From bd273b9f1364556859aeea598a933fac76741cb8 Mon Sep 17 00:00:00 2001
From: ziggurat29 <dev@ziggurat29.com>
Date: Thu, 24 Mar 2016 11:43:45 -0500
Subject: [PATCH] minor; intialize buffer to well-known patter to make it easy
to see if it was truly filled with random data
---
examples/random/random_main.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/examples/random/random_main.c b/examples/random/random_main.c
index ae3c48207..d272a9f8a 100644
--- a/examples/random/random_main.c
+++ b/examples/random/random_main.c
@@ -41,6 +41,7 @@
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <debug.h>
@@ -94,13 +95,17 @@ int rand_main(int argc, char *argv[])
nsamples = atoi(argv[1]);
}
- /* Clip the numer of samples to the configured buffer size */
+ /* Clip the number of samples to the configured buffer size */
if (nsamples > CONFIG_EXAMPLES_MAXSAMPLES)
{
nsamples = CONFIG_EXAMPLES_MAXSAMPLES;
}
+ /* fill buffer to make it super-clear as to what has and has not been written */
+
+ memset(buffer,0xcc,sizeof(buffer));
+
/* Open /dev/random */
fd = open("/dev/random", O_RDONLY);
@@ -114,6 +119,7 @@ int rand_main(int argc, char *argv[])
/* Read the requested number of samples */
printf("Reading %d random numbers\n", nsamples);
+ fflush(stdout);
nread = read(fd, buffer, nsamples * sizeof(uint32_t));
if (nread < 0)
{
@@ -122,6 +128,12 @@ int rand_main(int argc, char *argv[])
(void)close(fd);
exit(EXIT_FAILURE);
}
+ if (nread != nsamples * sizeof(uint32_t))
+ {
+ fprintf(stderr, "ERROR: Read from /dev/randon only produced %d bytes\n", nread);
+ (void)close(fd);
+ exit(EXIT_FAILURE);
+ }
/* Dump the sample buffer */
--
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