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POSIX_TRACE_GET_FILTER(3P)POSIX Programmer's ManualOSIX_TRACE_GET_FILTER(3P)
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.
posix_trace_get_filter, posix_trace_set_filter — retrieve and set the
filter of an initialized trace stream (TRACING)
#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);
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 Table 2-4, Trace and Trace Event Filter Options:
System Trace Events and Table 2-6, 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.
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.
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.
None.
None.
None.
The posix_trace_get_filter() and posix_trace_set_filter() functions
may be removed in a future version.
Table 2-4, Trace and Trace Event Filter Options: System Trace Events,
Table 2-6, Trace, Trace Log, and Trace Event Filter Options: System
Trace Events, posix_trace_eventset_add(3p)
The Base Definitions volume of POSIX.1‐2008, trace.h(0p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) 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.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 POSIX_TRACE_GET_FILTER(3P)
Pages that refer to this page: trace.h(0p), posix_trace_close(3p), posix_trace_create(3p), posix_trace_eventset_add(3p), posix_trace_set_filter(3p)