[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: exec 0</dev/null vs. nohup?

From: Ralf Wildenhues
Subject: Re: exec 0</dev/null vs. nohup?
Date: Mon, 31 May 2010 21:24:28 +0200
User-agent: Mutt/1.5.20 (2009-10-28)

Hello Jay,

* Jay K wrote on Wed, May 26, 2010 at 03:17:39PM CEST:
> I don't have the full background any longer, but I made
> this change to a configure script:
> before:
> exec 7<&0 </dev/null 6>&1
> after:
> exec 6>&1
> my comment at the time (2008-06-03) was:
> take minor change to older boilerplate from other nearby
>  configure files, in order to let it work under "nohup", on OpenBSD
>  otherwise there is an error about an invalid file handle
>  Make sense?

Not really, to me at least.

> Clearly you are doing this on purpose though.

Yes, we are.  If you need the original standard input during the
configure script, you can get at it with the AS_ORIGINAL_STDIN_FD
macro; see `info Autoconf "File Descriptor Macros"'.

> Maybe it just prints an error but there's no error?
> I just did a quick experiment with just
> exec 0</dev/null
> and nohup but couldn't get an error.
> I've surely upgraded OpenBSD in the meantime.

Well, if you cannot reproduce an error any more, I'll go and claim
we shouldn't need to worry until you hit it again.  ;-)


reply via email to

[Prev in Thread] Current Thread [Next in Thread]