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-<head>
-<title>stat(9P) - Plan 9 from User Space</title>
-<meta content="text/html; charset=utf-8" http-equiv=Content-Type>
-</head>
-<body bgcolor=#ffffff>
-<table border=0 cellpadding=0 cellspacing=0 width=100%>
-<tr height=10><td>
-<tr><td width=20><td>
-<tr><td width=20><td><b>STAT(9P)</b><td align=right><b>STAT(9P)</b>
-<tr><td width=20><td colspan=2>
- <br>
-<p><font size=+1><b>NAME </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- stat, wstat &ndash; inquire or change file attributes<br>
-
-</table>
-<p><font size=+1><b>SYNOPSIS </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- <i>size</i>[4] <tt><font size=+1>Tstat</font></tt> <i>tag</i>[2] <i>fid</i>[4]<br>
- <i>size</i>[4] <tt><font size=+1>Rstat</font></tt> <i>tag</i>[2] <i>stat</i>[<i>n</i>]
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- <i>size</i>[4] <tt><font size=+1>Twstat</font></tt> <i>tag</i>[2] <i>fid</i>[4] <i>stat</i>[<i>n</i>]<br>
- <i>size</i>[4] <tt><font size=+1>Rwstat</font></tt> <i>tag</i>[2]<br>
-
-</table>
-<p><font size=+1><b>DESCRIPTION </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- The <tt><font size=+1>stat</font></tt> transaction inquires about the file identified by <i>fid</i>.
- The reply will contain a machine-independent <i>directory entry</i>,
- <i>stat</i>, laid out as follows:<br>
- <i>size</i>[2]total byte count of the following data<br>
- <i>type</i>[2]<br>
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- for kernel use<br>
-
- </table>
- <i>dev</i>[4]for kernel use<br>
- <i>qid.type</i>[1]<br>
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- the type of the file (directory, etc.), represented as a bit vector
- corresponding to the high 8 bits of the file&#8217;s mode word.<br>
-
- </table>
- <i>qid.vers</i>[4]<br>
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- version number for given path<br>
-
- </table>
- <i>qid.path</i>[8]<br>
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- the file server&#8217;s unique identification for the file<br>
-
- </table>
- <i>mode</i>[4]<br>
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- permissions and flags<br>
-
- </table>
- <i>atime</i>[4]<br>
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- last access time<br>
-
- </table>
- <i>mtime</i>[4]<br>
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- last modification time<br>
-
- </table>
- <i>length</i>[8]<br>
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- length of file in bytes<br>
-
- </table>
- <i>name</i>[ s ]<br>
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- file name; must be <tt><font size=+1>/</font></tt> if the file is the root directory of the
- server<br>
-
- </table>
- <i>uid</i>[ s ]<br>
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- owner name<br>
-
- </table>
- <i>gid</i>[ s ]<br>
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- group name<br>
-
- </table>
- <i>muid</i>[ s ]<br>
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- name of the user who last modified the file
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
-
- </table>
- Integers in this encoding are in little-endian order (least significant
- byte first). The <i>convM2D</i> and <i>convD2M</i> routines (see <a href="../man3/fcall.html"><i>fcall</i>(3)</a>) convert
- between directory entries and a C structure called a <tt><font size=+1>Dir</font></tt>.
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- The <i>mode</i> contains permission bits as described in <i>intro</i>(9P) and
- the following: <tt><font size=+1>0x80000000</font></tt> (<tt><font size=+1>DMDIR</font></tt>, this file is a directory), <tt><font size=+1>0x40000000</font></tt>
- (<tt><font size=+1>DMAPPEND</font></tt>, append only), <tt><font size=+1>0x20000000</font></tt> (<tt><font size=+1>DMEXCL</font></tt>, exclusive use), <tt><font size=+1>0x04000000</font></tt>
- (<tt><font size=+1>DMTMP</font></tt>, temporary); these are echoed in <tt><font size=+1>Qid.type</font></tt>. Writes to append-only
- files always
- place their data at the end of the file; the <i>offset</i> in the <tt><font size=+1>write</font></tt>
- message is ignored, as is the <tt><font size=+1>OTRUNC</font></tt> bit in an open. Exclusive
- use files may be open for I/O by only one fid at a time across
- all clients of the server. If a second open is attempted, it draws
- an error. Servers may implement a timeout on the lock on an
- exclusive use file: if the fid holding the file open has been
- unused for an extended period (of order at least minutes), it
- is reasonable to break the lock and deny the initial fid further
- I/O. Temporary files are not included in nightly archives (see
- Plan 9&#8217;s <i>fossil</i>(4)).
