POSIX_TRACE_START(3P)                               POSIX Programmer's Manual                              POSIX_TRACE_START(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

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  sys-
       tem  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, Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                         POSIX_TRACE_START(3P)