From 5e39ebfa909091ee318866248434595d8d41b22d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joachim=20Stro=CC=88mbergson?= <joachim@secworks.se>
Date: Tue, 21 Apr 2015 15:58:57 +0200
Subject: Added test of access to trng from SW before trying to extract data.

---
 eim/sw/trng_extractor_eim.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/eim/sw/trng_extractor_eim.c b/eim/sw/trng_extractor_eim.c
index 330c153..711ede1 100644
--- a/eim/sw/trng_extractor_eim.c
+++ b/eim/sw/trng_extractor_eim.c
@@ -134,6 +134,12 @@ int main(int argc, char *argv[])
     FILE *output = stdout;
     uint32_t data;
 
+    // Check that we have can talk to the trng.
+    if (avalanche_check() || rosc_check() || trng_check()) {
+            fprintf(stderr, "Can't properly access the trng.\n");
+            return EXIT_FAILURE;
+    }
+
     /* parse command line */
     while ((opt = getopt(argc, argv, "h?arcn:o:")) != -1) {
         switch (opt) {
-- 
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