DosCreateCSAlias
Bindings: C, MASM
This call creates a code segment alias descriptor for a data segment
passed as input.
DosCreateCSAlias (DataSelector, CodeSelector)
DataSelector (SEL) - input
Data segment selector.
CodeSelector (PSEL) - output
Address where the selector of the code segment alias descriptor is
returned.
rc (USHORT) - return
Return code descriptions are:
0 NO_ERROR
5 ERROR_ACCESS_DENIED
Remarks
A selector returned by a call to DosAllocSeg with no sharing options
specified can be used as the data segment specified with
DosCreateCSAlias. However, to be CS alias, the segment must be a
privilege level 2 or privilege level 3 non-shared segment.
A CS alias segment must be exclusively accessible by the process and
cannot be a huge segment. Selectors of shared memory segments and
dynamically linked global data segments cannot be used as input for
DosCreateCSAlias.
The code segment selector returned by DosCreateCSAlias is valid for CS.
If a procedure is stored in the data segment, it can be called using the
CS alias. The procedure may be called from privilege level 3 or I/O
privilege level.
Use DosFreeSeg to free a CS alias selector created with DosCreateCSAlias.
Procedures in the segment can continue to be referenced if the data
selector for the aliased segment is passed to DosFreeSeg, because the CS
alias selector is not affected. Once both selectors have been passed to
DosFreeSeg, the segment is deallocated.
Family API Considerations
The returned selector is the segment address of the allocated memory.
When the returned selector or the original selector is freed, OS/2
immediately deallocates the block of memory.
Created using Inf-PHP v.2 (c) 2003 Yuri Prokushev
Created using Inf-HTML v.0.9b (c) 1995 Peter Childs