📄 posix_trace_eventid_get_name.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_eventid_equal</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="posix_trace_eventid_equal"></a> <a name="tag_03_464"></a><!-- posix_trace_eventid_equal --> <!--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_464_01"></a>NAME</h4><blockquote>posix_trace_eventid_equal, posix_trace_eventid_get_name, posix_trace_trid_eventid_open - manipulate the trace eventtype identifier (<b>TRACING</b>)</blockquote><h4><a name="tag_03_464_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_eventid_equal(trace_id_t</tt> <i>trid</i><tt>, trace_event_id_t</tt> <i>event1</i><tt>,<br> trace_event_id_t</tt> <i>event2</i><tt>);<br> int posix_trace_eventid_get_name(trace_id_t</tt> <i>trid</i><tt>,<br> trace_event_id_t</tt> <i>event</i><tt>, char *</tt><i>event_name</i><tt>);<br> <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div><div class="box"><code><tt><sup>[<a href="javascript:open_code('TRC TEF')">TRC TEF</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> int posix_trace_trid_eventid_open(trace_id_t</tt> <i>trid</i><tt>,<br> const char *restrict</tt> <i>event_name</i><tt>,<br> trace_event_id_t *restrict</tt> <i>event</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_464_03"></a>DESCRIPTION</h4><blockquote><p>The <i>posix_trace_eventid_equal</i>() function shall compare the trace event type identifiers <i>event1</i> and <i>event2</i>from the same trace stream or the same trace log identified by the <i>trid</i> argument. If the trace event type identifiers<i>event1</i> and <i>event2</i> are from different trace streams, the return value shall be unspecified.</p><p>The <i>posix_trace_eventid_get_name</i>() function shall return, in the argument pointed to by <i>event_name</i>, the traceevent name associated with the trace event type identifier identified by the argument <i>event</i>, for the trace stream or for thetrace log identified by the <i>trid</i> 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 eventtype identifier and the same trace stream identifier shall return the same event name.</p><p><sup>[<a href="javascript:open_code('TEF')">TEF</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">The <i>posix_trace_trid_eventid_open</i>() function shall associate a user trace event name with a trace event type identifier fora given trace stream. The trace stream is identified by the <i>trid</i> argument, and it shall be an active trace stream. The traceevent name is the string pointed to by the argument <i>event_name</i>. 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 definedfor any given process is limited by the maximum value {TRACE_USER_EVENT_MAX}, which has the minimum value{_POSIX_TRACE_USER_EVENT_MAX}.</p><p>If the Trace Inherit option is not supported, the <i>posix_trace_trid_eventid_open</i>() function shall associate the user traceevent name pointed to by the <i>event_name</i> argument with a trace event type identifier that is unique for the process beingtraced in the trace stream identified by the <i>trid</i> argument, and is returned in the variable pointed to by the <i>event</i>argument. If the user trace event name has already been mapped for the traced process, then the previously assigned trace eventtype identifier shall be returned. If the per-process user trace event name limit represented by {TRACE_USER_EVENT_MAX} has beenreached, the pre-defined POSIX_TRACE_UNNAMED_USEREVENT (see <a href="xsh_chap02_11.html#tagtcjh_7"><i>Trace Option: User TraceEvent</i></a> ) user trace event shall be returned. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p><p><sup>[<a href="javascript:open_code('TEF TRI')">TEF TRI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"border="0"> If the Trace Inherit option is supported, the <i>posix_trace_trid_eventid_open</i>() function shall associate the usertrace event name pointed to by the <i>event_name</i> argument with a trace event type identifier that is unique for all theprocesses being traced in the trace stream identified by the <i>trid</i> argument, and is returned in the variable pointed to bythe <i>event</i> argument. If the user trace event name has already been mapped for the traced processes, then the previouslyassigned 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 <a href="xsh_chap02_11.html#tagtcjh_7"><i>Trace Option: User Trace Event</i></a> ) user trace event shall be returned. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p></blockquote><h4><a name="tag_03_464_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, the <i>posix_trace_eventid_get_name</i>() and <sup>[<a href="javascript:open_code('TEF')">TEF</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"><i>posix_trace_trid_eventid_open</i>() <img src="../images/opt-end.gif" alt="[Option End]" border="0"> functions shall return avalue of zero. Otherwise, they shall return the corresponding error number.</p><p>The <i>posix_trace_eventid_equal</i>() function shall return a non-zero value if <i>event1</i> and <i>event2</i> are equal;otherwise, a value of zero shall be returned. No errors are defined. If either <i>event1</i> or <i>event2</i> are not valid traceevent type identifiers for the trace stream specified by <i>trid</i> or if the <i>trid</i> is invalid, the behavior shall beunspecified.</p><p>The <i>posix_trace_eventid_get_name</i>() function stores the trace event name value in the object pointed to by<i>event_name</i>, if successful.</p><p><sup>[<a href="javascript:open_code('TEF')">TEF</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">The <i>posix_trace_trid_eventid_open</i>() function stores the trace event type identifier value in the object pointed to by<i>event</i>, if successful. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p></blockquote><h4><a name="tag_03_464_05"></a>ERRORS</h4><blockquote><p>The <i>posix_trace_eventid_get_name</i>() and <sup>[<a href="javascript:open_code('TEF')">TEF</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> <i>posix_trace_trid_eventid_open</i>() <img src="../images/opt-end.gif"alt="[Option End]" border="0"> functions shall fail if:</p><dl compact><dt>[EINVAL]</dt><dd>The <i>trid</i> argument was not a valid trace stream identifier.</dd></dl><p><sup>[<a href="javascript:open_code('TEF')">TEF</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">The <i>posix_trace_trid_eventid_open</i>() function shall fail if: <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p><dl compact><dt>[ENAMETOOLONG]</dt><dd><sup>[<a href="javascript:open_code('TEF')">TEF</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"><br>The size of the name pointed to by the <i>event_name</i> argument was longer than the implementation-defined value{TRACE_EVENT_NAME_MAX}. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></dd></dl><p>The <i>posix_trace_eventid_get_name</i>() function shall fail if:</p><dl compact><dt>[EINVAL]</dt><dd>The trace event type identifier <i>event</i> was not associated with any name.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_464_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_464_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_464_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_464_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_464_10"></a>SEE ALSO</h4><blockquote><p><a href="xsh_chap02_11.html#tagtcjh_7"><i>Trace Option: User Trace Event</i></a> , <a href="posix_trace_event.html"><i>posix_trace_event</i>()</a> , <a href="posix_trace_getnext_event.html"><i>posix_trace_getnext_event</i>()</a> , the Base Definitions volume ofIEEE Std 1003.1-2001, <a href="../basedefs/trace.h.html"><i><trace.h></i></a></p></blockquote><h4><a name="tag_03_464_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 6. Derived from IEEE Std 1003.1q-2000.</p><p>IEEE PASC Interpretations 1003.1 #123 and #129 are 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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