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[svn-r5656] Purpose:

Browse Source 
Feature Add
Description:
    Use the /dev/urandom device for random data if it's available. (That
    is stat() doesn't return a -1 when ran on it). Use random() otherwise.
Platforms tested:
    Linux, FreeBSD
This commit is contained in:
Bill Wendling 2002-06-17 15:01:17 -05:00
parent 12e0c2e474
commit 5e12a077ab
1 changed files with 38 additions and 6 deletions
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44
perform/zip_perf.c
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@ -27,11 +27,11 @@
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
/* our header files */
@ -410,6 +410,40 @@ parse_size_directive(const char *size)
return s;
}
static void
fill_with_random_data(Bytef *src, uLongf src_len)
{
register int i;
struct stat buf;
if (stat("/dev/urandom", &buf) == 0) {
int fd = open("/dev/urandom", O_RDONLY);
printf("Using /dev/urandom for random data\n");
if (fd < 0)
error(strerror(errno));
for (;;) {
ssize_t rc = read(fd, src, src_len);
if (rc == -1)
error(strerror(errno));
if (rc == src_len)
break;
src += rc;
src_len -= rc;
}
} else {
printf("Using random() for random data\n");
for (i = 0; i < src_len; ++i)
src[i] = 0xff & random();
}
}
static void
do_write_test(unsigned long file_size, unsigned long min_buf_size,
unsigned long max_buf_size)
@ -433,9 +467,7 @@ do_write_test(unsigned long file_size, unsigned long min_buf_size,
compression_time = 0.0;
if (random_test)
/* fill the buffer with random data */
for (i = 0; i < src_len; ++i)
src[i] = 0xff | (1 + (int)(255.0 * rand()/(RAND_MAX + 1.0)));
fill_with_random_data(src, src_len);
printf("Buffer size == ");
@ -464,7 +496,7 @@ do_write_test(unsigned long file_size, unsigned long min_buf_size,
/* loop to make sure we write everything out that we want to write */
for (;;) {
int rc = write(output, s_ptr, s_len);
ssize_t rc = write(output, s_ptr, s_len);
if (rc == -1)
error(strerror(errno));