Knowledge Base

Filtering All Paging File I/O Under Windows 95

Article ID: 141204

Article Last Modified on 11/21/2006

Microsoft Win32 Application Programming Interface, when used with:
- Microsoft Windows 95

This article was previously published under Q141204

SUMMARY

A file system API hook installed by a VxD by calling IFSMGR_InstallFileSystemAPIHook will not see initial file I/O requests for the paging file unless it installs the hook during Device_Init.

MORE INFORMATION

Some file system API hooker VxDs need to see all file I/O, including all the initial requests for the paging file used by Windows. The FS_ReadFile and FS_WriteFile requests will be sent for the paging file with the R0_SWAPPER_CALL flag set for paging file I/O. The paging file is opened at the Init_Complete system control message sent to VxDs. If the VxD installs the hook during Device_Init, it will see all paging file I/O requests.

Keywords: kbhowto KB141204