From 4e37713af46f289eac21ca24d2e7d50aed014237 Mon Sep 17 00:00:00 2001 From: Brian Norris Date: Fri, 2 Dec 2011 09:46:12 -0800 Subject: nandtest: seed random generator with time If a seed is not provided via --seed, we use the default rand() values, which produces the same sequence of values every run. Since this is undesirable, we should choose a random seed via the current time(). Note that this patch moves the srand() until after all the initial options processing. Signed-off-by: Brian Norris Signed-off-by: Artem Bityutskiy --- nandtest.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/nandtest.c b/nandtest.c index b3aacaf..0187b87 100644 --- a/nandtest.c +++ b/nandtest.c @@ -140,6 +140,8 @@ int main(int argc, char **argv) uint32_t offset = 0; uint32_t length = -1; + seed = time(NULL); + for (;;) { static const char *short_options="hkl:mo:p:s:"; static const struct option long_options[] = { @@ -173,7 +175,6 @@ int main(int argc, char **argv) case 's': seed = atol(optarg); - srand(seed); break; case 'p': @@ -244,6 +245,8 @@ int main(int argc, char **argv) printf("Bad blocks : %d\n", oldstats.badblocks); printf("BBT blocks : %d\n", oldstats.bbtblocks); + srand(seed); + for (pass = 0; pass < nr_passes; pass++) { loff_t test_ofs; -- cgit v1.2.3