Returns information about local named pipes that are attached to a semaphore.

#define INCL_DOSNMPIPES
#include <os2.h>

HSEM             hsem;   /*  The handle of a shared event or muxwait semaphore that was previously attached to one or more named pipes with DosSetNPipeSem. */
PPIPESEMSTATE    pnpss;  /*  A pointer to a buffer containing a record for each named pipe that is attached to the semaphore. */
ULONG            cbBuf;  /*  The size, in bytes, of pnpss. */
APIRET           ulrc;   /*  Return Code. */

ulrc = DosQueryNPipeSemState(hsem, pnpss,
         cbBuf);