D21634.diff
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	Index: head/lib/libc/sys/open.2
	===================================================================
	--- head/lib/libc/sys/open.2
	+++ head/lib/libc/sys/open.2
	@@ -28,7 +28,7 @@
	.\" @(#)open.2 8.2 (Berkeley) 11/16/93
	.\" $FreeBSD$
	.\"
	-.Dd June 14, 2019
	+.Dd September 17, 2019
	.Dt OPEN 2
	.Os
	.Sh NAME
	@@ -419,6 +419,11 @@
	.It Bq Er EISDIR
	The named file is a directory, and the arguments specify
	it is to be modified.
	+.It Bq Er EISDIR
	+The named file is a directory, and the flags specified
	+.Dv O_CREAT
	+without
	+.Dv O_DIRECTORY .
	.It Bq Er EROFS
	The named file resides on a read-only file system,
	and the file is to be modified.
	Index: head/sys/kern/vfs_vnops.c
	===================================================================
	--- head/sys/kern/vfs_vnops.c
	+++ head/sys/kern/vfs_vnops.c
	@@ -264,6 +264,10 @@
	error = EEXIST;
	goto bad;
	}
	+ if (vp->v_type == VDIR) {
	+ error = EISDIR;
	+ goto bad;
	+ }
	fmode &= ~O_CREAT;
	}
	} else {