cease inefficient /dev/urandom fiddling.

Instead of reading /dev/urandom like a file (i.e. overhead / extra
syscalls, etc.), just use getrandom(2) directly, lol.

Signed-off-by: Gediminas Jakutis <gediminas@varciai.lt>

1 files changed, 5 insertions, 6 deletions

diff --git a/src/datagen.c b/src/datagen.c
index 7eab23f..98a64fe 100644
--- a/src/datagen.c
+++ b/src/datagen.c
@@ -2,12 +2,9 @@
 
 /* Copyright (C) 2020 Gediminas Jakutis */
 
-#include <unistd.h>
-#include <stddef.h>
 #include <errno.h>
-#include <stdlib.h>
 #include <string.h>
-#include <sys/types.h>
+#include <sys/random.h>
 #include "datagen.h"
 #include "defs.h"
 
@@ -18,12 +15,14 @@ struct entry_l *gen_get_array(struct stream * const in)
 	struct entry_l *ret;
 	int errn;
 
-	if (read(in->fd, &buf.val, sizeof(buf.val)) == sizeof(buf.val)) {
+	(void) in; /* lol says librin, lmao */
+
+	if (getrandom(&buf.val, sizeof(buf.val), 0ul) == sizeof(buf.val)) {
 		ret = &buf;
 	} else {
 		errn = errno;
 		ret = NULL;
-		rin_err("error reading /dev/urandom: %s", strerror(errn));
+		rin_err("error reading urandom: %s", strerror(errn));
 	}
 
 	return ret;