Linux下面貌似没有什么直接开启或者关闭端口的命令，因为若仅仅只是开启了端口而不把它与进程相联系的话，端口的开启与关闭就显得毫无意义了（开了端口却没有程序处理进来的数据）。也就是说，Linux里面端口的活动与进程是紧密相连的，如果想要关闭某个端口，那么只要杀掉它对应的进程就可以了。 www.2cto.com 客户端代码

include <stdio.h>

include <stdlib.h>

include <strings.h>

include <arpa/inet.h>

include <sys/socket.h>

int main(){ int sockfd = socket(AF_INET,SOCK_STREAM,0); if(sockfd==-1)perror("sock"); struct sockaddr_in mine,dest;

bzero(&mine,sizeof(mine)); mine.sin_family = AF_INET; mine.sin_port = htons(3334); inet_pton(AF_INET,"192.168.1.100",&mine.sin_addr); bzero(&dest,sizeof(dest)); dest.sin_family = AF_INET; dest.sin_port = htons(9999); inet_pton(AF_INET,"192.168.1.100",&dest.sin_addr); int b = bind(sockfd,(struct sockaddr*)&mine,sizeof(mine)); if(b==-1)perror(""); int c = connect(sockfd,(struct sockaddr*)&dest,sizeof(dest)); if(c!=0)perror(""); close(sockfd);

}

服务端代码

include <stdio.h>

include <stdlib.h>

include <sys/socket.h>

include <arpa/inet.h>

include <strings.h>

int main(){ int sockfd = socket(AF_INET,SOCK_STREAM,0); struct sockaddr_in addr; bzero(&addr,sizeof(addr)); addr.sin_family = AF_INET; addr.sin_port = htons(9999); inet_pton(AF_INET,"192.168.1.100",&addr.sin_addr);

bind(sockfd,(struct sockaddr*)&addr,sizeof(addr)); listen(sockfd,5); while(1){ struct sockaddr_in c_addr; int c_len = sizeof(c_addr); bzero(&c_addr,c_len); int c = accept(sockfd,(struct sockaddr*)&addr,&c_len); if(c==-1)perror(""); char ip[40]={0}; int port; inet_ntop(AF_INET,&addr.sin_addr,ip,40); port = ntohs(addr.sin_port); printf("from %s:%d\n",ip,port); close(c); }

}

转载于:https://www.cnblogs.com/Dennis-mi/articles/6593007.html