- 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 iden-
       tified 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  suc-
       cessful.

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.

       Specifications Issue 6, Copyright (C) 2001-2003  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 .