.\" Copyright (C) 2024 SUSE LLC.
.\"
.\" SPDX-License-Identifier: LGPL-2.0-or-later
.\"
.TH io_uring_prep_listen 3 "Jun 3, 2024" "liburing-2.7" "liburing Manual"
.SH NAME
io_uring_prep_listen \- prepare a listen request
.SH SYNOPSIS
.nf
.B #include <sys/socket.h>
.B #include <liburing.h>
.PP
.BI "void io_uring_prep_listen(struct io_uring_sqe *" sqe ","
.BI "                          int " sockfd ","
.BI "                          int" backlog ");"
.fi
.SH DESCRIPTION
The
.BR io_uring_prep_listen (3)
function prepares a listen request. The submission queue entry
.I sqe
is setup to place the socket file descriptor pointed by
.IR sockfd
into a state to accept incoming connections.  The parameter
.IR backlog ,
defines the maximum length of the queue of pending connections.

This function prepares an async
.BR listen (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 listen (2)