Tracing Queue Calls API return information

QUECALLS APIs

QUECALLS APIs are entered indirectly via DOSCALL1 as shown below:

             APPL ────> DOSCALL1  ─────> QUECALLS
                  <──── DOSCALL1  <─────

To trace QUECALLS API parameters and results use TRACE ON QUECALLS(.....). To trace the API return addresses use TRACE ON DOSCALL1(.....).

Note: The QUECALLS entry points in DOSCALL1 have been grouped using group id QUE. All the API return addresses may be traced by specifying TRACE ON DOSCALL1(QUE).

The following is an example of QUECALLS traced output activated using

   TRACE ON DOSCALL1(QUE)
   TRACE ON QUECALLS

(OS) DosReadQueue Pre-Invocation
Event [1]  Major [22/0x0016]  Minor [7/0x0007]  PID [109/0x006d]  Length [21]  Time [10:58:14.97]
Handle=0014   Element Code=0000
Semaphore Handle=0027 75E4   No Wait Flag=00

(OS) Dos16ReadQueue Pre-Invocation
Event [2]  Major [16/0x0010]  Minor [360/0x0168]  PID [109/0x006d]  Length [7]  Time [10:58:14.97]
Return address = 000F:47EC

In this example the return address to the 16-bit caller is given in minor code 360 of DOSCALL1.

For a list of indirected QUECALLS tracepoits see: QUECALLS API Tracepoints Indirected Via DOSCALL1.

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