получить и установить информацию о потоке трассировки (TRACING) (retrieve and set information about a trace stream (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_attr_getclockres, posix_trace_attr_getcreatetime,
posix_trace_attr_getgenversion, posix_trace_attr_getname,
posix_trace_attr_setname — retrieve and set information about a
trace stream (TRACING)
Синопсис (Synopsis)
#include <time.h>
#include <trace.h>
int posix_trace_attr_getclockres(const trace_attr_t *attr,
struct timespec *resolution);
int posix_trace_attr_getcreatetime(const trace_attr_t *attr,
struct timespec *createtime);
#include <trace.h>
int posix_trace_attr_getgenversion(const trace_attr_t *attr,
char *genversion);
int posix_trace_attr_getname(const trace_attr_t *attr,
char *tracename);
int posix_trace_attr_setname(trace_attr_t *attr,
const char *tracename);
Описание (Description)
The posix_trace_attr_getclockres() function shall copy the clock
resolution of the clock used to generate timestamps from the
clock-resolution attribute of the attributes object pointed to by
the attr argument into the structure pointed to by the resolution
argument.
The posix_trace_attr_getcreatetime() function shall copy the
trace stream creation time from the creation-time attribute of
the attributes object pointed to by the attr argument into the
structure pointed to by the createtime argument. The creation-
time attribute shall represent the time of creation of the trace
stream.
The posix_trace_attr_getgenversion() function shall copy the
string containing version information from the generation-version
attribute of the attributes object pointed to by the attr
argument into the string pointed to by the genversion argument.
The genversion argument shall be the address of a character array
which can store at least {TRACE_NAME_MAX} characters.
The posix_trace_attr_getname() function shall copy the string
containing the trace name from the trace-name attribute of the
attributes object pointed to by the attr argument into the string
pointed to by the tracename argument. The tracename argument
shall be the address of a character array which can store at
least {TRACE_NAME_MAX} characters.
The posix_trace_attr_setname() function shall set the name in the
trace-name attribute of the attributes object pointed to by the
attr argument, using the trace name string supplied by the
tracename argument. If the supplied string contains more than
{TRACE_NAME_MAX} characters, the name copied into the trace-name
attribute may be truncated to one less than the length of
{TRACE_NAME_MAX} characters. The default value is a null string.
Возвращаемое значение (Return value)
Upon successful completion, these functions shall return a value
of zero. Otherwise, they shall return the corresponding error
number.
If successful, the posix_trace_attr_getclockres() function stores
the clock-resolution attribute value in the object pointed to by
resolution. Otherwise, the content of this object is
unspecified.
If successful, the posix_trace_attr_getcreatetime() function
stores the trace stream creation time in the object pointed to by
createtime. Otherwise, the content of this object is
unspecified.
If successful, the posix_trace_attr_getgenversion() function
stores the trace version information in the string pointed to by
genversion. Otherwise, the content of this string is
unspecified.
If successful, the posix_trace_attr_getname() function stores the
trace name in the string pointed to by tracename. Otherwise, the
content of this string is unspecified.
Ошибки (Error)
The posix_trace_attr_getclockres(),
posix_trace_attr_getcreatetime(),
posix_trace_attr_getgenversion(), and posix_trace_attr_getname()
functions may fail if:
EINVAL The value specified by one of the arguments is invalid.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
The posix_trace_attr_getclockres(),
posix_trace_attr_getcreatetime(),
posix_trace_attr_getgenversion(), posix_trace_attr_getname(), and
posix_trace_attr_setname() functions may be removed in a future
version.
Смотри также (See also)
posix_trace_attr_destroy(3p), posix_trace_create(3p),
posix_trace_get_attr(3p), uname(3p)
The Base Definitions volume of POSIX.1‐2017, time.h(0p),
trace.h(0p)
