在編寫UDP廣播程序編寫完后，一編譯，提示socket bad address.后面查資料得知在讀取socket緩沖的時候,發送端sendto返回值正常，接收端recvfrom卻讀不到信息，是因為指針指向了無法訪問的空間。
發送端代碼：client.c

#include <sys/types.h> #include <sys/socket.h> #include <stdio.h> #include <unistd.h> #include <netinet/in.h> #include <arpa/inet.h> #include <string.h>int main(void){int ret;int serverfd;serverfd = socket(AF_INET, SOCK_DGRAM, 0);if(serverfd == -1){perror("socket fail\n");close(serverfd);return -1;}struct sockaddr_in serveraddr, clientaddr;memset(&serveraddr, 0, sizeof(serveraddr));memset(&clientaddr, 0, sizeof(clientaddr));serveraddr.sin_family = AF_INET;serveraddr.sin_port = htons(8000);serveraddr.sin_addr.s_addr = INADDR_ANY;ret = bind(serverfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr));if(ret == -1){perror("bind error\n");close(serverfd);return -1;}char buf[128];int sin_size = sizeof(clientaddr);while(1){memset(buf, 128, 0);recvfrom(serverfd, buf, 128, 0, (struct sockaddr *)&clientaddr, &sin_size);printf("Recv msg from client: %s\n", buf);}return 0; }

接收端代碼:server.c

#include <sys/types.h> #include <sys/socket.h> #include <stdio.h> #include <unistd.h> #include <string.h> #include <netinet/in.h> #include <arpa/inet.h>int main(void){int ret;int clientfd;clientfd = socket(AF_INET, SOCK_DGRAM, 0);if(clientfd == -1){perror("socket fail\n");close(clientfd);return -1;}struct sockaddr_in serveraddr;memset(&serveraddr, 0, sizeof(serveraddr));serveraddr.sin_family = AF_INET;serveraddr.sin_port = htons(8000);serveraddr.sin_addr.s_addr = inet_addr("192.168.5.255");int on = 1;ret = setsockopt(clientfd, SOL_SOCKET, SO_BROADCAST, (void *)&on, sizeof(on));//ret = setsockopt(clientfd, SOL_SOCKET, SO_BROADCAST, (void *)on, sizeof(on));//注意on與上一條語句的&on,少了一個取址符，//on的值此時為1（及地址值為1）,因此指向了無法訪問的空間if(ret == -1){perror("setsockopt fail\n");close(clientfd);return -1;}char buf[128];while(1){memset(buf, 0, 128);printf("Client send msg: ");fgets(buf, 128, stdin);sendto(clientfd, buf, strlen(buf), 0, (struct sockaddr *)&serveraddr, sizeof(serveraddr));}close(clientfd);return 0; }

為了突出重點（指針指向了無法訪問的空間），就省略了其它注釋了，見諒~

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