prosody
9806fac994f8
plugins/mod_posix.lua

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plugins/mod_posix.lua @ 2445:9806fac994f8

mod_posix: Lock pidfile when in use, shut down if we can't write or lock the pidfile
author Matthew Wild <mwild1@gmail.com>
date Sun, 10 Jan 2010 23:49:38 +0000
parent 2440:11e3d16a128f
child 2455:0b3184f3c9e4
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9
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10 local want_pposix_version = "0.3.2";
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11
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12 local pposix = assert(require "util.pposix");
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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
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15 local signal = select(2, pcall(require, "util.signal"));
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16 if type(signal) == "string" then
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17 module:log("warn", "Couldn't load signal library, won't respond to SIGTERM");
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18 end
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19
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20 local logger_set = require "util.logger".setwriter;
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21
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22 local lfs = require "lfs";
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23
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24 local prosody = _G.prosody;
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25
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26 module.host = "*"; -- we're a global module
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27
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28 local umask = module:get_option("umask") or "027";
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29 pposix.umask(umask);
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30
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31 -- Allow switching away from root, some people like strange ports.
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32 module:add_event_hook("server-started", function ()
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33 local uid = module:get_option("setuid");
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34 local gid = module:get_option("setgid");
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35 if gid then
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36 local success, msg = pposix.setgid(gid);
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37 if success then
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38 module:log("debug", "Changed group to "..gid.." successfully.");
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39 else
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40 module:log("error", "Failed to change group to "..gid..". Error: "..msg);
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41 prosody.shutdown("Failed to change group to "..gid);
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42 end
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43 end
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44 if uid then
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45 local success, msg = pposix.setuid(uid);
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46 if success then
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47 module:log("debug", "Changed user to "..uid.." successfully.");
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48 else
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49 module:log("error", "Failed to change user to "..uid..". Error: "..msg);
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50 prosody.shutdown("Failed to change user to "..uid);
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51 end
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52 end
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53 end);
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54
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55 -- Don't even think about it!
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56 module:add_event_hook("server-starting", function ()
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57 local suid = module:get_option("setuid");
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58 if not suid or suid == 0 or suid == "root" then
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59 if pposix.getuid() == 0 and not module:get_option("run_as_root") then
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60 module:log("error", "Danger, Will Robinson! Prosody doesn't need to be run as root, so don't do it!");
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61 module:log("error", "For more information on running Prosody as root, see http://prosody.im/doc/root");
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62 prosody.shutdown("Refusing to run as root");
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63 end
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64 end
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65 end);
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66
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67 local pidfile;
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68 local pidfile_handle;
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69
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70 local function remove_pidfile()
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71 if pidfile_handle then
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72 pidfile_handle:close();
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73 os.remove(pidfile);
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74 pidfile, pidfile_handle = nil, nil;
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75 end
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76 end
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77
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78 local function write_pidfile()
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79 if pidfile_handle then
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80 remove_pidfile();
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81 end
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82 pidfile = module:get_option("pidfile");
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83 if pidfile then
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84 pidfile_handle, err = io.open(pidfile, "a+");
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85 if not pidfile_handle then
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86 module:log("error", "Couldn't write pidfile at %s; %s", pidfile, err);
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87 prosody.shutdown("Couldn't write pidfile");
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88 else
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89 if not lfs.lock(pidfile_handle, "w") then -- Exclusive lock
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90 local other_pid = pidfile_handle:read("*a");
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91 module:log("error", "Another Prosody instance seems to be running with PID %s, quitting", other_pid);
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92 pidfile_handle = nil;
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93 prosody.shutdown("Prosody already running");
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94 else
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95 pidfile_handle:write(tostring(pposix.getpid()));
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96 pidfile_handle:flush();
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97 end
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98 end
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99 end
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100 end
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101
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102 local syslog_opened
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103 function syslog_sink_maker(config)
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104 if not syslog_opened then
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105 pposix.syslog_open("prosody");
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106 syslog_opened = true;
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107 end
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108 local syslog, format = pposix.syslog_log, string.format;
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109 return function (name, level, message, ...)
