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);
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.
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.
These functions shall fail if:
The following sections are informative.
posix_trace_event() , posix_trace_getnext_event() , posix_trace_trid_eventid_open() , the Base Definitions volume of IEEE Std 1003.1-2001, <trace.h>