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<a class="qindex" href="main.html">Main Page</a> <a class="qindex" href="namespaces.html">Namespace List</a> <a class="qindex" href="hierarchy.html">Class Hierarchy</a> <a class="qindex" href="annotated.html">Compound List</a> <a class="qindex" href="files.html">File List</a> <a class="qindex" href="namespacemembers.html">Namespace Members</a> <a class="qindex" href="functions.html">Compound Members</a> <a class="qindex" href="globals.html">File Members</a> </center>
<hr><h1>daemon_unix.cc</h1><a href="a00086.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <font class="comment">// Package : omniEvents</font>
00002 <font class="comment">// daemon_unix.h Created : 2004/06/29</font>
00003 <font class="comment">// Author : Alex Tingle</font>
00004 <font class="comment">//</font>
00005 <font class="comment">// Copyright (C) 2004 Alex Tingle.</font>
00006 <font class="comment">//</font>
00007 <font class="comment">// This file is part of the omniEvents application.</font>
00008 <font class="comment">//</font>
00009 <font class="comment">// omniEvents is free software; you can redistribute it and/or</font>
00010 <font class="comment">// modify it under the terms of the GNU Lesser General Public</font>
00011 <font class="comment">// License as published by the Free Software Foundation; either</font>
00012 <font class="comment">// version 2.1 of the License, or (at your option) any later version.</font>
00013 <font class="comment">//</font>
00014 <font class="comment">// omniEvents is distributed in the hope that it will be useful,</font>
00015 <font class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00016 <font class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</font>
00017 <font class="comment">// Lesser General Public License for more details.</font>
00018 <font class="comment">//</font>
00019 <font class="comment">// You should have received a copy of the GNU Lesser General Public</font>
00020 <font class="comment">// License along with this library; if not, write to the Free Software</font>
00021 <font class="comment">// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</font>
00022 <font class="comment">//</font>
00023
00024 <font class="preprocessor">#include "<a class="code" href="a00085.html">daemon.h</a>"</font>
00025 <font class="preprocessor">#include "<a class="code" href="a00106.html">main.h</a>"</font>
00026 <font class="preprocessor">#include "<a class="code" href="a00087.html">daemon_unix.h</a>"</font>
00027
<a name="l00028"></a><a class="code" href="a00086.html#a0">00028</a> <font class="preprocessor">#define NEED_PACKAGE_INFO</font>
00029 <font class="preprocessor"></font><font class="preprocessor">#ifdef HAVE_CONFIG_H</font>
00030 <font class="preprocessor"></font><font class="preprocessor"># include "<a class="code" href="a00082.html">config.h</a>"</font>
00031 <font class="preprocessor">#endif</font>
00032 <font class="preprocessor"></font>
00033 <font class="preprocessor">#ifdef HAVE_IOSTREAM</font>
00034 <font class="preprocessor"></font><font class="preprocessor"># include <iostream></font>
00035 <font class="preprocessor"># include <fstream></font>
00036 <font class="preprocessor">#else</font>
00037 <font class="preprocessor"></font><font class="preprocessor"># include <iostream.h></font>
00038 <font class="preprocessor"># include <fstream.h></font>
00039 <font class="preprocessor">#endif</font>
00040 <font class="preprocessor"></font>
00041 <font class="preprocessor">#ifdef HAVE_STD_IOSTREAM</font>
00042 <font class="preprocessor"></font><font class="keyword">using</font> <font class="keyword">namespace </font>std;
00043 <font class="preprocessor">#endif</font>
00044 <font class="preprocessor"></font>
00045 <font class="preprocessor">#include <stdlib.h></font> <font class="comment">// exit, on_exit</font>
00046 <font class="preprocessor">#include <errno.h></font> <font class="comment">// errno</font>
