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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 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.


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>


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard for Information Technology -- 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 .