NAME
umad_poll - poll umad
SYNOPSIS
#include <infiniband/umad.h>
int umad_poll(int portid, int timeout_ms);
DESCRIPTION
umad_poll() waits up to timeout_ms milliseconds for a packet to be
received from the port specified by portid. Once a packet is ready to
be read, the function returns 0. After that the packet can be read
using umad_recv(). Otherwise, -ETIMEDOUT is returned. Note that
successfully polling a port does not guarantee that the subsequent
umad_recv() will be non blocking when several threads are using the
same port. Instead, use a timeout_ms parameter of zero to umad_recv()
to ensure a non-blocking read.
RETURN VALUE
umad_poll() returns 0 on success, and a negative value on error as
follows:
-EINVAL invalid port handle or agentid
-ETIMEDOUT poll operation timed out
-EIO poll operation failed
SEE ALSO
umad_recv(3)
AUTHOR
Hal Rosenstock <halr@voltaire.com>