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<h1>contrib/openisis/lio.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> openisis - an open implementation of the CDS/ISIS database</span>
<a name="l00003"></a>00003 <span class="comment"> Version 0.8.x (patchlevel see file Version)</span>
<a name="l00004"></a>00004 <span class="comment"> Copyright (C) 2001-2003 by Erik Grziwotz, erik@openisis.org</span>
<a name="l00005"></a>00005 <span class="comment"></span>
<a name="l00006"></a>00006 <span class="comment"> This library is free software; you can redistribute it and/or</span>
<a name="l00007"></a>00007 <span class="comment"> modify it under the terms of the GNU Lesser General Public</span>
<a name="l00008"></a>00008 <span class="comment"> License as published by the Free Software Foundation; either</span>
<a name="l00009"></a>00009 <span class="comment"> version 2.1 of the License, or (at your option) any later version.</span>
<a name="l00010"></a>00010 <span class="comment"></span>
<a name="l00011"></a>00011 <span class="comment"> This library is distributed in the hope that it will be useful,</span>
<a name="l00012"></a>00012 <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00013"></a>00013 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00014"></a>00014 <span class="comment"> Lesser General Public License for more details.</span>
<a name="l00015"></a>00015 <span class="comment"></span>
<a name="l00016"></a>00016 <span class="comment"> You should have received a copy of the GNU Lesser General Public</span>
<a name="l00017"></a>00017 <span class="comment"> License along with this library; if not, write to the Free Software</span>
<a name="l00018"></a>00018 <span class="comment"> Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span>
<a name="l00019"></a>00019 <span class="comment"></span>
<a name="l00020"></a>00020 <span class="comment"> see README for more information</span>
<a name="l00021"></a>00021 <span class="comment">EOH */</span>
<a name="l00022"></a>00022 <span class="preprocessor">#ifndef LIO_H</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span>
<a name="l00024"></a>00024 <span class="comment">/*</span>
<a name="l00025"></a>00025 <span class="comment"> $Id: lio.h,v 1.22 2003/05/29 18:02:54 kripke Exp $</span>
<a name="l00026"></a>00026 <span class="comment"> I/O support for the openisis library.</span>
<a name="l00027"></a>00027 <span class="comment"> Provides non-blocking, look-ahead network streams and other nice stuff.</span>
<a name="l00028"></a>00028 <span class="comment">*/</span>
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="preprocessor">#include "luti.h"</span>
<a name="l00031"></a>00031 <span class="preprocessor">#include "lll.h"</span>
<a name="l00032"></a>00032
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="comment">/* ************************************************************</span>
<a name="l00035"></a>00035 <span class="comment"> time</span>
<a name="l00036"></a>00036 <span class="comment">*/</span>
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="comment">/* struct wrapper just for struct Tm *Time */</span>
<a name="l00039"></a><a class="code" href="structTm.html">00039</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structTm.html">Tm</a> {
<a name="l00040"></a>00040 lll millis;
<a name="l00041"></a>00041 } <a class="code" href="structTm.html">Tm</a>;
<a name="l00042"></a>00042
<a name="l00046"></a>00046 <span class="keyword">extern</span> <span class="keywordtype">int</span> timeUpd ( <a class="code" href="structTm.html">Tm</a> * );
<a name="l00053"></a>00053 <span class="keyword">extern</span> <span class="keywordtype">char</span> *timeGtf ( <span class="keywordtype">char</span> *buf, <a class="code" href="structTm.html">Tm</a> * );
<a name="l00058"></a>00058 <span class="keyword">extern</span> <span class="keywordtype">char</span> *timeGtfm ( <span class="keywordtype">char</span> *buf, <a class="code" href="structTm.html">Tm</a> * );
<a name="l00062"></a>00062 <span class="keyword">extern</span> <span class="keywordtype">void</span> timeSleep ( <a class="code" href="structTm.html">Tm</a> * );
