = newfd;MSG.cin = cin;pthread_t tid;if(pthread_create(&tid,NULL,fun1,&MSG)!=0){perror("pthread_create");return -1;}pthread_detach(tid);}close(oldfd);return 0;
}

2、广播发送接收端，自己实现一遍（重点模型）

发送端:

#include <myhead.h>
#define SENDPORT 6666
#define SENDIP "192.168.0.255"
int main(int argc, const char *argv[])
{int oldfd = socket(AF_INET,SOCK_DGRAM,0);if(oldfd==-1){perror("socket");return -1;}int kkk = 2;if(setsockopt(oldfd,SOL_SOCKET,SO_BROADCAST,&kkk,sizeof(kkk))==-1){perror("setsockopt");return -1;}printf("设置允许广播成功\n");struct sockaddr_in send = {.sin_family = AF_INET,.sin_port = htons(SENDPORT),.sin_addr.s_addr = inet_addr(SENDIP)};struct sockaddr_in ree;int reelen = sizeof(ree);char buf[1024];while(1){bzero(buf,sizeof(buf));sleep(2);strcat(buf,"5201314");sendto(oldfd,buf,sizeof(buf),0,(struct sockaddr *)&send,sizeof(send));printf("发送成功\n");}close(oldfd);return 0;
}

接收端：

#include <myhead.h>
#define SENDPORT 6666
#define SENDIP "192.168.0.255"
int main(int argc, const char *argv[])
{int oldfd = socket(AF_INET,SOCK_DGRAM,0);if(oldfd==-1){perror("socket");return -1;}struct sockaddr_in ree = {.sin_family = AF_INET,.sin_port = htons(SENDPORT),.sin_addr.s_addr = inet_addr(SENDIP)};if(bind(oldfd,(struct sockaddr *)&ree,sizeof(ree))==-1){perror("bind");return -1;}char buf[1024];while(1){bzero(buf,sizeof(buf));recvfrom(oldfd,buf,sizeof(buf),0,NULL,NULL);printf("%s\n",buf);strcat(buf,"^-^");sendto(oldfd,buf,sizeof(buf),0,(struct sockaddr *)&ree,sizeof(ree));printf("发送成功\n");}return 0;
}