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man/io_uring_prep_fadvise.3
76 строк
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Jens Axboe
man/io_uring_prep_fadvise.3: fix io_uring_prep_fadvise64() prototype
16 дек 2024, 17:02
16 дек 2024, 17:02
90f33d7
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.\" Copyright (C) 2022 Jens Axboe <axboe@kernel.dk> .\" .\" SPDX-License-Identifier: LGPL-2.0-or-later .\" .TH io_uring_prep_fadvise 3 "March 13, 2022" "liburing-2.2" "liburing Manual" .SH NAME io_uring_prep_fadvise \- prepare a fadvise request .SH SYNOPSIS .nf .B #include <fcntl.h> .B #include <liburing.h> .PP .BI "void io_uring_prep_fadvise(struct io_uring_sqe *" sqe "," .BI " int " fd "," .BI " __u64 " offset "," .BI " __u32 " len "," .BI " int " advice ");" .BI " .BI "void io_uring_prep_fadvise64(struct io_uring_sqe *" sqe "," .BI " int " fd "," .BI " __u64 " offset "," .BI " off_t " len "," .BI " int " advice ");" .fi .SH DESCRIPTION .PP The .BR io_uring_prep_fadvise (3) function prepares an fadvise request. The submission queue entry .I sqe is setup to use the file descriptor pointed to by .I fd to start an fadvise operation at .I offset and of .I len length in bytes, giving it the advise located in .IR advice . The .BR io_uring_prep_fadvise64 (3) function works like .BR io_uring_prep_fadvise (3) except that it takes a 64-bit length rather than just a 32-bit one. Older kernels may not support the 64-bit length variant. If this variant is attempted used on a kernel that doesn't support 64-bit lengths, then the request will get errored with .B -EINVAL in the results field of the CQE. This function prepares an async .BR posix_fadvise (2) request. See that man page for details. .SH RETURN VALUE None .SH ERRORS The CQE .I 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 .B -1 on failure and set .I errno to the actual error value, io_uring never uses .IR errno . Instead it returns the negated .I errno directly in the CQE .I res field. .SH SEE ALSO .BR io_uring_get_sqe (3), .BR io_uring_submit (3), .BR io_uring_register (2), .BR posix_fadvise (2)