由网友(我念你如初)分享简介：如何在 Linux 中使用 C 进行 UDP 广播?How to UDP Broadcast with C in Linux?推荐答案在很多IP栈中，比如Linux，这个代码是行不通的.您的套接字必须具有广播权限.试试这个:In many IP stack, such as Linux, this code d...

如何在 Linux 中使用 C 进行 UDP 广播?

How to UDP Broadcast with C in Linux?

推荐答案

在很多IP栈中，比如Linux，这个代码是行不通的.您的套接字必须具有广播权限.试试这个:

In many IP stack, such as Linux, this code does not work. Your socket must have broadcast permissions. Try this:

bcast_sock = socket(AF_INET, SOCK_DGRAM, 0);
int broadcastEnable=1;
int ret=setsockopt(bcast_sock, SOL_SOCKET, SO_BROADCAST, &broadcastEnable, sizeof(broadcastEnable));

/* Add other code, sockaddr, sendto() etc. */