[Dnsmasq-discuss] Dnsmasq not resolving addresses for an hour
John Knight
John.Knight at belkin.com
Fri Oct 14 02:17:49 BST 2016
Hi All,
Well, I believe I have found another issue with the function poll_resolv(). The variable last_change needs to be static. Otherwise, the difftime(statbuf.st_mtime, last_change) always is a rather large number... the number of seconds since time 0 (the initialized value of last_change at the top of the function). By making this variable static, the last_change truly becomes the elapsed time in seconds since the last change for /etc/resolv.conf. The last_change variable really represents the timestamp of when reload_servers() was called last.
To see the issue, I added a my_syslog to log that a change is detected and what the time difference is:
if (force || (statbuf.st_mtime != res->mtime))
{
res->mtime = statbuf.st_mtime;
if (difftime(statbuf.st_mtime, last_change) != 0.0)
{
my_syslog(LOG_INFO, _("change detected for %s; time difference is %f"),
res->name, difftime(statbuf.st_mtime, last_change));
last_change = statbuf.st_mtime;
latest = res;
}
}
}
Without the static for last_change variable, the time difference reported is rather large... number of seconds since epoch (0).
static time_t last_change = 0;
I added the static in the above statement at the top of the function.
John
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