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Date: Sun, 13 Nov 2005 16:06:23 -0500 (EST)
From: Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com
To: Christian Franke <Christian DOT Franke AT t-online DOT de>
cc: cygwin AT cygwin DOT com
Subject: Re: setsid() does not call FreeConsole() even if all files are closed
In-Reply-To: <4377651F.9050400@t-online.de>
Message-ID: <Pine.GSO.4.63.0511131602070.21239@slinky.cs.nyu.edu>
References: <4377651F DOT 9050400 AT t-online DOT de>
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Content-ID: <Pine DOT GSO DOT 4 DOT 63 DOT 0511131602072 DOT 21239 AT slinky DOT cs DOT nyu DOT edu>

On Sun, 13 Nov 2005, Christian Franke wrote:

> when starting a daemon from the console, the console will not close
> before the daemon finishes.
>
> Try, e.g:
>
> $ /usr/sbin/syslogd
> $ exit
>
> Shell exits, but console window persists until syslogd is terminated.
>
> Workaround:
>
>   setsid();
> +  #ifdef __CYGWIN__
> +  FreeConsole();
> +  #endif
>
> According to syscall.cc:setsid(), FreeConsole() should be called if a
> tty exists and no files are open.

Yep, so, as CGF noted, try

$ /usr/sbin/syslogd >/dev/null 2>&1 </dev/null
$ exit

However, the main question is whether syslogd *should* close the file
descriptors if it doesn't intend to write to them.  I'm not familiar
enough with syslogd's operation -- if it normally writes to stdout/stderr
(or reads from stdin), the above is the only way to get the shell to
close.  If syslogd never reads/writes to standard filehandles in daemon
mode, it should close them itself (i.e., this is a syslogd bug).
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
      |\      _,,,---,,_		pechtcha AT cs DOT nyu DOT edu
ZZZzz /,`.-'`'    -.  ;-;;,_		igor AT watson DOT ibm DOT com
     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski, Ph.D.
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

If there's any real truth it's that the entire multidimensional infinity
of the Universe is almost certainly being run by a bunch of maniacs. /DA

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