debian man page for socket_broadcast

socket_broadcast(3)					     Library Functions Manual					       socket_broadcast(3)

NAME
       socket_broadcast - set UDP socket to broadcast mode

SYNTAX
       #include <socket.h>

       int socket_broadcast(int s);

DESCRIPTION
       socket_broadcast  sets  UDP  socket  s to broadcast mode.  socket_send4 and socket_send6 will fail to send packets to the broadcast address
       unless socket_broadcast is called before.

       Normally socket_broadcast returns 0.

       If anything goes wrong, socket_broadcast returns -1, setting errno appropriately.

EXAMPLE
	 #include <socket.h>

	 int s;

	 if ((s=socket_udp6())==-1)
	   strerr_die2sys(111,FATAL,"unable to create UDP socket: ");
	 if (socket_broadcast(s) == -1)
	   strerr_die2sys(111,FATAL,"unable to set broadcast mode: ");

SEE ALSO
       socket_send4(3), socket_send6(3)

															       socket_broadcast(3)