1 ;;;; streams for UNIX file descriptors
3 ;;;; This software is part of the SBCL system. See the README file for
6 ;;;; This software is derived from the CMU CL system, which was
7 ;;;; written at Carnegie Mellon University and released into the
8 ;;;; public domain. The software is in the public domain and is
9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
10 ;;;; files for more information.
12 (in-package "SB!IMPL")
14 ;;;; buffer manipulation routines
16 ;;; FIXME: Is it really good to maintain this pool separate from the
17 ;;; GC and the C malloc logic?
18 (defvar *available-buffers* ()
20 "List of available buffers. Each buffer is an sap pointing to
21 bytes-per-buffer of memory.")
23 (defvar *available-buffers-mutex* (sb!thread:make-mutex
24 :name "lock for *AVAILABLE-BUFFERS*")
26 "Mutex for access to *AVAILABLE-BUFFERS*.")
28 (defmacro with-available-buffers-lock ((&optional) &body body)
29 ;; CALL-WITH-SYSTEM-MUTEX because streams are low-level enough to be
30 ;; async signal safe, and in particular a C-c that brings up the
31 ;; debugger while holding the mutex would lose badly
32 `(sb!thread::call-with-system-mutex (lambda () ,@body)
33 *available-buffers-mutex*))
35 (defconstant bytes-per-buffer (* 4 1024)
37 "Number of bytes per buffer.")
39 ;;; Return the next available buffer, creating one if necessary.
40 #!-sb-fluid (declaim (inline next-available-buffer))
41 (defun next-available-buffer ()
42 (with-available-buffers-lock ()
43 (if *available-buffers*
44 (pop *available-buffers*)
45 (allocate-system-memory bytes-per-buffer))))
47 ;;;; the FD-STREAM structure
50 (:constructor %make-fd-stream)
51 (:conc-name fd-stream-)
52 (:predicate fd-stream-p)
54 (misc #'fd-stream-misc-routine))
57 ;; the name of this stream
59 ;; the file this stream is for
61 ;; the backup file namestring for the old file, for :IF-EXISTS
62 ;; :RENAME or :RENAME-AND-DELETE.
63 (original nil :type (or simple-string null))
64 (delete-original nil) ; for :if-exists :rename-and-delete
65 ;;; the number of bytes per element
66 (element-size 1 :type index)
67 ;; the type of element being transfered
68 (element-type 'base-char)
69 ;; the Unix file descriptor
71 ;; controls when the output buffer is flushed
72 (buffering :full :type (member :full :line :none))
73 ;; controls whether the input buffer must be cleared before output
74 ;; (must be done for files, not for sockets, pipes and other data
75 ;; sources where input and output aren't related). non-NIL means
76 ;; don't clear input buffer.
78 ;; character position if known -- this may run into bignums, but
79 ;; we probably should flip it into null then for efficiency's sake...
80 (char-pos nil :type (or unsigned-byte null))
81 ;; T if input is waiting on FD. :EOF if we hit EOF.
82 (listen nil :type (member nil t :eof))
86 (ibuf-sap nil :type (or system-area-pointer null))
87 (ibuf-length nil :type (or index null))
88 (ibuf-head 0 :type index)
89 (ibuf-tail 0 :type index)
92 (obuf-sap nil :type (or system-area-pointer null))
93 (obuf-length nil :type (or index null))
94 (obuf-tail 0 :type index)
96 ;; output flushed, but not written due to non-blocking io?
99 ;; timeout specified for this stream as seconds or NIL if none
100 (timeout nil :type (or single-float null))
101 ;; pathname of the file this stream is opened to (returned by PATHNAME)
102 (pathname nil :type (or pathname null))
103 (external-format :default)
104 (output-bytes #'ill-out :type function))
105 (def!method print-object ((fd-stream fd-stream) stream)
106 (declare (type stream stream))
107 (print-unreadable-object (fd-stream stream :type t :identity t)
108 (format stream "for ~S" (fd-stream-name fd-stream))))
110 ;;;; output routines and related noise
112 (defvar *output-routines* ()
114 "List of all available output routines. Each element is a list of the
115 element-type output, the kind of buffering, the function name, and the number
116 of bytes per element.")
