linux服务端和客户端
时间: 2023-04-28 07:01:43 浏览: 161
Linux服务端和客户端是指在Linux操作系统上运行的服务器和客户端程序。服务端程序提供服务,客户端程序请求服务。服务端和客户端之间通过网络进行通信,可以是本地网络,也可以是互联网。服务端和客户端可以是同一台机器,也可以是不同的机器。常见的Linux服务端包括Web服务器、邮件服务器、文件服务器等,常见的Linux客户端包括Web浏览器、邮件客户端、FTP客户端等。
相关问题
举例说明linux poll服务端和客户端代码
好的,下面是一个简单的使用poll实现的服务端和客户端代码:
服务端代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <poll.h>
#define MAX_CLIENTS 10
#define BUFFER_SIZE 1024
int main(int argc, char *argv[]) {
int server_fd, client_fds[MAX_CLIENTS], max_fd, activity, i, valread, sd;
struct sockaddr_in address;
char buffer[BUFFER_SIZE] = {0};
struct pollfd fds[MAX_CLIENTS + 1];
// 创建socket
if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
perror("socket failed");
exit(EXIT_FAILURE);
}
// 设置socket选项
int opt = 1;
if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
perror("setsockopt failed");
exit(EXIT_FAILURE);
}
// 绑定地址和端口
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons(8080);
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 failed");
exit(EXIT_FAILURE);
}
// 初始化pollfd数组
memset(fds, 0, sizeof(fds));
fds[0].fd = server_fd;
fds[0].events = POLLIN;
for (i = 1; i < MAX_CLIENTS + 1; i++) {
fds[i].fd = -1;
}
// 循环等待客户端连接
while (1) {
// 调用poll函数等待事件
activity = poll(fds, MAX_CLIENTS + 1, -1);
if (activity < 0) {
perror("poll failed");
exit(EXIT_FAILURE);
}
// 处理server_fd的事件
if (fds[0].revents & POLLIN) {
int new_socket;
if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
perror("accept failed");
exit(EXIT_FAILURE);
}
// 将新连接的socket加入到fds数组中
for (i = 1; i < MAX_CLIENTS + 1; i++) {
if (fds[i].fd == -1) {
fds[i].fd = new_socket;
fds[i].events = POLLIN;
break;
}
}
}
// 处理客户端socket的事件
for (i = 1; i < MAX_CLIENTS + 1; i++) {
sd = fds[i].fd;
if (sd > 0 && fds[i].revents & POLLIN) {
if ((valread = read(sd, buffer, BUFFER_SIZE)) == 0) {
// 客户端关闭连接
close(sd);
fds[i].fd = -1;
} else {
// 处理客户端发送的数据
buffer[valread] = '\0';
printf("Received message: %s\n", buffer);
send(sd, buffer, strlen(buffer), 0);
}
}
}
}
return 0;
}
```
客户端代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define BUFFER_SIZE 1024
int main(int argc, char *argv[]) {
int sock = 0, valread;
struct sockaddr_in serv_addr;
char buffer[BUFFER_SIZE] = {0};
// 创建socket
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
printf("\n Socket creation error \n");
return -1;
}
// 设置服务器地址和端口
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(8080);
if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0) {
printf("\nInvalid address/ Address not supported \n");
return -1;
}
// 连接服务器
if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
printf("\nConnection Failed \n");
return -1;
}
// 发送数据
char *hello = "Hello from client";
send(sock, hello, strlen(hello), 0);
printf("Hello message sent\n");
// 接收数据
valread = read(sock, buffer, BUFFER_SIZE);
printf("%s\n", buffer);
return 0;
}
```
linux建立服务端和客户端通信 c语言代码
以下是一个简单的 Linux C 语言代码示例,用于建立服务端和客户端之间的通信:
服务端代码:
```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 8080
int main() {
int server_fd, new_socket, valread;
struct sockaddr_in address;
int opt = 1;
int addrlen = sizeof(address);
char buffer[1024] = {0};
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 文件描述符到指定的 IP 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 文件描述符
if (listen(server_fd, 3) < 0) {
perror("listen");
exit(EXIT_FAILURE);
}
// 接受客户端连接
if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
perror("accept");
exit(EXIT_FAILURE);
}
// 从客户端读取数据
valread = read(new_socket, buffer, 1024);
printf("%s\n", buffer);
// 向客户端发送数据
send(new_socket, 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 <netinet/in.h>
#include <arpa/inet.h>
#define PORT 8080
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;
}
// 连接到服务端
if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
printf("\nConnection Failed \n");
return -1;
}
// 向服务端发送数据
send(sock, hello, strlen(hello), 0);
printf("Hello message sent\n");
// 从服务端读取数据
valread = read(sock, buffer, 1024);
printf("%s\n", buffer);
return 0;
}
```
这是一个简单的例子,用于建立服务端和客户端之间的通信。在实际应用中,您需要根据您的需求进行修改和扩展。