From: Sami Kerola <kerolasa@iki.fi>
Date: Sun, 30 Jul 2017 11:33:12 +0000 (+0100)
Subject: libuuid: use access(2) when checking /dev/random availability
X-Git-Tag: v2.31-rc1~151
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=30124e172a8beef96bde3b6c0844d9aaea801ee8;p=thirdparty%2Futil-linux.git

libuuid: use access(2) when checking /dev/random availability

The access(2) is more lightwight than stat(2), and tells whether random
device(s) can be read or not, unlike the earlier stat() call.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
---

diff --git a/libuuid/src/gen_uuid.c b/libuuid/src/gen_uuid.c
index 21e361293e..7dafcaeedd 100644
--- a/libuuid/src/gen_uuid.c
+++ b/libuuid/src/gen_uuid.c
@@ -534,9 +534,8 @@ void uuid_generate_random(uuid_t out)
  */
 static int have_random_source(void)
 {
-	struct stat s;
-
-	return (!stat("/dev/random", &s) || !stat("/dev/urandom", &s));
+	return (access("/dev/random", R_OK) == 0 ||
+		access("/dev/urandom", R_OK) == 0);
 }