Re: epoll and fork()

[Mihai RUSU]

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On Tue, 2 Mar 2004, Ben wrote:

> Is there a defined behaviour for what happens when a process with an epoll
> fd forks?
> 
> I've an app that inherits an epoll fd from its parent, and then
> unregisters some file descriptors from the epoll set. This seems to have
> the nasty side effect of unregistering the same file descriptors from the
> parent process as well. Surely this can't be right?
> 
> This is on 2.6.2.

Currect me if Im wrong but...

After a fork() arent all the parent's fds shared with the children ? This 
means that both processes can access the same fds right ? So the epoll fd 
(beeing just another fd as any other) is too shared between parent and 
child ? Which would mean both parent and child will "control" the same 
epoll kernel struct when doing epoll_ctl on it ?

> Ben

- -- 
Mihai RUSU                                    Email: dizzy@xxxxxxxxx
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                       "Linux is obsolete" -- AST
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