sync with ioctl() prototype, and the third argument more clearly

1 files changed, 17 insertions, 6 deletions

diff --git a/lib/libc/sys/ioctl.2 b/lib/libc/sys/ioctl.2
index 400fb9f236a..32ef467d437 100644
--- a/lib/libc/sys/ioctl.2
+++ b/lib/libc/sys/ioctl.2
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: ioctl.2,v 1.6 1999/05/23 14:10:54 aaron Exp $
+.\"	$OpenBSD: ioctl.2,v 1.7 1999/05/28 01:51:48 aaron Exp $
 .\"	$NetBSD: ioctl.2,v 1.5 1995/02/27 12:33:47 cgd Exp $
 .\"
 .\" Copyright (c) 1980, 1991, 1993
@@ -43,7 +43,7 @@
 .Sh SYNOPSIS
 .Fd #include <sys/ioctl.h>
 .Ft int
-.Fn ioctl "int d" "unsigned long request" "char *argp"
+.Fn ioctl "int d" "unsigned long request" "..."
 .Sh DESCRIPTION
 The
 .Fn ioctl
@@ -53,19 +53,30 @@ characteristics of character special files (e.g. terminals)
 may be controlled with
 .Fn ioctl
 requests.
+.Pp
 The argument
 .Fa d
-must be an open file descriptor.
+must be an open file descriptor. The third argument is called
+.Fa arg
+and contains additional information needed by this device
+to perform the requested function.
+.Fa arg
+is either an
+.Fa int
+or a pointer to a device-specific data structure, depending upon
+the given
+.Fa request .
 .Pp
-An  ioctl
+An
+.Nm
 .Fa request
 has encoded in it whether the argument is an
 .Dq in
 parameter
 or
 .Dq out
-parameter, and the size of the argument
-.Fa argp
+parameter, and the size of the third argument
+.Pq Fa arg
 in bytes.
 Macros and defines used in specifying an ioctl
 .Fa request