DosGetSeg

This call accesses shared memory allocated by a DosAllocSeg or DosAllocHuge call.

Syntax
DosGetSeg (Selector)

Parameters

 * Selector (SEL) - input : Parameter used to get access to a segment.

Return Code

 * rc (USHORT) - return: Return code descriptions are:
 * 0 NO_ERROR
 * 5 ERROR_ACCESS_DENIED

Remarks
A process may issue DosAllocSeg or DosAllocHuge to allocate shareable segments of memory. The segment may be shareable through DosGiveSeg or DosGetSeg. If the segment is shareable through DosGetSeg, then the process that allocated the memory must pass the selector of the segment to the recipient process using some means of interprocess communication.

If at the time the shared segment is allocated, it is also specified as discardable, it is automatically locked for access by the caller. The caller may free the segment for discard by a DosUnlockSeg call. A process that gains access to the discardable shared segment by calling DosGetSeg has to lock the segment with a DosLockSeg request. However, DosLockSeg may return an error, indicating the segment is already locked. In this case, the process calls DosUnlockSeg repetitively, until the segment is fully unlocked. The process then locks the segment for its own use. Locking is an attribute of the segment, not the processes using the segment.

To access named shared memory allocated with a DosAllocShrSeg request, a process issues DosGetShrSeg.

C

 * 1) define INCL_DOSMEMMGR

USHORT rc = DosGetSeg(Selector); SEL    Selector;      /* Selector to access */ USHORT rc;            /* return code */ 

MASM
 EXTRN DosGetSeg:FAR INCL_DOSMEMMGR     EQU 1

PUSH  WORD    Selector      ;Selector to access CALL  DosGetSeg

Returns WORD 