> Now, i still can't say how big the buffer ist, but i think it is not > bigger than 8K, thus a stack size of 10K should be enough. And for GNU-cp it asks for FIONREAD or something like this, gets 512 bytes and thus works perfectly with a small stack. At least that's what I once found the code to look like. It also explains why cp is so slooow... ciao, TeSche