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-.\" Copyright (c) 1993 Michael Haardt
-.\" (michael@moria.de)
-.\" Fri Apr  2 11:32:09 MET DST 1993
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.\" Modified Sat Jul 24 15:12:05 1993 by Rik Faith <faith@cs.unc.edu>
-.\" Modified Tue Aug  1 16:27    1995 by Jochen Karrer
-.\"                              <cip307@cip.physik.uni-wuerzburg.de>
-.\" Modified Tue Oct 22 08:11:14 EDT 1996 by Eric S. Raymond <esr@thyrsus.com>
-.\" Modified Mon Feb 15 17:28:41 CET 1999 by Andries E. Brouwer <aeb@cwi.nl>
-.\" Modified, 27 May 2004, Michael Kerrisk <mtk.manpages@gmail.com>
-.\"     Added notes on capability requirements
-.\"
-.TH ioperm 2 (date) "Linux man-pages (unreleased)"
-.SH NAME
-ioperm \- set port input/output permissions
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sys/io.h>
-.P
-.BI "int ioperm(unsigned long " from ", unsigned long " num ", int " turn_on );
-.fi
-.SH DESCRIPTION
-.BR ioperm ()
-sets the port access permission bits for the calling thread for
-.I num
-bits starting from port address
-.IR from .
-If
-.I turn_on
-is nonzero, then permission for the specified bits is enabled;
-otherwise it is disabled.
-If
-.I turn_on
-is nonzero, the calling thread must be privileged
-.RB ( CAP_SYS_RAWIO ).
-.P
-Before Linux 2.6.8,
-only the first 0x3ff I/O ports could be specified in this manner.
-For more ports, the
-.BR iopl (2)
-system call had to be used (with a
-.I level
-argument of 3).
-Since Linux 2.6.8, 65,536 I/O ports can be specified.
-.P
-Permissions are inherited by the child created by
-.BR fork (2)
-(but see NOTES).
-Permissions are preserved across
-.BR execve (2);
-this is useful for giving port access permissions to unprivileged
-programs.
-.P
-This call is mostly for the i386 architecture.
-On many other architectures it does not exist or will always
-return an error.
-.SH RETURN VALUE
-On success, zero is returned.
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EINVAL
-Invalid values for
-.I from
-or
-.IR num .
-.TP
-.B EIO
-(on PowerPC) This call is not supported.
-.TP
-.B ENOMEM
-.\" Could not allocate I/O bitmap.
-Out of memory.
-.TP
-.B EPERM
-The calling thread has insufficient privilege.
-.SH VERSIONS
-glibc has an
-.BR ioperm ()
-prototype both in
-.I <sys/io.h>
-and in
-.IR <sys/perm.h> .
-Avoid the latter, it is available on i386 only.
-.SH STANDARDS
-Linux.
-.SH HISTORY
-Before Linux 2.4,
-permissions were not inherited by a child created by
-.BR fork (2).
-.SH NOTES
-The
-.I /proc/ioports
-file shows the I/O ports that are currently allocated on the system.
-.SH SEE ALSO
-.BR iopl (2),
-.BR outb (2),
-.BR capabilities (7)