00047
00048 <font class="preprocessor">#ifdef HAVE_UNISTD_H</font>
00049 <font class="preprocessor"></font><font class="preprocessor"># include <unistd.h></font> <font class="comment">// fork, umask, setsid, dup2, chdir, close</font>
00050 <font class="preprocessor">#endif</font>
00051 <font class="preprocessor"></font>
00052 <font class="preprocessor">#ifdef HAVE_SYS_TYPES_H</font>
00053 <font class="preprocessor"></font><font class="preprocessor"># include <sys/types.h></font> <font class="comment">// fork, umask, open</font>
00054 <font class="preprocessor">#endif</font>
00055 <font class="preprocessor"></font>
00056 <font class="preprocessor">#ifdef HAVE_SYS_STAT_H</font>
00057 <font class="preprocessor"></font><font class="preprocessor"># include <sys/stat.h></font> <font class="comment">//open</font>
00058 <font class="preprocessor">#endif</font>
00059 <font class="preprocessor"></font>
00060 <font class="preprocessor">#ifdef HAVE_FCNTL_H</font>
00061 <font class="preprocessor"></font><font class="preprocessor"># include <fcntl.h></font> <font class="comment">// open</font>
00062 <font class="preprocessor">#endif</font>
00063 <font class="preprocessor"></font>
00064 <font class="preprocessor">#ifdef HAVE_SYSLOG_H</font>
00065 <font class="preprocessor"></font><font class="preprocessor"># include <syslog.h></font> <font class="comment">// openlog, syslog</font>
00066 <font class="preprocessor">#endif</font>
00067 <font class="preprocessor"></font>
00068 <font class="preprocessor">#ifdef HAVE_STRING_H</font>
00069 <font class="preprocessor"></font><font class="preprocessor"># include <string.h></font> <font class="comment">// strerror</font>
00070 <font class="preprocessor">#endif</font>
00071 <font class="preprocessor"></font>
00072 <font class="preprocessor">#ifdef HAVE_SIGNAL_H</font>
00073 <font class="preprocessor"></font><font class="preprocessor">#include <signal.h></font> <font class="comment">// kill</font>
00074 <font class="preprocessor">#endif</font>
00075 <font class="preprocessor"></font>
00076 <font class="preprocessor">#include <string></font>
00077
00078 <font class="comment">// Forward declaration of omniORB::setLogFunction()</font>
<a name="l00079"></a><a class="code" href="a00139.html">00079</a> <font class="keyword">namespace </font>omniORB {
00080 <font class="keywordtype">void</font> <a class="code" href="a00139.html#a0">setLogFunction</a>(<font class="keywordtype">void</font> (*logFunction)(<font class="keyword">const</font> <font class="keywordtype">char</font>*));
00081 }
00082
00083 <font class="keyword">namespace </font>OmniEvents {
00084
<a name="l00085"></a><a class="code" href="a00086.html#a1">00085</a> <font class="preprocessor">#define STRERR_FILE_LINE strerror(errno)<<" "<<__FILE__<<":"<<__LINE__</font>
00086 <font class="preprocessor"></font>
<a name="l00087"></a><a class="code" href="a00086.html#a2">00087</a> <font class="preprocessor">#define PIPE_READ 0</font>
<a name="l00088"></a><a class="code" href="a00086.html#a3">00088</a> <font class="preprocessor"></font><font class="preprocessor">#define PIPE_WRITE 1</font>
00089 <font class="preprocessor"></font>
00090
<a name="l00094"></a><a class="code" href="a00138.html#a0">00094</a> <a class="code" href="a00045.html">DaemonImpl</a> <a class="code" href="a00138.html#a0">daemon</a>;
00095
<a name="l00096"></a><a class="code" href="a00044.html#a0">00096</a> Daemon::Daemon(<font class="keywordtype">int</font>&,<font class="keywordtype">char</font>**&)
00097 {
00098 <font class="comment">// Initialise the DaemonImpl singleton.</font>
00099 daemon.<a class="code" href="a00045.html#m0">_tracefile</a>=NULL;
00100 daemon.<a class="code" href="a00045.html#m1">_foreground</a>=<font class="keyword">false</font>;
00101 daemon.<a class="code" href="a00045.html#m2">_pidfile</a>=NULL;
00102 daemon.<a class="code" href="a00045.html#m3">_pipe</a>[0]=daemon.<a class="code" href="a00045.html#m3">_pipe</a>[1]=-1;
