1POSIX_TRACE_START(3P)      POSIX Programmer's Manual     POSIX_TRACE_START(3P)
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PROLOG

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

12       posix_trace_start, posix_trace_stop — trace start and stop (TRACING)
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SYNOPSIS

15       #include <trace.h>
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17       int posix_trace_start(trace_id_t trid);
18       int posix_trace_stop (trace_id_t trid);
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DESCRIPTION

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

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

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

58       None.
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APPLICATION USAGE

61       None.
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RATIONALE

64       None.
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FUTURE DIRECTIONS

67       The posix_trace_start() and posix_trace_stop() functions may be removed
68       in a future version.
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SEE ALSO

71       posix_trace_create()
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73       The Base Definitions volume of POSIX.1‐2017, <trace.h>
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76       Portions  of  this text are reprinted and reproduced in electronic form
77       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
78       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
79       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
80       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
81       event of any discrepancy between this version and the original IEEE and
82       The  Open Group Standard, the original IEEE and The Open Group Standard
83       is the referee document. The original Standard can be  obtained  online
84       at http://www.opengroup.org/unix/online.html .
85
86       Any  typographical  or  formatting  errors that appear in this page are
87       most likely to have been introduced during the conversion of the source
88       files  to  man page format. To report such errors, see https://www.ker‐
89       nel.org/doc/man-pages/reporting_bugs.html .
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93IEEE/The Open Group                  2017                POSIX_TRACE_START(3P)
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