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

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(P)