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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | NOTES | SEE ALSO | COLOPHON |
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io_uring_prep_tee(3) liburing Manual io_uring_prep_tee(3)
io_uring_prep_tee - prepare a tee request
#include <fcntl.h>
#include <liburing.h>
void io_uring_prep_tee(struct io_uring_sqe *sqe,
int fd_in,
int fd_out,
unsigned int nbytes,
unsigned int splice_flags);
The io_uring_prep_tee(3) function prepares a tee request. The
submission queue entry sqe is setup to use as input the file
descriptor fd_in and as output the file descriptor fd_out
duplicating up to nbytes bytes worth of data. splice_flags are
modifier flags for the operation. See tee(2) for the generic
splice flags.
If fd_out is a direct descriptor, IOSQE_FIXED_FILE can be set in
the SQE to indicate that. For the input file, the io_uring
specific SPLICE_F_FD_IN_FIXED can be set and fd_in given as a
registered file descriptor offset.
This function prepares an async tee(2) request. See that man page
for details.
None
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.
Despite accepting an unsigned number of bytes, this function can
transfer at most INT_MAX bytes per call (the maximum for the
underlying syscall interface). In practice, limits as low as
65536 have been observed (just like with tee(2) itself).
io_uring_get_sqe(3), io_uring_submit(3), io_uring_register(2),
splice(2), tee(2)
This page is part of the liburing (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 2026-05-24. (At that time,
the date of the most recent commit that was found in the
repository was 2026-05-18.) 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 is not part of the original manual page), send a mail to
man-pages@man7.org
liburing-2.2 March 13, 2022 io_uring_prep_tee(3)
Pages that refer to this page: io_uring_prep_tee(3)
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HTML rendering created 2026-05-30 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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