DEV: udp: add an optional argument to set the prng seed

This will help reproduce certain sequences that were observed.

diff --git a/dev/udp/udp-perturb.c b/dev/udp/udp-perturb.c
index b6432575b821ce4fad2fc06dd04a2dfcd1640363..824628d367a17fd661a314083b5f6f94dfc5a4ff 100644 (file)
--- a/dev/udp/udp-perturb.c
+++ b/dev/udp/udp-perturb.c
@@ -420,7 +420,7 @@ int main(int argc, char **argv)
        err.msg = malloc(err.size);
 
        if (argc < 3)
-               die(1, "Usage: %s [<laddr>:]<lport> [<saddr>:]<sport> [rand_rate%%]\n", argv[0]);
+               die(1, "Usage: %s [<laddr>:]<lport> [<saddr>:]<sport> [rand_rate%% [seed]]\n", argv[0]);
 
        if (addr_to_ss(argv[1], &frt_addr, &err) < 0)
                die(1, "parsing listen address: %s\n", err.msg);
@@ -431,6 +431,9 @@ int main(int argc, char **argv)
        if (argc > 3)
                rand_rate = atoi(argv[3]);
 
+       if (argc > 4)
+               prng_state = atol(argv[4]);
+
        pfd = calloc(sizeof(struct pollfd), MAXCONN + 1);
        if (!pfd)
                die(1, "out of memory\n");