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Hi, <br>
<br>
 Can I have your review for this small changes?<br>
 <a href="http://cr.openjdk.java.net/%7Eminqi/7164841/webrev00/">http://cr.openjdk.java.net/~minqi/7164841/webrev00/</a><br>
<br>
  This is for a enhancement to add head/tail message to the logging
files to assist reading GC output.<br>
  1. modified prompt message if invalid arguments used for log
rotating;<br>
  2. add time and file name message to log file head/tail.<br>
  3. for easily identify which log file is current, use file name
like <filename>.n.current, after it reaches maximum size,
rename it to <filename>.n<br>
       On Windows, there is no F_OK (existing test) definition,
F_OK is defined as "0" and for _access of VC++, it just describes:<br>
        <br>
<table style="border-collapse: collapse; padding: 0px; width:
1306px; border: 1px solid rgb(187, 187, 187); color: rgb(0, 0, 0);
font-family: 'Segoe UI', 'Lucida Grande', Verdana, Arial,
Helvetica, sans-serif; font-size: 13px; font-style: normal;
font-variant: normal; font-weight: normal; letter-spacing: normal;
line-height: 17px; orphans: auto; text-align: start; text-indent:
0px; text-transform: none; white-space: normal; widows: auto;
word-spacing: 0px; -webkit-text-stroke-width: 0px;">
<tbody>
<tr>
<th style="border: 1px solid rgb(187, 187, 187); margin: 10px;
padding: 10px 8px; background-color: rgb(237, 237, 237);
color: rgb(112, 112, 112); text-align: left;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px; line-height:
18px;"><span class="parameter" style="font-style: italic;">mode</span><span
class="Apple-converted-space">Â </span>value</p>
</th>
<th style="border: 1px solid rgb(187, 187, 187); margin: 10px;
padding: 10px 8px; background-color: rgb(237, 237, 237);
color: rgb(112, 112, 112); text-align: left;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px; line-height:
18px;">Checks file for</p>
</th>
</tr>
<tr>
<td style="border: 1px solid rgb(187, 187, 187); margin: 10px;
padding: 10px 8px; color: rgb(42, 42, 42); vertical-align:
top;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px; line-height:
18px;">00</p>
</td>
<td style="border: 1px solid rgb(187, 187, 187); margin: 10px;
padding: 10px 8px; color: rgb(42, 42, 42); vertical-align:
top;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px; line-height:
18px;">Existence only</p>
</td>
</tr>
<tr>
<td style="border: 1px solid rgb(187, 187, 187); margin: 10px;
padding: 10px 8px; color: rgb(42, 42, 42); vertical-align:
top;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px; line-height:
18px;">02</p>
</td>
<td style="border: 1px solid rgb(187, 187, 187); margin: 10px;
padding: 10px 8px; color: rgb(42, 42, 42); vertical-align:
top;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px; line-height:
18px;">Write-only</p>
</td>
</tr>
<tr>
<td style="border: 1px solid rgb(187, 187, 187); margin: 10px;
padding: 10px 8px; color: rgb(42, 42, 42); vertical-align:
top;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px; line-height:
18px;">04</p>
</td>
<td style="border: 1px solid rgb(187, 187, 187); margin: 10px;
padding: 10px 8px; color: rgb(42, 42, 42); vertical-align:
top;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px; line-height:
18px;">Read-only</p>
</td>
</tr>
<tr>
<td style="border: 1px solid rgb(187, 187, 187); margin: 10px;
padding: 10px 8px; color: rgb(42, 42, 42); vertical-align:
top;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px; line-height:
18px;">06</p>
</td>
<td style="border: 1px solid rgb(187, 187, 187); margin: 10px;
padding: 10px 8px; color: rgb(42, 42, 42); vertical-align:
top;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px; line-height:
18px;">Read and write</p>
</td>
</tr>
</tbody>
</table>
<br>
<a href="http://msdn.microsoft.com/en-us/library/1w06ktdy.aspx">http://msdn.microsoft.com/en-us/library/1w06ktdy.aspx</a><br>
The definition are consistent with unistd.h. Â Â Â Â Â <br>
<br>
   Test: JPRT and jtreg.<br>
<br>
  Thanks<br>
  Yumin<br>
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