NAME

       posix_trace_start, posix_trace_stop - trace start and stop (TRACING)

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_RUNNING. 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 status 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 status 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.

FUTURE DIRECTIONS

       None.

SEE ALSO

       posix_trace_create() , the Base Definitions volume of IEEE Std 1003.1-2001, <trace.h>

COPYRIGHT

       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 .