fs: implement UNIX file permissions #62
Description
Permissions / Credentials
- Add a list of uids/gids to each process
- Check process permissions when accessing a file
- Add all the syscalls related to these IDs
New syscalls
UID
- g/setuid()
- g/seteuid()
- setreuid()
- setresuid()
GID
- g/setgid()
- g/setegid()
- setregid()
- setresgid()
Updated syscalls
- wait: GID support