;;;; File Handles
+;;; Historically, SBCL on Windows used CRT (lowio) file descriptors,
+;;; unlike other Lisps. They really help to minimize required effort
+;;; for porting Unix-specific software, at least to the level that it
+;;; mostly works most of the time.
+;;;
+;;; Alastair Bridgewater recommended to switch away from CRT
+;;; descriptors, and Anton Kovalenko thinks it's the time to heed his
+;;; advice. I see that SBCL for Windows needs much more effort in the
+;;; area of OS IO abstractions and the like; using or leaving lowio
+;;; FDs doesn't change the big picture so much.
+;;;
+;;; Lowio layer, in exchange for `semi-automatic almost-portability',
+;;; brings some significant problems, which a grown-up cross-platform
+;;; CL implementation shouldn't have. Therefore, as its benefits
+;;; become negligible, it's a good reason to throw it away.
+;;;
+;;; -- comment from AK's branch
+
+;;; For a few more releases, let's preserve old functions (now
+;;; implemented as identity) for user code which might have had to peek
+;;; into our internals in past versions when we hadn't been using
+;;; handles yet. -- DFL, 2012
+(defun get-osfhandle (fd) fd)
+(defun open-osfhandle (handle flags) (declare (ignore flags)) handle)
+
;;; Get the operating system handle for a C file descriptor. Returns
;;; INVALID-HANDLE on failure.
-(define-alien-routine ("_get_osfhandle" get-osfhandle) handle
+(define-alien-routine ("_get_osfhandle" real-get-osfhandle) handle
+ (fd int))
+
+(define-alien-routine ("_close" real-crt-close) int
(fd int))
;;; Read data from a file handle into a buffer. This may be used
(length dword)
(nevents (* dword)))
+(define-alien-routine ("socket_input_available" socket-input-available) int
+ (socket handle))
+
;;; Listen for input on a Windows file handle. Unlike UNIX, there
;;; isn't a unified interface to do this---we have to know what sort
;;; of handle we have. Of course, there's no way to actually
handle)))
(unless (zerop (peek-named-pipe handle nil 0 nil (addr avail) nil))
(return-from handle-listen (plusp avail)))
-
- (unless (zerop (peek-console-input handle
- (cast buf (* t))
- 1 (addr avail)))
- (return-from handle-listen (plusp avail)))
-
- ;; FIXME-SOCKETS: Try again here with WSAEventSelect in case
- ;; HANDLE is a socket.
+ (let ((res (socket-input-available handle)))
+ (unless (zerop res)
+ (return-from handle-listen (= res 1))))
t))
;;; Listen for input on a C runtime file handle. Returns true if
(zerop (sb!impl::os-wait-for-wtimer timer)))))
(sb!impl::os-close-wtimer timer))))))
+(define-alien-routine ("win32_wait_object_or_signal" wait-object-or-signal)
+ (signed 16)
+ (handle handle))
+
#!+sb-unicode
(progn
(defvar *ansi-codepage* nil)
(defmacro make-system-buffer (x)
`(make-alien char #!+sb-unicode (ash ,x 1) #!-sb-unicode ,x))
+(define-alien-type pathname-buffer
+ (array char #.(ash (1+ max_path) #!+sb-unicode 1 #!-sb-unicode 0)))
+
+(define-alien-type long-pathname-buffer
+ #!+sb-unicode (array char 65536)
+ #!-sb-unicode pathname-buffer)
+
;;; FIXME: The various FOO-SYSCALL-BAR macros, and perhaps some other
;;; macros in this file, are only used in this file, and could be
;;; implemented using SB!XC:DEFMACRO wrapped in EVAL-WHEN.
(alien-funcall afunc aname (addr length))))
(cast-and-free aname))))
-(define-alien-routine ("_lseeki64" lseeki64)
- (signed 64)
- (fd int)
- (position (signed 64))
- (whence int))
-
(define-alien-routine ("SetFilePointerEx" set-file-pointer-ex) lispbool
(handle handle)
(offset long-long)
(new-position long-long :out)
(whence dword))
+(defun lseeki64 (handle offset whence)
+ (multiple-value-bind (moved to-place)
+ (set-file-pointer-ex handle offset whence)
+ (if moved
+ (values to-place 0)
+ (values -1 (- (get-last-error))))))
+
;; File mapping support routines
(define-alien-routine (#!+sb-unicode "CreateFileMappingW"
#!-sb-unicode "CreateFileMappingA"
(defconstant file-flag-overlapped #x40000000)
(defconstant file-flag-sequential-scan #x8000000)
+;; Possible results of GetFileType.
+(defconstant file-type-disk 1)
+(defconstant file-type-char 2)
+(defconstant file-type-pipe 3)
+(defconstant file-type-remote 4)
+(defconstant file-type-unknown 0)
+
+(defconstant invalid-file-attributes (mod -1 (ash 1 32)))
+
+;;;; File Type Introspection by handle
+(define-alien-routine ("GetFileType" get-file-type) dword
+ (handle handle))
+
;; GetFileAttribute is like a tiny subset of fstat(),
;; enough to distinguish directories from anything else.
