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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | SEE ALSO | COLOPHON |
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io_uring_prep_send_zc(3) liburing Manual io_uring_prep_send_zc(3)
io_uring_prep_send_zc - prepare a zerocopy send request
#include <liburing.h>
void io_uring_prep_send_zc(struct io_uring_sqe *sqe,
int sockfd,
const void *buf,
size_t len,
int flags,
unsigned zc_flags);
void io_uring_prep_send_zc_fixed(struct io_uring_sqe *sqe,
int sockfd,
const void *buf,
size_t len,
int flags,
unsigned zc_flags);
unsigned buf_index);
The io_uring_prep_send_zc(3) function prepares a zerocopy send
request. The submission queue entry sqe is setup to use the file
descriptor sockfd to start sending the data from buf of size len
bytes with send modifier flags flags and zerocopy modifier flags
zc_flags.
The io_uring_prep_send_zc_fixed(3) works just like
io_uring_prep_send_zc(3) except it requires the use of buffers
that have been registered with io_uring_register_buffers(3). The
buf and len arguments must fall within a region specified by
buf_index in the previously registered buffer. The buffer need
not be aligned with the start of the registered buffer.
Note that using IOSQE_IO_LINK with this request type requires the
setting of MSG_WAITALL in the flags argument, as a short send
isn't considered an error condition without that being set.
These functions prepare an async zerocopy send(2) request. See
that man page for details. For details on the zerocopy nature of
it, see io_uring_enter(2).
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.
io_uring_get_sqe(3), io_uring_submit(3), io_uring_prep_send(3),
io_uring_enter(2), send(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 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-06-03.) 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-2.3 September 6, 2022 io_uring_prep_send_zc(3)
Pages that refer to this page: io_uring_prep_send_zc(3), io_uring_prep_send_zc_fixed(3)
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HTML rendering created 2024-06-26 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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