DosSubSet

Bindings:  C, MASM 

This call is used to initialize a segment or to reset a reallocated 
segment for suballocation. 

 DosSubSet    (SegSelector, Flags, Size) 
 

 SegSelector (SEL) - input 
    Target data segment selector. 

 Flags (USHORT) - input 
    0 = Increasing the size of a segment already initialized. 

    1 = Initializing a segment. 

 Size (USHORT) - input 
    Segment size in bytes. 
 

 rc (USHORT) - return 
    Return code descriptions are: 

    0         NO_ERROR 
    310       ERROR_DOSSUB_SHRINK 
    313       ERROR_DOSSUB_BADSIZE 
    314       ERROR_DOSSUB_BADFLAG 
 
 Remarks 

 To initialize a segment for suballocation, issue DosSubSet before issuing 
 DosSubAlloc and set Flags = 1.  The segment must have been allocated with 
 DosAllocSeg or DosAllocShrSeg. 

 If a segment allocated by a DosAllocSeg call has already been set for 
 suballocation, and a call to DosSubAlloc returns Error_DOSSUB_NOMEM, the 
 segment's size can be increased by a call to DosReallocSeg. After 
 reallocation, the segment must be reset by a DosSubSet. Failure to reset 
 the segment after changing its size can yield unpredictable results. 

 The size parameter should be a multiple of four bytes, or it is rounded 
 up to a multiple of four.  Note in DosSubSet, a size parameter of 0 
 indicates the segment is 64KB, while in DosSubAlloc and  DosSubFree, a 
 size parameter of 0 is an error.  Other than this special case of 0 
 meaning 64KB, the minimum size that can be set is 12 bytes.