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Add mention of the _IO() ioctl type: ioctls that just frob something

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in the kernel, but don't copy anything in or out.
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atatat 2001-09-13 17:19:55 +00:00
parent 875a8b9cee
commit 28b7bb87a2
1 changed files with 4 additions and 1 deletions
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share/man/man9/ioctl.9
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@ -1,4 +1,4 @@
.\" $NetBSD: ioctl.9,v 1.10 2001/09/10 23:36:57 wiz Exp $
.\" $NetBSD: ioctl.9,v 1.11 2001/09/13 17:19:55 atatat Exp $
.\"
.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -61,6 +61,9 @@ system call. E.g. ioctl(s,FOOIOCTL,...)
.It Fn fun
a macro which can be one of
.Bl -tag -width _IOWR
.It _IO
the call is a simple message to the kernel by itself. It does not copy
anything into the kernel, nor does it want anything back.
.It _IOR
the call only reads parameters from the kernel and does not
pass any to it