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
| Safety: |
|
|---|
| Cancellation point |
No |
| Interrupt handler |
No |
| Signal handler |
Yes |
| Thread |
Yes |