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<font color="#0000ff">// Copyright (c) 1999-2002 David Muse</font>
<font color="#0000ff">// See the COPYING file for more information.</font>
<font color="#a020f0">#ifndef RUDIMENTS_DAEMONPROCESS_H</font>
<font color="#a020f0">#define RUDIMENTS_DAEMONPROCESS_H</font>
<font color="#a020f0">#include </font><font color="#ff00ff"><rudiments/private/daemonprocessincludes.h></font>
<font color="#0000ff">// Daemons are long running processes which often detach themselves from</font>
<font color="#0000ff">// the controlling terminal and run in the background. They are frequently</font>
<font color="#0000ff">// started at boot time and run until the machine is shut down.</font>
<font color="#0000ff">//</font>
<font color="#0000ff">// Daemons typically perform "housecleaning" tasks or serve data to client</font>
<font color="#0000ff">// programs. See the server class.</font>
<font color="#a020f0">#ifdef RUDIMENTS_NAMESPACE</font>
<font color="#2e8b57"><b>namespace</b></font> rudiments {
<font color="#a020f0">#endif</font>
<font color="#2e8b57"><b>class</b></font> daemonprocessprivate;
<font color="#2e8b57"><b>class</b></font> daemonprocess {
<font color="#a52a2a"><b>public</b></font>:
daemonprocess();
<font color="#2e8b57"><b>virtual</b></font> ~daemonprocess();
<font color="#2e8b57"><b>static</b></font> <font color="#2e8b57"><b>int64_t</b></font> checkForPidFile(<font color="#2e8b57"><b>const</b></font> <font color="#2e8b57"><b>char</b></font> *filename);
<font color="#0000ff">// Checks for filename "filename" and reads the</font>
<font color="#0000ff">// process id out of it, if it exists. Returns</font>
<font color="#0000ff">// the process id on success or -1 on failure.</font>
<font color="#2e8b57"><b>static</b></font> <font color="#2e8b57"><b>bool</b></font> createPidFile(<font color="#2e8b57"><b>const</b></font> <font color="#2e8b57"><b>char</b></font> *filename,
mode_t permissions);
<font color="#0000ff">// Create's file "filename" with permissions</font>
<font color="#0000ff">// "permissions" and puts the current process</font>
<font color="#0000ff">// id in it. Note that when you delete this</font>
<font color="#0000ff">// file during shutdown you must use the full</font>
<font color="#0000ff">// pathname since the detach() method below</font>
<font color="#0000ff">// changes directories to "/". Returns true on</font>
<font color="#0000ff">// success and false on failure.</font>
<font color="#2e8b57"><b>bool</b></font> detach() <font color="#2e8b57"><b>const</b></font>;
<font color="#0000ff">// Detach from the controlling terminal and</font>
<font color="#0000ff">// process and run in the background. Also</font>
<font color="#0000ff">// change directories to "/" and set the file</font>
<font color="#0000ff">// creation mask such that all files are </font>
<font color="#0000ff">// created -rw-rw-rw and all directories </font>
<font color="#0000ff">// drwxrwxrwx.</font>
<font color="#0000ff">// These methods allow the daemon to run as a different</font>
<font color="#0000ff">// user or group than the one that started the process.</font>
<font color="#0000ff">// They have no effect unless the process is started</font>
<font color="#0000ff">// by the root user.</font>
<font color="#0000ff">//</font>
<font color="#0000ff">// These methods return 1 on success, 0 on failure and</font>
<font color="#0000ff">// -1 on error.</font>
<font color="#2e8b57"><b>int</b></font> runAsUser(<font color="#2e8b57"><b>const</b></font> <font color="#2e8b57"><b>char</b></font> *username) <font color="#2e8b57"><b>const</b></font>;
<font color="#0000ff">// Note that runAsUser() uses the passwdentry</font>
<font color="#0000ff">// class. If you are using this method in a</font>
<font color="#0000ff">// multithreaded application, you may need to</font>
<font color="#0000ff">// supply the passwdentry classes a mutex.</font>
<font color="#0000ff">// See passwdentry.h for more detail.</font>
<font color="#2e8b57"><b>int</b></font> runAsGroup(<font color="#2e8b57"><b>const</b></font> <font color="#2e8b57"><b>char</b></font> *groupname) <font color="#2e8b57"><b>const</b></font>;
<font color="#0000ff">// Note that runAsGroup() uses the groupentry</font>
<font color="#0000ff">// class. If you are using this method in a</font>
<font color="#0000ff">// multithreaded application, you may need to</font>
<font color="#0000ff">// supply the groupentry classes a mutex.</font>
<font color="#0000ff">// See groupentry.h for more detail.</font>
<font color="#2e8b57"><b>int</b></font> runAsUserId(uid_t uid) <font color="#2e8b57"><b>const</b></font>;
<font color="#2e8b57"><b>int</b></font> runAsGroupId(gid_t gid) <font color="#2e8b57"><b>const</b></font>;
<font color="#2e8b57"><b>static</b></font> <font color="#2e8b57"><b>void</b></font> handleShutDown(<font color="#2e8b57"><b>void</b></font> *shutdownfunction);
<font color="#0000ff">// This method allows you to designate a</font>
<font color="#0000ff">// function to run when the daemon is killed.</font>
<font color="#2e8b57"><b>static</b></font> <font color="#2e8b57"><b>void</b></font> handleCrash(<font color="#2e8b57"><b>void</b></font> *crashfunction);
<font color="#0000ff">// This method allows you to designate a</font>
<font color="#0000ff">// function to run if the daemon crashes.</font>
<font color="#2e8b57"><b>static</b></font> <font color="#2e8b57"><b>void</b></font> waitForChildren();
<font color="#0000ff">// This method causes the daemon to wait</font>
<font color="#0000ff">// on child processes which have exited,</font>
<font color="#0000ff">// preventing so-called "zombie" processes</font>
<font color="#0000ff">// from occurring. This method is called</font>
<font color="#0000ff">// in the constructor and is thus the default</font>
<font color="#0000ff">// behavior of this class.</font>
<font color="#2e8b57"><b>static</b></font> <font color="#2e8b57"><b>void</b></font> dontWaitForChildren();
<font color="#0000ff">// This method causes the daemon not to</font>
<font color="#0000ff">// wait on child processes which have exited.</font>
<font color="#0000ff">// Ordinarily, you'd want to wait on child</font>
<font color="#0000ff">// processes, but this interferes with the</font>
<font color="#0000ff">// behavior of WEXITSTATUS() after a call to</font>
<font color="#0000ff">// system() (and possibly other calls). This</font>
<font color="#0000ff">// method allows you to disable waiting on</font>
<font color="#0000ff">// child processes.</font>
<font color="#a020f0"> #include </font><font color="#ff00ff"><rudiments/private/daemonprocess.h></font>
};
<font color="#a020f0">#ifdef RUDIMENTS_NAMESPACE</font>
}
<font color="#a020f0">#endif</font>
<font color="#a020f0">#endif</font>
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