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syscalls: Use 'define-c-struct' for 'struct ifconf'.

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* guix/build/syscalls.scm (ifconf-struct): Remove.
(%ifconf-struct): New C struct.
(network-interface-names): Use 'make-bytevector' and 'write-ifconf!'
instead of 'make-c-struct', and 'read-ifconf' instead of
'parse-c-struct'.
This commit is contained in:
Ludovic Courtès 2016-11-16 23:13:12 +01:00
parent f43714e620
commit 9d9d0c9c98
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1 changed files with 14 additions and 8 deletions
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22
guix/build/syscalls.scm
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@ -773,10 +773,13 @@ exception if it's already taken."
(define IF_NAMESIZE 16) ;maximum interface name size
(define ifconf-struct
;; 'struct ifconf', from <net/if.h>.
(list int ;int ifc_len
'*)) ;struct ifreq *ifc_ifcu
(define-c-struct %ifconf-struct
sizeof-ifconf
list
read-ifconf
write-ifconf!
(length int) ;int ifc_len
(request '*)) ;struct ifreq *ifc_ifcu
(define ifreq-struct-size
;; 'struct ifreq' begins with an array of IF_NAMESIZE bytes containing the
@ -868,15 +871,18 @@ to interfaces that are currently up."
(sock (or sock (socket SOCK_STREAM AF_INET 0)))
(len (* ifreq-struct-size 10))
(reqs (make-bytevector len))
(conf (make-c-struct ifconf-struct
(list len (bytevector->pointer reqs)))))
(conf (make-bytevector sizeof-ifconf)))
(write-ifconf! conf 0
len (bytevector->pointer reqs))
(let-values (((ret err)
(%ioctl (fileno sock) SIOCGIFCONF conf)))
(%ioctl (fileno sock) SIOCGIFCONF
(bytevector->pointer conf))))
(when close?
(close-port sock))
(if (zero? ret)
(bytevector->string-list reqs ifreq-struct-size
(match (parse-c-struct conf ifconf-struct)
(match (read-ifconf conf)
((len . _) len)))
(throw 'system-error "network-interface-list"
"network-interface-list: ~A"