очистить поток трассировки и журнал трассировки (TRACING) (clear trace stream and trace log (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_clear — clear trace stream and trace log (TRACING)
Синопсис (Synopsis)
#include <sys/types.h>
#include <trace.h>
int posix_trace_clear(trace_id_t trid);
Описание (Description)
The posix_trace_clear() function shall reinitialize the trace
stream identified by the argument trid as if it were returning
from the posix_trace_create() function, except that the same
allocated resources shall be reused, the mapping of trace event
type identifiers to trace event names shall be unchanged, and the
trace stream status shall remain unchanged (that is, if it was
running, it remains running and if it was suspended, it remains
suspended).
All trace events in the trace stream recorded before the call to
posix_trace_clear() shall be lost. The posix_stream_full_status
status shall be set to POSIX_TRACE_NOT_FULL. There is no
guarantee that all trace events that occurred during the
posix_trace_clear() call are recorded; the behavior with respect
to trace points that may occur during this call is unspecified.
If the Trace Log option is supported and the trace stream has
been created with a log, the posix_trace_clear() function shall
reinitialize the trace stream with the same behavior as if the
trace stream was created without the log, plus it shall
reinitialize the trace log associated with the trace stream
identified by the argument trid as if it were returning from the
posix_trace_create_withlog() function, except that the same
allocated resources, for the trace log, may be reused and the
associated trace stream status remains unchanged. The first
trace event recorded in the trace log after the call to
posix_trace_clear() shall be the same as the first trace event
recorded in the active trace stream after the call to
posix_trace_clear(). The posix_log_full_status status shall be
set to POSIX_TRACE_NOT_FULL. There is no guarantee that all trace
events that occurred during the posix_trace_clear() call are
recorded in the trace log; the behavior with respect to trace
points that may occur during this call is unspecified. If the log
full policy is POSIX_TRACE_APPEND, the effect of a call to this
function is unspecified for the trace log associated with the
trace stream identified by the trid argument.
Возвращаемое значение (Return value)
Upon successful completion, the posix_trace_clear() function
shall return a value of zero. Otherwise, it shall return the
corresponding error number.
Ошибки (Error)
The posix_trace_clear() function shall fail if:
EINVAL The value of the trid argument does not correspond to an
active trace stream.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
The posix_trace_clear() function may be removed in a future
version.
Смотри также (See also)
posix_trace_attr_destroy(3p), posix_trace_create(3p),
posix_trace_get_attr(3p)
The Base Definitions volume of POSIX.1‐2017, sys_types.h(0p),
trace.h(0p)
