314 lines
7.9 KiB
HTML
314 lines
7.9 KiB
HTML
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<title>Qp0zCvtToTimeval()-Convert _MI_Time to Timeval Structure</title>
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<a name="Top_Of_Page"></a>
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<h2>Qp0zCvtToTimeval()-Convert _MI_Time to Timeval Structure</h2>
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<div class="box" style="width: 80%;">
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<br>
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Syntax:<br>
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<pre>
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#include <qp0z1170.h>
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int Qp0zCvtToTimeval (struct timeval *<em>to</em>,
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const _MI_Time <strong>from</strong>,
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int <strong>option</strong>);
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</pre>
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<br>
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Service Program Name: QP0ZCPA<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: Yes<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <strong>Qp0zCvtToTimeval()</strong> function converts a machine
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timestamp (or a machine timestamp offset), represented by an _MI_Time data
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type, to a corresponding structure timeval value. The job's time zone offset from UTC
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and epoch-1970 are optionally taken into account by this conversion. Only
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timestamps or timestamp offsets in the following ranges can be converted:</p>
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<ul>
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<li>Timestamps that are later than or equal to 1 January 1970, 00:00:00 UTC
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(epoch-1970) and less than 19 January 2038, 03:14:08 UTC.</li>
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<li>Timestamp offsets that are greater than or equal to 0 and less than 2,147,483,648
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seconds.</li>
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</ul>
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<p><strong>Note:</strong> This function uses a header (include) file from the
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library QSYSINC, which is optionally installable. Make sure QSYSINC is
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installed on your system before using this function. See <a href="unix13.htm">
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Header Files for UNIX-Type Functions</a>) for the file and member name of each
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header file.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>to</strong></dt>
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<dd>(Output) The address of the timeval structure to contain the converted
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timestamp (or timestamp offset).<br>
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<br>
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</dd>
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<dt><strong>from</strong></dt>
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<dd>(Input) The _MI_Time data type to be converted.<br>
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<br>
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</dd>
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<dt><strong>option</strong></dt>
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<dd>(Input) The conversion option.</dd>
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</dl>
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<br>
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<p>The <strong>option</strong> parameter must be one of the following
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constants:</p>
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<dl>
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<dt><strong>QP0Z_CVTTIME_TO_OFFSET</strong></dt>
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<dd>Do the conversion as a timestamp offset, not factoring in the UTC offset
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from the current time zone of the job or epoch-1970.<br>
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<br>
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</dd>
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<dt><strong>QP0Z_CVTTIME_TO_TIMESTAMP</strong></dt>
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<dd>Do the conversion as a timestamp, factoring in the UTC offset from the
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current time zone of the job and epoch-1970.<br>
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<br>
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</dd>
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<dt><strong>QP0Z_CVTTIME_FACTOR_EPOCH_ONLY</strong></dt>
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<dd>Do the conversion as a timestamp, but factor in epoch-1970 only.<br>
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<br>
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</dd>
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<dt><strong>QP0Z_CVTTIME_FACTOR_UTCOFFSET_ONLY</strong></dt>
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<dd>Do the conversion as a timestamp, but factor in the UTC offset from
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the current time zone of the job only.</dd>
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</dl>
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<br>
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<h3>Authorities and Locks</h3>
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<p>None.</p>
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<br>
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<h3>Return Value</h3>
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<table cellpadding="5">
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<!-- cols="15 85" -->
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<tr>
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<td align="left" valign="top"><em>0</em></td>
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<td align="left" valign="top"><strong>Qp0zCvtToTimeval()</strong> was
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successful. The value referenced by the <strong>to</strong> parameter is the
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converted timestamp (or timestamp offset).</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>-1</em></td>
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<td align="left" valign="top"><strong>Qp0zCvtToTimeval()</strong> was not
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successful. The <em>errno</em> variable is set to indicate the error.</td>
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</tr>
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</table>
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<br>
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<br>
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<h3>Error Conditions</h3>
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<p>If <strong>Qp0zCvtToTimeval()</strong> is not successful, <em>errno</em>
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usually indicates one of the following errors. Under some conditions, <em>
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errno</em> could indicate an error other than those listed here.</p>
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<dl>
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<dt><em>[EINVAL]</em></dt>
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<dd>The value specified for the argument is not correct.
