View source for MFSH UNPHYSTOVIRT

{{DISPLAYTITLE:MFSH_UNPHYSTOVIRT}}
Release the selector allocated previously by calling [[MFSH_PHYSTOVIRT]].

==Syntax==
 int far pascal MFSH_UNPHYSTOVIRT(usSel)unsigned short usSel;

==Parameters==
;usSel : contains the selector to released.

==Returns==
If no error is detected, a zero error code is returned. If an error is detected, the following error code is returned:
;ERROR_PROTECTION_VIOLATION: the supplied selector is invalid.

==Sample==
 unsigned short usSel;
 
 int far pascal MFSH_UNPHYSTOVIRT(usSel)

==Remarks==
This helper is for use by a mini-FSD with an imbedded device driver. It is the same as the standard device driver UNPHYSTOVIRT helper.

A caller must issue a corresponding UNPHYSTOVIRT after calling PHYSTOVIRT, before returning to its caller or using any other helpers.

[[Category:IFS Interfaces]]