D24814.diff
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	Index: lib/libc/sys/read.2
	===================================================================
	--- lib/libc/sys/read.2
	+++ lib/libc/sys/read.2
	@@ -28,7 +28,7 @@
	.\" @(#)read.2 8.4 (Berkeley) 2/26/94
	.\" $FreeBSD$
	.\"
	-.Dd March 30, 2020
	+.Dd May 13, 2020
	.Dt READ 2
	.Os
	.Sh NAME
	@@ -199,9 +199,10 @@
	The file was marked for non-blocking I/O,
	and no data were ready to be read.
	.It Bq Er EISDIR
	-The file descriptor is associated with a directory residing
	-on a file system that does not allow regular read operations on
	-directories (e.g.\& NFS).
	+The file descriptor is associated with a directory.
	+The
	+.Xr readdir 3
	+function should be used instead.
	.It Bq Er EOPNOTSUPP
	The file descriptor is associated with a file system and file type that
	do not allow regular read operations on it.
	Index: sys/kern/vfs_vnops.c
	===================================================================
	--- sys/kern/vfs_vnops.c
	+++ sys/kern/vfs_vnops.c
	@@ -792,6 +792,8 @@
	uio->uio_td, td));
	KASSERT(flags & FOF_OFFSET, ("No FOF_OFFSET"));
	vp = fp->f_vnode;
	+ if (vp->v_type == VDIR)
	+ return (EISDIR);
	ioflag = 0;
	if (fp->f_flag & FNONBLOCK)
	ioflag \|= IO_NDELAY;