Add the Unix module and enable daemonization.

[dead/halcyon.git] / src / ExitCodes.hs

diff --git a/src/ExitCodes.hs b/src/ExitCodes.hs
index b190489bf3f1c6bb808f0b3abdf9b7b24a565b95..65a519869cf3f88ecfa86c64c0353b4d0c9c4553 100644 (file)
--- a/src/ExitCodes.hs
+++ b/src/ExitCodes.hs
@@ -1,8 +1,20 @@
--- |All exit codes that the program can return (excepting ExitSuccess).
--- There's only one, since the program will try/fail forever upon errors.
-module ExitCodes
+-- | All exit codes that the program can return (excepting
+--   ExitSuccess).
+module ExitCodes (
+  exit_no_usernames,
+  exit_pidfile_exists )
 where
 
--- |Indicates that the command-line arguments could not be parsed.
-exit_args_parse_failed :: Int
-exit_args_parse_failed = 1
+
+-- | No usernames found on either the command-line or in a config
+--   file.
+exit_no_usernames :: Int
+exit_no_usernames = 1
+
+
+-- | When running as a daemon, the existence of a fixed PID file is
+--   used to determine whether or not the daemon is already
+--   running. If the PID file already exists, we shouldn't start.
+--
+exit_pidfile_exists :: Int
+exit_pidfile_exists = 2