<a name="l00063"></a>00063
<a name="l00064"></a>00064
<a name="l00065"></a>00065 <span class="comment">/* ************************************************************</span>
<a name="l00066"></a>00066 <span class="comment"> system files</span>
<a name="l00067"></a>00067 <span class="comment">*/</span>
<a name="l00068"></a>00068
<a name="l00076"></a>00076 <span class="preprocessor">#define LIO_WANT 0xfff00000 </span><span class="comment">/* what we want: open flags */</span>
<a name="l00077"></a>00077 <span class="preprocessor">#define LIO_FD 0x0000ffff </span><span class="comment">/* what we get: system fd */</span>
<a name="l00078"></a>00078 <span class="preprocessor">#define LIO_STAT 0x000f0000 </span><span class="comment">/* how it's going: it's status */</span>
<a name="l00079"></a>00079
<a name="l00080"></a>00080 <span class="comment">/* status flags */</span>
<a name="l00081"></a>00081 <span class="preprocessor">#define LIO_IN 0x00010000 </span><span class="comment">/* support input */</span>
<a name="l00082"></a>00082 <span class="preprocessor">#define LIO_OUT 0x00020000 </span><span class="comment">/* support output */</span>
<a name="l00083"></a>00083 <span class="preprocessor">#define LIO_INOUT 0x00030000 </span><span class="comment">/* support both */</span>
<a name="l00084"></a>00084 <span class="preprocessor">#define LIO_ISOPEN( file ) (LIO_INOUT & (file))</span>
<a name="l00085"></a>00085 <span class="preprocessor"></span>
<a name="l00086"></a>00086 <span class="comment">/* common requirements that are also used by non-system streams. */</span>
<a name="l00087"></a>00087 <span class="preprocessor">#define LIO_RD 0x00100000 </span><span class="comment">/* shall be opened for input */</span>
<a name="l00088"></a>00088 <span class="preprocessor">#define LIO_WR 0x00200000 </span><span class="comment">/* shall be opened for output */</span>
<a name="l00089"></a>00089 <span class="preprocessor">#define LIO_RDWR 0x00300000 </span><span class="comment">/* shall be opened for both */</span>
<a name="l00090"></a>00090 <span class="preprocessor">#define LIO_SYNC 0x00400000 </span><span class="comment">/* with WR: syncing output */</span>
<a name="l00091"></a>00091 <span class="preprocessor">#define LIO_NBLK 0x00800000 </span><span class="comment">/* non blocking IO (not used) */</span>
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="comment">/* system files only. */</span>
<a name="l00094"></a>00094 <span class="preprocessor">#define LIO_CREAT 0x01000000 </span><span class="comment">/* with WR: shall be created */</span>
<a name="l00095"></a>00095 <span class="preprocessor">#define LIO_TRY 0x01000000 </span><span class="comment">/* w/o WR: do not complain if open fails */</span>
<a name="l00096"></a>00096 <span class="preprocessor">#define LIO_TRUNC 0x02000000 </span><span class="comment">/* with WR: shall be truncated */</span>
<a name="l00097"></a>00097 <span class="preprocessor">#define LIO_SEEK 0x04000000 </span><span class="comment">/* random access (with WR: else append mode) */</span>
<a name="l00098"></a>00098 <span class="preprocessor">#define LIO_SOCK 0x08000000 </span><span class="comment">/* is a socket (support shutdown) */</span>
<a name="l00099"></a>00099
<a name="l00100"></a>00100 <span class="comment">/* locking */</span>
<a name="l00101"></a>00101 <span class="preprocessor">#define LIO_TLOCK 0x10000000 </span><span class="comment">/* try locking (EX with WR) */</span>
<a name="l00102"></a>00102 <span class="preprocessor">#define LIO_WLOCK 0x20000000 </span><span class="comment">/* lock waiting (EX with WR) */</span>
<a name="l00103"></a>00103 <span class="preprocessor">#define LIO_FLOCK 0x30000000 </span><span class="comment">/* any locking is set */</span>
<a name="l00104"></a>00104
<a name="l00105"></a>00105
<a name="l00110"></a>00110 <span class="keyword">extern</span> <span class="keywordtype">int</span> lio_open ( <span class="keyword">const</span> <span class="keywordtype">char</span> *name, <span class="keywordtype">int</span> flags );
