linux的UDP通讯方式
linux的UDP通讯demo ，chatgpt 生成的，记录下demo。
server.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>#define PORT 8000
#define MAXLINE 1024int main() {int sockfd;struct sockaddr_in servaddr, cliaddr;char buff[MAXLINE];int n;// Creating socket file descriptorif ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {perror("socket creation failed");exit(EXIT_FAILURE);}memset(&servaddr, 0, sizeof(servaddr));memset(&cliaddr, 0, sizeof(cliaddr));// Filling server informationservaddr.sin_family = AF_INET;servaddr.sin_addr.s_addr = INADDR_ANY;servaddr.sin_port = htons(PORT);// Binding the socket with the server addressif (bind(sockfd, (const struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) {perror("bind failed");exit(EXIT_FAILURE);}int len = sizeof(cliaddr);while (1) {n = recvfrom(sockfd, (char *)buff, MAXLINE, MSG_WAITALL, (struct sockaddr *)&cliaddr, &len);buff[n] = '\0';printf("Client : %s\n", buff);sendto(sockfd, (const char *)buff, strlen(buff), MSG_CONFIRM, (const struct sockaddr *)&cliaddr, len);printf("Server : %s\n", buff);}close(sockfd);return 0;
}
client.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>#define PORT 8000
#define MAXLINE 1024int main() {int sockfd;char buffer[MAXLINE];struct sockaddr_in servaddr;int len;// Creating socket file descriptorif ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {perror("socket creation failed");exit(EXIT_FAILURE);}memset(&servaddr, 0, sizeof(servaddr));// Filling server informationservaddr.sin_family = AF_INET;servaddr.sin_port = htons(PORT);servaddr.sin_addr.s_addr = INADDR_ANY;int n;while (1) {printf("Enter the message: ");memset(buffer, 0, sizeof(buffer));fgets(buffer, sizeof(buffer), stdin);sendto(sockfd, (const char *)buffer, strlen(buffer), MSG_CONFIRM, (const struct sockaddr *)&servaddr, sizeof(servaddr));printf("Message sent.\n");n = recvfrom(sockfd, (char *)buffer, MAXLINE, MSG_WAITALL, (struct sockaddr *)&servaddr, &len);buffer[n] = '\0';printf("Server : %s\n", buffer);}close(sockfd);return 0;
}