exit_status: PSEUDO_EXIT; char * message = "exit status unknown"
# 0 indicates success. The others indicate where in the startup process
# something went wrong, for any point at which we'd exit.
general, "unspecified error"
fork_failed, "fork failed"
lock_path, "path allocation failure for lock file"
lock_held, "lock already held by another process"
lock_failed, "could not create/lock lockfile"
timeout, "child process timed out"
waitpid, "waitpid() for child process failed unexpectedly"
socket_create, "couldn't create socket"
socket_fd, "couldn't move socket to safe file descriptor"
socket_path, "path allocation failure for server socket"
socket_unlink, "couldn't unlink existing server socket"
socket_bind, "couldn't bind server socket"
socket_listen, "couldn't listen on server socket"
listen_fd, "server loop had no valid listen fd"
pseudo_loaded, "server couldn't get out of pseudo environment"
pseudo_prefix, "couldn't get valid pseudo prefix"
pseudo_invocation, "invalid server command arguments"