#
/* udp_bread.c */

/* EMACS_MODES: c !fill */


/* User Datagram Protocol layer for the MIT network system.  The following
 * routines are included:
 *	udp_bread	Blocking read for udp packets
 */


#include	<udp.h>


udp_bread (fd, buf, len, timeout)

/* Blocking read for udp packets, with a timeout on the read.
 * Wait up to timeout seconds for a udp packet to arrive on
 * the specified udp connection, then read it into
 * the specified buffer.  If a packet is presently available the routine
 * will read it and  return immediately.  Returns the length of the 
 * received packet in bytes, or 0 if the timeout expires.
 *
 * Arguments:
 */

int	fd;				/* file descriptor for this conn */
caddr_t	buf;				/* buffer for received data */
int	len;				/* buffer size in bytes */
int	timeout;			/* time to wait before returning */
{
	if (in_wait (timeout))
		return (udp_read (fd, buf, len));
	else
		return (0);
}