dup3/O_CLOEXEC/F_DUPFD_CLOEXEC

Corinna Vinschen corinna-cygwin@cygwin.com
Thu Jan 14 11:57:00 GMT 2010


On Jan 14 12:47, Corinna Vinschen wrote:
> On Jan 13 21:00, Eric Blake wrote:
> >   And while it looks
> > like mq_open should not care about O_CLOEXEC, there may be some cleanup
> > needed there.
> 
> It just occured to me that this an important hint.  Message queue
> descriptors are always closed-on-exec.  Apparently I forgot to set the
> close-on-exec flag on the underlying file descriptor.  That's a good
> time to do that via the O_CLOEXEC flag.

Hang on, the file is closed anyway after the mmap call succeeded.
That's not true for sem_open and shm_open, though.

However, what kind of cleanup did you mean?  There's no EINVAL specified
in POSIX for invalid open flags and invalid flags are already filtered
out before calling open.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat



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