DevHlp_PerfSysTrace writes software trace information to the STRACE buffer.

Calling Sequence in Assembler

MOV   AX, MajorCode
MOV   BX, TraceSize
MOV   CX, MinorCode
LDS   SI, TraceData
MOV   DL, DevHlp_PerfSysTrace
CALL  DevHlp
JC    Error

Results in Assembler

AX = return code.

Possible values

• NO_ERROR
  Data written to trace buffer.
  32902 ERROR_NOMEMORY
  Trace buffer has not been allocated.

  Calling Sequence in C

  #include "dhcalls.h"

  USHORT APIENTRY DevHelp_PerfSysTrace (USHORT Major, USHORT Minor,USHORT TraceSize, PBYTE TraceData)

  Remarks

  A trace buffer must be allocated, wia the STRACE INIT command, before attempting to write trace data.

  Tracing stops once the trace buffer fills up. No error indication is returned. Subsequent calls to DevHelp_PerfSysTrace return immediately without writing any data.

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