Split out rand

adsbus/rand.c

@@ -0,0 +1,22 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <assert.h>
+#include <unistd.h>
+
+#include "rand.h"
+
+static int rand_fd;
+
+void rand_init() {
+	rand_fd = open("/dev/urandom", O_RDONLY);
+	assert(rand_fd >= 0);
+}
+
+void rand_cleanup() {
+	assert(!close(rand_fd));
+}
+
+void rand_fill(void *value, size_t size) {
+	assert(read(rand_fd, value, size) == size);
+}