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- The two time fields are measured in seconds since the epoch (Jan
- 1 00:00 1970 GMT). The <i>mtime</i> field reflects the time of the last
- change of content (except when later changed by <tt><font size=+1>wstat</font></tt>). For a
- plain file, <i>mtime</i> is the time of the most recent <tt><font size=+1>create</font></tt>, <tt><font size=+1>open</font></tt>
- with truncation, or <tt><font size=+1>write</font></tt>; for a directory it is the time of
- the most recent <tt><font size=+1>remove</font></tt>, <tt><font size=+1>create</font></tt>, or <tt><font size=+1>wstat</font></tt> of a file in the directory.
- Similarly, the <i>atime</i> field records the last <tt><font size=+1>read</font></tt> of the contents;
- also it is set whenever <i>mtime</i> is set. In addition, for a directory,
- it is set by an <tt><font size=+1>attach</font></tt>, <tt><font size=+1>walk</font></tt>, or <tt><font size=+1>create</font></tt>, all whether successful
- or not.
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- The <i>muid</i> field names the user whose actions most recently changed
- the <i>mtime</i> of the file.
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- The <i>length</i> records the number of bytes in the file. Directories
- and most files representing devices have a conventional length
- of 0.
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- The <tt><font size=+1>stat</font></tt> request requires no special permissions.
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- The <tt><font size=+1>wstat</font></tt> request can change some of the file status information.
- The <i>name</i> can be changed by anyone with write permission in the
- parent directory; it is an error to change the name to that of
- an existing file. The <i>length</i> can be changed (affecting the actual
- length of the file) by anyone with write permission on the
- file. It is an error to attempt to set the length of a directory
- to a non-zero value, and servers may decide to reject length changes
- for other reasons. The <i>mode</i> and <i>mtime</i> can be changed by the owner
- of the file or the group leader of the file&#8217;s current group. The
- directory bit cannot be changed by a <tt><font size=+1>wstat</font></tt>; the other
- defined permission and mode bits can. The <i>gid</i> can be changed:
- by the owner if also a member of the new group; or by the group
- leader of the file&#8217;s current group if also leader of the new group
- (see <i>intro</i>(9P) for more information about permissions, users,
- and groups). None of the other data can be altered by a
- <tt><font size=+1>wstat</font></tt> and attempts to change them will trigger an error. In particular,
- it is illegal to attempt to change the owner of a file. (These
- conditions may be relaxed when establishing the initial state
- of a file server; see Plan 9&#8217;s <i>fsconfig</i>(8).)
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- Either all the changes in <tt><font size=+1>wstat</font></tt> request happen, or none of them
- does: if the request succeeds, all changes were made; if it fails,
- none were.
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- A <tt><font size=+1>wstat</font></tt> request can avoid modifying some properties of the file
- by providing explicit &#8220;don&#8217;t touch&#8221; values in the <tt><font size=+1>stat</font></tt> data that
- is sent: zero-length strings for text values and the maximum unsigned
- value of appropriate size for integral values. As a special case,
- if <i>all</i> the elements of the directory entry in a <tt><font size=+1>Twstat
- </font></tt>message are &#8220;don&#8217;t touch&#8221; values, the server may interpret it
- as a request to guarantee that the contents of the associated
- file are committed to stable storage before the <tt><font size=+1>Rwstat</font></tt> message
- is returned. (Consider the message to mean, &#8220;make the state of
- the file exactly what it claims to be.&#8221;)
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- A <i>read</i> of a directory yields an integral number of directory entries
- in the machine independent encoding given above (see <i>read</i>(9P)).
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- Note that since the <tt><font size=+1>stat</font></tt> information is sent as a 9P variable-length
- datum, it is limited to a maximum of 65535 bytes.<br>
-
-</table>
-<p><font size=+1><b>ENTRY POINTS </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- <tt><font size=+1>Stat</font></tt> messages are generated by <i>fsdirfstat</i> and <i>fsdirstat</i> (see <a href="../man3/9pclient.html"><i>9pclient</i>(3)</a>).
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- <tt><font size=+1>Wstat</font></tt> messages are generated by <i>fsdirfwstat</i> and <i>fsdirwstat</i>.<br>
-
-</table>
-<p><font size=+1><b>BUGS </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- To make the contents of a directory, such as returned by <i>read</i>(9P),
- easy to parse, each directory entry begins with a size field.
- For consistency, the entries in <tt><font size=+1>Twstat</font></tt> and <tt><font size=+1>Rstat</font></tt> messages also
- contain their size, which means the size appears twice. For example,
- the <tt><font size=+1>Rstat</font></tt> message is formatted as &#8220;(4+1+2+2+<i>n</i>)[4]
- <tt><font size=+1>Rstat</font></tt> <i>tag</i>[2] <i>n</i>[2] (<i>n</i>-2)[2] <i>type</i>[2] <i>dev</i>[4]...,&#8221; where <i>n</i> is the
- value returned by <tt><font size=+1>convD2M</font></tt>.<br>
-
-</table>
-
-<td width=20>
-<tr height=20><td>
-</table>
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