On 9/5/07, Michael Kerrisk <[email protected]> wrote:
> O_CLOEXEC (Since Linux 2.6.23)
> Enable the close-on-exec flag for the new file
> descriptor. This is useful in multithreaded programs
> since using a separate fcntl(2) F_SETFD operation to
> set the FD_CLOEXEC flag does not suffice to avoid race
> conditions in multithreaded programs where one thread
> opens a file descriptor at the same time as another
> thread does a fork(2) plus execve(2).
Correct, although you might want to reconsider the repetition of "in
multithreaded programs".
Plus, it's also useful in other programs since it avoids the
additional system call to fcntl.
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