There is no need to fake handling of /dev/zero here. The vm system ultrix/ultrix_misc.c sunos/sunos_misc.c

does this automagically (and has done it for ages).

1 files changed, 3 insertions, 18 deletions

diff --git a/sys/compat/ultrix/ultrix_misc.c b/sys/compat/ultrix/ultrix_misc.c
index c17a4ffb185..f6885c3887b 100644
--- a/sys/compat/ultrix/ultrix_misc.c
+++ b/sys/compat/ultrix/ultrix_misc.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ultrix_misc.c,v 1.20 2001/10/26 12:03:27 art Exp $	*/
+/*	$OpenBSD: ultrix_misc.c,v 1.21 2001/10/31 10:56:11 art Exp $	*/
 /*	$NetBSD: ultrix_misc.c,v 1.23 1996/04/07 17:23:04 jonathan Exp $	*/
 
 /*
@@ -308,15 +308,12 @@ async_daemon(p, v, retval)
 
 int
 ultrix_sys_mmap(p, v, retval)
-	register struct proc *p;
+	struct proc *p;
 	void *v;
 	register_t *retval;
 {
-	register struct ultrix_sys_mmap_args *uap = v;
+	struct ultrix_sys_mmap_args *uap = v;
 	struct sys_mmap_args ouap;
-	register struct filedesc *fdp;
-	register struct file *fp;
-	register struct vnode *vp;
 
 	/*
 	 * Verify the arguments.
@@ -340,18 +337,6 @@ ultrix_sys_mmap(p, v, retval)
 	SCARG(&ouap, fd) = SCARG(uap, fd);
 	SCARG(&ouap, pos) = SCARG(uap, pos);
 
-	/*
-	 * Special case: if fd refers to /dev/zero, map as MAP_ANON.  (XXX)
-	 */
-	fdp = p->p_fd;
-	if ((fp = fd_getfile(fdp, SCARG(&ouap, fd))) != NULL &&		/*XXX*/
-	    fp->f_type == DTYPE_VNODE &&				/*XXX*/
-	    (vp = (struct vnode *)fp->f_data)->v_type == VCHR &&	/*XXX*/
-	    iszerodev(vp->v_rdev)) {					/*XXX*/
-		SCARG(&ouap, flags) |= MAP_ANON;
-		SCARG(&ouap, fd) = -1;
-	}
-
 	return (sys_mmap(p, &ouap, retval));
 }