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110 if ... then
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111 syslog(level, format(message, ...));
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112 else
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113 syslog(level, message);
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114 end
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115 end;
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116 end
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117 require "core.loggingmanager".register_sink_type("syslog", syslog_sink_maker);
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118
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119 local daemonize = module:get_option("daemonize");
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120 if daemonize == nil then
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121 local no_daemonize = module:get_option("no_daemonize"); --COMPAT w/ 0.5
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122 daemonize = not no_daemonize;
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parents: 2073
diff changeset
123 if no_daemonize ~= nil then
c59c8f3ec645 mod_posix: Log warning when no_daemonize is used, and instruct on how to update config
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parents: 2073
diff changeset
124 module:log("warn", "The 'no_daemonize' option is now replaced by 'daemonize'");
c59c8f3ec645 mod_posix: Log warning when no_daemonize is used, and instruct on how to update config
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parents: 2073
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125 module:log("warn", "Update your config from 'no_daemonize = %s' to 'daemonize = %s'", tostring(no_daemonize), tostring(daemonize));
c59c8f3ec645 mod_posix: Log warning when no_daemonize is used, and instruct on how to update config
Matthew Wild <mwild1@gmail.com>
parents: 2073
diff changeset
126 end
2073
72784ce0c0e0 mod_posix: Switch config option to 'daemonize', fall back to 'no_daemonize' if not set, default behaviour remains the same... daemonize if mod_posix is loaded
Matthew Wild <mwild1@gmail.com>
parents: 1712
diff changeset
127 end
72784ce0c0e0 mod_posix: Switch config option to 'daemonize', fall back to 'no_daemonize' if not set, default behaviour remains the same... daemonize if mod_posix is loaded
Matthew Wild <mwild1@gmail.com>
parents: 1712
diff changeset
128
72784ce0c0e0 mod_posix: Switch config option to 'daemonize', fall back to 'no_daemonize' if not set, default behaviour remains the same... daemonize if mod_posix is loaded
Matthew Wild <mwild1@gmail.com>
parents: 1712
diff changeset
129 if daemonize then
587
43f509a1519a Add mod_posix, fixes #5
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
130 local function daemonize_server()
43f509a1519a Add mod_posix, fixes #5
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
131 local ok, ret = pposix.daemonize();
43f509a1519a Add mod_posix, fixes #5
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parents:
diff changeset
132 if not ok then
1062
f9a1ac50782b mod_posix: Fix calls to log() (replace with module:log) and make some global accesses explicit
Matthew Wild <mwild1@gmail.com>
parents: 1061
diff changeset
133 module:log("error", "Failed to daemonize: %s", ret);
587
43f509a1519a Add mod_posix, fixes #5
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parents:
diff changeset
134 elseif ret and ret > 0 then
43f509a1519a Add mod_posix, fixes #5
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
135 os.exit(0);
43f509a1519a Add mod_posix, fixes #5
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
136 else
1062
f9a1ac50782b mod_posix: Fix calls to log() (replace with module:log) and make some global accesses explicit
Matthew Wild <mwild1@gmail.com>
parents: 1061
diff changeset
137 module:log("info", "Successfully daemonized to PID %d", pposix.getpid());
991
cd0d75de8345 mod_posix: Allow logging and pidfile options to take effect without needing to daemonize. Add the ability to catch SIGTERM.
Matthew Wild <mwild1@gmail.com>
parents: 735
diff changeset
138 write_pidfile();
587
43f509a1519a Add mod_posix, fixes #5
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
139 end
43f509a1519a Add mod_posix, fixes #5
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
140 end
43f509a1519a Add mod_posix, fixes #5
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
141 module:add_event_hook("server-starting", daemonize_server);
991
cd0d75de8345 mod_posix: Allow logging and pidfile options to take effect without needing to daemonize. Add the ability to catch SIGTERM.
Matthew Wild <mwild1@gmail.com>
parents: 735
diff changeset
142 else
1032
409f22d0430f mod_posix: Remove pidfile on exit
Matthew Wild <mwild1@gmail.com>
parents: 991
diff changeset
143 -- Not going to daemonize, so write the pid of this process
991
cd0d75de8345 mod_posix: Allow logging and pidfile options to take effect without needing to daemonize. Add the ability to catch SIGTERM.
Matthew Wild <mwild1@gmail.com>
parents: 735
diff changeset
144 write_pidfile();
587
43f509a1519a Add mod_posix, fixes #5
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
145 end
991
cd0d75de8345 mod_posix: Allow logging and pidfile options to take effect without needing to daemonize. Add the ability to catch SIGTERM.
