devdocs/c/chrono%2Ftimespec.html


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

    <h1 id="firstHeading" class="firstHeading">timespec</h1>            <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;time.h&gt;</code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl t-since-c11"> <td> <pre data-language="c">struct timespec;</pre>
</td> <td class="t-dcl-nopad"> </td> <td> <span class="t-mark-rev t-since-c11">(since C11)</span> </td> </tr>  </table> <p>Structure holding an interval broken down into seconds and nanoseconds.</p>
<h3 id="Member_objects"> Member objects</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <code><a href="time_t" title="c/chrono/time t">time_t</a></code> <code>tv_sec</code> </td> <td> whole seconds (valid values are &gt;= 0) </td>
</tr> <tr class="t-dsc"> <td> <code>/* see below */</code> <code>tv_nsec</code> </td> <td> nanoseconds (valid values are [0, 999999999]) </td>
</tr> </table> <table class="t-rev-begin"> <tr class="t-rev t-until-c23">
<td> <p>The type of <code>tv_nsec</code> is <code>long</code>.</p>
</td> <td><span class="t-mark-rev t-until-c23">(until C23)</span></td>
</tr> <tr class="t-rev t-since-c23">
<td> <p>The type of <code>tv_nsec</code> is an implementation-defined signed integer type that can represent integers in [0, 999999999].</p>
</td> <td><span class="t-mark-rev t-since-c23">(since C23)</span></td>
</tr> </table> <p>The declaration order of <code>tv_sec</code> and <code>tv_nsec</code> is unspecified. Implementation may add other members to <code>struct timespec</code>.</p>
<h3 id="Notes"> Notes</h3> <p>The type of <code>tv_nsec</code> is <code>long long</code> on some platforms, which is conforming only since C23.</p>
<h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include &lt;stdio.h&gt;
#include &lt;time.h&gt;
#include &lt;stdint.h&gt;
 
int main(void)
{
    struct timespec ts;
    timespec_get(&amp;ts, TIME_UTC);
    char buff[100];
    strftime(buff, sizeof buff, "%D %T", gmtime(&amp;ts.tv_sec));
    printf("Current time: %s.%09ld UTC\n", buff, ts.tv_nsec);
    printf("Raw timespec.time_t: %jd\n", (intmax_t)ts.tv_sec);
    printf("Raw timespec.tv_nsec: %09ld\n", ts.tv_nsec);
}</pre></div> <p>Possible output:</p>
<div class="text source-text"><pre data-language="c">Current time: 11/24/21 03:10:50.408191283 UTC
Raw timespec.time_t: 1637723450
Raw timespec.tv_nsec: 408191283</pre></div> </div> <h3 id="References"> References</h3>  <ul>
<li> C17 standard (ISO/IEC 9899:2018): </li>
<ul><li> 7.27.1/3 Components of time (p: 284) </li></ul>
<li> C11 standard (ISO/IEC 9899:2011): </li>
<ul><li> 7.27.1/3 Components of time (p: 388) </li></ul>
</ul>       <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="timespec_get" title="c/chrono/timespec get"> <span class="t-lines"><span>timespec_get</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div> </td> <td> returns the calendar time in seconds and nanoseconds based on a given time base <br> <span class="t-mark">(function)</span>  </td>
</tr> <tr class="t-dsc"> <td> <div><a href="tm" title="c/chrono/tm"> <span class="t-lines"><span>tm</span></span></a></div> </td> <td> calendar time type<br><span class="t-mark">(struct)</span> </td>
</tr> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/chrono/c/timespec" title="cpp/chrono/c/timespec">C++ documentation</a></span> for <code>timespec</code> </td>
</tr> </table>           <div class="_attribution">
  <p class="_attribution-p">
    &copy; cppreference.com<br>Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.<br>
    <a href="https://en.cppreference.com/w/c/chrono/timespec" class="_attribution-link">https://en.cppreference.com/w/c/chrono/timespec</a>
  </p>
</div>