This call reallocates a segment after discard or changes the size of a segment already allocated.
DosReallocSeg (Size, Selector)
- Size (USHORT) - input
- New requested segment size (in bytes). A value of 0 indicates 65536 bytes.
- Selector (SEL) - input
- Segment to be resized.
- rc (USHORT) - return
- Return code descriptions are:
- 0 NO_ERROR
- 5 ERROR_ACCESS_DENIED
- 8 ERROR_NOT_ENOUGH_MEMORY
DosReallocSeg is called to change the size of an unshared or shared segment allocated with a DosAllocSeg request.
Normally, segments allocated as shared (AllocFlags bits 0 and 1 were set) cannot be decreased in size. However, if AllocFlags bit 3 was also set, the shared segment's size can be decreased.
DosReallocSeg is also called to reallocate a segment allocated as discardable (AllocFlags bit 2 set) after the segment is discarded by the system. The call to DosReallocSeg automatically locks the segment for access by the caller, the same as if a DosLockSeg had been issued.
Note: This request may be issued from privilege level 2 or 3, and the segment being resized can be either a privilege level 2 or privilege level 3 segment.
To change the size of huge memory allocated by DosAllocHuge, see DosReallocHuge.
Family API Considerations
Some options operate differently in the DOS mode than in the OS/2 mode. Therefore, the following restriction applies to DosReallocSeg when coding for the DOS mode. The requested Size value is rounded up to the next paragraph (16-byte).
#define INCL_DOSMEMMGR USHORT rc = DosReallocSeg(Size, Selector); USHORT Size; /* New size requested in bytes */ SEL Selector; /* Selector */ USHORT rc; /* return code */
EXTRN DosReallocSeg:FAR INCL_DOSMEMMGR EQU 1 PUSH WORD Size ;New size requested in bytes PUSH WORD Selector ;Selector CALL DosReallocSeg Returns WORD