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 (name)
  21   (etypecase name
  22     (list
  23      (lisp-for-c-symbol (car name)))
  24     (string
  25      (let ((root (if (eql #\_ (char name 0)) (subseq name 1) name)))
  26        (intern (substitute #\- #\_ (string-upcase root)) :sb-posix)))))
  27
  28 ;; Note: this variable is set in interface.lisp.  defined here for
  29 ;; clarity and so the real-c-name compile as desired.
  30 (defparameter *c-functions-in-runtime* nil)
  31
  32 (defun real-c-name (name)
  33   (let  ((maybe-name
  34           (etypecase name
  35             (list
  36              (destructuring-bind (name &key c-name options) name
  37                (if c-name
  38                    c-name
  39                    (cond #+largefile
  40                          ((or (eql options :largefile)
  41                               (member :largefile options))
  42                           (format nil "~a_largefile" name))
  43                          (t
  44                           name)))))
  45             (string
  46              name))))
  47     (if (member maybe-name *c-functions-in-runtime*
  48                 :test #'string=)
  49         (format nil "_~A" maybe-name)
  50         maybe-name)))
  51
  52 (defmacro define-call-internally (lisp-name c-name return-type error-predicate
  53                                   &rest arguments)
  54   (if (sb-sys:find-foreign-symbol-address c-name)
  55       `(progn
  56         (declaim (inline ,lisp-name))
  57         (defun ,lisp-name ,(mapcar #'car arguments)
  58           (let ((r (alien-funcall
  59                     (extern-alien
  60                      ,c-name
  61                      (function ,return-type
  62                                ,@(mapcar
  63                                   (lambda (x)
  64                                     (gethash (cadr x)
  65                                              *designator-types*
  66                                              (cadr x)))
  67                                   arguments)))
  68                     ,@(mapcar (lambda (x)
  69                                 (if (nth-value 1
  70                                                (gethash (cadr x)
  71                                                         *designator-types*))
  72                                     `(,(intern (symbol-name (cadr x))
  73                                                :sb-posix)
  74                                       ,(car x))
  75                                     (car x)))
  76                               arguments))))
  77             (if (,error-predicate r) (syscall-error) r))))
  78       `(sb-int:style-warn "Didn't find definition for ~S" ,c-name)))
  79
  80 (defmacro define-call (name return-type error-predicate &rest arguments)
  81   (let ((lisp-name (lisp-for-c-symbol name))
  82         (real-c-name (real-c-name name)))
  83     `(progn
  84        (export ',lisp-name :sb-posix)
  85        (define-call-internally ,lisp-name
  86            ,real-c-name
  87          ,return-type
  88          ,error-predicate
  89          ,@arguments))))
  90
  91 (defmacro define-entry-point (name arglist &body body)
  92   (let ((lisp-name (lisp-for-c-symbol name)))
  93     `(progn
  94       (export ',lisp-name :sb-posix)
  95       (declaim (inline ,lisp-name))
  96       (defun ,lisp-name ,arglist
  97         ,@body))))