118 ;;; common idioms for reporting low-level stream and file problems
119 (defun simple-stream-perror (note-format stream errno)
120 (error 'simple-stream-error
122 :format-control "~@<~?: ~2I~_~A~:>"
123 :format-arguments (list note-format (list stream) (strerror errno))))
124 (defun simple-file-perror (note-format pathname errno)
125 (error 'simple-file-error
127 :format-control "~@<~?: ~2I~_~A~:>"
129 (list note-format (list pathname) (strerror errno))))
131 (defun stream-decoding-error (stream octets)
132 (error 'stream-decoding-error
134 ;; FIXME: dunno how to get at OCTETS currently, or even if
135 ;; that's the right thing to report.
137 (defun stream-encoding-error (stream code)
138 (error 'stream-encoding-error
142 (defun c-string-encoding-error (external-format code)
143 (error 'c-string-encoding-error
144 :external-format external-format
147 (defun c-string-decoding-error (external-format octets)
148 (error 'c-string-decoding-error
149 :external-format external-format
152 ;;; Returning true goes into end of file handling, false will enter another
153 ;;; round of input buffer filling followed by re-entering character decode.
154 (defun stream-decoding-error-and-handle (stream octet-count)
156 (stream-decoding-error stream
157 (let ((sap (fd-stream-ibuf-sap stream))
158 (head (fd-stream-ibuf-head stream)))
159 (loop for i from 0 below octet-count
160 collect (sap-ref-8 sap (+ head i)))))
162 :report (lambda (stream)
164 "~@<Attempt to resync the stream at a character ~
165 character boundary and continue.~@:>"))
166 (fd-stream-resync stream)
168 (force-end-of-file ()
169 :report (lambda (stream)
170 (format stream "~@<Force an end of file.~@:>"))
173 (defun stream-encoding-error-and-handle (stream code)
175 (stream-encoding-error stream code)
177 :report (lambda (stream)
178 (format stream "~@<Skip output of this character.~@:>"))
179 (throw 'output-nothing nil))))
181 (defun external-format-encoding-error (stream code)
183 (stream-encoding-error-and-handle stream code)
184 (c-string-encoding-error stream code)))
186 (defun external-format-decoding-error (stream octet-count)
188 (stream-decoding-error stream octet-count)
189 (c-string-decoding-error stream octet-count)))
191 ;;; This is called by the server when we can write to the given file
192 ;;; descriptor. Attempt to write the data again. If it worked, remove
193 ;;; the data from the OUTPUT-LATER list. If it didn't work, something
195 (defun frob-output-later (stream)
196 (let* ((stuff (pop (fd-stream-output-later stream)))
200 (reuse-sap (cadddr stuff))
201 (length (- end start)))
202 (declare (type index start end length))
203 (multiple-value-bind (count errno)
204 (sb!unix:unix-write (fd-stream-fd stream)
210 (simple-stream-perror "couldn't write to ~S" stream errno)
212 (if (= errno sb!unix:ewouldblock)
213 (error "Write would have blocked, but SERVER told us to go.")
214 (simple-stream-perror "couldn't write to ~S" stream errno)))
215 ((eql count length) ; Hot damn, it worked.
217 (with-available-buffers-lock ()
218 (push base *available-buffers*))))
219 ((not (null count)) ; sorta worked..
221 (the index (+ start count))
223 (fd-stream-output-later stream))))))
224 (unless (fd-stream-output-later stream)
225 (remove-fd-handler (fd-stream-handler stream))
226 (setf (fd-stream-handler stream) nil)))
228 ;;; Arange to output the string when we can write on the file descriptor.
229 (defun output-later (stream base start end reuse-sap)
230 (cond ((null (fd-stream-output-later stream))
231 (setf (fd-stream-output-later stream)
232 (list (list base start end reuse-sap)))
233 (setf (fd-stream-handler stream)
234 (add-fd-handler (fd-stream-fd stream)
237 (declare (ignore fd))
238 (frob-output-later stream)))))
240 (nconc (fd-stream-output-later stream)
241 (list (list base start end reuse-sap)))))
243 (let ((new-buffer (next-available-buffer)))
244 (setf (fd-stream-obuf-sap stream) new-buffer)
245 (setf (fd-stream-obuf-length stream) bytes-per-buffer))))
247 ;;; Output the given noise. Check to see whether there are any pending
248 ;;; writes. If so, just queue this one. Otherwise, try to write it. If
249 ;;; this would block, queue it.
250 (defun frob-output (stream base start end reuse-sap)
251 (declare (type fd-stream stream)
252 (type (or system-area-pointer (simple-array * (*))) base)
253 (type index start end))
254 (if (not (null (fd-stream-output-later stream))) ; something buffered.
