получить и установить фильтр инициализированного потока трассировки (TRACING) (retrieve and set the filter of an initialized trace stream (TRACING))
Пролог (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.
Имя (Name)
posix_trace_get_filter, posix_trace_set_filter — retrieve and set
the filter of an initialized trace stream (TRACING)
Синопсис (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);
Описание (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 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.
Возвращаемое значение (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.
Ошибки (Error)
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.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
The posix_trace_get_filter() and posix_trace_set_filter()
functions may be removed in a future version.
Смотри также (See also)
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.1‐2017, trace.h(0p)
