Re: [Valgrind-users] Return ENOSYS for unsupported system calls?

[Dan K. <da...@ke...>]

Crispin Flowerday wrote:
> At the moment when valgrind hits a system call that it doesn't
> understand it prints out a message and quits. I was wondering if it make
> sense to change this so that it prints out a message and continues
> returning ENOSYS.
> 
> This would be useful as I have a program that can make use of epoll() if
> it exists. When it starts up, it calls one of the epoll() functions and
> if that returns ENOSYS it continues on and reverts to poll(). Obviously
> at the moment valgrind just aborts when it encounters the epoll() system
> call.

Y'know, that's probably a good idea.  My wrapper around epoll()
will fall back to an older technique, too.
(See http://kegel.com/rn/current/rn.c)
It'd be nice if epoll_create() returned -1 on failure.

- Dan