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i386_get_ioperm(2)
NAME
i386_get_ioperm, i386_set_ioperm -- manage per-process access to the i386
I/O port space
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <machine/sysarch.h>
int
i386_get_ioperm(unsigned int start, unsigned int *length, int *enable);
int
i386_set_ioperm(unsigned int start, unsigned int length, int enable);
DESCRIPTION
The i386_get_ioperm() system call will return the permission for the
process' I/O port space in the *enable argument. The port range starts
at start and the number of contiguous entries will be returned in
*length.
The i386_set_ioperm() system call will set access to a range of I/O ports
described by the start and length arguments to the state specified by the
enable argument.
RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the
value -1 is returned and the global variable errno is set to indicate the
error.
ERRORS
The i386_get_ioperm() and i386_set_ioperm() system calls will fail if:
[EINVAL] An invalid range was specified by the start or length
arguments.
[EPERM] The caller of i386_set_ioperm was not the superuser.
SEE ALSO
io(4)
AUTHORS
This man page was written by Jonathan Lemon.
FreeBSD 5.4 July 27, 1998 FreeBSD 5.4
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