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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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POSIX_T...ID_EQUAL(3P) POSIX Programmer's Manual POSIX_T...ID_EQUAL(3P)
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.
posix_trace_eventid_equal, posix_trace_eventid_get_name,
posix_trace_trid_eventid_open — manipulate the trace event type
identifier (TRACING)
#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);
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 Table 2-7, 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 Table 2-7,
Trace Option: User Trace Event) user trace event shall be
returned.
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.
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.
None.
None.
None.
The posix_trace_eventid_equal(), posix_trace_eventid_get_name(),
and posix_trace_trid_eventid_open() functions may be removed in a
future version.
Table 2-7, Trace Option: User Trace Event, exec(1p),
posix_trace_event(3p), posix_trace_getnext_event(3p)
The Base Definitions volume of POSIX.1‐2017, trace.h(0p)
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 .
IEEE/The Open Group 2017 POSIX_T...ID_EQUAL(3P)
Pages that refer to this page: trace.h(0p), exec(3p), fork(3p), posix_trace_create(3p), posix_trace_event(3p), posix_trace_eventset_add(3p), posix_trace_eventtypelist_getnext_id(3p), posix_trace_trid_eventid_open(3p)
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HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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