Matthew Wild <mwild1@gmail.com>
parents: 735
diff changeset
146
1032
409f22d0430f mod_posix: Remove pidfile on exit
Matthew Wild <mwild1@gmail.com>
parents: 991
diff changeset
147 module:add_event_hook("server-stopped", remove_pidfile);
409f22d0430f mod_posix: Remove pidfile on exit
Matthew Wild <mwild1@gmail.com>
parents: 991
diff changeset
148
1118
239d4362a040 mod_posix: Reload the config and reopen log files on SIGHUP
Matthew Wild <mwild1@gmail.com>
parents: 1092
diff changeset
149 -- Set signal handlers
991
cd0d75de8345 mod_posix: Allow logging and pidfile options to take effect without needing to daemonize. Add the ability to catch SIGTERM.
Matthew Wild <mwild1@gmail.com>
parents: 735
diff changeset
150 if signal.signal then
cd0d75de8345 mod_posix: Allow logging and pidfile options to take effect without needing to daemonize. Add the ability to catch SIGTERM.
Matthew Wild <mwild1@gmail.com>
parents: 735
diff changeset
151 signal.signal("SIGTERM", function ()
1118
239d4362a040 mod_posix: Reload the config and reopen log files on SIGHUP
Matthew Wild <mwild1@gmail.com>
parents: 1092
diff changeset
152 module:log("warn", "Received SIGTERM");
1238
f4c08caca3e7 mod_posix: Use global prosody object
Matthew Wild <mwild1@gmail.com>
parents: 1119
diff changeset
153 prosody.unlock_globals();
f4c08caca3e7 mod_posix: Use global prosody object
Matthew Wild <mwild1@gmail.com>
parents: 1119
diff changeset
154 prosody.shutdown("Received SIGTERM");
f4c08caca3e7 mod_posix: Use global prosody object
Matthew Wild <mwild1@gmail.com>
parents: 1119
diff changeset
155 prosody.lock_globals();
991
cd0d75de8345 mod_posix: Allow logging and pidfile options to take effect without needing to daemonize. Add the ability to catch SIGTERM.
Matthew Wild <mwild1@gmail.com>
parents: 735
diff changeset
156 end);
1118
239d4362a040 mod_posix: Reload the config and reopen log files on SIGHUP
Matthew Wild <mwild1@gmail.com>
parents: 1092
diff changeset
157
239d4362a040 mod_posix: Reload the config and reopen log files on SIGHUP
Matthew Wild <mwild1@gmail.com>
parents: 1092
diff changeset
158 signal.signal("SIGHUP", function ()
239d4362a040 mod_posix: Reload the config and reopen log files on SIGHUP
Matthew Wild <mwild1@gmail.com>
parents: 1092
diff changeset
159 module:log("info", "Received SIGHUP");
1238
f4c08caca3e7 mod_posix: Use global prosody object
Matthew Wild <mwild1@gmail.com>
parents: 1119
diff changeset
160 prosody.reload_config();
f4c08caca3e7 mod_posix: Use global prosody object
Matthew Wild <mwild1@gmail.com>
parents: 1119
diff changeset
161 prosody.reopen_logfiles();
1118
239d4362a040 mod_posix: Reload the config and reopen log files on SIGHUP
Matthew Wild <mwild1@gmail.com>
parents: 1092
diff changeset
162 end);
2332
7772dde4010b mod_posix: Catch SIGINT
Matthew Wild <mwild1@gmail.com>
parents: 2074
diff changeset
163
7772dde4010b mod_posix: Catch SIGINT
Matthew Wild <mwild1@gmail.com>
parents: 2074
diff changeset
164 signal.signal("SIGINT", function ()
7772dde4010b mod_posix: Catch SIGINT
Matthew Wild <mwild1@gmail.com>
parents: 2074
diff changeset
165 module:log("info", "Received SIGINT");
7772dde4010b mod_posix: Catch SIGINT
Matthew Wild <mwild1@gmail.com>
parents: 2074
diff changeset
166 prosody.unlock_globals();
7772dde4010b mod_posix: Catch SIGINT
Matthew Wild <mwild1@gmail.com>
parents: 2074
diff changeset
167 prosody.shutdown("Received SIGINT");
7772dde4010b mod_posix: Catch SIGINT
Matthew Wild <mwild1@gmail.com>
parents: 2074
diff changeset
168 prosody.lock_globals();
7772dde4010b mod_posix: Catch SIGINT
Matthew Wild <mwild1@gmail.com>
parents: 2074
diff changeset
169 end);
991
cd0d75de8345 mod_posix: Allow logging and pidfile options to take effect without needing to daemonize. Add the ability to catch SIGTERM.
Matthew Wild <mwild1@gmail.com>
parents: 735
diff changeset
170 end