is fork() supported?

[Andrew Haley]

On 8/4/21 9:00 PM, DJ Delorie via Libffi-discuss wrote:
> I don't mean fork/exec (duh) but a fork() and keep going...
> 
> Consider a case where a process is using a file-backed mapping for
> closures; a fork() doesn't isolate that backing between parent/child
> so there's a chance (for example) the parent could deallocate a
> closure that the child needs, etc...
> 
> I see four options...
> 
> 1. Not supported.  Sorry.
> 
> 2. Supported only if you have fork-able closure backings (mmap or
>    maybe ktmpfile, but not file-backed) but this means documenting
>    that (at least) selinux settings might affect this.  Caveat
>    Programmer.
> 
> 3. Some API that says "I need this" so it can fail in a more useful
>    way than "segfault".
> 
> 4. Fully supported, and we have some work to do to handle fork events.

The bug that will never die.

https://bugzilla.redhat.com/show_bug.cgi?id=1249685
https://bugzilla.redhat.com/show_bug.cgi?id=531233
https://bugzilla.redhat.com/show_bug.cgi?id=772657

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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