First, thank you for your great work on this library.

I just use it for the first time. I write the following code to test unix fork:

===============================================

(asdf:oos 'asdf:load-op :cffi)

(defpackage :testfork

(:use :common-lisp :cffi))

(in-package :testfork)

(defcvar "errno" :int)

(cffi:defcfun ("getpid" unix-getpid) :int)

(cffi:defcfun ("getuid" unix-getuid) :int)

(cffi:defcfun ("getgid" unix-getgid) :int)

(cffi:defcfun ("fork" unix-fork) :int)

(cffi:defcfun ("exit" unix-exit) :void (code :int))

(cffi:defcfun ("wait" unix-wait) :int (statloc :pointer))

(when (zerop (unix-fork))

(with-foreign-pointer-as-string (str 6 str-size :encoding :ascii)

(lisp-string-to-foreign "Hello, foreign world!" str str-size))

(unix-exit 0))

(progn

(format t "I'm parent, Pid=~A~%" (unix-getpid))

(format t "one child claimed!~A~%" (unix-wait (cffi:null-pointer)))

)

===============================================

When I add two lines using with-foreign-pointer-as-string and lisp-string-to-foreign, my SBCL always crashes, and tell me

" fatal error encountered in SBCL pid XXXX:

Unhandled memory fault. "

I have tried other memory allocation macros, I get the same result. But if I remove them, the program runs and exits normally.

What's the problem about allocating memory in child process? Or I use them in the wrong way?

My environment is : OSX 10.8.3 Processor Intel Core i7, SBCL 1.0.55.0-abb03f9, cffi_0.10.7.1 installed from quicklisp

Thank you very much!