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  i386_get_ioperm(2)
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i386_set_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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