UMAD_POLL(3)              OpenIB Programmer's Manual              UMAD_POLL(3)

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>

OpenIB                         October 23, 2007                   UMAD_POLL(3)