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POSIX_TRACE_GET_FILTER
Section: POSIX Programmer's Manual (3P)
Updated: 2003
Index
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PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
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 function 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. Otherwise, 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 .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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