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munmap_device_io()

Free access to a device's registers

Synopsis:

#include <sys/mman.h>

int munmap_device_io( uintptr_t io,
                      size_t len );

Arguments:

io

The address of the area that you want to unmap.

len

The number of bytes of device I/O memory that you want to unmap.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The function munmap_device_io() unmaps len bytes of device I/O memory at io (that was previously mapped with mmap_device_io()).

Returns:

-1

An error occurred (errno is set).

Any other value

Successful unmapping.

Errors:

EINVAL

The addresses in the specified range are outside the range allowed for the address space of a process.

ENOSYS

The function munmap() isn't supported by this implementation.

ENXIO

The address from io for len bytes is invalid.

Classification:

QNX Neutrino

See also:

mmap_device_io(), munmap()