00103 daemon.<a class="code" href="a00045.html#m4">_havePidfile</a>=<font class="keyword">false</font>;
00104 daemon.<a class="code" href="a00045.html#m5">_haveParent</a>=<font class="keyword">false</font>;
00105 daemon.<a class="code" href="a00045.html#m6">_haveSyslog</a>=<font class="keyword">false</font>;
00106 }
<a name="l00107"></a><a class="code" href="a00044.html#a2">00107</a> <font class="keywordtype">void</font> Daemon::tracefile(<font class="keyword">const</font> <font class="keywordtype">char</font>* val) { daemon.<a class="code" href="a00045.html#a2">tracefile</a>(val); }
<a name="l00108"></a><a class="code" href="a00044.html#a3">00108</a> <font class="keywordtype">void</font> Daemon::pidfile(<font class="keyword">const</font> <font class="keywordtype">char</font>* val) { daemon.<a class="code" href="a00045.html#a3">pidfile</a>(val); }
<a name="l00109"></a><a class="code" href="a00044.html#a4">00109</a> <font class="keywordtype">void</font> Daemon::foreground(<font class="keywordtype">bool</font> val) { daemon.<a class="code" href="a00045.html#a4">foreground</a>(val); }
<a name="l00110"></a><a class="code" href="a00044.html#a5">00110</a> <font class="keywordtype">void</font> Daemon::daemonize() { daemon.<a class="code" href="a00045.html#a6">daemonize</a>(); }
<a name="l00111"></a><a class="code" href="a00044.html#a6">00111</a> <font class="keywordtype">void</font> Daemon::runningOk() { daemon.<a class="code" href="a00045.html#a7">runningOk</a>(); }
<a name="l00112"></a><a class="code" href="a00044.html#a1">00112</a> Daemon::~Daemon() { daemon.<a class="code" href="a00045.html#a8">shutdown</a>(0); }
00113
<a name="l00114"></a><a class="code" href="a00138.html#a3">00114</a> <font class="keywordtype">void</font> <a class="code" href="a00138.html#a3">shutdown0</a>(<font class="keywordtype">void</font>) { daemon.<a class="code" href="a00045.html#a8">shutdown</a>(0); }
<a name="l00115"></a><a class="code" href="a00138.html#a4">00115</a> <font class="keywordtype">void</font> <a class="code" href="a00138.html#a4">shutdown2</a>(<font class="keywordtype">int</font> s,<font class="keywordtype">void</font>*){ daemon.<a class="code" href="a00045.html#a8">shutdown</a>(s); }
00116
00118
<a name="l00119"></a><a class="code" href="a00045.html#a0">00119</a> DaemonImpl::DaemonImpl(){}
00120
00121
<a name="l00122"></a><a class="code" href="a00045.html#a1">00122</a> DaemonImpl::~DaemonImpl()
00123 {
00124 <font class="keyword">delete</font>[] <a class="code" href="a00045.html#m2">_pidfile</a>;
00125 <font class="keyword">delete</font>[] <a class="code" href="a00045.html#m0">_tracefile</a>;
00126 <a class="code" href="a00045.html#m2">_pidfile</a>=NULL;
00127 <a class="code" href="a00045.html#m0">_tracefile</a>=NULL;
00128 }
00129
00130
<a name="l00131"></a><a class="code" href="a00045.html#a2">00131</a> <font class="keywordtype">void</font> DaemonImpl::tracefile(<font class="keyword">const</font> <font class="keywordtype">char</font>* val)
00132 {
00133 <a class="code" href="a00045.html#m0">_tracefile</a>=::strdup(val);
00134 }
00135
00136
<a name="l00137"></a><a class="code" href="a00045.html#a4">00137</a> <font class="keywordtype">void</font> DaemonImpl::foreground(<font class="keywordtype">bool</font> val)
00138 {
00139 <a class="code" href="a00045.html#m1">_foreground</a>=val;
00140 }
00141
00142
<a name="l00143"></a><a class="code" href="a00045.html#a3">00143</a> <font class="keywordtype">void</font> DaemonImpl::pidfile(<font class="keyword">const</font> <font class="keywordtype">char</font>* val)
00144 {
00145 string pidfileStr =val;
00146 <font class="keywordflow">if</font>(pidfileStr[0]!=<font class="charliteral">'/'</font>)
00147 pidfileStr=string(<font class="stringliteral">"/var/run/"</font>)+pidfileStr;
00148 DaemonImpl::_pidfile=::strdup(pidfileStr.c_str());
00149 }
00150
00151
