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syscalls: Struct deserializer can now return arbitrary objects. 

* guix/build/syscalls.scm (read-types): Add RETURN and VALUES parameters.
  (define-c-struct): Add WRAP-FIELDS parameter and pass it to 'read-types'.
  (sockaddr-in, sockaddr-in6): Add first argument that uses
  'make-socket-address'.
  (read-socket-address): Remove 'match' on the result of 'read-sockaddr-in'
  and 'read-sockaddr-in6'.
master
Ludovic Courtès 2015-07-17 23:31:29 +02:00
parent 4f7b564adb
commit 13f0c6ed41
1 changed files with 16 additions and 16 deletions
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32
guix/build/syscalls.scm
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@ -398,22 +398,23 @@ system to PUT-OLD."
(define-syntax read-types
(syntax-rules ()
((_ bv offset ())
'())
((_ bv offset (type0 types ...))
(cons (read-type bv offset type0)
(read-types bv (+ offset (type-size type0)) (types ...))))))
((_ return bv offset () (values ...))
(return values ...))
((_ return bv offset (type0 types ...) (values ...))
(read-types return
bv (+ offset (type-size type0)) (types ...)
(values ... (read-type bv offset type0))))))
(define-syntax define-c-struct
(syntax-rules ()
"Define READ as an optimized serializer and WRITE! as a deserializer for
the C structure with the given TYPES."
((_ name read write! (fields types) ...)
"Define READ as a deserializer and WRITE! as a serializer for the C
structure with the given TYPES. READ uses WRAP-FIELDS to return its value."
((_ name wrap-fields read write! (fields types) ...)
(begin
(define (write! bv offset fields ...)
(write-types bv offset (types ...) (fields ...)))
(define (read bv offset)
(read-types bv offset (types ...)))))))
(read-types wrap-fields bv offset (types ...) ()))))))
;;;
@ -463,6 +464,8 @@ the C structure with the given TYPES."
32))
(define-c-struct sockaddr-in ;<linux/in.h>
(lambda (family port address)
(make-socket-address family address port))
read-sockaddr-in
write-sockaddr-in!
(family unsigned-short)
@ -470,6 +473,8 @@ the C structure with the given TYPES."
(address (int32 ~ big)))
(define-c-struct sockaddr-in6 ;<linux/in6.h>
(lambda (family port flowinfo address scopeid)
(make-socket-address family address port flowinfo scopeid))
read-sockaddr-in6
write-sockaddr-in6!
(family unsigned-short)
@ -501,14 +506,9 @@ bytevector BV at INDEX."
"Read a socket address from bytevector BV at INDEX."
(let ((family (bytevector-u16-native-ref bv index)))
(cond ((= family AF_INET)
(match (read-sockaddr-in bv index)
((family port address)
(make-socket-address family address port))))
(read-sockaddr-in bv index))
((= family AF_INET6)
(match (read-sockaddr-in6 bv index)
((family port flowinfo address scopeid)
(make-socket-address family address port
flowinfo scopeid))))
(read-sockaddr-in6 bv index))
(else
"unsupported socket address family" family))))