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POSIX_TRACE_GET_FILTER(P) POSIX_TRACE_GET_FILTER(P)
NAME
posix_trace_get_filter, posix_trace_set_filter - retrieve and set the filter of an
initialized trace stream (TRACING)
SYNOPSIS
#include <trace.h>
int posix_trace_get_filter(trace_id_t trid, trace_event_set_t *set);
int posix_trace_set_filter(trace_id_t trid,
const trace_event_set_t *set, int how);
DESCRIPTION
The posix_trace_get_filter() function shall retrieve, into the argument pointed to
by set, the actual trace event filter from the trace stream specified by trid.
The posix_trace_set_filter() function shall change the set of filtered trace event
types after a trace stream identified by the trid argument is created. This func-
tion may be called prior to starting the trace stream, or while the trace stream is
active. By default, if no call is made to posix_trace_set_filter(), all trace
events shall be recorded (that is, none of the trace event types are filtered out).
If this function is called while the trace is in progress, a special system trace
event, POSIX_TRACE_FILTER, shall be recorded in the trace indicating both the old
and the new sets of filtered trace event types (see Trace and Trace Event Filter
Options: System Trace Events and Trace, Trace Log, and Trace Event Filter Options:
System Trace Events ).
If the posix_trace_set_filter() function is interrupted by a signal, an error shall
be returned and the filter shall not be changed. In this case, the state of the
trace stream shall not be changed.
The value of the argument how indicates the manner in which the set is to be
changed and shall have one of the following values, as defined in the <trace.h>
header:
POSIX_TRACE_SET_EVENTSET
The resulting set of trace event types to be filtered shall be the trace
event type set pointed to by the argument set.
POSIX_TRACE_ADD_EVENTSET
The resulting set of trace event types to be filtered shall be the union of
the current set and the trace event type set pointed to by the argument set.
POSIX_TRACE_SUB_EVENTSET
The resulting set of trace event types to be filtered shall be all trace
event types in the current set that are not in the set pointed to by the
argument set; that is, remove each element of the specified set from the
current filter.
RETURN VALUE
Upon successful completion, these functions shall return a value of zero. Other-
wise, they shall return the corresponding error number.
The posix_trace_get_filter() function stores the set of filtered trace event types
in set, if successful.
ERRORS
These functions shall fail if:
EINVAL The value of the trid argument does not correspond to an active trace stream
or the value of the argument pointed to by set is invalid.
EINTR The operation was interrupted by a signal.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
Trace and Trace Event Filter Options: System Trace Events , Trace, Trace Log, and
Trace Event Filter Options: System Trace Events , posix_trace_eventset_add() , the
Base Definitions volume of IEEE Std 1003.1-2001, <trace.h>
COPYRIGHT
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 .
POSIX 2003 POSIX_TRACE_GET_FILTER(P)
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