Prepare a linkat request
# DESCRIPTION
The [io_uring_prep_linkat] function prepares a linkat request. The
submission queue entry *sqe* is setup to use the old directory file
descriptor pointed to by *olddirfd* and old path pointed to by *oldpath*
with the new directory file descriptor pointed to by *newdirfd* and the
new path pointed to by *newpath* and using the specified flags in
*flags*.
The [io_uring_prep_link] function prepares a link request. The
submission queue entry *sqe* is setup to use the old path pointed to by
*oldpath* and the new path pointed to by *newpath*, both relative to the
current working directory and using the specified flags in *flags*.
These functions prepare an async [linkat](https://man7.org/linux/man-pages/man2/linkat.2.html) or [link](https://man7.org/linux/man-pages/man2/link.2.html) request.
See those man pages for details.
# RETURN VALUE
None
# ERRORS
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* field.
# NOTES
As with 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].
# SEE ALSO
[io_uring_get_sqe], [io_uring_submit], [linkat](https://man7.org/linux/man-pages/man2/linkat.2.html),
[link](https://man7.org/linux/man-pages/man2/link.2.html)