xnu-344.tar.gz

[apple/xnu.git] / osfmk / man / tvalspec.html

<h2>tvalspec</h2>
<hr>
<p>
<strong>Structure</strong> - Defines format of system time values.
<h3>SYNOPSIS</h3>
<pre>
<strong>struct tvalspec</strong>
<strong>{</strong>
       <strong>unsigned int</strong>       <var>tv_sec</var><strong>;</strong>
       <strong>clock_res_t</strong>       <var>tv_nsec</var><strong>;</strong>
<strong>};</strong>

<strong>typedef struct tvalspec tvalspec_t;</strong>
</pre>
<h3>FIELDS</h3>
<dl>
<dt> <var>tv_sec</var>
<dd>
Seconds.
<p>
<dt> <var>tv_nsec</var>
<dd>
Nanoseconds.
</dl>
<h3>DESCRIPTION</h3>
<p>
The <strong>tvalspec</strong> structure defines the format of the time
structure supplied to or
returned from the kernel.  This definition conforms to the Posix
1003.4 <var>timespec</var> 
definition where the <var>tv_nsec</var> structure member is valid
if (0 =< <var>tv_nsec</var> < 109) and 
the time period described is ((<var>tv_sec</var> * 109) + <var>tv_nsec</var>) nanoseconds.
<h3>RELATED INFORMATION</h3>
<p>
Functions:
<a href="clock_get_time.html"><strong>clock_get_time</strong></a>,
<a href="clock_set_time.html"><strong>clock_set_time</strong></a>,
<a href="clock_sleep.html"><strong>clock_sleep</strong></a>,
<a href="clock_alarm.html"><strong>clock_alarm</strong></a>,
<a href="clock_alarm_reply.html"><strong>clock_alarm_reply</strong></a>.
<p>
Data Structures:
<a href="mapped_tvalspec.html"><strong>mapped_tvalspec</strong></a>.