package lwt_log

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in-package search v0.2.0

lwt_log
- Lwt_daemon
- Lwt_log
lwt_log.core
- Lwt_log_core
  - Section
- Lwt_log_rules

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Daemon helpers

val daemonize : 
  ?syslog:bool ->
  ?stdin:[ `Dev_null | `Close | `Keep ] ->
  ?stdout:
    [ `Dev_null | `Close | `Keep | `Log_default | `Log of Lwt_log.logger ] ->
  ?stderr:
    [ `Dev_null | `Close | `Keep | `Log_default | `Log of Lwt_log.logger ] ->
  ?directory:string ->
  ?umask:[ `Keep | `Set of int ] ->
  unit ->
  unit

Put the current running process into daemon mode. I.e. it forks and exit the parent, detach it from its controlling terminal, and redict standard intputs/outputs..

Notes:

you must be sure that there is no pending threads when calling this function, otherwise they may be canceled.

If syslog is true (the default), then Lwt_log.default is set to Lwt_log.syslog ~facility:`Daemon (), otherwise it is kept unchanged.

stdin is one of:

`Dev_null which means that Unix.stdin is reopened as /dev/null, this is the default behavior
`Close means that Unix.stdin is simply closed
`Keep means that Unix.stdin is left unchanged

stdout and stderr control how the two associated file descriptors are redirected:

`Dev_null means that the output is redirected to /dev/null
`Close means that the file descriptor is closed
`Keep means that it is left unchanged
`Log logger means that the output is redirected to this logger
`Log_default means that the output is redirected to the default logger

Both stdout and stderr default to `Log_default.

Warning: do not redirect an output to a logger logging into this output. For example, this code will create an infinite loop:

let logger = Lwt_log.channel ~close_mode:`Keep ~channel:Lwt_io.stderr () in
Lwt_daemon.daemonize ~syslog:false ~stderr:(`Log logger) ();
prerr_endline "foo"

The current working directory is set to directory, which defaults to "/".

umask may be one of:

`Keep which means that the umask is left unchanged
`Set n which means that the umask is set to n

It defaults to `Set 0o022.