From: Yann Collet <yann.collet.73@gmail.com>
Date: Thu, 16 Jun 2016 11:38:10 +0000 (+0200)
Subject: better seed randomization for systems with poor clock() resolutation
X-Git-Tag: v0.7.0^2~6
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3f01c8833f237a17cb44e1f65fa63bd67fabd0d8;p=thirdparty%2Fzstd.git

better seed randomization for systems with poor clock() resolutation
---

diff --git a/programs/fuzzer.c b/programs/fuzzer.c
index 42d3640da..d1dfe51e8 100644
--- a/programs/fuzzer.c
+++ b/programs/fuzzer.c
@@ -847,7 +847,12 @@ int main(int argc, const char** argv)
     /* Get Seed */
     DISPLAY("Starting zstd tester (%i-bits, %s)\n", (int)(sizeof(size_t)*8), ZSTD_VERSION_STRING);
 
-    if (!seedset) seed = (U32)(clock() % 10000);
+    if (!seedset) {
+        time_t const t = time(NULL);
+        U32 const h = XXH32(&t, sizeof(t), 1);
+        seed = h % 10000;
+    }
+
     DISPLAY("Seed = %u\n", seed);
     if (proba!=FUZ_compressibility_default) DISPLAY("Compressibility : %u%%\n", proba);