1 files changed, 34 insertions, 0 deletions
diff --git a/maildrop/exittrap.h b/maildrop/exittrap.h
new file mode 100644
index 0000000..e73571e
--- /dev/null
+++ b/maildrop/exittrap.h
@@ -0,0 +1,34 @@
+#ifndef	exittrap_h
+#define	exittrap_h
+
+
+#include	"config.h"
+
+//////////////////////////////////////////////////////////////////////////
+//
+// ExitTrap implements exit traps - cleanup functions that must be called
+// in case of an abnormal program termination.
+//
+// This class does NOT do anything like trap signals, etcetera.  The main
+// program should do that, and call onexit() in order to call the cleanup()
+// virtual function.
+//
+//////////////////////////////////////////////////////////////////////////
+
+class ExitTrap {
+
+	ExitTrap	*next, *prev;
+	virtual void	cleanup()=0;
+	virtual void	forked()=0;
+	int	callcleanup;
+protected:
+	void	destroying() { callcleanup=0; }
+	void	constructed() { callcleanup=1; }
+public:
+	ExitTrap();
+	virtual ~ExitTrap();
+
+static	void	onexit();
+static	void	onfork();
+} ;
+#endif