PDEVFS

The PDEVFS feature is a file system that has been specifically developed for ChorusOS. By convention, it is usually mounted in the /dev and /image directories. It enables an application to create device nodes without having an actual file system such as MSDOSFS, UFS or NFS available. All data structures are maintained in memory and have to be recreated upon each reboot.

It is also used internally by the ChorusOS operating system at system startup time. File types supported are:

• Block/character devices

• Directories

Regular files and FIFOs are not supported in this PDEVFS file system.

PDEVFS API

The PDEVFS API is the one exported by any file system, although most of the system calls will return with an error, since only a limited subset of operations are supported and meaningful. By default, the system mounts the PDEVFS file system as the root.