linuxsocket编程
时间: 2023-06-05 19:47:53 浏览: 111
Linux Socket编程是一种在Linux操作系统上进行网络编程的技术。它允许程序员使用Socket API来创建和管理网络连接,包括TCP、UDP和其他协议。通过Socket编程,程序员可以实现各种网络应用程序,如Web服务器、邮件客户端、聊天应用程序等。Socket编程需要程序员具备一定的网络编程知识和Linux操作系统的基础知识。
相关问题
linux socket编程代码
当然,我可以给你一个简单的 Linux Socket 编程的示例代码。以下是一个基于 TCP 协议的客户端和服务器端的示例:
客户端代码(client.c):
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#define SERVER_IP "127.0.0.1"
#define SERVER_PORT 12345
int main() {
int sockfd;
struct sockaddr_in server_addr;
char buffer[1024];
// 创建套接字
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) {
perror("Socket creation failed");
exit(EXIT_FAILURE);
}
memset(&server_addr, 0, sizeof(server_addr));
// 设置服务器地址
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(SERVER_PORT);
if (inet_pton(AF_INET, SERVER_IP, &(server_addr.sin_addr)) <= 0) {
perror("Invalid address/ Address not supported");
exit(EXIT_FAILURE);
}
// 连接到服务器
if (connect(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
perror("Connection failed");
exit(EXIT_FAILURE);
}
printf("Connected to the server.\n");
// 发送消息给服务器
strcpy(buffer, "Hello, server!");
if (write(sockfd, buffer, strlen(buffer)) < 0) {
perror("Write failed");
exit(EXIT_FAILURE);
}
printf("Message sent to the server: %s\n", buffer);
// 从服务器接收响应
memset(buffer, 0, sizeof(buffer));
if (read(sockfd, buffer, sizeof(buffer)) < 0) {
perror("Read failed");
exit(EXIT_FAILURE);
}
printf("Response from the server: %s\n", buffer);
// 关闭套接字
close(sockfd);
return 0;
}
```
服务器端代码(server.c):
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#define SERVER_PORT 12345
int main() {
int sockfd, new_sockfd;
struct sockaddr_in server_addr, client_addr;
socklen_t client_addr_len;
char buffer[1024];
// 创建套接字
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) {
perror("Socket creation failed");
exit(EXIT_FAILURE);
}
memset(&server_addr, 0, sizeof(server_addr));
// 设置服务器地址
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(SERVER_PORT);
// 绑定套接字到指定的 IP 地址和端口号
if (bind(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
perror("Binding failed");
exit(EXIT_FAILURE);
}
// 监听连接请求
if (listen(sockfd, 5) < 0) {
perror("Listening failed");
exit(EXIT_FAILURE);
}
printf("Server listening on port %d.\n", SERVER_PORT);
while (1) {
// 接收客户端连接
client_addr_len = sizeof(client_addr);
new_sockfd = accept(sockfd, (struct sockaddr*)&client_addr, &client_addr_len);
if (new_sockfd < 0) {
perror("Accepting failed");
exit(EXIT_FAILURE);
}
printf("Client connected.\n");
// 接收客户端发送的消息
memset(buffer, 0, sizeof(buffer));
if (read(new_sockfd, buffer, sizeof(buffer)) < 0) {
perror("Read failed");
exit(EXIT_FAILURE);
}
printf("Message from the client: %s\n", buffer);
// 发送响应给客户端
strcpy(buffer, "Hello, client!");
if (write(new_sockfd, buffer, strlen(buffer)) < 0) {
perror("Write failed");
exit(EXIT_FAILURE);
}
printf("Response sent to the client: %s\n", buffer);
// 关闭新套接字
close(new_sockfd);
printf("Client disconnected.\n");
}
// 关闭套接字
close(sockfd);
return 0;
}
```
请注意,这只是一个简单的示例代码,可能还需要进行错误处理和其他相关的细节处理。这个示例展示了一个最基本的 TCP 客户端和服务器端之间的通信过程。你可以根据你的需求进行修改和扩展。希望能对你有所帮助!
Linux socket 编程实例
以下是一个简单的 Linux socket 编程实例,展示了如何实现一个简单的客户端和服务器程序:
服务器端代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#define PORT 8888
int main() {
int server_fd, client_fd, valread;
struct sockaddr_in address;
int opt = 1;
int addrlen = sizeof(address);
char buffer[1024] = {0};
const char *hello = "Hello from server";
// 创建 socket 文件描述符
if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
perror("socket failed");
exit(EXIT_FAILURE);
}
// 设置 socket 选项
if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
perror("setsockopt");
exit(EXIT_FAILURE);
}
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons(PORT);
// 绑定 socket 到指定地址和端口号
if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
perror("bind failed");
exit(EXIT_FAILURE);
}
// 监听 socket
if (listen(server_fd, 3) < 0) {
perror("listen");
exit(EXIT_FAILURE);
}
// 接受客户端连接
if ((client_fd = accept(server_fd, (struct sockaddr *)&address, (socklen_t *)&addrlen)) < 0) {
perror("accept");
exit(EXIT_FAILURE);
}
// 从客户端接收数据
valread = read(client_fd, buffer, 1024);
printf("%s\n", buffer);
// 向客户端发送数据
send(client_fd, hello, strlen(hello), 0);
printf("Hello message sent\n");
return 0;
}
```
客户端代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#define PORT 8888
int main(int argc, char const *argv[]) {
int sock = 0, valread;
struct sockaddr_in serv_addr;
char *hello = "Hello from client";
char buffer[1024] = {0};
// 创建 socket 文件描述符
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
printf("\n Socket creation error \n");
return -1;
}
memset(&serv_addr, '0', sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(PORT);
// 将 IPv4 地址从点分十进制转换为二进制格式
if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0) {
printf("\nInvalid address/ Address not supported \n");
return -1;
}
// 连接到服务器
if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
printf("\nConnection Failed \n");
return -1;
}
// 向服务器发送数据
send(sock, hello, strlen(hello), 0);
printf("Hello message sent\n");
// 从服务器接收数据
valread = read(sock, buffer, 1024);
printf("%s\n", buffer);
return 0;
}
```
以上代码实现了一个简单的客户端和服务器程序,客户端向服务器发送 "Hello from client" 字符串,服务器接收到后向客户端发送 "Hello from server" 字符串。
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