rand/: Secure `rand' generator against fork problems.

[catacomb] / rand / randgen.c

diff --git a/rand/randgen.c b/rand/randgen.c
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+++ b/rand/randgen.c
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+/* -*-c-*-
+ *
+ * Pool-generation boundary machinery (Unix-specific)
+ *
+ * (c) 2016 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * Catacomb is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <unistd.h>
+
+#include "rand.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @rand_generation@ --- *
+ *
+ * Arguments:  ---
+ *
+ * Returns:    A nonzero generation number.
+ *
+ * Use:                Returns a generation number for the current process.  Each
+ *             pool has its own number.  If this matches the process number
+ *             then all is well.  If it doesn't match, then the pool needs
+ *             to be cleaned before its next use.
+ */
+
+unsigned rand_generation(void) { return (getpid()); }
+
+/*----- That's all, folks -------------------------------------------------*/