1POSIX_TRACE_START(P)       POSIX Programmer's Manual      POSIX_TRACE_START(P)
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NAME

6       posix_trace_start, posix_trace_stop - trace start and stop (TRACING)
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SYNOPSIS

9       #include <trace.h>
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11       int posix_trace_start(trace_id_t trid);
12       int posix_trace_stop (trace_id_t trid);
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DESCRIPTION

16       The posix_trace_start() and posix_trace_stop() functions, respectively,
17       shall start and stop the trace stream identified by the argument trid.
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19       The  effect  of  calling  the  posix_trace_start()  function  shall  be
20       recorded  in  the  trace  stream  as the POSIX_TRACE_START system trace
21       event and the status of the trace stream shall become  POSIX_TRACE_RUN‐
22       NING.  If the trace stream is in progress when this function is called,
23       the POSIX_TRACE_START system trace event shall not be recorded and  the
24       trace  stream  shall continue to run.  If the trace stream is full, the
25       POSIX_TRACE_START system trace event shall not be recorded and the sta‐
26       tus of the trace stream shall not be changed.
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28       The effect of calling the posix_trace_stop() function shall be recorded
29       in the trace stream as the POSIX_TRACE_STOP system trace event and  the
30       status  of  the trace stream shall become POSIX_TRACE_SUSPENDED. If the
31       trace  stream  is  suspended  when  this  function   is   called,   the
32       POSIX_TRACE_STOP system trace event shall not be recorded and the trace
33       stream shall remain suspended.   If  the  trace  stream  is  full,  the
34       POSIX_TRACE_STOP  system trace event shall not be recorded and the sta‐
35       tus of the trace stream shall not be changed.
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RETURN VALUE

38       Upon successful completion, these functions shall  return  a  value  of
39       zero. Otherwise, they shall return the corresponding error number.
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ERRORS

42       These functions shall fail if:
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44       EINVAL The  value of the argument trid does not correspond to an active
45              trace stream and thus no trace stream was started or stopped.
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47       EINTR  The operation was interrupted by a signal  and  thus  the  trace
48              stream was not necessarily started or stopped.
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51       The following sections are informative.
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EXAMPLES

54       None.
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APPLICATION USAGE

57       None.
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RATIONALE

60       None.
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FUTURE DIRECTIONS

63       None.
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SEE ALSO

66       posix_trace_create()    ,    the    Base    Definitions    volume    of
67       IEEE Std 1003.1-2001, <trace.h>
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70       Portions of this text are reprinted and reproduced in  electronic  form
71       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
72       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
73       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
74       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
75       event of any discrepancy between this version and the original IEEE and
76       The Open Group Standard, the original IEEE and The Open Group  Standard
77       is  the  referee document. The original Standard can be obtained online
78       at http://www.opengroup.org/unix/online.html .
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82IEEE/The Open Group                  2003                 POSIX_TRACE_START(P)
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