Re: thread rant

From: Jamie Lokier (
Date: Sat Sep 02 2000 - 08:38:14 EST

dean gaudet wrote:
> an example of brokenness in the traditional fd API is close-on-exec --
> there's a race between open()/socket()/pipe() and fcntl(FD_CLOEXEC) during
> which if another thread does a fork() it's possible the child will inherit
> an fd it shouldn't... working around it is painful. the model which
> NT/OS2 use for creating a new process scales better in the 99.99% case of
> stdin/out/err -- you only specify those fds you want to keep in the new
> process.

An obvious solution presents itself. O_CLOEXEC.

Glibc could easily be made to call fcntl(FD_CLOEXEC) for kernels that
don't implement O_CLOEXEC, so that applications can simply use the flag
and rely on it.

-- Jamie
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