Re: [PATCH] immortal helpers

[Robert Collins]

On Mon, 2010-02-22 at 02:03 +0100, Henrik Nordström wrote:
> mån 2010-02-22 klockan 11:44 +1100 skrev Robert Collins:
> 
> > command protocol for it would be pretty similar to the SHM disk IO
> > helper, but for processes. Something like:
> > squid->helper: spawn stderrfd argv(escaped/encoded to be line & NULLZ
> >                string safe)
> > helper->squid: pid, stdinfd, stdoutfd
> 
> Which requires UNIX domain sockets for fd passing, and unknown
> implementation on Windows..

I thought SHM could pass around fd's. Anyhow, its doable on unix. On
windows you can supply a HANDLE cross process:
BOOL WINAPI DuplicateHandle(
  __in   HANDLE hSourceProcessHandle,
  __in   HANDLE hSourceHandle,
  __in   HANDLE hTargetProcessHandle,
  __out  LPHANDLE lpTargetHandle,
  __in   DWORD dwDesiredAccess,
  __in   BOOL bInheritHandle,
  __in   DWORD dwOptions
)

So you call that, and then the other process can use the handle.

-Rob

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