mod_posix: Move everything to util.startup
This allows greater control over the order of events.
Notably, the internal ordering between daemonization, initialization of
libunbound and setup of signal handling is sensitive.
libunbound starts a separate thread for processing DNS requests.
If this thread is started before signal handling has been set up, it
will not inherit the signal handlers and instead behave as it would have
before signal handlers were set up, i.e. cause the whole process to
immediately exit.
libunbound is usually initialized on the first DNS request, usually
triggered by an outgoing s2s connection attempt.
If daemonization happens before signals have been set up, signals may
not be processed at all.
local math_abs = math.abs;
local math_ceil = math.ceil;
local math_floor = math.floor;
local math_log = math.log;
local math_max = math.max;
local math_min = math.min;
local unpack = table.unpack;
local large = {
"k", 1000,
"M", 1000000,
"G", 1000000000,
"T", 1000000000000,
"P", 1000000000000000,
"E", 1000000000000000000,
"Z", 1000000000000000000000,
"Y", 1000000000000000000000000,
}
local small = {
"m", 0.001,
"μ", 0.000001,
"n", 0.000000001,
"p", 0.000000000001,
"f", 0.000000000000001,
"a", 0.000000000000000001,
"z", 0.000000000000000000001,
"y", 0.000000000000000000000001,
}
local binary = {
"Ki", 2^10,
"Mi", 2^20,
"Gi", 2^30,
"Ti", 2^40,
"Pi", 2^50,
"Ei", 2^60,
"Zi", 2^70,
"Yi", 2^80,
}
local function adjusted_unit(n, b)
local round = math_floor;
local prefixes = large;
local logbase = 1000;
if b == 'b' then
prefixes = binary;
logbase = 1024;
elseif n < 1 then
prefixes = small;
round = math_ceil;
end
local m = math_max(0, math_min(8, round(math_abs(math_log(math_abs(n), logbase)))));
local prefix, multiplier = unpack(prefixes, m * 2-1, m*2);
return multiplier or 1, prefix;
end
-- n: number, the number to format
-- unit: string, the base unit
-- b: optional enum 'b', thousands base
local function format(n, unit, b) --> string
local fmt = "%.3g %s%s";
if n == 0 then
return fmt:format(n, "", unit);
end
local multiplier, prefix = adjusted_unit(n, b);
return fmt:format(n / multiplier, prefix or "", unit);
end
return {
adjust = adjusted_unit;
format = format;
};