170 lines
8 KiB
HTML
170 lines
8 KiB
HTML
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<title>9p-fid(3) - Plan 9 from User Space</title>
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<meta content="text/html; charset=utf-8" http-equiv=Content-Type>
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<body bgcolor=#ffffff>
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<table border=0 cellpadding=0 cellspacing=0 width=100%>
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<tr height=10><td>
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<tr><td width=20><td>
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<tr><td width=20><td><b>9P-FID(3)</b><td align=right><b>9P-FID(3)</b>
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<tr><td width=20><td colspan=2>
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<br>
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<p><font size=+1><b>NAME </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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Fid, Fidpool, allocfidpool, freefidpool, allocfid, closefid, lookupfid,
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removefid, Req, Reqpool, allocreqpool, freereqpool, allocreq,
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closereq, lookupreq, removereq – 9P fid, request tracking<br>
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</table>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<tt><font size=+1>#include <u.h><br>
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#include <libc.h><br>
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#include <fcall.h><br>
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#include <thread.h><br>
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#include <9p.h><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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typedef struct Fid<br>
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{<br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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ulong fid;<br>
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char omode; /* −1 if not open */<br>
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char *uid;<br>
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Qid qid;<br>
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File *file;<br>
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void *aux;<br>
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</table>
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</font></tt>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<i>...<br>
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</i>
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</table>
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<tt><font size=+1>} Fid;<br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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typedef struct Req<br>
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{<br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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ulong tag;<br>
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Fcall ifcall;<br>
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Fcall ofcall;<br>
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Req *oldreq;<br>
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void *aux;<br>
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</table>
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</font></tt>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<i>...<br>
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</i>
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</table>
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<tt><font size=+1>} Req;<br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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Fidpool* allocfidpool(void (*destroy)(Fid*))<br>
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void freefidpool(Fidpool *p)<br>
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Fid* allocfid(Fidpool *p, ulong fid)<br>
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Fid* lookupfid(Fidpool *p, ulong fid)<br>
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void closefid(Fid *f)<br>
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void removefid(Fid *f)<br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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Reqpool* allocreqpool(void (*destroy)(Req*))<br>
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void freereqpool(Reqpool *p)<br>
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Req* allocreq(Reqpool *p, ulong tag)<br>
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Req* lookupreq(Reqpool *p, ulong tag)<br>
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void closereq(Req *f)<br>
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void removereq(Req *r)<br>
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</font></tt>
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</table>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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These routines provide management of <tt><font size=+1>Fid</font></tt> and <tt><font size=+1>Req</font></tt> structures from
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<tt><font size=+1>Fidpool</font></tt>s and <tt><font size=+1>Reqpool</font></tt>s. They are primarily used by the 9P server
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loop described in <a href="../man3/9p.html"><i>9p</i>(3)</a>.
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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<tt><font size=+1>Fid</font></tt> structures are intended to represent active fids in a 9P connection,
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as <tt><font size=+1>Chan</font></tt> structures do in the Plan 9 kernel. The <tt><font size=+1>fid</font></tt> element is
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the integer fid used in the 9P connection. <tt><font size=+1>Omode</font></tt> is the mode under
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which the fid was opened, or <tt><font size=+1>−1</font></tt> if this fid has not been opened
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yet. Note that in addition to the values <tt><font size=+1>OREAD</font></tt>,
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<tt><font size=+1>OWRITE</font></tt>, and <tt><font size=+1>ORDWR</font></tt>, <tt><font size=+1>omode</font></tt> can contain the various flags permissible
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in an open call. To ignore the flags, use <tt><font size=+1>omode&OMASK</font></tt>. <tt><font size=+1>Omode</font></tt> should
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not be changed by the client. The fid derives from a successful
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authentication by <tt><font size=+1>uid</font></tt>. <tt><font size=+1>Qid</font></tt> contains the qid returned in the last
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successful <tt><font size=+1>walk</font></tt> or <tt><font size=+1>create</font></tt> transaction
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involving the fid. In a file tree-based server, the <tt><font size=+1>Fid</font></tt>’s <tt><font size=+1>file</font></tt>
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element points at a <tt><font size=+1>File</font></tt> structure (see <a href="../man3/9p-file.html"><i>9p-file</i>(3)</a>) corresponding
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to the fid. The <tt><font size=+1>aux</font></tt> member is intended for use by the client to
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hold information specific to a particular <tt><font size=+1>Fid</font></tt>. With the exception
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of <tt><font size=+1>aux</font></tt>, these elements should be treated as read-only by
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the client.
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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<i>Allocfidpool</i> creates a new <tt><font size=+1>Fidpool</font></tt>. <i>Freefidpool</i> destroys such
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a pool. <i>Allocfid</i> returns a new <tt><font size=+1>Fid</font></tt> whose fid number is <i>fid</i>. There
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must not already be an extant <tt><font size=+1>Fid</font></tt> with that number in the pool.
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Once a <tt><font size=+1>Fid</font></tt> has been allocated, it can be looked up by fid number
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using <i>lookupfid</i>. <tt><font size=+1>Fid</font></tt>s are reference counted: both
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<i>allocfid</i> and <i>lookupfid</i> increment the reference count on the <tt><font size=+1>Fid</font></tt>
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structure before returning. When a reference to a <tt><font size=+1>Fid</font></tt> is no longer
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needed, <i>closefid</i> should be called to note the destruction of the
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reference. When the last reference to a <tt><font size=+1>Fid</font></tt> is removed, if <i>destroy</i>
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(supplied when creating the fid pool) is not zero, it is
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called with the <tt><font size=+1>Fid</font></tt> as a parameter. It should perform whatever
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cleanup is necessary regarding the <tt><font size=+1>aux</font></tt> element. <i>Removefid</i> is equivalent
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to <i>closefid</i> but also removes the <tt><font size=+1>Fid</font></tt> from the pool. Note that
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due to lingering references, the return of <i>removefid</i> may not mean
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that <i>destroy</i> has been called.
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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<i>Allocreqpool</i>, <i>freereqpool</i>, <i>allocreq</i>, <i>lookupreq</i>, <i>closereq</i>, and
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<i>removereq</i> are analogous but operate on <tt><font size=+1>Reqpool</font></tt>s and <tt><font size=+1>Req</font></tt> structures.<br>
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</table>
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<p><font size=+1><b>SOURCE </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<tt><font size=+1>/usr/local/plan9/src/lib9p<br>
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</font></tt>
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</table>
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<p><font size=+1><b>SEE ALSO </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<a href="../man3/9p.html"><i>9p</i>(3)</a>, <a href="../man3/9p-file.html"><i>9p-file</i>(3)</a><br>
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</table>
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<td width=20>
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<tr height=20><td>
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</table>
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<!-- TRAILER -->
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<center>
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<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a>
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</center>
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</table>
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