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cangen: set seed value for pseudo random numbers 

As pointed out by Andre Naujoks the pseudo random generator should be
initialized with a seed to prevend this ugly behaviour:

$ ./cangen vcan2 -v & ./cangen vcan1 -v
[1] 5995
  vcan2  567#69.98.3C.64.73.48
  vcan1  567#69.98.3C.64.73.48
  vcan2  451#4A.94.E8.2A.EC.58.55.62
  vcan1  451#4A.94.E8.2A.EC.58.55.62
  vcan2  729#BA.58.1B.3D.AB.D7.7E.50
  vcan1  729#BA.58.1B.3D.AB.D7.7E.50
(..)

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
pull/7/head
Oliver Hartkopp 2011-01-19 17:35:37 +00:00
parent 7ef581fec0
commit d262a552bb
1 changed files with 5 additions and 0 deletions
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cangen.c
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@ -155,6 +155,11 @@ int main(int argc, char **argv)
struct ifreq ifr; struct ifreq ifr;
struct timespec ts; struct timespec ts;
struct timeval now;
/* set seed value for pseudo random numbers */
gettimeofday(&now, NULL);
srandom(now.tv_usec);
signal(SIGTERM, sigterm); signal(SIGTERM, sigterm);
signal(SIGHUP, sigterm); signal(SIGHUP, sigterm);