On Tue, Jun 25, 2002 at 03:21:58PM +0200, Carsten Langgaard wrote: > The problem is that the code is called with $a0 = 0. So the 'sw v0, > 0(a0)' after the syscall generates a segmentation fault. > Why are the pipe syscall implemented this way, where we return the two > descriptors in v0 and v1 ? > Why doesn't the kernel do these stores (this way we can do an access > check, like i386 does) ? Because the interface we're using here is even lighter, even faster. Note that by the time when I decieded to use this interface this was potencially a huge difference as verify_area() was searching the mm AVL trees, so this interface was potenciall much faster by that time. Ralf
