contrib/sb-posix/macros.lisp

   1 (in-package :sb-posix)
   2
   3 (define-designator filename c-string
   4   (pathname
   5    (sb-ext:native-namestring (translate-logical-pathname filename)))
   6   (string filename))
   7
   8 (define-designator file-descriptor (integer 32)
   9   (file-stream (sb-sys:fd-stream-fd file-descriptor))
  10   (fixnum file-descriptor))
  11
  12 (define-designator sap-or-nil sb-sys:system-area-pointer
  13   (null (sb-sys:int-sap 0))
  14   (sb-sys:system-area-pointer sap-or-nil))
  15
  16 (define-designator alien-pointer-to-anything-or-nil (* t)
  17   (null (sb-alien:sap-alien (sb-sys:int-sap 0) (* t)))
  18   ((alien (* t)) alien-pointer-to-anything-or-nil))
  19
  20 (defun lisp-for-c-symbol (s)
  21   (let ((root (if (eql #\_ (char s 0)) (subseq s 1) s)))
  22     (intern (substitute #\- #\_ (string-upcase root)) :sb-posix)))
  23
  24 (defmacro define-call-internally (lisp-name c-name return-type error-predicate
  25                                   &rest arguments)
  26   (if (sb-sys:find-foreign-symbol-address c-name)
  27       `(progn
  28         (declaim (inline ,lisp-name))
  29         (defun ,lisp-name ,(mapcar #'car arguments)
  30           (let ((r (alien-funcall
  31                     (extern-alien
  32                      ,c-name
  33                      (function ,return-type
  34                                ,@(mapcar
  35                                   (lambda (x)
  36                                     (gethash (cadr x)
  37                                              *designator-types*
  38                                              (cadr x)))
  39                                   arguments)))
  40                     ,@(mapcar (lambda (x)
  41                                 (if (nth-value 1
  42                                                (gethash (cadr x)
  43                                                         *designator-types*))
  44                                     `(,(intern (symbol-name (cadr x))
  45                                                :sb-posix)
  46                                       ,(car x))
  47                                     (car x)))
  48                               arguments))))
  49             (if (,error-predicate r) (syscall-error) r))))
  50       `(sb-int:style-warn "Didn't find definition for ~S" ,c-name)))
  51
  52 (defmacro define-call (name return-type error-predicate &rest arguments)
  53   (let ((lisp-name (lisp-for-c-symbol name)))
  54     `(progn
  55        (export ',lisp-name :sb-posix)
  56        (define-call-internally ,lisp-name
  57            ,name
  58          ,return-type
  59          ,error-predicate
  60          ,@arguments))))
  61
  62 (defmacro define-entry-point (name arglist &body body)
  63   (let ((lisp-name (lisp-for-c-symbol name)))
  64     `(progn
  65       (export ',lisp-name :sb-posix)
  66       (declaim (inline ,lisp-name))
  67       (defun ,lisp-name ,arglist
  68         ,@body))))