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-rw-r--r--plugins/mod_posix.lua37
1 files changed, 25 insertions, 12 deletions
diff --git a/plugins/mod_posix.lua b/plugins/mod_posix.lua
index b75b9610..ed0dbd87 100644
--- a/plugins/mod_posix.lua
+++ b/plugins/mod_posix.lua
@@ -19,6 +19,9 @@ end
local logger_set = require "util.logger".setwriter;
+local lfs = require "lfs";
+local stat = lfs.attributes;
+
local prosody = _G.prosody;
module.host = "*"; -- we're a global module
@@ -59,28 +62,38 @@ module:add_event_hook("server-starting", function ()
end
end);
-local pidfile_written;
+local pidfile;
+local pidfile_handle;
local function remove_pidfile()
- if pidfile_written then
- os.remove(pidfile_written);
- pidfile_written = nil;
+ if pidfile_handle then
+ pidfile_handle:close();
+ os.remove(pidfile);
+ pidfile, pidfile_handle = nil, nil;
end
end
local function write_pidfile()
- if pidfile_written then
+ if pidfile_handle then
remove_pidfile();
end
- local pidfile = module:get_option("pidfile");
+ pidfile = module:get_option("pidfile");
if pidfile then
- local pf, err = io.open(pidfile, "w+");
- if not pf then
- module:log("error", "Couldn't write pidfile; %s", err);
+ local mode = stat(pidfile) and "r+" or "w+";
+ pidfile_handle, err = io.open(pidfile, mode);
+ if not pidfile_handle then
+ module:log("error", "Couldn't write pidfile at %s; %s", pidfile, err);
+ prosody.shutdown("Couldn't write pidfile");
else
- pf:write(tostring(pposix.getpid()));
- pf:close();
- pidfile_written = pidfile;
+ if not lfs.lock(pidfile_handle, "w") then -- Exclusive lock
+ local other_pid = pidfile_handle:read("*a");
+ module:log("error", "Another Prosody instance seems to be running with PID %s, quitting", other_pid);
+ pidfile_handle = nil;
+ prosody.shutdown("Prosody already running");
+ else
+ pidfile_handle:write(tostring(pposix.getpid()));
+ pidfile_handle:flush();
+ end
end
end
end