[Haskell-cafe] Re: Bug in runInteractiveProcess?

Richard A. O'Keefe ok at cs.otago.ac.nz
Tue Oct 16 21:40:40 EDT 2007

On 17 Oct 2007, at 10:58 am, John Goerzen wrote:
> Do you mean FD_CLOEXEC, which can be set with fcntl()?  If so, it's  
> not
> defined in POSIX according to the Linux manpage.  I couldn't find
> CLOSE_ON_EXEC in either open(2) or fcntl(2).

F_GETFD and F_SETFD are the things to look for; FD_CLOEXEC is a fancy
way of saying 1 in historic UNIXes.  The OSF/1 /usr/include/sys/
fcntl.h says that FD_CLOEXEC is "POSIX REQUIRED".  This facility is
most certainly part of the Single Unix Specification.  The MacOS 10.4
manual page for fcntl() doesn't mention FD_CLOEXEC, but it *does*
mention F_GETFD and F_SETFD and identifies the close-on-execute flag
as being the "low-order bit" of that flags word, so what may possibly
be missing from some editions of POSIX is the *name* FD_CLOEXEC but
not the facility (F_SETFD) or the value (1).

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