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iopl.2: Clarify that the two least significant bits of 'level' are what matter 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2013-03-12 16:36:33 +01:00
parent 4e726b9c76
commit fd15ae8345
1 changed files with 3 additions and 2 deletions
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man2/iopl.2
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@ -30,7 +30,7 @@
.\" Modified, 27 May 2004, Michael Kerrisk <mtk.manpages@gmail.com>
.\" Added notes on capability requirements
.\"
.TH IOPL 2 2004-05-27 "Linux" "Linux Programmer's Manual"
.TH IOPL 2 2013-03-15 "Linux" "Linux Programmer's Manual"
.SH NAME
iopl \- change I/O privilege level
.SH SYNOPSIS
@ -39,7 +39,8 @@ iopl \- change I/O privilege level
.BI "int iopl(int " level );
.SH DESCRIPTION
.BR iopl ()
changes the I/O privilege level of the calling process, as specified in
changes the I/O privilege level of the calling process,
as specified by the two least significant bits in
.IR level .
This call is necessary to allow 8514-compatible X servers to run under