<a name="l00111"></a>00111 <span class="keyword">extern</span> <span class="keywordtype">int</span> lio_close ( <span class="keywordtype">int</span> *file, <span class="keywordtype">int</span> flags );
<a name="l00112"></a>00112 <span class="keyword">extern</span> <span class="keywordtype">int</span> lio_size ( <span class="keywordtype">int</span> file );
<a name="l00113"></a>00113 <span class="keyword">extern</span> <span class="keywordtype">unsigned</span> lio_time ( <span class="keywordtype">int</span> file ); <span class="comment">/* mtime sec */</span>
<a name="l00114"></a>00114
<a name="l00115"></a>00115 <span class="keyword">extern</span> <span class="keywordtype">int</span> lio_in;
<a name="l00116"></a>00116 <span class="keyword">extern</span> <span class="keywordtype">int</span> lio_out;
<a name="l00117"></a>00117 <span class="keyword">extern</span> <span class="keywordtype">int</span> lio_err;
<a name="l00118"></a>00118
<a name="l00119"></a>00119
<a name="l00120"></a>00120 <span class="comment">/*</span>
<a name="l00121"></a>00121 <span class="comment"> Like the syscalls, this returns the number of bytes on success.</span>
<a name="l00122"></a>00122 <span class="comment"> Unlike the syscalls, it returns 0 rather than an error</span>
<a name="l00123"></a>00123 <span class="comment"> when no bytes are available after interrupt (EINTR)</span>
<a name="l00124"></a>00124 <span class="comment"> or on non-blocking IO (EAGAIN); i.e. you may try later.</span>
<a name="l00125"></a>00125 <span class="comment"> On error, a negative value is returned.</span>
<a name="l00126"></a>00126 <span class="comment"> On errors that render the file unusable,</span>
<a name="l00127"></a>00127 <span class="comment"> it is closed for input or output, resp.</span>
<a name="l00128"></a>00128 <span class="comment"> These are most errors but EFAULT (bad buf)</span>
<a name="l00129"></a>00129 <span class="comment"> and ESPIPE (which clears the SEEK bit).</span>
<a name="l00130"></a>00130 <span class="comment"> For files that do not have the SEEK bit set,</span>
<a name="l00131"></a>00131 <span class="comment"> EOF is considered such an error and -LERR_EOF is returned.</span>
<a name="l00132"></a>00132 <span class="comment"> If you want to stream a disk file like 'tail -f', set the SEEK bit.</span>
<a name="l00133"></a>00133 <span class="comment">*/</span>
<a name="l00134"></a>00134 <span class="keyword">extern</span> <span class="keywordtype">int</span> lio_read ( <span class="keywordtype">int</span> *file, <span class="keywordtype">void</span> *buf, <span class="keywordtype">unsigned</span> count );
<a name="l00135"></a>00135 <span class="keyword">extern</span> <span class="keywordtype">int</span> lio_write ( <span class="keywordtype">int</span> *file, <span class="keyword">const</span> <span class="keywordtype">void</span> *buf, <span class="keywordtype">unsigned</span> count );
<a name="l00136"></a>00136 <span class="keyword">extern</span> <span class="keywordtype">int</span> lio_pread ( <span class="keywordtype">int</span> *file, <span class="keywordtype">void</span> *buf, <span class="keywordtype">unsigned</span> count, <span class="keywordtype">int</span> offset );
<a name="l00137"></a>00137 <span class="keyword">extern</span> <span class="keywordtype">int</span> lio_pwrite ( <span class="keywordtype">int</span> *file, <span class="keyword">const</span> <span class="keywordtype">void</span> *buf, <span class="keywordtype">unsigned</span> count, <span class="keywordtype">int</span> offset );
<a name="l00138"></a>00138 <span class="keyword">extern</span> <span class="keywordtype">int</span> lio_seek ( <span class="keywordtype">int</span> *file, <span class="keywordtype">int</span> offset );
<a name="l00139"></a>00139 <span class="keyword">extern</span> <span class="keywordtype">int</span> lio_trunc ( <span class="keywordtype">int</span> *file, <span class="keywordtype">int</span> offset );
<a name="l00150"></a>00150 <span class="keyword">extern</span> <span class="keywordtype">int</span> lio_mmap ( <span class="keywordtype">int</span> *file, <span class="keywordtype">void</span> **map, <span class="keywordtype">int</span> length );
