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POSIX_TRACE_EVENTID_EQUAL(P) POSIX_TRACE_EVENTID_EQUAL(P)
NAME
posix_trace_eventid_equal, posix_trace_eventid_get_name, posix_trace_trid_even-
tid_open - manipulate the trace event type identifier (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 identi-
fiers 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 argument pointed
to by event_name, the trace event name associated with the trace event type identi-
fier 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 identifier 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 repre-
sented by {TRACE_USER_EVENT_MAX} has been reached, the pre-defined
POSIX_TRACE_UNNAMED_USEREVENT (see Trace Option: User Trace Event ) user trace
event shall be returned.
If the Trace Inherit option is supported, the posix_trace_trid_eventid_open() func-
tion shall associate the user trace event name pointed to by the event_name argu-
ment with a trace event type identifier that is unique for all the processes 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 processes, then the previously assigned trace event type
identifier shall be returned. If the per-process user trace event name limit repre-
sented by {TRACE_USER_EVENT_MAX} has been reached, the pre-defined
POSIX_TRACE_UNNAMED_USEREVENT (see 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
None.
SEE ALSO
Trace Option: User Trace Event , posix_trace_event() , posix_trace_getnext_event()
, the Base Definitions volume of IEEE Std 1003.1-2001, <trace.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating
System Interface (POSIX), The Open Group Base 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 .
POSIX 2003 POSIX_TRACE_EVENTID_EQUAL(P)
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