D31821.diff
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	diff --git a/lib/libc/sys/listen.2 b/lib/libc/sys/listen.2
	--- a/lib/libc/sys/listen.2
	+++ b/lib/libc/sys/listen.2
	@@ -28,7 +28,7 @@
	.\" From: @(#)listen.2 8.2 (Berkeley) 12/11/93
	.\" $FreeBSD$
	.\"
	-.Dd April 14, 2020
	+.Dd October 11, 2022
	.Dt LISTEN 2
	.Os
	.Sh NAME
	@@ -106,10 +106,13 @@
	.Fa backlog ;
	if a value greater than
	.Va kern.ipc.soacceptqueue
	-or less than zero is specified,
	+is specified,
	.Fa backlog
	is silently forced to
	.Va kern.ipc.soacceptqueue .
	+If a negative value is used,
	+.Fa backlog
	+is silently forced to 0.
	.Pp
	If the listen queue overflows, the kernel will emit a LOG_DEBUG syslog message.
	The
	@@ -191,3 +194,8 @@
	is still available but hidden from a
	.Xr sysctl 3
	-a output so that existing applications and scripts continue to work.
	+To improve POSIX compliance, a negative
	+.Fa backlog
	+argument is handled the same as 0.
	+This was introduced in
	+.Fx 14.0 .
	diff --git a/sys/kern/uipc_socket.c b/sys/kern/uipc_socket.c
	--- a/sys/kern/uipc_socket.c
	+++ b/sys/kern/uipc_socket.c
	@@ -1075,7 +1075,9 @@
	so->so_options \|= SO_ACCEPTCONN;

	listening:
	- if (backlog < 0 \|\| backlog > somaxconn)
	+ if (backlog < 0)
	+ backlog = 0;
	+ if (backlog > somaxconn)
	backlog = somaxconn;
	so->sol_qlimit = backlog;