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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2004 IEEE and The Open Group, All Rights Reserved --><title>posix_trace_attr_getclockres</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="posix_trace_attr_getclockres"></a> <a name="tag_03_448"></a><!-- posix_trace_attr_getclockres --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2004 Edition<br>Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_448_01"></a>NAME</h4><blockquote>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 (<b>TRACING</b>)</blockquote><h4><a name="tag_03_448_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('TRC')">TRC</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/time.h.html">time.h</a>><br> #include <<a href="../basedefs/trace.h.html">trace.h</a>><br><br> int posix_trace_attr_getclockres(const trace_attr_t *</tt><i>attr</i><tt>,<br> struct timespec *</tt><i>resolution</i><tt>);<br> int posix_trace_attr_getcreatetime(const trace_attr_t *</tt><i>attr</i><tt>,<br> struct timespec *</tt><i>createtime</i><tt>);<br><br><br> #include <<a href="../basedefs/trace.h.html">trace.h</a>><br> int posix_trace_attr_getgenversion(const trace_attr_t *</tt><i>attr</i><tt>,<br> char *</tt><i>genversion</i><tt>);<br> int posix_trace_attr_getname(const trace_attr_t *</tt><i>attr</i><tt>,<br> char *</tt><i>tracename</i><tt>);<br> int posix_trace_attr_setname(trace_attr_t *</tt><i>attr</i><tt>,<br> const char *</tt><i>tracename</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]"border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_448_03"></a>DESCRIPTION</h4><blockquote><p>The <i>posix_trace_attr_getclockres</i>() function shall copy the clock resolution of the clock used to generate timestamps fromthe <i>clock-resolution</i> attribute of the attributes object pointed to by the <i>attr</i> argument into the structure pointed toby the <i>resolution</i> argument.</p><p>The <i>posix_trace_attr_getcreatetime</i>() function shall copy the trace stream creation time from the <i>creation-time</i>attribute of the attributes object pointed to by the <i>attr</i> argument into the structure pointed to by the <i>createtime</i>argument. The <i>creation-time</i> attribute shall represent the time of creation of the trace stream.</p><p>The <i>posix_trace_attr_getgenversion</i>() function shall copy the string containing version information from the<i>generation-version</i> attribute of the attributes object pointed to by the <i>attr</i> argument into the string pointed to bythe <i>genversion</i> argument. The <i>genversion</i> argument shall be the address of a character array which can store at least{TRACE_NAME_MAX} characters.</p><p>The <i>posix_trace_attr_getname</i>() function shall copy the string containing the trace name from the <i>trace-name</i>attribute of the attributes object pointed to by the <i>attr</i> argument into the string pointed to by the <i>tracename</i>argument. The <i>tracename</i> argument shall be the address of a character array which can store at least {TRACE_NAME_MAX}characters.</p><p>The <i>posix_trace_attr_setname</i>() function shall set the name in the <i>trace-name</i> attribute of the attributes objectpointed to by the <i>attr</i> argument, using the trace name string supplied by the <i>tracename</i> argument. If the suppliedstring contains more than {TRACE_NAME_MAX} characters, the name copied into the <i>trace-name</i> attribute may be truncated to oneless than the length of {TRACE_NAME_MAX} characters. The default value is a null string.</p></blockquote><h4><a name="tag_03_448_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, these functions shall return a value of zero. Otherwise, they shall return the corresponding errornumber.</p><p>If successful, the <i>posix_trace_attr_getclockres</i>() function stores the <i>clock-resolution</i> attribute value in theobject pointed to by <i>resolution</i>. Otherwise, the content of this object is unspecified.</p><p>If successful, the <i>posix_trace_attr_getcreatetime</i>() function stores the trace stream creation time in the object pointedto by <i>createtime</i>. Otherwise, the content of this object is unspecified.</p><p>If successful, the <i>posix_trace_attr_getgenversion</i>() function stores the trace version information in the string pointedto by <i>genversion</i>. Otherwise, the content of this string is unspecified.</p><p>If successful, the <i>posix_trace_attr_getname</i>() function stores the trace name in the string pointed to by<i>tracename</i>. Otherwise, the content of this string is unspecified.</p></blockquote><h4><a name="tag_03_448_05"></a>ERRORS</h4><blockquote><p>The <i>posix_trace_attr_getclockres</i>(), <i>posix_trace_attr_getcreatetime</i>(), <i>posix_trace_attr_getgenversion</i>(), and<i>posix_trace_attr_getname</i>() functions may fail if:</p><dl compact><dt>[EINVAL]</dt><dd>The value specified by one of the arguments is invalid.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_448_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_448_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_448_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_448_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_448_10"></a>SEE ALSO</h4><blockquote><p><a href="posix_trace_attr_init.html"><i>posix_trace_attr_init</i>()</a>, <a href="posix_trace_create.html"><i>posix_trace_create</i>()</a>, <a href="posix_trace_get_attr.html"><i>posix_trace_get_attr</i>()</a>,<a href="uname.html"><i>uname</i>()</a>, the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/time.h.html"><i><time.h></i></a>, <a href="../basedefs/trace.h.html"><i><trace.h></i></a></p></blockquote><h4><a name="tag_03_448_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 6. Derived from IEEE Std 1003.1q-2000.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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