DosSubSet

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:
• 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.

  ---

  [Back: DosSubFree]
  [Next: DosSuspendThread]