Free access to a device's registers
#include <sys/mman.h>
int munmap_device_io( uintptr_t io,
size_t len );
libc
The function munmap_device_io() unmaps len bytes of device I/O memory
at io (that was previously mapped with
mmap_device_io()).
- -1
- An error occurred (errno is set).
- Any other value
- Successful unmapping.
- 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.
QNX 6
| Safety: | |
|---|
| Cancellation point |
No |
| Interrupt handler |
No |
| Signal handler |
Yes |
| Thread |
Yes |
mmap_device_io(),
munmap()
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