io_uring_prep_fsync(3) — Linux manual page


io_uring_prep_fsync(3)       liburing Manual      io_uring_prep_fsync(3)

NAME         top

       io_uring_prep_fsync - prepare an fsync request

SYNOPSIS         top

       #include <liburing.h>

       void io_uring_prep_fsync(struct io_uring_sqe *sqe,
                                int fd,
                                unsigned flags);

DESCRIPTION         top

       The io_uring_prep_fsync(3) function prepares an fsync request.
       The submission queue entry sqe is setup to use the file
       descriptor fd that should get synced, with the modifier flags
       indicated by the flags argument.

       This function prepares an fsync request. It can act either like
       an fsync(2) operation, which is the default behavior. If
       IORING_FSYNC_DATASYNC is set in the flags argument, then it
       behaves like fdatasync(2).  If no range is specified, the fd will
       be synced from 0 to end-of-file.

       It's possible to specify a range to sync, if one is desired. If
       the off field of the SQE is set to non-zero, then that indicates
       the offset to start syncing at. If len is set in the SQE, then
       that indicates the size in bytes to sync from the offset. Note
       that these fields are not accepted by this helper, so they have
       to be set manually in the SQE after calling this prep helper.

RETURN VALUE         top


ERRORS         top

       The CQE res field will contain the result of the operation. See
       the related man page for details on possible values. Note that
       where synchronous system calls will return -1 on failure and set
       errno to the actual error value, io_uring never uses errno.
       Instead it returns the negated errno directly in the CQE res

SEE ALSO         top

       io_uring_get_sqe(3), io_uring_submit(3), fsync(2), fdatasync(2)

COLOPHON         top

       This page is part of the liburing (A library for io_uring)
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       was obtained from the project's upstream Git repository
       ⟨⟩ on 2023-12-22.  (At that
       time, the date of the most recent commit that was found in the
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liburing-2.2                 March 12, 2022       io_uring_prep_fsync(3)

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