манипулировать идентификатором типа события трассировки (TRACING) (manipulate the trace event type identifier (TRACING))
Пролог (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.
Имя (Name)
posix_trace_eventid_equal, posix_trace_eventid_get_name,
posix_trace_trid_eventid_open — manipulate the trace event type
identifier (TRACING)
Синопсис (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);
Описание (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 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.
Возвращаемое значение (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.
Ошибки (Error)
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.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
The posix_trace_eventid_equal(), posix_trace_eventid_get_name(),
and posix_trace_trid_eventid_open() functions may be removed in a
future version.
Смотри также (See also)
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)