(define-alien-routine (#!+sb-unicode "GetFileAttributesW"
(define-alien-routine ("CloseHandle" close-handle) bool
(handle handle))
-(define-alien-routine ("_open_osfhandle" open-osfhandle)
+(define-alien-routine ("_open_osfhandle" real-open-osfhandle)
int
(handle handle)
(flags int))
;; -- DFL
;;
(set-file-pointer-ex handle 0 (if (plusp (logand sb!unix::o_append flags)) 2 0))
- (let ((fd (open-osfhandle handle (logior sb!unix::o_binary flags))))
- (if (minusp fd)
- (values nil (sb!unix::get-errno))
- (values fd 0))))))))
+ (values handle 0))))))
(define-alien-routine ("closesocket" close-socket) int (handle handle))
(define-alien-routine ("shutdown" shutdown-socket) int (handle handle)
;;; ...Seems to be the problem on some OSes, though. We could
;;; duplicate a handle and attempt close-socket on a duplicated one,
;;; but it also have some problems...
-;;;
-;;; For now, we protect socket handle from close with SetHandleInformation,
-;;; then call CRT _close() that fails to close a handle but _gets rid of fd_,
-;;; and then we close a handle ourserves.
(defun unixlike-close (fd)
- (let ((handle (get-osfhandle fd)))
- (flet ((close-protection (enable)
- (set-handle-information handle 2 (if enable 2 0))))
- (if (= handle invalid-handle)
- (values nil ebadf)
- (progn
- (when (and (socket-handle-p handle) (close-protection t))
- (shutdown-socket handle 2)
- (alien-funcall (extern-alien "_dup2" (function int int int)) 0 fd)
- (close-protection nil)
- (close-socket handle))
- (sb!unix::void-syscall ("_close" int) fd))))))
+ (if (or (zerop (close-socket fd))
+ (close-handle fd))
+ t (values nil ebadf)))
+
+(defconstant +std-input-handle+ -10)
+(defconstant +std-output-handle+ -11)
+(defconstant +std-error-handle+ -12)
+
+(defun get-std-handle-or-null (identity)
+ (let ((handle (alien-funcall
+ (extern-alien "GetStdHandle" (function handle dword))
+ (logand (1- (ash 1 (alien-size dword))) identity))))
+ (and (/= handle invalid-handle)
+ (not (zerop handle))
+ handle)))
+
+(defun get-std-handles ()
+ (values (get-std-handle-or-null +std-input-handle+)
+ (get-std-handle-or-null +std-output-handle+)
+ (get-std-handle-or-null +std-error-handle+)))
+
+(defconstant +duplicate-same-access+ 2)
+
+(defun duplicate-and-unwrap-fd (fd &key inheritp)
+ (let ((me (get-current-process)))
+ (multiple-value-bind (duplicated handle)
+ (duplicate-handle me (real-get-osfhandle fd)
+ me 0 inheritp +duplicate-same-access+)
+ (if duplicated
+ (prog1 handle (real-crt-close fd))
+ (win32-error 'duplicate-and-unwrap-fd)))))
+
+(define-alien-routine ("CreatePipe" create-pipe) lispbool
+ (read-pipe handle :out)
+ (write-pipe handle :out)
+ (security-attributes (* t))
+ (buffer-size dword))
+
+(defun windows-pipe ()
+ (multiple-value-bind (created read-handle write-handle)
+ (create-pipe nil 256)
+ (if created (values read-handle write-handle)
+ (win32-error 'create-pipe))))
+
+(defun windows-isatty (handle)
+ (if (= file-type-char (get-file-type handle))
+ 1 0))
+
+(defun inheritable-handle-p (handle)
+ (multiple-value-bind (got flags)
+ (get-handle-information handle)
+ (if got (plusp (logand flags +handle-flag-inherit+))
+ (win32-error 'inheritable-handle-p))))
+
+(defun (setf inheritable-handle-p) (allow handle)
+ (if (set-handle-information handle
+ +handle-flag-inherit+
+ (if allow +handle-flag-inherit+ 0))
+ allow
+ (win32-error '(setf inheritable-handle-p))))
+
+(defun sb!unix:unix-dup (fd)
+ (let ((me (get-current-process)))
+ (multiple-value-bind (duplicated handle)
+ (duplicate-handle me fd me 0 t +duplicate-same-access+)
+ (if duplicated
+ (values handle 0)
+ (values nil (- (get-last-error)))))))
+
+(defun call-with-crt-fd (thunk handle &optional (flags 0))
+ (multiple-value-bind (duplicate errno)
+ (sb!unix:unix-dup handle)
+ (if duplicate
+ (let ((fd (real-open-osfhandle duplicate flags)))
+ (unwind-protect (funcall thunk fd)
+ (real-crt-close fd)))
+ (values nil errno))))
projects / sbcl.git / blobdiff