This function returns the information for the specified queue.

#define INCL_WINMESSAGEMGR /* Or use INCL_WIN, INCL_PM, Also in COMMON section */
#include <os2.h>

HMQ        hmq;         /*  Queue handle. */
PMQINFO    pmqiMqinfo;  /*  Message queue information structure to contain the queue information. */
ULONG      cbCopied;    /*  Size of message queue information structure that is provided (in bytes). */
BOOL       rc;          /*  Success indicator. */

rc = WinQueryQueueInfo(hmq, pmqiMqinfo, cbCopied);