<a name="l00152"></a><a class="code" href="a00045.html#a5">00152</a> <font class="keywordtype">void</font> DaemonImpl::initialize(<font class="keywordtype">int</font>&,<font class="keywordtype">char</font>**&)
00153 {
00154 <font class="comment">// Does nothing on Unix</font>
00155 }
00156
00157
<a name="l00158"></a><a class="code" href="a00045.html#a6">00158</a> <font class="keywordtype">void</font> DaemonImpl::daemonize()
00159 {
00160 <font class="comment">// Register the shutdown function.</font>
00161 <font class="preprocessor">#ifdef HAVE_ON_EXIT</font>
00162 <font class="preprocessor"></font> <font class="keywordflow">if</font>( ::on_exit(<a class="code" href="a00138.html#a4">shutdown2</a>,NULL) <0)
00163 <font class="preprocessor">#else</font>
00164 <font class="preprocessor"></font> <font class="keywordflow">if</font>( ::atexit(shutdown0) <0)
00165 <font class="preprocessor">#endif</font>
00166 <font class="preprocessor"></font> {
00167 cerr<<<font class="stringliteral">"Failed to set exit handler."</font><<endl;
00168 ::exit(-1);
00169 }
00170
00171 <font class="keywordflow">if</font>(!<a class="code" href="a00045.html#m1">_foreground</a>)
00172 {
00173 this-><a class="code" href="a00045.html#c0">fork</a>();
00174 <font class="comment">// ...now in the CHILD.</font>
00175 }
00176
00177 <font class="comment">// Check & write the pidfile (if _pidfile is set).</font>
00178 <a class="code" href="a00045.html#c3">checkPidfileOrShutdown</a>();
00179 <a class="code" href="a00045.html#c4">writePidfile</a>();
00180
00181 <font class="comment">// Change the file mode mask</font>
00182 ::umask(0);
00183
00184 <font class="comment">// Change the current working directory</font>
00185 <font class="keywordflow">if</font>(::chdir(<font class="stringliteral">"/"</font>)!=0)
00186 {
00187 cerr<<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00188 ::exit(-1);
00189 }
00190
00191 <font class="comment">// If _tracefile is not set, then use syslog.</font>
00192 <font class="keywordflow">if</font>(<a class="code" href="a00045.html#m0">_tracefile</a> && <a class="code" href="a00045.html#m0">_tracefile</a>[0]!=<font class="charliteral">'\0'</font>)
00193 {
00194 <a class="code" href="a00045.html#c1">redirectStreamsTo</a>(<a class="code" href="a00045.html#m0">_tracefile</a>);
00195 }
00196 <font class="keywordflow">else</font>
00197 {
00198 <font class="preprocessor">#ifndef HAVE_OMNIORB3</font>
00199 <font class="preprocessor"></font><font class="preprocessor"># ifdef LOG_PERROR</font>
00200 <font class="preprocessor"></font> ::openlog(<a class="code" href="a00082.html#a40">PACKAGE_NAME</a> <font class="stringliteral">": "</font>,LOG_PID|LOG_PERROR,LOG_DAEMON);
00201 <font class="preprocessor"># else</font>
00202 <font class="preprocessor"></font> ::openlog(<a class="code" href="a00082.html#a40">PACKAGE_NAME</a> <font class="stringliteral">": "</font>,LOG_PID,LOG_DAEMON);
00203 <font class="preprocessor"># endif</font>
00204 <font class="preprocessor"></font> <a class="code" href="a00045.html#m6">_haveSyslog</a>=<font class="keyword">true</font>;
00205 <a class="code" href="a00139.html#a0">omniORB::setLogFunction</a>(DaemonImpl::log);
00206 <font class="preprocessor">#else</font>
00207 <font class="preprocessor"></font> cerr<<<font class="stringliteral">"You must use option -t to set the file for trace messages."</font>
00208 <font class="stringliteral">"\n(This is because omniORB3 cannot redirect messages to syslog.)"</font><<endl;
00209 ::exit(-1);
00210 <font class="preprocessor">#endif</font>
00211 <font class="preprocessor"></font> }
00212 } <font class="comment">// end daemonize()</font>
00213
00214
<a name="l00215"></a><a class="code" href="a00045.html#a7">00215</a> <font class="keywordtype">void</font> DaemonImpl::runningOk()
00216 {
00217 <font class="keywordflow">if</font>(_haveParent)
00218 {
00219 <a class="code" href="a00045.html#m5">_haveParent</a>=<font class="keyword">false</font>;
00220 <a class="code" href="a00045.html#c6">notifyParent</a>(0);
00221 }
