90 lines
2.6 KiB
OCaml
90 lines
2.6 KiB
OCaml
(* Lightweight thread library for Objective Caml
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* http://www.ocsigen.org/lwt
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* Module Lwt_io
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* Copyright (C) 2009 Jérémie Dimino
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, with linking exceptions;
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* either version 2.1 of the License, or (at your option) any later
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* version. See COPYING file for details.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*)
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open Lwt
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let rec copy ic logger =
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lwt line = Lwt_io.read_line ic in
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lwt () = Lwt_log.log ?logger ~level:Lwt_log.Notice line in
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copy ic logger
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let redirect fd logger =
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let fd_r, fd_w = Unix.pipe () in
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Unix.set_close_on_exec fd_r;
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Unix.dup2 fd_w fd;
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Unix.close fd_w;
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let ic = Lwt_io.of_unix_fd ~mode:Lwt_io.input fd in
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ignore (copy ic logger)
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let redirect_output dev_null fd mode = match mode with
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| `Dev_null ->
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Unix.dup2 dev_null fd
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| `Close ->
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Unix.close fd
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| `Keep ->
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()
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| `Log_default ->
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redirect fd None
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| `Log logger ->
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redirect fd (Some logger)
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let daemonize ?(syslog=true) ?(stdin=`Dev_null) ?(stdout=`Log_default) ?(stderr=`Log_default) ?(directory="/") ?(umask=`Set 0o022) () =
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if Unix.getppid () = 1 then
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(* If our parent is [init], then we already are a demon *)
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()
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else begin
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Unix.chdir directory;
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(* Exit the parent, and continue in the child: *)
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if Lwt_unix.fork () > 0 then begin
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(* Do not run exit hooks in the parent. *)
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Lwt_sequence.iter_node_l Lwt_sequence.remove Lwt_main.exit_hooks;
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exit 0
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end;
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if syslog then Lwt_log.default := Lwt_log.syslog ~facility:`Daemon ();
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(* Redirection of standard IOs *)
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let dev_null = Unix.openfile "/dev/null" [Unix.O_RDWR] 0o666 in
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begin match stdin with
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| `Dev_null ->
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Unix.dup2 dev_null Unix.stdin
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| `Close ->
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Unix.close Unix.stdin
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| `Keep ->
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()
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end;
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redirect_output dev_null Unix.stdout stdout;
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redirect_output dev_null Unix.stderr stderr;
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Unix.close dev_null;
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begin match umask with
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| `Keep ->
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()
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| `Set n ->
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ignore (Unix.umask 0o022);
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end;
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ignore (Unix.setsid ())
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end
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