185 lines
7.2 KiB
HTML
185 lines
7.2 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>posix_trace_close</title>
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<basefont size="3"> <a name="posix_trace_close"></a> <a name="tag_03_461"></a><!-- posix_trace_close -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_461_01"></a>NAME</h4>
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<blockquote>posix_trace_close, posix_trace_open, posix_trace_rewind - trace log management (<b>TRACING</b>)</blockquote>
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<h4><a name="tag_03_461_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('TRC TRL')">TRC TRL</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/trace.h.html">trace.h</a>><br>
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<br>
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int posix_trace_close(trace_id_t</tt> <i>trid</i><tt>);<br>
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int posix_trace_open(int</tt> <i>file_desc</i><tt>, trace_id_t *</tt><i>trid</i><tt>);<br>
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int posix_trace_rewind(trace_id_t</tt> <i>trid</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border=
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"0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_461_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>posix_trace_close</i>() function shall deallocate the trace log identifier indicated by <i>trid</i>, and all of its
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associated resources. If there is no valid trace log pointed to by the <i>trid</i>, this function shall fail.</p>
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<p>The <i>posix_trace_open</i>() function shall allocate the necessary resources and establish the connection between a trace log
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identified by the <i>file_desc</i> argument and a trace stream identifier identified by the object pointed to by the <i>trid</i>
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argument. The <i>file_desc</i> argument should be a valid open file descriptor that corresponds to a trace log. The
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<i>file_desc</i> argument shall be open for reading. The current trace event timestamp, which specifies the timestamp of the trace
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event that will be read by the next call to <a href=
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"../functions/posix_trace_getnext_event.html"><i>posix_trace_getnext_event</i>()</a>, shall be set to the timestamp of the oldest
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trace event recorded in the trace log identified by <i>trid</i>.</p>
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<p>The <i>posix_trace_open</i>() function shall return a trace stream identifier in the variable pointed to by the <i>trid</i>
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argument, that may only be used by the following functions:</p>
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<table cellpadding="3">
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<tr valign="top">
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<td align="left">
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<p class="tent"><br>
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<i>posix_trace_close</i>()<br>
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<a href="../functions/posix_trace_eventid_equal.html"><i>posix_trace_eventid_equal</i>()</a><br>
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<a href="../functions/posix_trace_eventid_get_name.html"><i>posix_trace_eventid_get_name</i>()</a><br>
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<a href="../functions/posix_trace_eventtypelist_getnext_id.html"><i>posix_trace_eventtypelist_getnext_id</i>()</a><br>
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<a href="../functions/posix_trace_eventtypelist_rewind.html"><i>posix_trace_eventtypelist_rewind</i>()</a><br>
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</p>
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</td>
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<td align="left">
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<p class="tent"><br>
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<a href="../functions/posix_trace_get_attr.html"><i>posix_trace_get_attr</i>()</a><br>
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<a href="../functions/posix_trace_get_status.html"><i>posix_trace_get_status</i>()</a><br>
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<a href="../functions/posix_trace_getnext_event.html"><i>posix_trace_getnext_event</i>()</a><br>
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<i>posix_trace_rewind</i>()<br>
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</p>
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</td>
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</tr>
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</table>
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<p>In particular, notice that the operations normally used by a trace controller process, such as <a href=
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"../functions/posix_trace_start.html"><i>posix_trace_start</i>()</a>, <a href=
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"../functions/posix_trace_stop.html"><i>posix_trace_stop</i>()</a>, or <a href=
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"../functions/posix_trace_shutdown.html"><i>posix_trace_shutdown</i>()</a>, cannot be invoked using the trace stream identifier
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returned by the <i>posix_trace_open</i>() function.</p>
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<p>The <i>posix_trace_rewind</i>() function shall reset the current trace event timestamp, which specifies the timestamp of the
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trace event that will be read by the next call to <a href=
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"../functions/posix_trace_getnext_event.html"><i>posix_trace_getnext_event</i>()</a>, to the timestamp of the oldest trace event
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recorded in the trace log identified by <i>trid</i>.</p>
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</blockquote>
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<h4><a name="tag_03_461_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, these functions shall return a value of zero. Otherwise, they shall return the corresponding error
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number.</p>
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<p>If successful, the <i>posix_trace_open</i>() function stores the trace stream identifier value in the object pointed to by
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<i>trid</i>.</p>
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</blockquote>
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<h4><a name="tag_03_461_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>posix_trace_open</i>() function shall fail if:</p>
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<dl compact>
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<dt>[EINTR]</dt>
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<dd>The operation was interrupted by a signal and thus no trace log was opened.</dd>
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<dt>[EINVAL]</dt>
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<dd>The object pointed to by <i>file_desc</i> does not correspond to a valid trace log.</dd>
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</dl>
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<p>The <i>posix_trace_close</i>() and <i>posix_trace_rewind</i>() functions may fail if:</p>
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<dl compact>
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<dt>[EINVAL]</dt>
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<dd>The object pointed to by <i>trid</i> does not correspond to a valid trace log.</dd>
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</dl>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_461_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_461_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_461_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_461_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_461_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="posix_trace_get_attr.html"><i>posix_trace_get_attr</i>()</a> , <a href=
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"posix_trace_get_filter.html"><i>posix_trace_get_filter</i>()</a> , <a href=
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"posix_trace_getnext_event.html"><i>posix_trace_getnext_event</i>()</a> , the Base Definitions volume of
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IEEE Std 1003.1-2001, <a href="../basedefs/trace.h.html"><i><trace.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_461_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 6. Derived from IEEE Std 1003.1q-2000.</p>
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<p>IEEE PASC Interpretation 1003.1 #123 is applied.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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