syscalls: Move code around [NFC].
* guix/build/syscalls.scm: Move packed structure handling to the top.
This commit is contained in:
Ludovic Courtès
parent
f489ce3c93
commit
73f38d5ff3
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@ -101,6 +101,112 @@
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;;;
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;;; Code:
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;;;
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;;; Packed structures.
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;;;
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(define-syntax sizeof*
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;; XXX: This duplicates 'compile-time-value'.
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(syntax-rules (int128)
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((_ int128)
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16)
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((_ type)
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(let-syntax ((v (lambda (s)
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(let ((val (sizeof type)))
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(syntax-case s ()
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(_ val))))))
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v))))
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(define-syntax alignof*
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;; XXX: This duplicates 'compile-time-value'.
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(syntax-rules (int128)
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((_ int128)
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16)
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((_ type)
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(let-syntax ((v (lambda (s)
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(let ((val (alignof type)))
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(syntax-case s ()
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(_ val))))))
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v))))
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(define-syntax align ;as found in (system foreign)
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(syntax-rules (~)
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"Add to OFFSET whatever it takes to get proper alignment for TYPE."
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((_ offset (type ~ endianness))
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(align offset type))
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((_ offset type)
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(1+ (logior (1- offset) (1- (alignof* type)))))))
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(define-syntax type-size
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(syntax-rules (~)
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((_ (type ~ order))
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(sizeof* type))
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((_ type)
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(sizeof* type))))
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(define-syntax write-type
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(syntax-rules (~)
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((_ bv offset (type ~ order) value)
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(bytevector-uint-set! bv offset value
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(endianness order) (sizeof* type)))
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((_ bv offset type value)
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(bytevector-uint-set! bv offset value
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(native-endianness) (sizeof* type)))))
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(define-syntax write-types
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(syntax-rules ()
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((_ bv offset () ())
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#t)
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((_ bv offset (type0 types ...) (field0 fields ...))
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(begin
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(write-type bv (align offset type0) type0 field0)
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(write-types bv
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(+ (align offset type0) (type-size type0))
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(types ...) (fields ...))))))
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(define-syntax read-type
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(syntax-rules (~ quote *)
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((_ bv offset '*)
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(make-pointer (bytevector-uint-ref bv offset
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(native-endianness)
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(sizeof* '*))))
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((_ bv offset (type ~ order))
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(bytevector-uint-ref bv offset
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(endianness order) (sizeof* type)))
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((_ bv offset type)
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(bytevector-uint-ref bv offset
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(native-endianness) (sizeof* type)))))
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(define-syntax read-types
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(syntax-rules ()
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((_ return bv offset () (values ...))
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(return values ...))
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((_ return bv offset (type0 types ...) (values ...))
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(read-types return
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bv
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(+ (align offset type0) (type-size type0))
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(types ...)
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(values ... (read-type bv
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(align offset type0)
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type0))))))
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(define-syntax define-c-struct
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(syntax-rules ()
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"Define READ as a deserializer and WRITE! as a serializer for the C
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structure with the given TYPES. READ uses WRAP-FIELDS to return its value."
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((_ name wrap-fields read write! (fields types) ...)
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(begin
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(define (write! bv offset fields ...)
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(write-types bv offset (types ...) (fields ...)))
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(define (read bv offset)
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(read-types wrap-fields bv offset (types ...) ()))))))
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;;;
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;;; FFI.
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;;;
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(define %libc-errno-pointer
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;; Glibc's 'errno' pointer.
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(let ((errno-loc (dynamic-func "__errno_location" (dynamic-link))))
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@ -159,6 +265,11 @@ the returned procedure is called."
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(error (format #f "~a: syscall->procedure failed: ~s"
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name args))))))
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;;;
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;;; File systems.
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;;;
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(define (augment-mtab source target type options)
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"Augment /etc/mtab with information about the given mount point."
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(let ((port (open-file "/etc/mtab" "a")))
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@ -322,6 +433,11 @@ string TMPL and return its file name. TMPL must end with 'XXXXXX'."
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(list err)))
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(pointer->string result)))))
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;;;
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;;; Containers.
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;;;
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;; Linux clone flags, from linux/sched.h
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(define CLONE_CHILD_CLEARTID #x00200000)
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(define CLONE_CHILD_SETTID #x01000000)
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@ -395,107 +511,6 @@ system to PUT-OLD."
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(list new-root put-old (strerror err))
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(list err)))))))
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;;;
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;;; Packed structures.
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;;;
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(define-syntax sizeof*
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;; XXX: This duplicates 'compile-time-value'.
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(syntax-rules (int128)
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((_ int128)
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16)
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((_ type)
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(let-syntax ((v (lambda (s)
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(let ((val (sizeof type)))
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(syntax-case s ()
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(_ val))))))
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v))))
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(define-syntax alignof*
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;; XXX: This duplicates 'compile-time-value'.
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(syntax-rules (int128)
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((_ int128)
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16)
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((_ type)
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(let-syntax ((v (lambda (s)
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(let ((val (alignof type)))
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(syntax-case s ()
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(_ val))))))
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v))))
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(define-syntax align ;as found in (system foreign)
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(syntax-rules (~)
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"Add to OFFSET whatever it takes to get proper alignment for TYPE."
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((_ offset (type ~ endianness))
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(align offset type))
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((_ offset type)
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(1+ (logior (1- offset) (1- (alignof* type)))))))
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(define-syntax type-size
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(syntax-rules (~)
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((_ (type ~ order))
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(sizeof* type))
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((_ type)
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(sizeof* type))))
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(define-syntax write-type
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(syntax-rules (~)
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((_ bv offset (type ~ order) value)
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(bytevector-uint-set! bv offset value
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(endianness order) (sizeof* type)))
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((_ bv offset type value)
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(bytevector-uint-set! bv offset value
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(native-endianness) (sizeof* type)))))
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(define-syntax write-types
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(syntax-rules ()
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((_ bv offset () ())
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#t)
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((_ bv offset (type0 types ...) (field0 fields ...))
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(begin
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(write-type bv (align offset type0) type0 field0)
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(write-types bv
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(+ (align offset type0) (type-size type0))
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(types ...) (fields ...))))))
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(define-syntax read-type
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(syntax-rules (~ quote *)
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((_ bv offset '*)
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(make-pointer (bytevector-uint-ref bv offset
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(native-endianness)
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(sizeof* '*))))
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((_ bv offset (type ~ order))
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(bytevector-uint-ref bv offset
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(endianness order) (sizeof* type)))
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((_ bv offset type)
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(bytevector-uint-ref bv offset
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(native-endianness) (sizeof* type)))))
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(define-syntax read-types
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(syntax-rules ()
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((_ return bv offset () (values ...))
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(return values ...))
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((_ return bv offset (type0 types ...) (values ...))
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(read-types return
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bv
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(+ (align offset type0) (type-size type0))
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(types ...)
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(values ... (read-type bv
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(align offset type0)
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type0))))))
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(define-syntax define-c-struct
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(syntax-rules ()
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"Define READ as a deserializer and WRITE! as a serializer for the C
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structure with the given TYPES. READ uses WRAP-FIELDS to return its value."
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((_ name wrap-fields read write! (fields types) ...)
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(begin
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(define (write! bv offset fields ...)
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(write-types bv offset (types ...) (fields ...)))
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(define (read bv offset)
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(read-types wrap-fields bv offset (types ...) ()))))))
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;;;
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;;; Network interfaces.
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