util.signal: Add support for signalfd(2) on Linux
signalfd allows handling signal events using the same method as sockets,
via file descriptors. Thus all signal dispatch can go through the same
main event loop as everything else, removing need for thread-scary
signal handling where execution would just jump to the signal handler
regardless of the state of Lua, and needing to keep track of Lua
states/threads.
-- Generate util/dnsregistry.lua from IANA HTTP status code registry
if not pcall(require, "prosody.loader") then
pcall(require, "loader");
end
local xml = require "prosody.util.xml";
local registries = xml.parse(io.read("*a"), { allow_processing_instructions = true });
print("-- Source: https://www.iana.org/assignments/dns-parameters/dns-parameters.xml");
print(os.date("-- Generated on %Y-%m-%d"))
local registry_mapping = {
["dns-parameters-2"] = "classes";
["dns-parameters-4"] = "types";
["dns-parameters-6"] = "errors";
};
print("return {");
for registry in registries:childtags("registry") do
local registry_name = registry_mapping[registry.attr.id];
if registry_name then
print("\t" .. registry_name .. " = {");
for record in registry:childtags("record") do
local record_name = record:get_child_text("name");
local record_type = record:get_child_text("type");
local record_desc = record:get_child_text("description");
local record_code = tonumber(record:get_child_text("value"));
if tostring(record):lower():match("reserved") or tostring(record):lower():match("unassigned") then
record_code = nil;
end
if registry_name == "classes" and record_code then
record_type = record_desc and record_desc:match("%((%w+)%)$")
if record_type then
print(("\t\t[%q] = %d; [%d] = %q;"):format(record_type, record_code, record_code, record_type))
end
elseif registry_name == "types" and record_type and record_code then
print(("\t\t[%q] = %d; [%d] = %q;"):format(record_type, record_code, record_code, record_type))
elseif registry_name == "errors" and record_code and record_name then
print(("\t\t[%d] = %q; [%q] = %q;"):format(record_code, record_name, record_name, record_desc or record_name));
end
end
print("\t};");
end
end
print("};");