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.\" Copyright (C) 2022 Jens Axboe <axboe@kernel.dk> .\" .\" SPDX-License-Identifier: LGPL-2.0-or-later .\" .TH io_uring_prep_send_zc 3 "September 6, 2022" "liburing-2.3" "liburing Manual" .SH NAME io_uring_prep_send_zc \- prepare a zerocopy send request .SH SYNOPSIS .nf .B #include <liburing.h> .PP .BI "void io_uring_prep_send_zc(struct io_uring_sqe *" sqe "," .BI " int " sockfd "," .BI " const void *" buf "," .BI " size_t " len "," .BI " int " flags "," .BI " int " zc_flags ");" .fi .SH DESCRIPTION .PP The .BR io_uring_prep_send_zc (3) function prepares a zerocopy send request. The submission queue entry .I sqe is setup to use the file descriptor .I sockfd to start sending the data from .I buf of size .I len bytes with send modifier flags .IR flags and zerocopy modifier flags .IR zc_flags . This function prepares an async zerocopy .BR send (2) request. See that man page for details. For details on the zerocopy nature of it, see .BR io_uring_enter (2) . .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_prep_send (3), .BR io_uring_enter (2), .BR send (2)
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