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.TH POSIX_TRACE_ATTR_GETCLOCKRES "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"
.SH 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.

.SH NAME
posix_trace_attr_getclockres,
posix_trace_attr_getcreatetime,
posix_trace_attr_getgenversion,
posix_trace_attr_getname,
posix_trace_attr_setname
\(em retrieve and set information about a trace stream
(\fBTRACING\fP)
.SH SYNOPSIS
.LP
.nf
#include <time.h>
#include <trace.h>
.P
int posix_trace_attr_getclockres(const trace_attr_t *\fIattr\fP,
    struct timespec *\fIresolution\fP);
int posix_trace_attr_getcreatetime(const trace_attr_t *\fIattr\fP,
    struct timespec *\fIcreatetime\fP);
.P
#include <trace.h>
.P
int posix_trace_attr_getgenversion(const trace_attr_t *\fIattr\fP,
    char *\fIgenversion\fP);
int posix_trace_attr_getname(const trace_attr_t *\fIattr\fP,
    char *\fItracename\fP);
int posix_trace_attr_setname(trace_attr_t *\fIattr\fP,
    const char *\fItracename\fP);
.fi
.SH DESCRIPTION
The
\fIposix_trace_attr_getclockres\fR()
function shall copy the clock resolution of the clock used to generate
timestamps from the
.IR clock-resolution
attribute of the attributes object pointed to by the
.IR attr
argument into the structure pointed to by the
.IR resolution
argument.
.P
The
\fIposix_trace_attr_getcreatetime\fR()
function shall copy the trace stream creation time from the
.IR creation-time
attribute of the attributes object pointed to by the
.IR attr
argument into the structure pointed to by the
.IR createtime
argument. The
.IR creation-time
attribute shall represent the time of creation of the trace stream.
.P
The
\fIposix_trace_attr_getgenversion\fR()
function shall copy the string containing version information from the
.IR generation-version
attribute of the attributes object pointed to by the
.IR attr
argument into the string pointed to by the
.IR genversion
argument. The
.IR genversion
argument shall be the address of a character array which can store at
least
{TRACE_NAME_MAX}
characters.
.P
The
\fIposix_trace_attr_getname\fR()
function shall copy the string containing the trace name from the
.IR trace-name
attribute of the attributes object pointed to by the
.IR attr
argument into the string pointed to by the
.IR tracename
argument. The
.IR tracename
argument shall be the address of a character array which can store at
least
{TRACE_NAME_MAX}
characters.
.P
The
\fIposix_trace_attr_setname\fR()
function shall set the name in the
.IR trace-name
attribute of the attributes object pointed to by the
.IR attr
argument, using the trace name string supplied by the
.IR tracename
argument. If the supplied string contains more than
{TRACE_NAME_MAX}
characters, the name copied into the
.IR trace-name
attribute may be truncated to one less than the length of
{TRACE_NAME_MAX}
characters. The default value is a null string.
.SH "RETURN VALUE"
Upon successful completion, these functions shall return a value of
zero. Otherwise, they shall return the corresponding error number.
.P
If successful, the
\fIposix_trace_attr_getclockres\fR()
function stores the
.IR clock-resolution
attribute value in the object pointed to by
.IR resolution .
Otherwise, the content of this object is unspecified.
.P
If successful, the
\fIposix_trace_attr_getcreatetime\fR()
function stores the trace stream creation time in the object pointed to
by
.IR createtime .
Otherwise, the content of this object is unspecified.
.P
If successful, the
\fIposix_trace_attr_getgenversion\fR()
function stores the trace version information in the string pointed to
by
.IR genversion .
Otherwise, the content of this string is unspecified.
.P
If successful, the
\fIposix_trace_attr_getname\fR()
function stores the trace name in the string pointed to by
.IR tracename .
Otherwise, the content of this string is unspecified.
.SH ERRORS
The
\fIposix_trace_attr_getclockres\fR(),
\fIposix_trace_attr_getcreatetime\fR(),
\fIposix_trace_attr_getgenversion\fR(),
and
\fIposix_trace_attr_getname\fR()
functions may fail if:
.TP
.BR EINVAL
The value specified by one of the arguments is invalid.
.LP
.IR "The following sections are informative."
.SH EXAMPLES
None.
.SH "APPLICATION USAGE"
None.
.SH RATIONALE
None.
.SH "FUTURE DIRECTIONS"
The
\fIposix_trace_attr_getclockres\fR(),
\fIposix_trace_attr_getcreatetime\fR(),
\fIposix_trace_attr_getgenversion\fR(),
\fIposix_trace_attr_getname\fR(),
and
\fIposix_trace_attr_setname\fR()
functions may be removed in a future version.
.SH "SEE ALSO"
.IR "\fIposix_trace_attr_destroy\fR\^(\|)",
.IR "\fIposix_trace_create\fR\^(\|)",
.IR "\fIposix_trace_get_attr\fR\^(\|)",
.IR "\fIuname\fR\^(\|)"
.P
The Base Definitions volume of POSIX.1\(hy2008,
.IR "\fB<time.h>\fP",
.IR "\fB<trace.h>\fP"
.SH COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .

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