traceparser_cs()

Arguments:

stateptr

A pointer to an opaque data structure that contains the parser's state information, obtained by calling traceparser_init().

userdata

A pointer to arbitrary user data that you want to be passed to the callback function when it's executed.

funcptr

A pointer to the callback function that you want to register. For more information, see Callback function, below.

class

The class of trace events that you want to invoke the callback function for. For information about the supported classes, see Classes and events in the Events and the Kernel chapter of the System Analysis Toolkit User's Guide.

event

The specific trace event that you want to invoke the callback function for. This event must be a member of the given class. For information about the classes and trace events, see Classes and events in the Events and the Kernel chapter of the System Analysis Toolkit User's Guide.

You can OR the event number with _NTO_TRACE_KERCALL64. In this case, the callback is invoked only for kernel events that include 64-bit data types. You might also want to attach a callback for the event without _NTO_TRACE_KERCALL64.

Library:

libtraceparser

Use the -l traceparser option to qcc to link against this library.

Description:

The traceparser_cs() function attaches the callback function specified by the pointer funcptr, to one particular event, from one particular class. You'll use this function if you're creating your own utility for parsing trace data (as an alternative to traceprinter).

Callback function

The synopsis of the callback function is defined by the tracep_callb_func_t data type as follows:

int my_callback( struct traceparser_state* statepointer,
                 void *userdata,
                 unsigned header,
                 unsigned timestamp,
                 unsigned *darray,
                 unsigned darray_count)

The arguments are:

stateptr

A pointer to the parser's state information, obtained by calling traceparser_init().

userdata

A pointer to arbitrary user data that you want to pass to the callback function.

header

The header of the event. For information about some macros for extracting information from this member, see _NTO_TRACE_GET*().

timestamp

The lower 32 bits of the timestamp for the event.

darray

An array of type unsigned that holds the data associated with the event. For more information, see the Current Trace Events and Data appendix of the System Analysis Toolkit (SAT) User's Guide.

darray_count

The number of entries in the darray array.

The callback should return 0 to indicate success, and -1 to indicate failure.

Returns:

0

Success.

-1

Failure; errno is set. See also traceparser_get_info() for further details.

Classification:

QNX OS