00222
00223 <font class="comment">// No longer send syslog messages to stderr.</font>
00224 <font class="keywordflow">if</font>(_haveSyslog)
00225 {
00226 <font class="preprocessor">#ifdef LOG_PERROR</font>
00227 <font class="preprocessor"></font> ::closelog();
00228 <font class="comment">// FIXME: Possible race here? If a log message is sent right now.</font>
00229 ::openlog(<a class="code" href="a00082.html#a40">PACKAGE_NAME</a> <font class="stringliteral">": "</font>,LOG_PID,LOG_DAEMON);
00230 <font class="preprocessor">#endif</font>
00231 <font class="preprocessor"></font> <a class="code" href="a00045.html#c1">redirectStreamsTo</a>(<font class="stringliteral">"/dev/null"</font>);
00232 }
00233 }
00234
00235
<a name="l00236"></a><a class="code" href="a00045.html#a8">00236</a> <font class="keywordtype">void</font> DaemonImpl::shutdown(<font class="keywordtype">int</font> status)
00237 {
00238 <font class="comment">// Remove the pidfile.</font>
00239 <font class="keywordflow">if</font>(<a class="code" href="a00045.html#m4">_havePidfile</a> && <a class="code" href="a00045.html#m2">_pidfile</a> && 0!=::unlink(_pidfile))
00240 {
00241 cerr<<<font class="stringliteral">"Failed to remove pidfile '"</font><<<a class="code" href="a00045.html#m2">_pidfile</a><<<font class="stringliteral">"': "</font>
00242 <<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00243 status=-1;
00244 }
00245 <a class="code" href="a00045.html#m4">_havePidfile</a>=<font class="keyword">false</font>;
00246
00247 <font class="comment">// Close syslog.</font>
00248 <font class="keywordflow">if</font>(_haveSyslog)
00249 {
00250 <a class="code" href="a00045.html#m6">_haveSyslog</a>=<font class="keyword">false</font>;
00251 ::closelog();
00252 }
00253
00254 <font class="comment">// Notify the parent.</font>
00255 <font class="keywordflow">if</font>(_haveParent)
00256 {
00257 <a class="code" href="a00045.html#m5">_haveParent</a>=<font class="keyword">false</font>;
00258 <a class="code" href="a00045.html#c6">notifyParent</a>(status);
00259 }
00260
00261 <font class="comment">// outtahere...</font>
00262 }
00263
00264
<a name="l00265"></a><a class="code" href="a00045.html#d0">00265</a> <font class="keywordtype">void</font> DaemonImpl::log(<font class="keyword">const</font> <font class="keywordtype">char</font>* message)
00266 {
00267 <font class="keywordtype">int</font> priority =LOG_INFO;
00268 <font class="comment">// Cut off the redundant package name prefix.</font>
00269 <font class="comment">// "omniEvents: " --> stripped off</font>
00270 <font class="comment">// "omniEvents! " --> stripped off and sets priority to LOG_ERR</font>
00271 <font class="keyword">const</font> <font class="keywordtype">char</font>* mPos( message );
00272 <font class="keyword">const</font> <font class="keywordtype">char</font>* pPos( <font class="stringliteral">"omniEvents: "</font> );
00273 <font class="keywordflow">while</font>(*mPos && (*mPos==*pPos || *pPos==<font class="charliteral">':'</font>))
00274 {
00275 ++mPos;
00276 ++pPos;
00277 <font class="keywordflow">if</font>(!*pPos)
00278 {
00279 <font class="keywordflow">switch</font>(message[10])
00280 {
00281 <font class="keywordflow">case</font> <font class="charliteral">'!'</font>: priority=LOG_ERR; <font class="comment">// ...AND DROPS THROUGH...</font>
00282 <font class="keywordflow">case</font> <font class="charliteral">':'</font>: message=mPos;
00283 }
00284 <font class="keywordflow">break</font>; <font class="comment">// loop exit</font>
00285 }
00286 }
00287 <font class="comment">// Send the message.</font>
00288 ::syslog(priority,message);
00289 <font class="preprocessor">#ifndef LOG_PERROR</font>
00290 <font class="preprocessor"></font> <font class="comment">// If we don't have LOG_PERROR, then we'll have to manually send</font>
00291 <font class="comment">// log messages to stderr.</font>
00292 <font class="keywordflow">if</font>(daemon.<a class="code" href="a00045.html#m5">_haveParent</a>)
