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<html><!-- This HTML file has been created by texi2html 1.29
from syscalls.texi on 4 June 1994 -->
<TITLE>Syscall specifications of Linux - ioperm</TITLE>
<P>Go to the <A HREF="syscalls_90.html" tppabs="http://www.infran.ru/TechInfo/syscalls/syscalls_90.html">previous</A>, <A HREF="syscalls_92.html" tppabs="http://www.infran.ru/TechInfo/syscalls/syscalls_92.html">next</A> section.<P>
<H2><A NAME="SEC91" HREF="syscalls_toc.html#SEC91" tppabs="http://www.infran.ru/TechInfo/syscalls/syscalls_toc.html#SEC91">ioperm</A></H2>
<P>
<H3>SYNOPSIS</H3>
<P>
<CODE>int ioperm(unsigned long <VAR>from</VAR>, unsigned long <VAR>num</VAR>, int
<VAR>turn_on</VAR>);</CODE>
<P>
<H3>PARAMETERS</H3>
<P>
<VAR>from</VAR>: [in] begining of the range of ports to modify.
<P>
<VAR>num</VAR>: [in] number of ports to modify.
<P>
<VAR>turn_on</VAR>: [in] new permission value of the new ports.
<P>
<H3>DESCRIPTION</H3>
<P>
Modify the permission bits of a range of ports for the current task. The
task must have superuser privileges to use the call. The range of ports
that can be modified is limited to [0,3FFh].
<P>
<H3>RETURN VALUE</H3>
<P>
On success zero is returned. On error -1 is returned and <CODE>errno</CODE> is
set to a value reflecting the kind of error.
<P>
<P>Go to the <A HREF="syscalls_90.html" tppabs="http://www.infran.ru/TechInfo/syscalls/syscalls_90.html">previous</A>, <A HREF="syscalls_92.html" tppabs="http://www.infran.ru/TechInfo/syscalls/syscalls_92.html">next</A> section.<P>