bionic (3) umad_poll.3.gz

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>