RealView Emulation Baseboard Real-Time System Model User Guide: 4.3.1. VFS operations

4.3.1. VFS operations

The VFS supports the following filesystem operations:

getattr: retrieves metadata for the file, directory or symbolic link
mkdir: creates a new directory
remove: removes a file, directory or symbolic link
rename: renames a file, directory or symbolic link
rmdir: removes an empty directory
setattr: sets metadata for the file, directory or symbolic link.
Note
setattr is not currently implemented.

Symbolic link functions are implemented to support symbolic links in Linux, but they are not currently implemented. File permissions are defined but not implemented.

The VFS supports the following mount points:

closemounts: frees the iterator handle returned from openmounts
openmounts: retrieves an iterator handle for the list of available mounts
readmounts: reads one entry from the mount iterator ID.

The VFS supports the following directory iterators:

closedir: frees a directory iterator handle retrieved by opendir
opendir: retrieves an iterator handle for the directory specified
readdir: reads the next entry from the directory iterator.

Note

Datestamps returned are in milliseconds elapsed since the VFS epoch of January 01 1970 00:00 UTC and are host datestamps. The host datestamp might be in the future relative to the simulated OS datestamp.

The VFS supports the following file operations:

closefile: frees a handle opened with openfile
filesync: forces the host OS to flush all file data to persistent storage
getfilesize: returns the current size of a file, in bytes
openfile: returns a handle to the file specified
readfile: reads a block of data from a file
setfilesize: sets the current size of a file in bytes, either by truncating, or extending the file with zeroes
writefile: writes a block of data to a file.

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