這里練習用數據報套接字來通訊。

listener.c

// 數據報套接字服務器(listener.c)：在指定端口監聽，收到數據報后關閉連接#include <stdio.h> #include <stdlib.h> #include <errno.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/wait.h> #include <netinet/in.h>#define MYPORT 5000 #define MAXBUFLEN 100int main(int argc, char *argv[]) {int sock_fd;struct sockaddr_in my_addr;struct sockaddr_in their_addr;int addr_len, numbytes;char buf[MAXBUFLEN];if((sock_fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1){perror("socket");return 1;}my_addr.sin_family = AF_INET;my_addr.sin_port = htons(MYPORT);my_addr.sin_addr.s_addr = INADDR_ANY; // 自動設置為自己的IPbzero(&(my_addr.sin_zero), 8); // 將結構的其余空間清零if(bind(sock_fd, (struct sockaddr*)&my_addr, sizeof(struct sockaddr)) == -1){perror("bind");return 1;}addr_len = sizeof(struct sockaddr);if((numbytes = recvfrom(sock_fd, buf, MAXBUFLEN, 0, (struct sockaddr*)&their_addr, &addr_len)) == -1){perror("recvfrom");return 1;}close(sock_fd);printf("got packet from %s\n", inet_ntoa(their_addr.sin_addr));printf("packet is %d bytes long\n", numbytes);buf[numbytes] = 0;printf("packet contains [%s]\n", buf);return 0; }

talker.c

?

// 數據報套接字客戶端(talker.c)：向指定端口發送數據后關閉連接#include <stdio.h> #include <stdlib.h> #include <errno.h> #include <string.h> #include <netdb.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h>#define MYPORT 5000int main(int argc, char *argv[]) {int sock_fd, numbytes;struct sockaddr_in their_addr;struct hostent *he;if(argc < 3){fprintf(stderr, "Usage: %s <hostname> <message>\n", argv[0]);return 1;}if((he = gethostbyname(argv[1])) == NULL){herror("gethostbyname");return 1;}if((sock_fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1){perror("socket");return 1;}their_addr.sin_family = AF_INET;their_addr.sin_port = htons(MYPORT);their_addr.sin_addr = *((struct in_addr*)he->h_addr);bzero(&(their_addr.sin_zero), 8);if((numbytes = sendto(sock_fd, argv[2], strlen(argv[2]), 0, (struct sockaddr*)&their_addr, sizeof(struct sockaddr))) == -1){perror("sendto");return 1;}close(sock_fd);printf("sent %d bytes to %s\n", numbytes, inet_ntoa(their_addr.sin_addr));return 0; }

?

總結

以上是生活随笔為你收集整理的数据报套接字服务端和客户端的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。