| What: /dev/fieldbus_devX |
| Date: December 2018 |
| KernelVersion: 5.1 (staging) |
| Contact: Sven Van Asbroeck <TheSven73@gmail.com> |
| Description: |
| The cdev interface to drivers for Fieldbus Device Memory |
| (aka. Process Memory). |
| |
| The following file operations are supported: |
| |
| open(2) |
| Create an I/O context associated with the file descriptor. |
| |
| read(2) |
| Read from Process Memory's "read area". |
| Clears POLLERR | POLLPRI from the file descriptor. |
| |
| write(2) |
| Write to Process Memory's "write area". |
| |
| poll(2), select(2), epoll_wait(2) etc. |
| When a "Process Memory Read Area Changed" event occurs, |
| POLLERR | POLLPRI will be set on the file descriptor. |
| Note that POLLIN | POLLOUT events are always set, because the |
| process memory area is always readable and writable. |
| |
| close(2) |
| Free up the I/O context that was associated |
| with the file descriptor. |
| |
| Users: TBD |
