How to Find File System Information

This section gives a basic overview of the file system control blocks, and shows how to answer the following questions:

• What file system objects are open in a given process?

• What file system objects are open in a VDM?

• What file corresponds to a given handle?

• What processes have opened a given file system object?

If the reader is unfamiliar with this subject then the sections that follow should be read in order:

These topics now follow:

Finding files from handles

Finding files from handles in a VDM

Finding handles from file names

The Record Lock Record

Note:

The examples included in this section are worked on an OS/2 2.11 system. For OS/2 WARP the same techniques work, however the SFTs, whilest they may be located from the SAS in the same manner, they are allocated in segments that are mapped by different selectors. The effect of this is that short-cut techniques used to locate WARP SFTs may need to be re-worked.