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man/io_uring_prep_ftruncate.3
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Jens Axboe
Kill the _GNU_SOURCE games
03 сен 2024, 22:36
03 сен 2024, 22:36
c792105
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.\" Copyright (C) 2024 Tony Solomonik <tony.solomonik@gmail.com> .\" .\" SPDX-License-Identifier: LGPL-2.0-or-later .\" .TH io_uring_prep_ftruncate 3 "January 23, 2024" "liburing-2.6" "liburing Manual" .SH NAME io_uring_prep_ftruncate \- prepare an ftruncate request .SH SYNOPSIS .nf .B #include <liburing.h> .PP .BI "void io_uring_prep_ftruncate(struct io_uring_sqe *" sqe "," .BI " int " fd "," .BI " loff_t " len ");" .fi .SH DESCRIPTION .PP The .BR io_uring_prep_ftruncate (3) function prepares an ftruncate request. The submission queue entry .I sqe is setup to use the file descriptor .I fd that should get truncated to the length indicated by the .I len argument. Applications must define .B _GNU_SOURCE to obtain the definition of this helper, as .I loff_t will not be defined without it. .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 ftruncate (2),