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umad_poll(3) — Linux manual page

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

NAME        top

       umad_poll - poll umad

SYNOPSIS        top

#include <infiniband/umad.h>int umad_poll(intportid, inttimeout_ms);

DESCRIPTION        top

umad_poll()waits up totimeout_ms milliseconds for a packet to be       received from the port specified byportid.  Once a packet is       ready to be read, the function returns 0. After that the packet       can be read usingumad_recv().Otherwise, -ETIMEDOUT is returned.       Note that successfully polling a port does not guarantee that the       subsequentumad_recv()will be non blocking when several threads       are using the same port. Instead, use atimeout_ms parameter of       zero toumad_recv()to ensure a non-blocking read.

RETURN VALUE        top

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        top

umad_recv(3)

AUTHOR        top

       Hal Rosenstock <halr@voltaire.com>

COLOPHON        top

       This page is part of therdma-core (RDMA Core Userspace Libraries       and Daemons) project.  Information about the project can be found       at ⟨https://github.com/linux-rdma/rdma-core⟩.  If you have a bug       report for this manual page, send it to       linux-rdma@vger.kernel.org.  This page was obtained from the       project's upstream Git repository       ⟨https://github.com/linux-rdma/rdma-core.git⟩ on 2025-08-11.  (At       that time, the date of the most recent commit that was found in       the repository was 2025-08-04.)  If you discover any rendering       problems in this HTML version of the page, or you believe there is       a better or more up-to-date source for the page, or you have       corrections or improvements to the information in this COLOPHON       (which isnot part of the original manual page), send a mail to       man-pages@man7.orgOpenIB                       October 23, 2007UMAD_POLL(3)

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