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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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POSIX_TRACE_CLEAR(3P) POSIX Programmer's Manual POSIX_TRACE_CLEAR(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_clear — clear trace stream and trace log (TRACING)
#include <sys/types.h>
#include <trace.h>
int posix_trace_clear(trace_id_t trid);
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.
Upon successful completion, the posix_trace_clear() function shall
return a value of zero. Otherwise, it shall return the
corresponding error number.
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.
None.
None.
None.
The posix_trace_clear() function may be removed in a future
version.
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)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
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 2017 POSIX_TRACE_CLEAR(3P)
Pages that refer to this page: trace.h(0p), posix_trace_create(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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