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QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
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T
_TRACE_GET_STRUCT()
Get the flag from the header of a trace event

QNX Momentics IDE User's Guide
This User's Guide describes version 8.0 of the Integrated Development Environment (IDE) that's part of the QNX Tool Suite.
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QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
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      - trace_func_enter()
        Insert a trace event for the entry to a function
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        Insert a trace event for the exit from a function
      - _TRACE_GET_STRUCT()
        Get the flag from the header of a trace event
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        Insert a trace event for the current address
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        Control the tracing of kernel events
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        Process trace data
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        Attach a callback to a trace event
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_TRACE_GET_STRUCT()

QNX SDP8.0C Library ReferenceAPIDeveloper

Get the flag from the header of a trace event

Synopsis:

#include <sys/trace.h>

#define _TRACE_GET_STRUCT(h)...

Arguments:

h: The header of a trace event, of type unsigned.

Description:

The _TRACE_GET_STRUCT() macro extracts the flag from the header of a trace event (the header member of a traceevent_t or an event_data_t structure). Once you've extracted the flag, you can compare it to the following values to determine whether it's a simple event of part of a combine event:


If the flag equals:	The structure is:
_TRACE_STRUCT_CB	The beginning of a combine event
_TRACE_STRUCT_CC	A continuation of a combine event
_TRACE_STRUCT_CE	The end of a combine event
_TRACE_STRUCT_S	A simple event

Classification:

QNX OS


Safety:
Cancellation point	Yes
Signal handler	Yes
Thread	Yes

Page updated: August 11, 2025