DosAllocShrSeg

This call allocates a named shared memory segment to a process.

DosAllocShrSeg

(Size, Name, Selector)

Size (USHORT) - input

Number of bytes requested. The value specified must be less than or equal to 65535. A value of 0 indicates 65536 bytes.
Name (PSZ) - input
Address of the name string associated with the shared memory segment to be allocated. Name specifies the symbolic name for the shared memory segment. The name string is an ASCIIZ string in the format of an OS/2 file name in a subdirectory called \SHAREMEM\. The name string must include the prefix \SHAREMEM\. For example \SHAREMEM\name.
Selector (PSEL) - output
Address where the selector of the allocated segment is returned.
rc (USHORT) - return
Return code descriptions are:
• NO_ERROR 8
  ERROR_NOT_ENOUGH_MEMORY
  123
  ERROR_INVALID_NAME
  183
  ERROR_ALREADY_EXISTS
  Remarks

  DosAllocShrSeg allocates a named segment of up to 64KB in size, which is movable and swappable. The segment can be shared by any process that knows the name of the segment.

  To access the shared segment, another process issues DosGetShrSeg, specifying the segment name. The selector returned by DosGetShrSeg is the same as the one returned by DosAllocShrSeg.

  The maximum number of segments a process can define with DosAllocShrSeg or access with DosGetShrSeg is 256.

  Note: This request may be issued from privilege level 2. However, the segment is allocated as a privilege level 3 segment.

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