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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.