plugins/mod_posix.lua

   1
   2 local want_pposix_version = "0.3.0";
   3
   4 local pposix = assert(require "util.pposix");
   5 if pposix._VERSION ~= want_pposix_version then module:log("warn", "Unknown version (%s) of binary pposix module, expected %s", tostring(pposix._VERSION), want_pposix_version); end
   6
   7 local signal = select(2, pcall(require, "util.signal"));
   8 if type(signal) == "string" then
   9         module:log("warn", "Couldn't load signal library, won't respond to SIGTERM");
  10 end
  11
  12 local config_get = require "core.configmanager".get;
  13 local logger_set = require "util.logger".setwriter;
  14
  15 module.host = "*"; -- we're a global module
  16
  17 -- Don't even think about it!
  18 module:add_event_hook("server-starting", function ()
  19                 if pposix.getuid() == 0 and not config_get("*", "core", "run_as_root") then
  20                         module:log("error", "Danger, Will Robinson! Prosody doesn't need to be run as root, so don't do it!");
  21                         module:log("error", "For more information on running Prosody as root, see http://prosody.im/doc/root");
  22                         _G.prosody_shutdown("Refusing to run as root");
  23                 end
  24         end);
  25
  26 local pidfile_written;
  27
  28 local function remove_pidfile()
  29         if pidfile_written then
  30                 os.remove(pidfile_written);
  31                 pidfile_written = nil;
  32         end
  33 end
  34
  35 local function write_pidfile()
  36         if pidfile_written then
  37                 remove_pidfile();
  38         end
  39         local pidfile = config_get("*", "core", "pidfile");
  40         if pidfile then
  41                 local pf, err = io.open(pidfile, "w+");
  42                 if not pf then
  43                         module:log("error", "Couldn't write pidfile; %s", err);
  44                 else
  45                         pf:write(tostring(pposix.getpid()));
  46                         pf:close();
  47                         pidfile_written = pidfile;
  48                 end
  49         end
  50 end
  51
  52 local syslog_opened
  53 function syslog_sink_maker(config)
  54         if not syslog_opened then
  55                 pposix.syslog_open("prosody");
  56                 syslog_opened = true;
  57         end
  58         local syslog, format = pposix.syslog_log, string.format;
  59         return function (name, level, message, ...)
  60                         if ... then
  61                                 syslog(level, format(message, ...));
  62                         else
  63                                 syslog(level, message);
  64                         end
  65                 end;
  66 end
  67 require "core.loggingmanager".register_sink_type("syslog", syslog_sink_maker);
  68
  69 if not config_get("*", "core", "no_daemonize") then
  70         local function daemonize_server()
  71                 local ok, ret = pposix.daemonize();
  72                 if not ok then
  73                         module:log("error", "Failed to daemonize: %s", ret);
  74                 elseif ret and ret > 0 then
  75                         os.exit(0);
  76                 else
  77                         module:log("info", "Successfully daemonized to PID %d", pposix.getpid());
  78                         write_pidfile();
  79                 end
  80         end
  81         module:add_event_hook("server-starting", daemonize_server);
  82 else
  83         -- Not going to daemonize, so write the pid of this process
  84         write_pidfile();
  85 end
  86
  87 module:add_event_hook("server-stopped", remove_pidfile);
  88
  89 -- Set signal handlers
  90 if signal.signal then
  91         signal.signal("SIGTERM", function ()
  92                 module:log("warn", "Received SIGTERM");
  93                 _G.unlock_globals();
  94                 _G.prosody_shutdown("Received SIGTERM");
  95                 _G.lock_globals();
  96         end);
  97
  98         signal.signal("SIGHUP", function ()
  99                 module:log("info", "Received SIGHUP");
 100                 _G.prosody_reload_config();
 101                 _G.prosody_reopen_logfiles();
 102         end);
 103 end