<a name="l00151"></a>00151
<a name="l00152"></a>00152
<a name="l00161"></a>00161 <span class="keyword">extern</span> <span class="keywordtype">int</span> lio_slurp ( <span class="keywordtype">char</span> **buf, <span class="keywordtype">int</span> sz, <span class="keyword">const</span> <span class="keywordtype">char</span> *name, <span class="keywordtype">int</span> opt );
<a name="l00162"></a>00162
<a name="l00163"></a>00163
<a name="l00164"></a>00164
<a name="l00165"></a>00165 <span class="comment">/* ************************************************************</span>
<a name="l00166"></a>00166 <span class="comment"> streams</span>
<a name="l00167"></a>00167 <span class="comment">*/</span>
<a name="l00168"></a>00168
<a name="l00181"></a>00181 <span class="keyword">typedef</span> <span class="keywordtype">int</span> lio_sfunc ( <span class="keyword">struct</span> <a class="code" href="structIos.html">Ios</a> *s, <span class="keywordtype">int</span> op );
<a name="l00182"></a>00182
<a name="l00183"></a>00183 <span class="keyword">enum</span> {
<a name="l00184"></a>00184 LIO_BUFSIZ = 8192
<a name="l00185"></a>00185 };
<a name="l00186"></a>00186
<a name="l00187"></a><a class="code" href="structBuf.html">00187</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structBuf.html">Buf</a> {
<a name="l00188"></a>00188 <span class="comment">/* struct Buf *nxt; chain -- not used */</span>
<a name="l00189"></a>00189 <span class="keywordtype">short</span> fill; <span class="comment">/* total #bytes in the buffer */</span>
<a name="l00190"></a>00190 <span class="keywordtype">short</span> done; <span class="comment">/* #bytes done */</span>
<a name="l00191"></a>00191 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> c[LIO_BUFSIZ]; <span class="comment">/* actual buffer may be longer */</span>
<a name="l00192"></a>00192 } <a class="code" href="structBuf.html">Buf</a>;
<a name="l00193"></a>00193 <span class="comment">/* fill - done is the number of available bytes */</span>
<a name="l00194"></a>00194 <span class="preprocessor">#define LIO_BAVAIL( b ) ((b)->fill - (b)->done)</span>
<a name="l00195"></a>00195 <span class="preprocessor"></span><span class="preprocessor">#define LIO_BINIT( b ) do { \</span>
<a name="l00196"></a>00196 <span class="preprocessor"> </span><span class="comment">/*(b)->nxt = 0;*/</span> (b)->fill = 0; (b)->done = 0; \
<a name="l00197"></a>00197 } while (0)
<a name="l00198"></a>00198 <span class="preprocessor">#define LIO_BINITIALIZER { 0,0,"" }</span>
<a name="l00199"></a>00199 <span class="preprocessor"></span>
<a name="l00200"></a><a class="code" href="structIos.html">00200</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structIos.html">Ios</a> {
<a name="l00201"></a>00201 lio_sfunc *func;
<a name="l00202"></a>00202 <span class="keyword">const</span> <span class="keywordtype">char</span> *name; <span class="comment">/* stream's name */</span>
<a name="l00203"></a>00203 <span class="keywordtype">int</span> file; <span class="comment">/* file "id" and flags as above */</span>
<a name="l00204"></a>00204 <span class="keywordtype">int</span> pos; <span class="comment">/* logical position of buffer start within stream */</span>
<a name="l00205"></a>00205 <a class="code" href="structBuf.html">Buf</a> b;
<a name="l00206"></a>00206 } <a class="code" href="structIos.html">Ios</a>;
<a name="l00207"></a>00207
<a name="l00208"></a>00208 <span class="preprocessor">#define LIO_SISOPEN( s ) LIO_ISOPEN( (s)->file )</span>
<a name="l00209"></a>00209 <span class="preprocessor"></span><span class="preprocessor">#define LIO_SAVAIL( s ) LIO_BAVAIL( &(s)->b )</span>
<a name="l00210"></a>00210 <span class="preprocessor"></span><span class="preprocessor">#define LIO_SINIT( s, fun, nam, fil ) do { \</span>
<a name="l00211"></a>00211 <span class="preprocessor"> (s)->func = fun; (s)->name = nam; (s)->file = fil; \</span>
<a name="l00212"></a>00212 <span class="preprocessor"> (s)->pos = 0; \</span>
<a name="l00213"></a>00213 <span class="preprocessor"> LIO_BINIT( &(s)->b ); \</span>
<a name="l00214"></a>00214 <span class="preprocessor"> } while (0)</span>
