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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2010-06-15 14:01:31 +0300
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2010-06-15 14:02:48 +0300
commite4867287195421ed3c41e15ce292b00b1c0e3649 (patch)
tree65eb1b5b75aae14831647c8af122730dd1b8165b /tests
parenta6a67a71a26d6906c1c1fd12ea7eef9a9c9b4e2d (diff)
ubi-test: seed the random genrator in tests
Add a common seed_random_generator() and make tests use it for seeding the random generator. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'tests')
-rw-r--r--tests/ubi-tests/common.c31
-rw-r--r--tests/ubi-tests/common.h24
-rw-r--r--tests/ubi-tests/integ.c4
-rw-r--r--tests/ubi-tests/io_paral.c1
-rw-r--r--tests/ubi-tests/io_update.c1
5 files changed, 47 insertions, 14 deletions
diff --git a/tests/ubi-tests/common.c b/tests/ubi-tests/common.c
index b605dd9..05cbecc 100644
--- a/tests/ubi-tests/common.c
+++ b/tests/ubi-tests/common.c
@@ -26,8 +26,10 @@
#include <errno.h>
#include <string.h>
#include <unistd.h>
+#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
+#include <sys/time.h>
#include <fcntl.h>
#include "libubi.h"
#include "common.h"
@@ -332,3 +334,32 @@ close:
close(fd);
return -1;
}
+
+/**
+ * seed_random_generator - randomly seed the standard pseudo-random generator.
+ *
+ * This helper function seeds the standard libc pseudo-random generator with a
+ * more or less random value to make sure the 'rand()' call does not return the
+ * same sequence every time UBI utilities run. Returns the random seed in case
+ * of success and a %-1 in case of error.
+ */
+int seed_random_generator(void)
+{
+ struct timeval tv;
+ struct timezone tz;
+ int seed;
+
+ /*
+ * Just assume that a combination of the PID + current time is a
+ * reasonably random number.
+ */
+ if (gettimeofday(&tv, &tz))
+ return -1;
+
+ seed = (unsigned int)tv.tv_sec;
+ seed += (unsigned int)tv.tv_usec;
+ seed *= getpid();
+ seed %= INT_MAX;
+ srand(seed);
+ return seed;
+}
diff --git a/tests/ubi-tests/common.h b/tests/ubi-tests/common.h
index 859af14..88e963f 100644
--- a/tests/ubi-tests/common.h
+++ b/tests/ubi-tests/common.h
@@ -90,19 +90,21 @@ extern "C" {
(s)/5-3, (s)/5-2, (s)/5-1, (s)/5+1, (s)/5+2, (s)/5+3, (s)-17, (s)-9, \
(s)-8, (s)-6, (s)-4, (s)-1, (s)};
+extern int seed_random_generator(void);
+
extern void __errmsg(const char *test, const char *func, int line,
const char *fmt, ...);
-void __failed(const char *test, const char *func, int line,
- const char *failed);
-int __initial_check(const char *test, int argc, char * const argv[]);
-int __check_volume(libubi_t libubi, struct ubi_dev_info *dev_info,
- const char *test, const char *func, int line, int vol_id,
- const struct ubi_mkvol_request *req);
-int __check_vol_patt(libubi_t libubi, const char *test, const char *func,
- int line, const char *node, uint8_t byte);
-int __update_vol_patt(libubi_t libubi, const char *test, const char *func,
- int line, const char *node, long long bytes,
- uint8_t byte);
+extern void __failed(const char *test, const char *func, int line,
+ const char *failed);
+extern int __initial_check(const char *test, int argc, char * const argv[]);
+extern int __check_volume(libubi_t libubi, struct ubi_dev_info *dev_info,
+ const char *test, const char *func, int line,
+ int vol_id, const struct ubi_mkvol_request *req);
+extern int __check_vol_patt(libubi_t libubi, const char *test, const char *func,
+ int line, const char *node, uint8_t byte);
+extern int __update_vol_patt(libubi_t libubi, const char *test, const char *func,
+ int line, const char *node, long long bytes,
+ uint8_t byte);
#ifdef __cplusplus
}
diff --git a/tests/ubi-tests/integ.c b/tests/ubi-tests/integ.c
index e0e8bee..f293444 100644
--- a/tests/ubi-tests/integ.c
+++ b/tests/ubi-tests/integ.c
@@ -731,10 +731,8 @@ int main(int argc,char *argv[])
return 1;
}
- initial_seed = getpid();
+ next_seed = initial_seed = seed_random_generator();
printf("Initial seed = %u\n", (unsigned) initial_seed);
- next_seed = initial_seed;
- srand(initial_seed);
load_ubi();
libubi = libubi_open();
diff --git a/tests/ubi-tests/io_paral.c b/tests/ubi-tests/io_paral.c
index 3ceda95..9754a0d 100644
--- a/tests/ubi-tests/io_paral.c
+++ b/tests/ubi-tests/io_paral.c
@@ -233,6 +233,7 @@ int main(int argc, char * const argv[])
int i, ret;
pthread_t threads[THREADS_NUM];
+ seed_random_generator();
if (initial_check(argc, argv))
return 1;
diff --git a/tests/ubi-tests/io_update.c b/tests/ubi-tests/io_update.c
index 3b8169d..0259446 100644
--- a/tests/ubi-tests/io_update.c
+++ b/tests/ubi-tests/io_update.c
@@ -267,6 +267,7 @@ remove:
int main(int argc, char * const argv[])
{
+ seed_random_generator();
if (initial_check(argc, argv))
return 1;