Re: [cffi-devel] getifaddrs loop

Seems that the duplicated are expected, and the crash seems related to how i access the name slot

If i change the code to remove the mem-ref form it works fine, but i don't know what is the different.

(cffi:with-foreign-object (p :pointer)

(ice-cffi:getifaddrs p)

(do ()

((cffi:null-pointer-p p))

(format t "Interface: ~a~%" (cffi:foreign-slot-value p 'ifaddrs 'name))

(setf p (cffi:foreign-slot-value p 'ifaddrs 'next))))

On Mon, Dec 13, 2010 at 10:39 PM, pepone.onrez pepone.onrez@gmail.comwrote:

Hi,

I don't understand why my loop crashes,

Here is my grovel definition for ifaddrs struct:

(cstruct ifaddrs "struct ifaddrs" (next "ifa_next" :type :pointer) (name "ifa_name" :type :string) (flags "ifa_flags" :type :unsigned-int) (address "ifa_addr" :type :pointer) (netmask "ifa_netmask" :type :pointer) (broadcast "ifa_broadaddr" :type :pointer) (point-to-point-destination "ifa_dstaddr" :type :pointer) (data "ifa_data" :type :pointer))

Here is my loop, i was expecting next to be a null pointer after the first vmnet8

CL-USER> (cffi:with-foreign-object (p :pointer)

       (getifaddrs

p)

       (do

()

           ((cffi:null-pointer-p

p))

         (format t "Interface: ~a~%" (cffi:foreign-slot-value

(cffi:mem-ref p :pointer) 'ifaddrs 'name)) (setf p (cffi:foreign-slot-value p 'ifaddrs 'next)))) Interface: lo

Interface: sit0

Interface: eth0

Interface: wlan0

Interface: vmnet1

Interface: vmnet8

Interface: lo

Interface: wlan0

Interface: vmnet1

Interface: vmnet8

Interface: lo

Interface: wlan0

Interface: vmnet1

Interface: vmnet8

; Evaluation aborted on #<SB-SYS:MEMORY-FAULT-ERROR {BF604E1}>.

Regards, Jose