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_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

       The  posix_trace_start()  and  posix_trace_stop()  functions  may  be  removed in a future
       version.

SEE ALSO

       posix_trace_create()

       The Base Definitions volume of POSIX.1‐2017, <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 .