📄 posix_trace_get_status.html
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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) 2001-2003 The Open Group, All Rights Reserved --><title>posix_trace_get_attr</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="posix_trace_get_attr"></a> <a name="tag_03_469"></a><!-- posix_trace_get_attr --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_469_01"></a>NAME</h4><blockquote>posix_trace_get_attr, posix_trace_get_status - retrieve the trace attributes or trace status(<b>TRACING</b>)</blockquote><h4><a name="tag_03_469_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/trace.h.html">trace.h</a>><br><br> int posix_trace_get_attr(trace_id_t</tt> <i>trid</i><tt>, trace_attr_t *</tt><i>attr</i><tt>);<br> int posix_trace_get_status(trace_id_t</tt> <i>trid</i><tt>,<br> struct posix_trace_status_info *</tt><i>statusinfo</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_469_03"></a>DESCRIPTION</h4><blockquote><p>The <i>posix_trace_get_attr</i>() function shall copy the attributes of the active trace stream identified by <i>trid</i> intothe object pointed to by the <i>attr</i> argument. <sup>[<a href="javascript:open_code('TRL')">TRL</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> If the Trace Log option is supported, <i>trid</i> may represent apre-recorded trace log. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p><p>The <i>posix_trace_get_status</i>() function shall return, in the structure pointed to by the <i>statusinfo</i> argument, thecurrent trace status for the trace stream identified by the <i>trid</i> argument. These status values returned in the structurepointed to by <i>statusinfo</i> shall have been appropriately read to ensure that the returned values are consistent. <sup>[<ahref="javascript:open_code('TRL')">TRL</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> If theTrace Log option is supported and the <i>trid</i> argument refers to a pre-recorded trace stream, the status shall be the status ofthe completed trace stream. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p><p>Each time the <i>posix_trace_get_status</i>() function is used, the overrun status of the trace stream shall be reset toPOSIX_TRACE_NO_OVERRUN immediately after the call completes. <sup>[<a href="javascript:open_code('TRL')">TRL</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> If the Trace Log option is supported, the<i>posix_trace_get_status</i>() function shall behave the same as when the option is not supported except for the followingdifferences:</p><ul><li><p>If the <i>trid</i> argument refers to a trace stream with log, each time the <i>posix_trace_get_status</i>() function is used,the log overrun status of the trace stream shall be reset to POSIX_TRACE_NO_OVERRUN and the <i>flush_error</i> status shall bereset to zero immediately after the call completes.</p></li><li><p>If the <i>trid</i> argument refers to a pre-recorded trace stream, the status returned shall be the status of the completedtrace stream and the status values of the trace stream shall not be reset.</p></li></ul><img src="../images/opt-end.gif" alt="[Option End]" border="0"></blockquote><h4><a name="tag_03_469_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>The <i>posix_trace_get_attr</i>() function stores the trace attributes in the object pointed to by <i>attr</i>, ifsuccessful.</p><p>The <i>posix_trace_get_status</i>() function stores the trace status in the object pointed to by <i>statusinfo</i>, ifsuccessful.</p></blockquote><h4><a name="tag_03_469_05"></a>ERRORS</h4><blockquote><p>These functions shall fail if:</p><dl compact><dt>[EINVAL]</dt><dd>The trace stream argument <i>trid</i> does not correspond to a valid active trace stream or a valid trace log.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_469_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_469_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_469_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_469_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_469_10"></a>SEE ALSO</h4><blockquote><p><a href="posix_trace_attr_destroy.html"><i>posix_trace_attr_destroy</i>()</a> , <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_open.html"><i>posix_trace_open</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <ahref="../basedefs/trace.h.html"><i><trace.h></i></a></p></blockquote><h4><a name="tag_03_469_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 6. Derived from IEEE Std 1003.1q-2000.</p><p>IEEE PASC Interpretation 1003.1 #123 is applied.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><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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