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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | SEE ALSO | COLOPHON |
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io_uring_prep_close(3) liburing Manual io_uring_prep_close(3)
io_uring_prep_close - prepare a file descriptor close request
#include <liburing.h>
void io_uring_prep_close(struct io_uring_sqe *sqe,
int fd);
void io_uring_prep_close_direct(struct io_uring_sqe *sqe,
unsigned file_index);
The io_uring_prep_close(3) function prepares a close request. The
submission queue entry sqe is setup to close the file descriptor
indicated by fd.
For a direct descriptor close request, the offset is specified by
the file_index argument instead of the fd. This is identical to
unregistering the direct descriptor, and is provided as a
convenience. Note that even though it's closing a direct
descriptor, the application must not set IOSQE_FIXED_FILE on the
SQE. Otherwise the request will complete with -EBADF as the
result.
These functions prepare an async close(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. For closing
of a direct descriptor, the only failure cases are the kernel
running completely out of memory, or if the application has
specified an invalid direct descriptor. 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), close(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 [email protected]. This page
was obtained from the project's upstream Git repository
⟨https://github.com/axboe/liburing⟩ on 2025-02-02. (At that time,
the date of the most recent commit that was found in the
repository was 2025-01-22.) 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
[email protected]
liburing-2.2 March 13, 2022 io_uring_prep_close(3)
Pages that refer to this page: io_uring_prep_fixed_fd_install(3)
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HTML rendering created 2025-02-02 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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