1 files changed, 30 insertions, 0 deletions
diff --git a/maildrop/filelock.h b/maildrop/filelock.h
new file mode 100644
index 0000000..3c16db2
--- /dev/null
+++ b/maildrop/filelock.h
@@ -0,0 +1,30 @@
+#ifndef	filelock_h
+#define	filelock_h
+
+
+#include	"exittrap.h"
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Encapsulate the flock() system call.  By encapsulating the system call
+// in a class, this allows automatic cleanup if, for some reason, an
+// exception is thrown while a lock is being held.
+//
+/////////////////////////////////////////////////////////////////////////////
+
+class	FileLock : public ExitTrap {
+
+	void	cleanup();
+	void	forked();
+
+	int	fd;
+public:
+	FileLock();
+	virtual ~FileLock();
+	void	Lock(const char *);
+	void	UnLock();
+
+static	void	do_filelock(int);
+} ;
+
+#endif