Section: POSIX Programmer's Manual (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.
--- clear trace stream and trace log
int posix_trace_clear(trace_id_t trid);
function shall reinitialize the trace stream identified by the argument
as if it were returning from the
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
All trace events in the trace stream recorded before the call to
shall be lost. The
status shall be set to POSIX_TRACE_NOT_FULL.
There is no guarantee that all trace events that occurred during the
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
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
as if it were returning from the
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
shall be the same as the first trace event recorded in the active trace
stream after the call to
status shall be set to POSIX_TRACE_NOT_FULL. There is no guarantee
that all trace events that occurred during the
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
Upon successful completion, the
function shall return a value of zero. Otherwise, it shall return the
corresponding error number.
function shall fail if:
The value of the
argument does not correspond to an active trace stream.
The following sections are informative.
function may be removed in a future version.
The Base Definitions volume of POSIX.1-2008,
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
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