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NAME | SYNOPSIS | DESCRIPTION | NOTES | RETURN VALUE | SEE ALSO | COLOPHON |
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io_uring_b...g_available(3) liburing Manual io_uring_b...g_available(3)
io_uring_buf_ring_available - return number of unconsumed provided
ring buffer entries
#include <liburing.h>
int io_uring_buf_ring_available(struct io_uring *ring,
struct io_uring_buf_ring *br,
unsigned short bgid);
The io_uring_buf_ring_available(3) helper returns the number of
unconsumed (by the kernel) entries in the br provided buffer group
belonging to the io_uring ring and identified by the buffer group
ID bgid.
Since the head of the provided buffer ring is only visible to the
kernel, it's impossible to otherwise know how many unconsumed
entries exist in the given provided buffer ring. This function
query the kernel to return that number. Available since kernel
6.8.
The returned number of entries reflect the amount of unconsumed
entries at the time that it was queried. If inflight IO exists
that may consume provided buffers from this buffer group, then the
returned value is inherently racy.
Returns the number of unconsumed entries on success, which may be
0. In case of error, may return -ENOENT if the specified buffer
group doesn't exist, or -EINVAL if the buffer group isn't of the
correct type, or if the kernel doesn't support this feature.
io_uring_register_buf_ring(3), io_uring_buf_ring_add(3),
io_uring_buf_ring_cq_advance(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 2025-08-11. (At that time,
the date of the most recent commit that was found in the
repository was 2025-08-02.) 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-2.6 Jan 11, 2024 io_uring_b...g_available(3)
Pages that refer to this page: io_uring_buf_ring_available(3)
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HTML rendering created 2025-09-06 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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