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io_uring_prep_poll_multishot(3) — Linux manual page

io_uring_prep_poll_add(3)    liburing Manualio_uring_prep_poll_add(3)

NAME        top

       io_uring_prep_poll_add - prepare a poll request

SYNOPSIS        top

#include <poll.h>#include <liburing.h>void io_uring_prep_poll_add(struct io_uring_sqe *sqe,intfd,unsignedpoll_mask);void io_uring_prep_poll_multishot(struct io_uring_sqe *sqe,intfd,unsignedpoll_mask);

DESCRIPTION        top

       Theio_uring_prep_poll_add(3) function prepares a poll request.       The submission queue entrysqe is setup to use the file descriptorfd that should get polled, with the events desired specified in       thepoll_mask argument.       The default behavior is a single-shot poll request. When the       specified event has triggered, a completion CQE is posted and no       more events will be generated by the poll request.io_uring_prep_poll_multishot(3) behaves identically in terms of       events, but it persists across notifications and will repeatedly       post notifications for the same registration. A CQE posted from a       multishot poll request will haveIORING_CQE_F_MOREset in the CQEflags member, indicating that the application should expect more       completions from this request. If the multishot poll request gets       terminated or experiences an error, this flag will not be set in       the CQE. If this happens, the application should not expect       further CQEs from the original request and must reissue a new one       if it still wishes to get notifications on this file descriptor.

RETURN VALUE        top

       None

ERRORS        top

       The CQEres field will contain the result of the operation, which       is a bitmask of the events notified. See thepoll(2) man page for       details. Note that where synchronous system calls will return-1       on failure and seterrno to the actual error value, io_uring never       useserrno.  Instead it returns the negatederrno directly in the       CQEres field.

SEE ALSO        top

io_uring_get_sqe(3),io_uring_submit(3),poll(2),epoll_ctl(3)

COLOPHON        top

       This page is part of theliburing (A library for io_uring)       project.  Information about the project can be found at        ⟨https://github.com/axboe/liburing⟩.  If you have a bug report for       this manual page, send it to io-uring@vger.kernel.org.  This page       was obtained from the project's upstream Git repository       ⟨https://github.com/axboe/liburing⟩ on 2025-08-11.  (At that time,       the date of the most recent commit that was found in the       repository was 2025-08-02.)  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.orgliburing-2.2                  March 12, 2022io_uring_prep_poll_add(3)

Pages that refer to this page:io_uring_prep_poll_add(3), io_uring_prep_poll_multishot(3), io_uring_prep_poll_update(3)

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