first draft

memunlock.c

@@ -0,0 +1,28 @@
+/*
+ * $smu-mark$
+ * $name: memunlock.c$
+ * $other_author: Alfonso De Gregorio <dira@speedcom.it>
+ * $other_copyright: Copyright (C) 1999 by Alfonso De Gregorio
+ * $license: This software is under GPL version 2 of license$
+ * $date: Fri Nov  5 11:55:48 MET 1999$
+ * $rev: 2$
+ */
+
+#include <unistd.h>
+#include <sys/mman.h>
+
+int memunlock(char *addr, size_t size)
+{
+#ifdef _POSIX_MEMLOCK_RANGE
+	unsigned long    page_offset, page_size;
+
+	page_size = sysconf(_SC_PAGESIZE);
+	page_offset = (unsigned long) addr % page_size;
+
+	addr -= page_offset; 
+	size += page_offset;
+
+	return ( munlock(addr, size) ); 
+#endif
+	return (-1);
+}