<a name="l00215"></a>00215 <span class="preprocessor"></span><span class="preprocessor">#define LIO_STDINIT( s, nam, fil ) LIO_SINIT( s, lio_stdio, nam, fil )</span>
<a name="l00216"></a>00216 <span class="preprocessor"></span><span class="preprocessor">#define LIO_SINITIALIZER( fun, nam, fil ) { fun, nam, fil, 0, LIO_BINITIALIZER }</span>
<a name="l00217"></a>00217 <span class="preprocessor"></span><span class="preprocessor">#define LIO_STDINITIALIZER( nam, fil ) LIO_SINITIALIZER( lio_stdio, nam, fil )</span>
<a name="l00218"></a>00218 <span class="preprocessor"></span>
<a name="l00219"></a>00219
<a name="l00222"></a>00222 <span class="keyword">enum</span> {
<a name="l00223"></a>00223 LIO_SSIZE, <span class="comment">/* tell the size of the stream structure */</span>
<a name="l00224"></a>00224 LIO_SOPEN, <span class="comment">/* initialize the structure */</span>
<a name="l00225"></a>00225 LIO_SCLOSE, <span class="comment">/* close */</span>
<a name="l00226"></a>00226 LIO_SPURGE, <span class="comment">/* kill the done bytes. return fill buffer size */</span>
<a name="l00227"></a>00227 LIO_SFILL, <span class="comment">/* try to refill the buffer (poll input). return # new bytes */</span>
<a name="l00228"></a>00228 LIO_SFLUSH, <span class="comment">/* try to flush the buffer. return # bytes written */</span>
<a name="l00229"></a>00229 LIO_SPUSH <span class="comment">/* push input stream: munge prefilled input */</span>
<a name="l00230"></a>00230 };
<a name="l00231"></a>00231
<a name="l00236"></a>00236 <span class="keyword">extern</span> <span class="keywordtype">int</span> ioStream ( <a class="code" href="structIos.html">Ios</a> *s, <span class="keywordtype">int</span> op );
<a name="l00237"></a>00237
<a name="l00243"></a>00243 <span class="keyword">extern</span> <span class="keywordtype">int</span> ioStdio ( <a class="code" href="structIos.html">Ios</a> *s, <span class="keywordtype">int</span> op );
<a name="l00244"></a>00244
<a name="l00245"></a>00245 <span class="preprocessor">#define LIO_OPEN( s ) (s)->func( (s), LIO_SOPEN )</span>
<a name="l00246"></a>00246 <span class="preprocessor"></span><span class="preprocessor">#define LIO_CLOSE( s ) (s)->func( (s), LIO_SCLOSE )</span>
<a name="l00247"></a>00247 <span class="preprocessor"></span><span class="preprocessor">#define LIO_FILL( s ) (s)->func( (s), LIO_SFILL )</span>
<a name="l00248"></a>00248 <span class="preprocessor"></span><span class="preprocessor">#define LIO_FLUSH( s ) (s)->func( (s), LIO_SFLUSH )</span>
<a name="l00249"></a>00249 <span class="preprocessor"></span>
<a name="l00250"></a>00250
<a name="l00251"></a>00251
<a name="l00252"></a>00252
<a name="l00253"></a>00253 <span class="comment">/* ************************************************************</span>
<a name="l00254"></a>00254 <span class="comment"> inter process communication</span>
<a name="l00255"></a>00255 <span class="comment">*/</span>
<a name="l00256"></a>00256
<a name="l00257"></a>00257 <span class="keyword">extern</span> CLockFunc *lio_lock;
<a name="l00258"></a>00258 <span class="preprocessor">#define LIO_LOCK() (NULL != lio_lock && lio_lock(OPENISIS_LOCK))</span>
<a name="l00259"></a>00259 <span class="preprocessor"></span><span class="preprocessor">#define LIO_RELE() (NULL != lio_lock && lio_lock(OPENISIS_RELE))</span>
<a name="l00260"></a>00260 <span class="preprocessor"></span><span class="preprocessor">#define LIO_WAIT( c ) (NULL != lio_lock && lio_lock(OPENISIS_WAIT \</span>
<a name="l00261"></a>00261 <span class="preprocessor"> | (OPENISIS_COND & (c))))</span>
<a name="l00262"></a>00262 <span class="preprocessor"></span><span class="preprocessor">#define LIO_WAKE( c ) (NULL != lio_lock && lio_lock(OPENISIS_WAKE \</span>
<a name="l00263"></a>00263 <span class="preprocessor"> | (OPENISIS_COND & (c))))</span>
<a name="l00264"></a>00264 <span class="preprocessor"></span>
<a name="l00265"></a>00265 <span class="preprocessor">#define LIO_H</span>
<a name="l00266"></a>00266 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* LIO_H */</span>
</pre></div></div>
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