io_uring_submit - Man Page

submit requests to the submission queue

Synopsis

#include <liburing.h>

int io_uring_submit(struct io_uring *ring);

Description

The io_uring_submit(3) function submits the next events to the submission queue belonging to the ring.

After the caller retrieves a submission queue entry (SQE) with io_uring_get_sqe(3) and prepares the SQE using one of the provided helpers, it can be submitted with io_uring_submit(3).

Return Value

On success io_uring_submit(3) returns the number of submitted submission queue entries. On failure it returns -errno.

Notes

For any request that passes in data in a struct, that data must remain valid until the request has been successfully submitted. It need not remain valid until completion. Once a request has been submitted, the in-kernel state is stable. Very early kernels (5.4 and earlier) required state to be stable until the completion occurred. Applications can test for this behavior by inspecting the IORING_FEAT_SUBMIT_STABLE flag passed back from io_uring_queue_init_params(3). In general, the man pages for the individual prep helpers will have a note mentioning this fact as well, if required for the given command.

See Also

io_uring_get_sqe(3), io_uring_submit_and_wait(3), io_uring_submit_and_wait_timeout(3)

Referenced By

io_uring_cq_advance(3), io_uring_cqe_seen(3), io_uring_cq_ready(3), io_uring_get_sqe(3), io_uring_peek_cqe(3), io_uring_prep_accept(3), io_uring_prep_accept_direct(3), io_uring_prep_cancel(3), io_uring_prep_cancel64(3), io_uring_prep_close(3), io_uring_prep_close_direct(3), io_uring_prep_connect(3), io_uring_prep_fadvise(3), io_uring_prep_fallocate(3), io_uring_prep_files_update(3), io_uring_prep_fsync(3), io_uring_prep_link(3), io_uring_prep_linkat(3), io_uring_prep_madvise(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_openat(3), io_uring_prep_openat2(3), io_uring_prep_openat2_direct(3), io_uring_prep_openat_direct(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_readv(3), io_uring_prep_readv2(3), io_uring_prep_recv(3), io_uring_prep_recvmsg(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_sendmsg(3), io_uring_prep_shutdown(3), io_uring_prep_socket(3), io_uring_prep_socket_direct(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_write(3), io_uring_prep_writev(3), io_uring_prep_writev2(3), io_uring_sqe_set_flags(3), io_uring_sqring_wait(3), io_uring_submit(3), io_uring_submit_and_wait(3), io_uring_submit_and_wait_timeout(3), io_uring_wait_cqe(3), io_uring_wait_cqe_nr(3), io_uring_wait_cqes(3), io_uring_wait_cqe_timeout(3).

November 15, 2021 liburing-2.1 liburing Manual