a

libc/truerand.c

@@ -0,0 +1,17 @@
+#include <u.h>
+#include <libc.h>
+
+ulong
+truerand(void)
+{
+	ulong x;
+	static int randfd = -1;
+
+	if(randfd < 0)
+		randfd = open("/dev/random", OREAD|OCEXEC);
+	if(randfd < 0)
+		sysfatal("can't open /dev/random");
+	if(read(randfd, &x, sizeof(x)) != sizeof(x))
+		sysfatal("can't read /dev/random");
+	return x;
+}