00293 cerr<<message<<flush;
00294 <font class="preprocessor">#endif</font>
00295 <font class="preprocessor"></font>}
00296
00297
<a name="l00298"></a><a class="code" href="a00045.html#c3">00298</a> <font class="keywordtype">void</font> DaemonImpl::checkPidfileOrShutdown()
00299 {
00300 <font class="keywordflow">if</font>(!<a class="code" href="a00045.html#m2">_pidfile</a>)
00301 <font class="keywordflow">return</font>;
00302
00303 <font class="comment">// Try to read pidfile.</font>
00304 pid_t pidFromFile =0;
00305 <font class="keyword">struct </font>stat buf;
00306 <font class="keywordflow">if</font>(0==::stat(<a class="code" href="a00045.html#m2">_pidfile</a>,&buf))
00307 {
00308 <font class="keywordflow">if</font>(!S_ISREG(buf.st_mode))
00309 {
00310 cerr<<<font class="stringliteral">"Pidfile '"</font><<<a class="code" href="a00045.html#m2">_pidfile</a><<<font class="stringliteral">"' is not a regular file."</font><<endl;
00311 ::exit(-1);
00312 }
00313 <font class="keywordflow">try</font>
00314 {
00315 ifstream infile(<a class="code" href="a00045.html#m2">_pidfile</a>);
00316 infile>>pidFromFile;
00317 infile.close();
00318 }
00319 <font class="keywordflow">catch</font>(...)
00320 {
00321 cerr<<<font class="stringliteral">"Failed to read pidfile'"</font><<<a class="code" href="a00045.html#m2">_pidfile</a><<<font class="stringliteral">"'."</font><<endl;
00322 ::exit(-1);
00323 }
00324 }
00325 <font class="keywordflow">else</font> <font class="keywordflow">if</font>(errno!=ENOENT)
00326 {
00327 cerr<<<font class="stringliteral">"Failed to stat pidfile '"</font><<<a class="code" href="a00045.html#m2">_pidfile</a><<<font class="stringliteral">"': "</font>
00328 <<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00329 ::exit(-1);
00330 }
00331
00332 <font class="comment">// If process 'pidFromFile' is running then exit, else remove pidfile.</font>
00333 <font class="keywordflow">if</font>(pidFromFile>0)
00334 {
00335 <font class="keywordflow">if</font>(0==::kill(pidFromFile,0)) <font class="comment">// tests for running 'pidFromFile'.</font>
00336 {
00337 cerr<<<font class="stringliteral">"Quitting because process "</font><<pidFromFile
00338 <<<font class="stringliteral">" defined in pidfile '"</font><<<a class="code" href="a00045.html#m2">_pidfile</a><<<font class="stringliteral">"'"</font>
00339 <<<font class="stringliteral">" is already running."</font><<endl;
00340 ::exit(-1);
00341 }
00342 <font class="keywordflow">else</font> <font class="keywordflow">if</font>(errno!=ESRCH)
00343 {
00344 cerr<<<font class="stringliteral">"Failed to test for process "</font><<pidFromFile
00345 <<<font class="stringliteral">" defined in pidfile '"</font><<<a class="code" href="a00045.html#m2">_pidfile</a><<<font class="stringliteral">"': "</font>
00346 <<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00347 ::exit(-1);
00348 }
00349 }
00350 }
00351
00352
<a name="l00353"></a><a class="code" href="a00045.html#c4">00353</a> <font class="keywordtype">void</font> DaemonImpl::writePidfile()
00354 {
00355 <font class="keywordflow">if</font>(_pidfile)
00356 {
00357 <font class="keywordflow">try</font>
00358 {
00359 <font class="preprocessor">#ifdef FSTREAM_OPEN_PROT</font>
00360 <font class="preprocessor"></font> ofstream outfile(<a class="code" href="a00045.html#m2">_pidfile</a>,ios::out|ios::trunc,0644);
00361 <font class="preprocessor">#else</font>
00362 <font class="preprocessor"></font> ofstream outfile(<a class="code" href="a00045.html#m2">_pidfile</a>,ios::out|ios::trunc);
00363 <font class="preprocessor">#endif</font>
00364 <font class="preprocessor"></font> outfile<<::getpid()<<endl;
00365 outfile.close();
00366 <font class="comment">// Tell shutdown() that the pidfile needs to be cleared away.</font>
00367 <a class="code" href="a00045.html#m4">_havePidfile</a>=<font class="keyword">true</font>;
00368 }
00369 <font class="keywordflow">catch</font>(...)
