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<div id="projectname">Server <span id="projectnumber">0.0.1</span></div>
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<div id="projectbrief">HTTP/REST server implementation</div>
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<h1>src/cbuf/cbuf.c</h1> </div>
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<a href="cbuf_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
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<a name="l00023"></a><a class="code" href="cbuf_8c.html#ac3d144aa01e765a1fae62ab5491c7cc1">00023</a> <span class="preprocessor">#define _POSIX_SOURCE</span>
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<a name="l00024"></a><a class="code" href="cbuf_8c.html#a3024ccd4a9af5109d24e6c57565d74a1">00024</a> <span class="preprocessor"></span><span class="preprocessor">#define _POSIX_C_SOURCE 200112L</span>
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<a name="l00025"></a><a class="code" href="cbuf_8c.html#a369266c24eacffb87046522897a570d5">00025</a> <span class="preprocessor"></span><span class="preprocessor">#define _GNU_SOURCE</span>
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<a name="l00026"></a>00026 <span class="preprocessor"></span>
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<a name="l00027"></a>00027 <span class="preprocessor">#include <sys/types.h></span>
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<a name="l00028"></a>00028 <span class="preprocessor">#include <sys/stat.h></span>
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<a name="l00029"></a>00029 <span class="preprocessor">#include <sys/mman.h></span>
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<a name="l00030"></a>00030 <span class="preprocessor">#include <stdarg.h></span>
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<a name="l00031"></a>00031 <span class="preprocessor">#include <stdlib.h></span>
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<a name="l00032"></a>00032 <span class="preprocessor">#include <stdio.h></span>
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<a name="l00033"></a>00033 <span class="preprocessor">#include <unistd.h></span>
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<a name="l00034"></a>00034 <span class="preprocessor">#include <fcntl.h></span>
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<a name="l00035"></a>00035
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<a name="l00036"></a>00036 <span class="preprocessor">#include "class.h"</span>
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<a name="l00037"></a>00037 <span class="preprocessor">#include "utils/memory.h"</span>
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<a name="l00038"></a>00038
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<a name="l00039"></a>00039 <span class="preprocessor">#include "cbuf.h"</span>
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<a name="l00040"></a>00040
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<a name="l00041"></a>00041
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<a name="l00042"></a>00042 <span class="keyword">static</span> <span class="keywordtype">void</span> cbufDtor(<span class="keywordtype">void</span>*);
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<a name="l00043"></a>00043
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<a name="l00044"></a>00044 <span class="keyword">static</span>
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<a name="l00045"></a>00045 <span class="keywordtype">int</span>
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<a name="l00046"></a>00046 cbufCtor(<span class="keywordtype">void</span> * _this, va_list * params)
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<a name="l00047"></a>00047 {
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<a name="l00048"></a>00048 <a class="code" href="structCbuf.html">Cbuf</a> <span class="keyword">this</span> = _this;
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<a name="l00049"></a>00049 <span class="keywordtype">char</span> state = -1;
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<a name="l00050"></a>00050 <span class="keywordtype">char</span> * shm_name = va_arg(*params, <span class="keywordtype">char</span>*);
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<a name="l00051"></a>00051 <span class="keywordtype">long</span> psize = sysconf(_SC_PAGESIZE);
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<a name="l00052"></a>00052 <span class="keywordtype">size_t</span> size;
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<a name="l00053"></a>00053 <span class="keywordtype">int</span> shm;
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<a name="l00054"></a>00054 <span class="keywordtype">char</span> * data;
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<a name="l00055"></a>00055
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<a name="l00056"></a>00056 this->shm_name = malloc(strlen(shm_name) + 7 + 2);
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<a name="l00057"></a>00057 sprintf(this->shm_name, <span class="stringliteral">"/%06d_%s"</span>, getpid(), shm_name);
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<a name="l00058"></a>00058
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<a name="l00063"></a>00063 size = va_arg(*params, <span class="keywordtype">size_t</span>);
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<a name="l00064"></a>00064 size = (0 >= size)? 1 : (0 != size%psize)? (size/psize)+1 : size/psize;
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<a name="l00065"></a>00065 this->bsize = psize * size;
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<a name="l00066"></a>00066
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<a name="l00067"></a>00067 <span class="keywordflow">while</span> (-1 == state) {
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<a name="l00068"></a>00068 shm = shm_open(this->shm_name, O_RDWR|O_CREAT|O_EXCL, S_IRWXU);
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<a name="l00069"></a>00069 <span class="keywordflow">if</span> (-1 == shm) {
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<a name="l00070"></a>00070 <span class="keywordflow">break</span>;
