网站分页符素材,企业网站建设方案如何写,长江商学院 网站建设,电商网站开发模板实验目标:
1 实现基于流的unix域套接字通信cs模型
2 实现基于数据报的unix域套接字通信cs模型
3 可以观察到CS两端的完整启动退出流程,为了实现这一目标仅进行一次通信
实验心得:
1 使用unlink避免地址冲突 清理资源
2 传统udp在首次sendto时系统临时分配端口,在套接字关…实验目标:
1 实现基于流的unix域套接字通信cs模型
2 实现基于数据报的unix域套接字通信cs模型
3 可以观察到CS两端的完整启动退出流程,为了实现这一目标仅进行一次通信
实验心得:
1 使用unlink避免地址冲突 清理资源
2 传统udp在首次sendto时系统临时分配端口,在套接字关闭|程序终止|显式解绑时端口生命周期结束,而unix域套接字则需要手动绑定,否则客户端无法收到服务器的回信
3 复制文件路径时,sun_path的长度无法更改,容易出现越界的情况
基于流:
#define _GNU_SOURCE
#include stdio.h
#include sys/socket.h
#include sys/un.h
#include netinet/in.h
#include sys/epoll.h
#include string.h
#include unistd.h#define SOCK_PATH /home/u22/socket/addr1
// 服务端
int main()
{int server_sockfd, client_sockfd;struct sockaddr_un server_sockaddr, client_sockaddr;memset(server_sockaddr, 0, sizeof(server_sockaddr));memset(client_sockaddr, 0, sizeof(client_sockaddr));socklen_t client_sockaddr_len sizeof(client_sockaddr);ssize_t send_bytes, recv_bytes;char send_buf[1024] server say : How can I help you today ?;char recv_buf[1024] {0};// unix域套接字 使用流式传输,不能叫TCPserver_sockfd socket(AF_UNIX, SOCK_STREAM, 0);if (server_sockfd -1){perror(socket);}server_sockaddr.sun_family AF_UNIX;strcpy(server_sockaddr.sun_path, SOCK_PATH);// 为什么要删除这个文件?因为再次启动代码将无法访问这个文件unlink(SOCK_PATH);if ((bind(server_sockfd, (struct sockaddr *)server_sockaddr, sizeof(server_sockaddr))) -1){perror(bind);}if (listen(server_sockfd, 16) -1){perror(listen);}printf(waiting for connect...\n);// accept返回后将收到客户端地址信息client_sockfd accept(server_sockfd, (struct sockaddr *)client_sockaddr, client_sockaddr_len);if (client_sockfd -1){perror(accept);}// 同tcp一样 recv send使用accept返回的socket通信recv_bytes recv(client_sockfd, recv_buf, sizeof(recv_buf), 0);if (recv_bytes -1){perror(recv);}if (recv_bytes 0){printf(%s\n, recv_buf);}send_bytes send(client_sockfd, send_buf, strlen(send_buf), 0);if (send_bytes -1){perror(send);}if (send_bytes 0){printf(%s\n, send_buf);}close(client_sockfd);close(server_sockfd);printf(server close\n);//用完了 还要删一遍unlink(SOCK_PATH);return 0;
}#define _GNU_SOURCE
#include stdio.h
#include sys/socket.h
#include sys/un.h
#include netinet/in.h
#include sys/epoll.h
#include string.h
#include unistd.h#define SOCK_PATH /home/u22/socket/addr1
//客户端
int main()
{int client_sockfd;struct sockaddr_un server_sockaddr;memset(server_sockaddr, 0, sizeof(server_sockaddr));ssize_t send_bytes, recv_bytes;char send_buf[1024] client say : hello server !;char recv_buf[1024] {0};//创建基于流的unix域套接字client_sockfd socket(AF_UNIX, SOCK_STREAM, 0);if (client_sockfd -1){perror(socket);}server_sockaddr.sun_family AF_UNIX;strcpy(server_sockaddr.sun_path, SOCK_PATH);//尝试连接serverprintf(connect server...\n);if ((connect(client_sockfd, (struct sockaddr *)server_sockaddr, sizeof(server_sockaddr))) -1){perror(connect);}//与TCP一样 使用socket()返回的socket通信send_bytes send(client_sockfd, send_buf, strlen(send_buf), 0);if (send_bytes -1){perror(send);}printf(%s\n, send_buf);recv_bytes recv(client_sockfd, recv_buf, sizeof(recv_buf), 0);if (recv_bytes -1){perror(recv);}printf(%s\n, recv_buf);close(client_sockfd);printf(client close\n);return 0;
}基于数据报:
#define _GNU_SOURCE
#include stdio.h
#include sys/socket.h
#include sys/un.h