00370 {
00371 cerr<<<font class="stringliteral">"Failed to write pidfile '"</font><<<a class="code" href="a00045.html#m2">_pidfile</a><<<font class="stringliteral">"'."</font><<endl;
00372 ::exit(-1);
00373 }
00374 }
00375 }
00376
00377
<a name="l00378"></a><a class="code" href="a00045.html#c0">00378</a> <font class="keywordtype">void</font> DaemonImpl::fork()
00379 {
00380 <font class="keywordflow">if</font>( ::pipe(_pipe) <0)
00381 {
00382 cerr<<<font class="stringliteral">"Failed to open pipe: "</font><<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00383 ::exit(-1);
00384 }
00385
00386 <font class="comment">// Fork off from the parent process</font>
00387 pid_t pid =::fork();
00388 <font class="keywordflow">if</font>(pid<0)
00389 {
00390 cerr<<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00391 ::exit(-1);
00392 }
00393 <font class="keywordflow">else</font> <font class="keywordflow">if</font>(pid>0)
00394 {
00395 <font class="comment">//</font>
00396 <font class="comment">// Now in the PARENT</font>
00397 <font class="comment">//</font>
00398
00399 <font class="comment">// Close the write end of the pipe.</font>
00400 <font class="keywordflow">if</font>( ::close(<a class="code" href="a00045.html#m3">_pipe</a>[<a class="code" href="a00086.html#a3">PIPE_WRITE</a>]) <0)
00401 cerr<<<font class="stringliteral">"Failed to close pipe: "</font><<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00402
00403 ::_exit(<a class="code" href="a00045.html#c5">waitForChild</a>()); <font class="comment">// Exit without flushing buffers</font>
00404 }
00405
00406 <font class="comment">//</font>
00407 <font class="comment">// ...now in the CHILD.</font>
00408 <font class="comment">//</font>
00409
00410 <a class="code" href="a00045.html#m5">_haveParent</a>=<font class="keyword">true</font>;
00411
00412 <font class="comment">// Close the read end of the pipe</font>
00413 <font class="keywordflow">if</font>( ::close(<a class="code" href="a00045.html#m3">_pipe</a>[<a class="code" href="a00086.html#a2">PIPE_READ</a>]) <0)
00414 cerr<<<font class="stringliteral">"Failed to close pipe: "</font><<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00415
00416 <font class="comment">// Create a new SID for the child process</font>
00417 pid_t sid =::setsid();
00418 <font class="keywordflow">if</font>(sid<0)
00419 {
00420 cerr<<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00421 ::exit(-1);
00422 }
00423 }
00424
00425
<a name="l00426"></a><a class="code" href="a00045.html#c1">00426</a> <font class="keywordtype">void</font> DaemonImpl::redirectStreamsTo(<font class="keyword">const</font> <font class="keywordtype">char</font>* filename)
00427 {
00428 <font class="keywordflow">if</font>(<a class="code" href="a00045.html#c2">openFileFor</a>(<a class="code" href="a00099.html#a0">STDIN_FILENO</a>,<font class="stringliteral">"/dev/null"</font>,O_RDONLY)<0)
00429 {
00430 cerr<<<font class="stringliteral">"Failed to open /dev/null for STDIN: "</font><<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00431 ::exit(-1);
00432 }
00433 <font class="keywordflow">if</font>(<a class="code" href="a00045.html#c2">openFileFor</a>(<a class="code" href="a00099.html#a1">STDOUT_FILENO</a>,filename,O_WRONLY|O_CREAT|O_APPEND)<0)
00434 {
00435 cerr<<<font class="stringliteral">"Failed to open "</font><<filename<<<font class="stringliteral">" for STDOUT: "</font><<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00436 ::exit(-1);
00437 }
