plugins/mod_posix.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9
  10 local want_pposix_version = "0.3.1";
  11
  12 local pposix = assert(require "util.pposix");
  13 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
  14
  15 local signal = select(2, pcall(require, "util.signal"));
  16 if type(signal) == "string" then
  17         module:log("warn", "Couldn't load signal library, won't respond to SIGTERM");
  18 end
  19
  20 local logger_set = require "util.logger".setwriter;
  21
  22 local prosody = _G.prosody;
  23
  24 module.host = "*"; -- we're a global module
  25
  26 -- Don't even think about it!
  27 module:add_event_hook("server-starting", function ()
  28                 if pposix.getuid() == 0 and not module:get_option("run_as_root") then
  29                         module:log("error", "Danger, Will Robinson! Prosody doesn't need to be run as root, so don't do it!");
  30                         module:log("error", "For more information on running Prosody as root, see http://prosody.im/doc/root");
  31                         prosody.shutdown("Refusing to run as root");
  32                 end
  33         end);
  34
  35 local pidfile_written;
  36
  37 local function remove_pidfile()
  38         if pidfile_written then
  39                 os.remove(pidfile_written);
  40                 pidfile_written = nil;
  41         end
  42 end
  43
  44 local function write_pidfile()
  45         if pidfile_written then
  46                 remove_pidfile();
  47         end
  48         local pidfile = module:get_option("pidfile");
  49         if pidfile then
  50                 local pf, err = io.open(pidfile, "w+");
  51                 if not pf then
  52                         module:log("error", "Couldn't write pidfile; %s", err);
  53                 else
  54                         pf:write(tostring(pposix.getpid()));
  55                         pf:close();
  56                         pidfile_written = pidfile;
  57                 end
  58         end
  59 end
  60
  61 local syslog_opened
  62 function syslog_sink_maker(config)
  63         if not syslog_opened then
  64                 pposix.syslog_open("prosody");
  65                 syslog_opened = true;
  66         end
  67         local syslog, format = pposix.syslog_log, string.format;
  68         return function (name, level, message, ...)
  69                         if ... then
  70                                 syslog(level, format(message, ...));
  71                         else
  72                                 syslog(level, message);
  73                         end
  74                 end;
  75 end
  76 require "core.loggingmanager".register_sink_type("syslog", syslog_sink_maker);
  77
  78 if not module:get_option("no_daemonize") then
  79         local function daemonize_server()
  80                 local ok, ret = pposix.daemonize();
  81                 if not ok then
  82                         module:log("error", "Failed to daemonize: %s", ret);
  83                 elseif ret and ret > 0 then
  84                         os.exit(0);
  85                 else
  86                         module:log("info", "Successfully daemonized to PID %d", pposix.getpid());
  87                         write_pidfile();
  88                 end
  89         end
  90         module:add_event_hook("server-starting", daemonize_server);
  91 else
  92         -- Not going to daemonize, so write the pid of this process
  93         write_pidfile();
  94 end
  95
  96 module:add_event_hook("server-stopped", remove_pidfile);
  97
  98 -- Set signal handlers
  99 if signal.signal then
 100         signal.signal("SIGTERM", function ()
 101                 module:log("warn", "Received SIGTERM");
 102                 prosody.unlock_globals();
 103                 prosody.shutdown("Received SIGTERM");
 104                 prosody.lock_globals();
 105         end);
 106
 107         signal.signal("SIGHUP", function ()
 108                 module:log("info", "Received SIGHUP");
 109                 prosody.reload_config();
 110                 prosody.reopen_logfiles();
 111         end);
 112 end