#include netinet/in.h
#include sys/epoll.h
#include string.h
#include unistd.h#define SOCK_PATH /home/u22/socket/addr2int main()
{int server_sockfd;struct sockaddr_un server_sockaddr, client_sockaddr;memset(server_sockaddr, 0, sizeof(server_sockaddr));memset(client_sockaddr, 0, sizeof(client_sockaddr));socklen_t client_sockaddr_len sizeof(client_sockaddr);ssize_t send_bytes, recv_bytes;char send_buf[1024] server say : How can I help you today ?;char recv_buf[1024] {0};// unix域套接字 使用数据报传输,不能叫UDPserver_sockfd socket(AF_UNIX, SOCK_DGRAM, 0);if (server_sockfd -1){perror(socket);}// 无法再次访问此文件,必须删除unlink(SOCK_PATH);server_sockaddr.sun_family AF_UNIX;// 容易越界,本系统为108字节strncpy(server_sockaddr.sun_path, SOCK_PATH, sizeof(server_sockaddr.sun_path));// 不bind,peer使用sendto也可以正常发送,但是本endpoint无法接收if ((bind(server_sockfd, (struct sockaddr *)server_sockaddr, sizeof(server_sockaddr))) -1){perror(bind);}printf(waiting for recv...\n);// 接收的客户端地址信息存在client_sockaddr中,供sendto使用recv_bytes recvfrom(server_sockfd, recv_buf, sizeof(recv_buf),0, (struct sockaddr *)client_sockaddr, client_sockaddr_len);if (recv_bytes -1){perror(recv);}if (recv_bytes 0){printf(%s\n, recv_buf);}send_bytes sendto(server_sockfd, send_buf, strlen(send_buf),0, (struct sockaddr *)client_sockaddr, client_sockaddr_len);if (send_bytes -1){perror(send);}if (send_bytes 0){printf(%s\n, send_buf);}close(server_sockfd);printf(server close\n);// 用完删除SOCK_PATH这个文件unlink(SOCK_PATH);return 0;
}#define _GNU_SOURCE
#include stdio.h
#include sys/socket.h
#include sys/un.h
#include netinet/in.h
#include sys/epoll.h
#include string.h
#include unistd.h
// 客户端使用的socket文件
#define SOCK_PATH_C /home/u22/socket/addr3
// 服务器使用的socket文件
#define SOCK_PATH_S /home/u22/socket/addr2
// 客户端
int main()
{int client_sockfd;struct sockaddr_un server_sockaddr, client_sockaddr;memset(server_sockaddr, 0, sizeof(server_sockaddr));memset(client_sockaddr, 0, sizeof(client_sockaddr));socklen_t server_sockaddr_len sizeof(server_sockaddr);ssize_t send_bytes, recv_bytes;char send_buf[1024] client say : hello server !;char recv_buf[1024] {0};// 基于数据报的unix域套接字client_sockfd socket(AF_UNIX, SOCK_DGRAM, 0);if (client_sockfd -1){perror(socket);}// 必须删除,否则下次不让用unlink(SOCK_PATH_C);client_sockaddr.sun_family AF_UNIX;// 容易越界,本系统为108strncpy(client_sockaddr.sun_path, SOCK_PATH_C, sizeof(client_sockaddr.sun_path));// 传统udp在首次sendto时系统临时分配端口,在套接字关闭|程序终止|显式解绑时端口生命周期结束// 而unix域套接字则需要手动绑定if ((bind(client_sockfd, (struct sockaddr *)client_sockaddr, sizeof(client_sockaddr))) -1){perror(bind);}server_sockaddr.sun_family AF_UNIX;// 容易越界,本系统为108strncpy(server_sockaddr.sun_path, SOCK_PATH_S, sizeof(server_sockaddr.sun_path));printf(send message\n);// 向服务器发送信息,由server_sockaddr指定地址send_bytes sendto(client_sockfd, send_buf, strlen(send_buf),0, (struct sockaddr *)server_sockaddr, server_sockaddr_len);if (send_bytes -1){perror(send);}if (send_bytes 0){printf(%s\n, send_buf);}// 两个null是服务器的地址信息和长度,不需要则设为nullrecv_bytes recvfrom(client_sockfd, recv_buf, sizeof(recv_buf),0, NULL, NULL);if (recv_bytes -1){perror(recv);}if (recv_bytes 0){printf(%s\n, recv_buf);}close(client_sockfd);printf(client close\n);// 用完必须删除文件unlink(SOCK_PATH_C);return 0;
}
