These primitives manipulate sets of trace event types. They operate on data
objects addressable by the application, not on the current trace event filter
of any trace stream.
The posix_trace_eventset_add() and posix_trace_eventset_del()
functions, respectively, shall add or delete the individual trace event type
specified by the value of the argument event_id to or from the trace
event type set pointed to by the argument set. Adding a trace event
type already in the set or deleting a trace event type not in the set shall
not be considered an error.
The posix_trace_eventset_empty() function shall initialize the trace
event type set pointed to by the set argument such that all trace event
types defined, both system and user, shall be excluded from the set.
The posix_trace_eventset_fill() function shall initialize the trace event
type set pointed to by the argument set, such that the set of trace
event types defined by the argument what shall be included in the set.
The value of the argument what shall consist of one of the following
values, as defined in the <trace.h> header:
All the process-independent implementation-defined system trace event types
are included in the set.
All the implementation-defined system trace event types are included in the
set, as are those defined in IEEE Std 1003.1-2001.
All trace event types defined, both system and user, are included in the
Applications shall call either posix_trace_eventset_empty() or
posix_trace_eventset_fill() at least once for each object of type
trace_event_set_t prior to any other use of that object. If such an
object is not initialized in this way, but is nonetheless supplied as an
argument to any of the posix_trace_eventset_add(),
posix_trace_eventset_del(), or posix_trace_eventset_ismember()
functions, the results are undefined.
The posix_trace_eventset_ismember() function shall test whether the trace
event type specified by the value of the argument event_id is a member
of the set pointed to by the argument set. The value returned in the
object pointed to by ismember argument is zero if the trace event type
identifier is not a member of the set and a value different from zero if it is
a member of the set.
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html