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io_uring_get_sqe(3) — Linux manual page

io_uring_get_sqe(3)          liburing Manualio_uring_get_sqe(3)

NAME        top

       io_uring_get_sqe - get the next available submission queue entry       from the submission queue

SYNOPSIS        top

#include <liburing.h>struct io_uring_sqe *io_uring_get_sqe(struct io_uring *ring);

DESCRIPTION        top

       Theio_uring_get_sqe(3) function gets the next available       submission queue entry from the submission queue belonging to thering param.       On successio_uring_get_sqe(3) returns a pointer to the submission       queue entry. On failure NULL is returned.       If a submission queue entry is returned, it should be filled out       via one of the prep functions such asio_uring_prep_read(3) and       submitted viaio_uring_submit(3).       Note that neitherio_uring_get_sqenor the prep functions set (or       clear) theuser_datafield of the SQE. If the caller expectsio_uring_cqe_get_data(3) orio_uring_cqe_get_data64(3) to return       valid data when reaping IO completions, eitherio_uring_sqe_set_data(3) orio_uring_sqe_set_data64(3)MUSThave       been called before submitting the request.

RETURN VALUE        top

io_uring_get_sqe(3) returns a pointer to the next submission queue       event on success and NULL on failure. If NULL is returned, the SQ       ring is currently full and entries must be submitted for       processing before new ones can get allocated.

SEE ALSO        top

io_uring_submit(3),io_uring_sqe_set_data(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-0.7                  July 10, 2020io_uring_get_sqe(3)

Pages that refer to this page:io_uring_cqe_get_data(3), io_uring_cqe_get_data64(3), io_uring_get_events(3), io_uring_get_sqe(3), io_uring_prep_accept(3), io_uring_prep_accept_direct(3), io_uring_prep_bind(3), io_uring_prep_cancel(3), io_uring_prep_cancel64(3), io_uring_prep_cancel_fd(3), io_uring_prep_close(3), io_uring_prep_close_direct(3), io_uring_prep_cmd(3), io_uring_prep_cmd_discard(3), io_uring_prep_connect(3), io_uring_prep_epoll_wait(3), io_uring_prep_fadvise(3), io_uring_prep_fadvise64(3), io_uring_prep_fallocate(3), io_uring_prep_fgetxattr(3), io_uring_prep_files_update(3), io_uring_prep_fixed_fd_install(3), io_uring_prep_fsetxattr(3), io_uring_prep_fsync(3), io_uring_prep_ftruncate(3), io_uring_prep_futex_wait(3), io_uring_prep_futex_waitv(3), io_uring_prep_futex_wake(3), io_uring_prep_getxattr(3), io_uring_prep_link(3), io_uring_prep_linkat(3), io_uring_prep_link_timeout(3), io_uring_prep_listen(3), io_uring_prep_madvise(3), io_uring_prep_madvise64(3), io_uring_prep_mkdir(3), io_uring_prep_mkdirat(3), io_uring_prep_multishot_accept(3), io_uring_prep_multishot_accept_direct(3), io_uring_prep_nop(3), io_uring_prep_open(3), io_uring_prep_openat2(3), io_uring_prep_openat2_direct(3), io_uring_prep_openat(3), io_uring_prep_openat_direct(3), io_uring_prep_open_direct(3), io_uring_prep_pipe(3), io_uring_prep_poll_add(3), io_uring_prep_poll_multishot(3), io_uring_prep_poll_remove(3), io_uring_prep_poll_update(3), io_uring_prep_provide_buffers(3), io_uring_prep_read(3), io_uring_prep_read_multishot(3), io_uring_prep_readv2(3), io_uring_prep_readv(3), io_uring_prep_recv(3), io_uring_prep_recvmsg(3), io_uring_prep_recvmsg_multishot(3), io_uring_prep_recv_multishot(3), io_uring_prep_remove_buffers(3), io_uring_prep_rename(3), io_uring_prep_renameat(3), io_uring_prep_send(3), io_uring_prep_send_bundle(3), io_uring_prep_sendmsg(3), io_uring_prep_sendmsg_zc(3), io_uring_prep_send_set_addr(3), io_uring_prep_sendto(3), io_uring_prep_send_zc(3), io_uring_prep_send_zc_fixed(3), io_uring_prep_setxattr(3), io_uring_prep_shutdown(3), io_uring_prep_socket(3), io_uring_prep_socket_direct(3), io_uring_prep_socket_direct_alloc(3), io_uring_prep_splice(3), io_uring_prep_statx(3), io_uring_prep_symlink(3), io_uring_prep_symlinkat(3), io_uring_prep_sync_file_range(3), io_uring_prep_tee(3), io_uring_prep_timeout(3), io_uring_prep_timeout_remove(3), io_uring_prep_timeout_update(3), io_uring_prep_unlink(3), io_uring_prep_unlinkat(3), io_uring_prep_waitid(3), io_uring_prep_write(3), io_uring_prep_writev2(3), io_uring_prep_writev(3), io_uring_register_buffers(3), io_uring_register_buffers_sparse(3), io_uring_register_buffers_tags(3), io_uring_register_buffers_update_tag(3), io_uring_register_files(3), io_uring_register_files_sparse(3), io_uring_register_files_tags(3), io_uring_register_files_update(3), io_uring_register_files_update_tag(3), io_uring_sqe_set_buf_group(3), io_uring_sqe_set_data(3), io_uring_sqe_set_data64(3), io_uring_submit(3), io_uring_submit_and_wait(3), io_uring_submit_and_wait_min_timeout(3), io_uring_submit_and_wait_timeout(3)

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