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| author | rsc <devnull@localhost> | 2005-01-14 03:45:44 +0000 |
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| committer | rsc <devnull@localhost> | 2005-01-14 03:45:44 +0000 |
| commit | 78e51a8c6678b6e3dff3d619aa786669f531f4bc (patch) | |
| tree | 015e00fde4fc837fd31b705e18d17dc913829388 /man/man9/stat.html | |
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diff --git a/man/man9/stat.html b/man/man9/stat.html new file mode 100644 index 00000000..eb5c9c4a --- /dev/null +++ b/man/man9/stat.html @@ -0,0 +1,258 @@ +<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 – 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’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’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’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’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’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’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 “don’t touch” 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 “don’t touch” 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, “make the state of + the file exactly what it claims to be.”) + <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 “(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]...,” 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> +<!-- TRAILER --> +<table border=0 cellpadding=0 cellspacing=0 width=100%> +<tr height=15><td width=10><td><td width=10> +<tr><td><td> +<center> +<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a> +</center> +</table> +<!-- TRAILER --> +</body></html> |