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_eventtypelist_getnext_id,  posix_trace_eventtypelist_rewind  —  iterate over a
       mapping of trace event types (TRACING)

SYNOPSIS

       #include <trace.h>

       int posix_trace_eventtypelist_getnext_id(trace_id_t trid,
           trace_event_id_t *restrict event, int *restrict unavailable);
       int posix_trace_eventtypelist_rewind(trace_id_t trid);

DESCRIPTION

       The first time posix_trace_eventtypelist_getnext_id() is called, the function shall return
       in  the  variable pointed to by event the first trace event type identifier of the list of
       trace events of the trace stream identified by the  trid  argument.  Successive  calls  to
       posix_trace_eventtypelist_getnext_id() return in the variable pointed to by event the next
       trace event type identifier in that same list. Each time a trace event type identifier  is
       successfully  written  into  the  variable  pointed to by the event argument, the variable
       pointed to by the unavailable argument shall be set to zero. When no more trace event type
       identifiers  are  available,  and  so  none  is  returned,  the variable pointed to by the
       unavailable argument shall be set to a value different from zero.

       The posix_trace_eventtypelist_rewind() function shall reset  the  next  trace  event  type
       identifier  to  be  read  to  the first trace event type identifier from the list of trace
       events used in the trace stream identified by trid.

RETURN VALUE

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

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

ERRORS

       These functions shall fail if:

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

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       The    posix_trace_eventtypelist_getnext_id()    and    posix_trace_eventtypelist_rewind()
       functions may be removed in a future version.

SEE ALSO

       posix_trace_event(), posix_trace_eventid_equal(), posix_trace_getnext_event()

       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 .