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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