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Re: kern/44950: fcntl(F_MAXFD) returns bogus values
The following reply was made to PR kern/44950; it has been noted by GNATS.
From: christos%zoulas.com@localhost (Christos Zoulas)
To: David Laight <david%l8s.co.uk@localhost>, gnats-bugs%NetBSD.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
Subject: Re: kern/44950: fcntl(F_MAXFD) returns bogus values
Date: Sat, 14 May 2011 12:29:57 -0400
On May 14, 2:33pm, david%l8s.co.uk@localhost (David Laight) wrote:
-- Subject: Re: kern/44950: fcntl(F_MAXFD) returns bogus values
| On Wed, May 11, 2011 at 12:55:01PM +0000, Christos Zoulas wrote:
| > .... Note that
| > you cannot depend on what file descriptors the shell may have open. Just
| > give an example, if you do an NIS operation you end up with a file
| > open.
| I fairly sure that the shell command line redirects have to refer to
| file 0 through 9 in an exec'd child process - so those can't be used
| for other purposes.
| I did think that that the shell shouldn't really leave anything else open.
It depends on the shell. Bourne-like shells generally leave things alone,
where csh descendents make sure that everything above 2 is closed and
internally they use 16, 17, 18 for stdin, stdout, stderr so that they
don't have to play games with 0, 1, 2 each time they execute something.
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