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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON |
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io_uring_r...r_zcrx_ctrl(3) liburing Manual io_uring_r...r_zcrx_ctrl(3)
io_uring_register_zcrx_ctrl - perform control operations on a
zero-copy receive context
#include <liburing.h>
int io_uring_register_zcrx_ctrl(struct io_uring *ring,
struct zcrx_ctrl *ctrl);
The io_uring_register_zcrx_ctrl(3) function performs control
operations on a previously registered zero-copy receive context.
See io_uring_register_ifq(3) for details on registering a zero-
copy receive context.
The ctrl argument must point to a struct zcrx_ctrl structure that
describes the control operation to perform:
struct zcrx_ctrl {
__u32 zcrx_id;
__u32 op;
__u64 __resv[2];
union {
struct zcrx_ctrl_export zc_export;
struct zcrx_ctrl_flush_rq zc_flush;
};
};
The zcrx_id field must be set to the ID of the zero-copy receive
context returned from io_uring_register_ifq(3). The op field
specifies the control operation to perform and can be one of:
ZCRX_CTRL_FLUSH_RQ
Flushes pending buffers from the refill queue. Uses the
zc_flush member of the union.
ZCRX_CTRL_EXPORT
Exports the zero-copy receive context for use by other
rings. Uses the zc_export member of the union. Upon
successful export, the zcrx_fd field in zc_export will
contain the file descriptor that can be used to share this
context with other io_uring instances.
The reserved __resv fields must be cleared to zero.
Returns 0 on success. On error, a negative errno value is
returned.
This function is available since Linux kernel 6.15.
io_uring_register(2), io_uring_register_ifq(3)
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 2026-08-04. (At that time,
the date of the most recent commit that was found in the
repository was 2026-07-28.) 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-2.15 March 26, 2026 io_uring_r...r_zcrx_ctrl(3)
Pages that refer to this page: io_uring_register_zcrx_ctrl(3)
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HTML rendering created 2026-09-09 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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