POSIX_TRACE_CLEAR(3P)					     POSIX Programmer's Manual					     POSIX_TRACE_CLEAR(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       posix_trace_clear - clear trace stream and trace log (TRACING)

SYNOPSIS

       #include <sys/types.h>
       #include <trace.h>

       int posix_trace_clear(trace_id_t trid);

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  asso-
       ciated 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.

RETURN VALUE

       Upon  successful  completion,  the  posix_trace_clear() function shall return a value of zero. Otherwise, it shall return the corresponding
       error number.

ERRORS

       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.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       posix_trace_attr_init(),   posix_trace_create(),   posix_trace_flush(),	 posix_trace_get_attr(),   the	 Base	Definitions   volume	of
       IEEE Std 1003.1-2001, <sys/types.h>, <trace.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .

IEEE
/The Open Group						       2003						     POSIX_TRACE_CLEAR(3P)