PROLOG

       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.

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

       The posix_trace_clear() function may be removed in a future version.

SEE ALSO

       posix_trace_attr_destroy(), posix_trace_create(), posix_trace_get_attr()

       The Base Definitions volume of POSIX.1‐2017, <sys_types.h>, <trace.h>

COPYRIGHT

       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 .