00438 <font class="keywordflow">if</font>(<a class="code" href="a00045.html#c2">openFileFor</a>(STDERR_FILENO,filename,O_WRONLY|O_CREAT|O_APPEND)<0)
00439 {
00440 cerr<<<font class="stringliteral">"Failed to open "</font><<filename<<<font class="stringliteral">" for STDERR: "</font><<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00441 ::exit(-1);
00442 }
00443 }
00444
00445
<a name="l00446"></a><a class="code" href="a00045.html#c2">00446</a> <font class="keywordtype">int</font> DaemonImpl::openFileFor(<font class="keywordtype">int</font> fd, <font class="keyword">const</font> <font class="keywordtype">char</font>* filename, <font class="keywordtype">int</font> flags)
00447 {
00448 <font class="keywordtype">int</font> newfd =::open(filename,flags,0644);
00449 <font class="keywordflow">if</font>(newfd<0)
00450 <font class="keywordflow">return</font> -1;
00451 <font class="keywordflow">if</font>(newfd==fd)
00452 <font class="keywordflow">return</font> fd;
00453 <font class="keywordflow">if</font>(::dup2(newfd,fd)<0) <font class="comment">// replace fd with a copy of newfd</font>
00454 <font class="keywordflow">return</font> -1;
00455 ::close(newfd);
00456 <font class="keywordflow">return</font> fd;
00457 }
00458
00459
<a name="l00460"></a><a class="code" href="a00045.html#c5">00460</a> <font class="keywordtype">int</font> DaemonImpl::waitForChild()
00461 {
00462 <font class="keywordtype">int</font> status =-1;
00463 ssize_t bytes =::read(<a class="code" href="a00045.html#m3">_pipe</a>[<a class="code" href="a00086.html#a2">PIPE_READ</a>],&status,<font class="keyword">sizeof</font>(status));
00464 <font class="keywordflow">if</font>(bytes<<font class="keyword">sizeof</font>(status))
00465 {
00466 status=-1;
00467 <font class="keywordflow">if</font>(bytes<0)
00468 cerr<<<font class="stringliteral">"Parent failed to read result from pipe: "</font><<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00469 }
00470 <font class="keywordflow">if</font>( ::close(<a class="code" href="a00045.html#m3">_pipe</a>[<a class="code" href="a00086.html#a2">PIPE_READ</a>]) !=0)
00471 cerr<<<font class="stringliteral">"Failed to close pipe: "</font><<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00472
00473 <font class="keywordflow">return</font> status;
00474 }
00475
00476
<a name="l00477"></a><a class="code" href="a00045.html#c6">00477</a> <font class="keywordtype">void</font> DaemonImpl::notifyParent(<font class="keywordtype">int</font> status)
00478 {
00479 ssize_t r =::write(<a class="code" href="a00045.html#m3">_pipe</a>[<a class="code" href="a00086.html#a3">PIPE_WRITE</a>],&status,<font class="keyword">sizeof</font>(status));
00480 <font class="keywordflow">if</font>(r<<font class="keyword">sizeof</font>(status))
00481 {
00482 <font class="keywordflow">if</font>(r<0)
00483 cerr<<<font class="stringliteral">"read() failed while writing return value to pipe: "</font>
00484 <<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00485 <font class="keywordflow">else</font>
00486 cerr<<<font class="stringliteral">"write() too short while writing return value from pipe: "</font>
00487 <<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00488 }
00489 <font class="keywordflow">if</font>( ::close(<a class="code" href="a00045.html#m3">_pipe</a>[<a class="code" href="a00086.html#a3">PIPE_WRITE</a>]) !=0)
00490 cerr<<<font class="stringliteral">"Failed to close pipe: "</font><<<a class="code" href="a00086.html#a1">STRERR_FILE_LINE</a><<endl;
00491 }
00492
00493 } <font class="comment">// end namespace OmniEvents</font>
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