SYNOPSIS
       #include <trace.h>

       int posix_trace_start(trace_id_t trid);
       int posix_trace_stop (trace_id_t trid);


DESCRIPTION
       The posix_trace_start() and posix_trace_stop() functions, respectively,
       shall start and stop the trace stream identified by the argument trid.

       The  effect  of  calling  the  posix_trace_start()  function  shall  be
       recorded  in  the  trace  stream  as the POSIX_TRACE_START system trace
       event and the status of the trace stream shall become  POSIX_TRACE_RUN-
       NING.  If the trace stream is in progress when this function is called,
       the POSIX_TRACE_START system trace event shall not be recorded and  the
       trace  stream  shall continue to run.  If the trace stream is full, the
       POSIX_TRACE_START system trace event shall not be recorded and the sta-
       tus of the trace stream shall not be changed.

       The effect of calling the posix_trace_stop() function shall be recorded
       in the trace stream as the POSIX_TRACE_STOP system trace event and  the
       status  of  the trace stream shall become POSIX_TRACE_SUSPENDED. If the
       trace  stream  is  suspended  when  this  function   is   called,   the
       POSIX_TRACE_STOP system trace event shall not be recorded and the trace
       stream shall remain suspended.   If  the  trace  stream  is  full,  the
       POSIX_TRACE_STOP  system trace event shall not be recorded and the sta-
       tus of the trace stream shall not be changed.

RETURN VALUE
       Upon successful completion, these functions shall  return  a  value  of
       zero. Otherwise, they shall return the corresponding error number.

ERRORS
       These functions shall fail if:

       EINVAL The  value of the argument trid does not correspond to an active
              trace stream and thus no trace stream was started or stopped.

       EINTR  The operation was interrupted by a signal  and  thus  the  trace
              stream was not necessarily started or stopped.


       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.
       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 .