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POSIX_TRACE_EVENTID_EQUAL
Section: POSIX Programmer's Manual (3P)
Updated: 2003
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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 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 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 argument 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 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 represented 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()
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 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 represented 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 .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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