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<p>A function was passed incorrect argument values, or an operation was
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attempted on an object and the operation specified is not supported for that
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type of object.</p>
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<p>An argument value is not valid, out of range, or NULL.</p>
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</dd>
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<dt><em>[EFAULT]</em></dt>
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<dd>The address used for an argument is not correct.
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<p>In attempting to use an argument in a call, the system detected an address
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that is not valid.</p>
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<p>While attempting to access a parameter passed to this function, the system
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detected an address that is not valid.</p>
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</dd>
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<dt><em>[ERANGE]</em></dt>
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<dd>A range error occurred.
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<p>The value of an argument is too small, or a result too large.</p>
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</dd>
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<dt><em>[EUNKNOWN]</em></dt>
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<dd>Unknown system state.
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<p>The operation failed because of an unknown system state. See any messages in
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the job log and correct any errors that are indicated, then retry the
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operation.</p>
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</dd>
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</dl>
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<br>
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<h3>Error Messages</h3>
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<p>None.</p>
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<br>
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<h3>Usage Notes</h3>
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<ol type="1">
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<li><strong>Qp0zCvtToTimeval()</strong>, when called with <strong>
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option</strong> equal to QP0Z_CVTTIME_TO_OFFSET, will convert the machine
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timestamp offset given in the <strong>from</strong> parameter to an equivalent
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number of seconds and microseconds. This could be used to calculate a time
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delay.</li>
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<li><strong>Qp0zCvtToTimeval()</strong>, when called with <strong>
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option</strong> equal to QP0Z_CVTTIME_TO_TIMESTAMP, will convert the machine
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timestamp given in the <strong>from</strong> parameter to an equivalent number
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of seconds and microseconds. This could be used as a UNIX-type timestamp.</li>
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</ol>
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<br>
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<h3>Related Information</h3>
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<ul>
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<li>The <<strong>qp0z1170.h</strong>> file (see <a href="unix13.htm">
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Header Files for UNIX-Type Functions</a>)</li>
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<li><a href="cvttomit.htm">Qp0zCvtToMITime() - Convert Timeval Structure
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to_MI_Time</a></li>
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</ul>
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<br>
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<h3>Example</h3>
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<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
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for information pertaining to code examples.</p>
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<p>The following example converts a timestamp:</p>
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<pre>
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#include <qp0z1170.h>
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#include <mimchint.h>
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#include <stdio.h>
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#include <errno.h>
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int main(int argc, char *argv[])
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{
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_MI_Time mt;
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struct timeval tv;
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int rc;
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mattod(mt);
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printf("mi timestamp: %08X%08X\n",
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*((unsigned *)&mt[0]),
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*((unsigned *)&mt[4]));
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rc = Qp0zCvtToTimeval(&tv, mt, QP0Z_CVTTIME_TO_TIMESTAMP);
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if(rc==0) {
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printf("timeval timestamp: %u.%06u\n",
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tv.tv_sec, tv.tv_usec);
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}
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else {
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printf("Qp0zCvtToTimeval() failed, errno = %d\n",
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errno);
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return -1;
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}
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return 0;
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}
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</pre>
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<strong>Example Output:</strong>
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<pre>
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mi timestamp: 7B7E9425EAC00000
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timeval timestamp: 867422292.052992
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</pre>
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<br>
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<hr>
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API introduced: V4R2
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
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"misc1.htm">Miscellaneous APIs</a> | <a href="aplist.htm">APIs by
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category</a></td>
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</tr>
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</table>
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</center>
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</body>
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