On Aug  2 16:50, Corinna Vinschen wrote:
> On Aug  2 13:55, Corinna Vinschen wrote:
> > [Moving this discussion to cygwin-developers]
> > On Jul 31 10:10, Corinna Vinschen wrote:
> > > On Jul 30 19:04, Ken Brown via Cygwin wrote:
> > > > On 7/30/2020 1:17 PM, Corinna Vinschen wrote:
> > > > > On Jul 30 13:59, Corinna Vinschen wrote:
> > > > > > On Jul 29 19:12, Ken Brown via Cygwin wrote:
> > > > > > > On 7/29/2020 4:17 PM, Ken Brown via Cygwin wrote:
> > > > > > > > posix_spawn(p) returns before the spawned process is fully up and
> > > > > > > > running.  [...]
> > > > > > > I just took a look at the source, and I see that posix_spawn
> > > > > > > was taken from FreeBSD.
> > > > > > > [...]
> > > > > > 
> > > > > > Actually, this is a Cygwin problem.
> > > > > > [...]
> > > > > > IOW, we need a Cygwin-specific do_posix_spawn() using fork(2)
> > > > > > in conjunction with some synchronization the BSD function
> > > > > > gets "for free" by using its specific vfork(2).
> > > > > 
> > > > > Below is a POC implementation for a Cygwin-specific do_posix_spawn().
> > > > > [...]
> > > > > Can you give it a try?
> > > > 
> > > > It looks like something further is needed: 'wait' doesn't seem to recognize
> > > > the spawned process.
> > > 
> > > Oh well.
> > > [...]
> > 
> > I attached another patch.  This one is designed from the ground up and
> > I *think* it works as desired.  I added lots of comments so the idea
> > behind this patch should be clear enough.
> > 
> > Please give it a try.
> 
> Version 2 [...]

Version 3.  The additional synchronization step can go away and the code
simplified quite a bit by providing a fork replacement returning the
child's process handle.  I hope this is the last version of the patch :}


Corinna