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POSIX_TRACE_EVENTID_EQUAL(3POSIX Programmer's ManPOSIX_TRACE_EVENTID_EQUAL(3P)

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_eventid_equal,		 posix_trace_eventid_get_name,
       posix_trace_trid_eventid_open — manipulate the trace event type identi‐
       fier (TRACING)

SYNOPSIS
       #include <trace.h>

       int posix_trace_eventid_equal(trace_id_t trid, trace_event_id_t event1,
	   trace_event_id_t event2);
       int posix_trace_eventid_get_name(trace_id_t trid,
	   trace_event_id_t event, char *event_name);
       int posix_trace_trid_eventid_open(trace_id_t trid,
	   const char *restrict event_name,
	   trace_event_id_t *restrict event);

DESCRIPTION
       The posix_trace_eventid_equal() function shall compare the trace	 event
       type  identifiers  event1  and event2 from the same trace stream or the
       same trace log identified by the trid argument. If the trace event type
       identifiers  event1  and	 event2	 are from different trace streams, the
       return value shall be unspecified.

       The posix_trace_eventid_get_name() function shall return, in the	 argu‐
       ment pointed to by event_name, the trace event name associated with the
       trace event type identifier identified by the argument event,  for  the
       trace  stream or for the trace log identified by the trid argument. The
       name of the trace event shall have a maximum of	{TRACE_EVENT_NAME_MAX}
       characters (which has the minimum value {_POSIX_TRACE_EVENT_NAME_MAX}).
       Successive calls to this function with the same trace event type	 iden‐
       tifier and the same trace stream identifier shall return the same event
       name.

       The posix_trace_trid_eventid_open() function  shall  associate  a  user
       trace  event  name with a trace event type identifier for a given trace
       stream. The trace stream is identified by the  trid  argument,  and  it
       shall  be  an  active  trace stream. The trace event name is the string
       pointed to by the argument event_name.  It  shall  have	a  maximum  of
       {TRACE_EVENT_NAME_MAX}	characters   (which   has  the	minimum	 value
       {_POSIX_TRACE_EVENT_NAME_MAX}).	The number of user  trace  event  type
       identifiers that can be defined for any given process is limited by the
       maximum value  {TRACE_USER_EVENT_MAX},  which  has  the	minimum	 value
       {_POSIX_TRACE_USER_EVENT_MAX}.

       If    the    Trace    Inherit	option	  is	not   supported,   the
       posix_trace_trid_eventid_open() function shall associate the user trace
       event  name  pointed  to	 by the event_name argument with a trace event
       type identifier that is unique for the  process	being  traced  in  the
       trace  stream  identified  by the trid argument, and is returned in the
       variable pointed to by the event argument. If the user trace event name
       has  already  been  mapped  for the traced process, then the previously
       assigned trace event type identifier shall be  returned.	 If  the  per-
       process	  user	  trace	   event    name    limit    represented    by
       {TRACE_USER_EVENT_MAX}	 has	been	reached,    the	   pre-defined
       POSIX_TRACE_UNNAMED_USEREVENT  (see Table 2-7, Trace Option: User Trace
       Event) user trace event shall be returned.

       If the Trace Inherit option is  supported,  the	posix_trace_trid_even‐
       tid_open()  function  shall associate the user trace event name pointed
       to by the event_name argument with a trace event type  identifier  that
       is  unique for all the processes being traced in the trace stream iden‐
       tified by the trid argument, and is returned in the variable pointed to
       by  the	event  argument. If the user trace event name has already been
       mapped for the traced processes, then  the  previously  assigned	 trace
       event  type identifier shall be returned. If the per-process user trace
       event  name  limit  represented	by  {TRACE_USER_EVENT_MAX}  has	  been
       reached,	 the pre-defined POSIX_TRACE_UNNAMED_USEREVENT (see Table 2-7,
       Trace Option: User Trace Event) user trace event shall be returned.

RETURN VALUE
       Upon  successful	 completion,  the  posix_trace_eventid_get_name()  and
       posix_trace_trid_eventid_open() functions shall return a value of zero.
       Otherwise, they shall return the corresponding error number.

       The posix_trace_eventid_equal() function shall return a non-zero	 value
       if  event1  and	event2	are equal; otherwise, a value of zero shall be
       returned. No errors are defined. If either event1  or  event2  are  not
       valid  trace  event  type identifiers for the trace stream specified by
       trid or if the trid is invalid, the behavior shall be unspecified.

       The posix_trace_eventid_get_name() function stores the trace event name
       value in the object pointed to by event_name, if successful.

       The  posix_trace_trid_eventid_open()  function  stores  the trace event
       type identifier value in the object pointed to by event, if successful.

ERRORS
       The posix_trace_eventid_get_name() and  posix_trace_trid_eventid_open()
       functions shall fail if:

       EINVAL The trid argument was not a valid trace stream identifier.

       The posix_trace_trid_eventid_open() function shall fail if:

       ENAMETOOLONG
	      The  size	 of the name pointed to by the event_name argument was
	      longer	  than	    the	     implementation-defined	 value
	      {TRACE_EVENT_NAME_MAX}.

       The posix_trace_eventid_get_name() function shall fail if:

       EINVAL The  trace  event	 type identifier event was not associated with
	      any name.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       The  posix_trace_eventid_equal(),  posix_trace_eventid_get_name(),  and
       posix_trace_trid_eventid_open()	functions  may	be removed in a future
       version.

SEE ALSO
       Table 2-7, Trace Option: User Trace Event, exec, posix_trace_event(),
       posix_trace_getnext_event()

       The Base Definitions volume of POSIX.1‐2008, <trace.h>

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal  and	 Electronics  Engineers,  Inc  and  The	 Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum	 1  applied.)  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.unix.org/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.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013	 POSIX_TRACE_EVENTID_EQUAL(3P)
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