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



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

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 .



IEEE/The Open Group                  2017                 POSIX_TRACE_START(3)
