[Haskell-cafe] Re: Bug in runInteractiveProcess?

Brandon S. Allbery KF8NH allbery at ece.cmu.edu
Tue Oct 16 22:31:57 EDT 2007

On Oct 16, 2007, at 21:40 , Richard A. O'Keefe wrote:

> 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).

I could dig for official confirmation, but this is my understanding  
of both POSIX and SUS, and portable C programs generally #define  
FD_CLOEXEC to 1 if it doesn't already exist, since the value *is*  
standard even though the name is not.

brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university    KF8NH

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