[cffi-devel] [Sbcl-devel] GC write-protected mappings vs. the OS kernel

[Juho Snellman]

Samium Gromoff <_deepfire at feelingofgreen.ru> writes:

> Good day,
> 
> While debugging mysterious ioctl() failures in lh-usb on SBCL,
> I have discovered that using CFFI:WITH-POINTER-TO-VECTOR-DATA
> doesn't guarantee that the vector is in a writable region.

I thought we'd never write protect specialized raw arrays (either they
are in the nursery, or they're tenured into an unboxed region which
never get wpd). And passing generic arrays to ffi doesn't feel right.
What's the use case?

-- 
Juho Snellman