http://blog.csdn.net/guanghua2_0beta/article/details/52483916
sendto() 向广播地址发包返回errno 13, Permission denied错误
sendto()向广播地址发包返回errno 13, Permission denied错误
原因:
没有设置socket的SO_BROADCAST属性。特别注意:SO_BROADCAST属性要单独设置,一般习惯setsockopt时同时设置多个属性,例如SO_BROADCAST|SO_REUSEADDR,虽然大部分情况下工作正常,但工作中还是遇到了同时设置不起作用的问题;
int ret; int optval = 1; ret = setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &optval,sizeof(int)); if(ret!=0) { printf("setsockopt SO_BROADCAST error:%d, %s\n", errno, strerror(errno)); close(sockfd); return -1; } ret = setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &optval,sizeof(int)); if(ret!=0) { close(sockfd); return -1; }
时间: 2024-10-12 15:31:44