X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=contrib%2Fsb-posix%2Fmacros.lisp;h=aa69c474f0c1e31bc9a43fcfa781c135a2c0ab29;hb=25c1769e30ff7404b52a9be663626d87f8ff75bc;hp=c69182694aa8246a7d932df11402409a9ffbeeda;hpb=607f3e366b0e5b5fb4606202a6a5f625c05c3838;p=sbcl.git

diff --git a/contrib/sb-posix/macros.lisp b/contrib/sb-posix/macros.lisp
index c691826..aa69c47 100644
--- a/contrib/sb-posix/macros.lisp
+++ b/contrib/sb-posix/macros.lisp
@@ -1,24 +1,98 @@
 (in-package :sb-posix)
 
-(define-designator filename c-string
+(define-designator filename (string c-string)
+  ("A STRING designating a filename in native namestring syntax.
+
+Note that native namestring syntax is distinct from Lisp namestring syntax:
+
+  \(pathname \"/foo*/bar\")
+
+is a wild pathname with a pattern-matching directory component.
+SB-EXT:PARSE-NATIVE-NAMESTRING may be used to construct Lisp pathnames that
+denote POSIX filenames as understood by system calls, and
+SB-EXT:NATIVE-NAMESTRING can be used to coerce them into strings in the native
+namestring syntax.
+
+Note also that POSIX filename syntax does not distinguish the names of files
+from the names of directories: in order to parse the name of a directory in
+POSIX filename syntax into a pathname MY-DEFAULTS for which
+
+  \(merge-pathnames (make-pathname :name \"FOO\" :case :common)
+                    my-defaults)
+
+returns a pathname that denotes a file in the directory, supply a true
+:AS-DIRECTORY argument to SB-EXT:PARSE-NATIVE-NAMESTRING. Likewise, to supply
+the name of a directory to a POSIX function in non-directory syntax, supply a
+true :AS-FILE argument to SB-EXT:NATIVE-NAMESTRING."
+   "Designator for a FILENAME: a STRING designating itself, or a
+designator for a PATHNAME designating the corresponding native namestring."
+   "Converts FILENAME-DESIGNATOR into a FILENAME.")
   (pathname
-   (sb-ext:native-namestring (translate-logical-pathname filename)))
-  (string filename))
+   (sb-ext:native-namestring (translate-logical-pathname filename)
+                             :as-file t))
+  (string
+   filename)
+  (stream
+   (filename (pathname filename))))
+
+(define-designator file-descriptor (fixnum (integer 32))
+    ("A FIXNUM designating a native file descriptor.
 
-(define-designator file-descriptor (integer 32)
-  (file-stream (sb-sys:fd-stream-fd file-descriptor))
-  (fixnum file-descriptor))
+SB-SYS:MAKE-FD-STREAM can be used to construct a FILE-STREAM associated with a
+native file descriptor.
 
-(define-designator sap-or-nil sb-sys:system-area-pointer
+Note that mixing I/O operations on a FILE-STREAM with operations directly on its
+descriptor may produce unexpected results if the stream is buffered."
+     "Designator for a FILE-DESCRIPTOR: either a fixnum designating itself, or
+a FILE-STREAM designating the underlying file-descriptor."
+     "Converts FILE-DESCRIPTOR-DESIGNATOR into a FILE-DESCRIPTOR.")
+  (file-stream
+   (sb-sys:fd-stream-fd file-descriptor))
+  (fixnum
+   file-descriptor))
+
+(define-designator sap-or-nil (sb-sys:system-area-pointer sb-sys:system-area-pointer)
+    ()
   (null (sb-sys:int-sap 0))
   (sb-sys:system-area-pointer sap-or-nil))
 
-(define-designator alien-pointer-to-anything-or-nil (* t)
+(define-designator alien-pointer-to-anything-or-nil (sb-alien-internals::alien-value (* t))
+    ()
   (null (sb-alien:sap-alien (sb-sys:int-sap 0) (* t)))
   ((alien (* t)) alien-pointer-to-anything-or-nil))
 
-(defun lisp-for-c-symbol (s)
-  (intern (substitute #\- #\_ (string-upcase s)) :sb-posix))
+(defun lisp-for-c-symbol (name)
+  (etypecase name
+    (list
+     (lisp-for-c-symbol (car name)))
+    (string
+     (let ((root (if (eql #\_ (char name 0)) (subseq name 1) name)))
+       (intern (substitute #\- #\_ (string-upcase root)) :sb-posix)))))
+
+;; Note: this variable is set in interface.lisp.  defined here for
+;; clarity and so the real-c-name compile as desired.
+(defparameter *c-functions-in-runtime* nil)
+
+(defun real-c-name (name)
+  (let  ((maybe-name
+          (etypecase name
+            (list
+             (destructuring-bind (name &key c-name options) name
+               (declare (ignorable options))
+               (if c-name
+                   c-name
+                   (cond #+largefile
+                         ((or (eql options :largefile)
+                              (member :largefile options))
+                          (format nil "~a_largefile" name))
+                         (t
+                          name)))))
+            (string
+             name))))
+    (if (member maybe-name *c-functions-in-runtime*
+                :test #'string=)
+        (format nil "_~A" maybe-name)
+        maybe-name)))
 
 (defmacro define-call-internally (lisp-name c-name return-type error-predicate
                                   &rest arguments)
@@ -45,15 +119,16 @@
                                       ,(car x))
                                     (car x)))
                               arguments))))
-            (if (,error-predicate r) (syscall-error) r))))
+            (if (,error-predicate r) (syscall-error ',lisp-name) r))))
       `(sb-int:style-warn "Didn't find definition for ~S" ,c-name)))
 
 (defmacro define-call (name return-type error-predicate &rest arguments)
-  (let ((lisp-name (lisp-for-c-symbol name)))
+  (let ((lisp-name (lisp-for-c-symbol name))
+        (real-c-name (real-c-name name)))
     `(progn
        (export ',lisp-name :sb-posix)
        (define-call-internally ,lisp-name
-           ,name
+           ,real-c-name
          ,return-type
          ,error-predicate
          ,@arguments))))
@@ -65,3 +140,13 @@
       (declaim (inline ,lisp-name))
       (defun ,lisp-name ,arglist
         ,@body))))
+
+(defmacro define-simple-call (name return-type &rest arguments)
+  (multiple-value-bind (lisp-name c-name)
+      (values name (substitute #\_ #\- (string-downcase name)))
+    `(progn
+       (export ',lisp-name :sb-posix)
+       (defun ,lisp-name ,(mapcar #'first arguments)
+         (alien-funcall (extern-alien ,c-name (function ,return-type
+                                                        ,@(mapcar #'second arguments)))
+                        ,@(mapcar #'first arguments))))))
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