Re: kern/44950: fcntl(F_MAXFD) returns bogus values

[christos%zoulas.com@localhost (Christos Zoulas)]

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, 
        netbsd-bugs%netbsd.org@localhost, martin%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 
to
 | >  give an example, if you do an NIS operation you end up with a file 
descriptor
 | >  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.
 
 christos