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<a name="l00071"></a>00071 }
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<a name="l00072"></a>00072
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<a name="l00073"></a>00073 <span class="keywordflow">if</span> (-1 == ftruncate(shm, this->bsize)) {
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<a name="l00074"></a>00074 <span class="keywordflow">break</span>;
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<a name="l00075"></a>00075 }
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<a name="l00076"></a>00076
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<a name="l00077"></a>00077 this->data = mmap (0, this->bsize << 1,
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<a name="l00078"></a>00078 PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
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<a name="l00079"></a>00079 <span class="keywordflow">if</span> (this->data == MAP_FAILED) {
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<a name="l00080"></a>00080 this->data = NULL;
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<a name="l00081"></a>00081 <span class="keywordflow">break</span>;
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<a name="l00082"></a>00082 }
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<a name="l00083"></a>00083
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<a name="l00084"></a>00084 data = mmap (this->data, this->bsize,
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<a name="l00085"></a>00085 PROT_READ|PROT_WRITE, MAP_FIXED|MAP_SHARED, shm, 0);
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<a name="l00086"></a>00086 <span class="keywordflow">if</span> (data != this->data) {
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<a name="l00087"></a>00087 <span class="keywordflow">break</span>;
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<a name="l00088"></a>00088 }
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<a name="l00089"></a>00089
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<a name="l00090"></a>00090 data = mmap (this->data + this->bsize, this->bsize,
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<a name="l00091"></a>00091 PROT_READ|PROT_WRITE, MAP_FIXED|MAP_SHARED, shm, 0);
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<a name="l00092"></a>00092 <span class="keywordflow">if</span> (data != this->data + this->bsize) {
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<a name="l00093"></a>00093 <span class="keywordflow">break</span>;
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<a name="l00094"></a>00094 }
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<a name="l00095"></a>00095
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<a name="l00096"></a>00096 state = 0;
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<a name="l00097"></a>00097 }
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<a name="l00098"></a>00098
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<a name="l00099"></a>00099 <span class="keywordflow">if</span> (-1 != shm) {
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<a name="l00100"></a>00100 shm_unlink(this->shm_name);
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<a name="l00101"></a>00101 close(shm);
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<a name="l00102"></a>00102 }
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<a name="l00103"></a>00103
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<a name="l00104"></a>00104 <span class="keywordflow">return</span> state;
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<a name="l00105"></a>00105 }
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<a name="l00106"></a>00106
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<a name="l00107"></a>00107 <span class="keyword">static</span>
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<a name="l00108"></a>00108 <span class="keywordtype">void</span>
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<a name="l00109"></a>00109 cbufDtor(<span class="keywordtype">void</span> * _this)
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<a name="l00110"></a>00110 {
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<a name="l00111"></a>00111 <a class="code" href="structCbuf.html">Cbuf</a> <span class="keyword">this</span> = _this;
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<a name="l00112"></a>00112
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<a name="l00113"></a>00113 <a class="code" href="memory_8h.html#a717b411d846e077ecccf689e256b9865">FREE</a>(this->shm_name);
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<a name="l00114"></a>00114
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<a name="l00115"></a>00115 <span class="keywordflow">if</span> (NULL != this->data && MAP_FAILED != this->data) {
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<a name="l00116"></a>00116 munmap(this->data, this->bsize << 1);
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<a name="l00117"></a>00117 }
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<a name="l00118"></a>00118
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<a name="l00119"></a>00119 this->data = NULL;
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<a name="l00120"></a>00120 }
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<a name="l00121"></a>00121
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<a name="l00122"></a>00122 <a class="code" href="interface_8h.html#a446cc7d7282f8a0b8e62a371671ea605">INIT_IFACE</a>(Class, cbufCtor, cbufDtor, NULL);
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<a name="l00123"></a>00123 <a class="code" href="class_2class_8h.html#a509b4880afb25bb862c448d7a71e7afe">CREATE_CLASS</a>(<a class="code" href="structCbuf.html">Cbuf</a>, NULL, <a class="code" href="interface_8h.html#a02255665665c91d905ec32d00d9a4a85">IFACE</a>(Class));
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<a name="l00124"></a>00124
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<a name="l00125"></a>00125 <span class="comment">// vim: set ts=4 sw=4:</span>
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</pre></div></div>
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.7.3 </li>
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