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minor; intialize buffer to well-known patter to make it easy to see if it was truly filled with random data

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This commit is contained in:
ziggurat29 2016-03-24 11:43:45 -05:00
parent badbb3ad9a
commit bd273b9f13
1 changed files with 13 additions and 1 deletions
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14
examples/random/random_main.c
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@ -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 */