255 (output-later stream base start end reuse-sap)
256 ;; ### check to see whether any of this noise can be output
257 (let ((length (- end start)))
258 (multiple-value-bind (count errno)
259 (sb!unix:unix-write (fd-stream-fd stream) base start length)
262 (simple-stream-perror "Couldn't write to ~S" stream errno)
264 (if (= errno sb!unix:ewouldblock)
265 (output-later stream base start end reuse-sap)
266 (simple-stream-perror "Couldn't write to ~S"
268 ((not (eql count length))
269 (output-later stream base (the index (+ start count))
272 ;;; Flush any data in the output buffer.
273 (defun flush-output-buffer (stream)
274 (let ((length (fd-stream-obuf-tail stream)))
276 (frob-output stream (fd-stream-obuf-sap stream) 0 length t)
277 (setf (fd-stream-obuf-tail stream) 0))))
279 (defun fd-stream-output-finished-p (stream)
280 (and (zerop (fd-stream-obuf-tail stream))
281 (not (fd-stream-output-later stream))))
283 (defmacro output-wrapper/variable-width ((stream size buffering restart)
285 (let ((stream-var (gensym)))
286 `(let ((,stream-var ,stream)
288 ,(unless (eq (car buffering) :none)
289 `(when (< (fd-stream-obuf-length ,stream-var)
290 (+ (fd-stream-obuf-tail ,stream-var)
292 (flush-output-buffer ,stream-var)))
293 ,(unless (eq (car buffering) :none)
294 `(when (and (not (fd-stream-dual-channel-p ,stream-var))
295 (> (fd-stream-ibuf-tail ,stream-var)
296 (fd-stream-ibuf-head ,stream-var)))
297 (file-position ,stream-var (file-position ,stream-var))))
299 `(catch 'output-nothing
301 (incf (fd-stream-obuf-tail ,stream-var) size))
304 (incf (fd-stream-obuf-tail ,stream-var) size)))
305 ,(ecase (car buffering)
307 `(flush-output-buffer ,stream-var))
309 `(when (eq (char-code byte) (char-code #\Newline))
310 (flush-output-buffer ,stream-var)))
314 (defmacro output-wrapper ((stream size buffering restart) &body body)
315 (let ((stream-var (gensym)))
316 `(let ((,stream-var ,stream))
317 ,(unless (eq (car buffering) :none)
318 `(when (< (fd-stream-obuf-length ,stream-var)
319 (+ (fd-stream-obuf-tail ,stream-var)
321 (flush-output-buffer ,stream-var)))
322 ,(unless (eq (car buffering) :none)
323 `(when (and (not (fd-stream-dual-channel-p ,stream-var))
324 (> (fd-stream-ibuf-tail ,stream-var)
325 (fd-stream-ibuf-head ,stream-var)))
326 (file-position ,stream-var (file-position ,stream-var))))
328 `(catch 'output-nothing
330 (incf (fd-stream-obuf-tail ,stream-var) ,size))
333 (incf (fd-stream-obuf-tail ,stream-var) ,size)))
334 ,(ecase (car buffering)
336 `(flush-output-buffer ,stream-var))
338 `(when (eq (char-code byte) (char-code #\Newline))
339 (flush-output-buffer ,stream-var)))
343 (defmacro def-output-routines/variable-width
344 ((name-fmt size restart external-format &rest bufferings)
346 (declare (optimize (speed 1)))
351 (intern (format nil name-fmt (string (car buffering))))))
353 (defun ,function (stream byte)
354 (declare (ignorable byte))
355 (output-wrapper/variable-width (stream ,size ,buffering ,restart)
357 (setf *output-routines*
358 (nconc *output-routines*
366 (cdr buffering)))))))
369 ;;; Define output routines that output numbers SIZE bytes long for the
370 ;;; given bufferings. Use BODY to do the actual output.
371 (defmacro def-output-routines ((name-fmt size restart &rest bufferings)
373 (declare (optimize (speed 1)))
378 (intern (format nil name-fmt (string (car buffering))))))
380 (defun ,function (stream byte)
381 (output-wrapper (stream ,size ,buffering ,restart)
383 (setf *output-routines*
384 (nconc *output-routines*
392 (cdr buffering)))))))
395 ;;; FIXME: is this used anywhere any more?
396 (def-output-routines ("OUTPUT-CHAR-~A-BUFFERED"
402 (if (char= byte #\Newline)
403 (setf (fd-stream-char-pos stream) 0)
404 (incf (fd-stream-char-pos stream)))
405 (setf (sap-ref-8 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
408 (def-output-routines ("OUTPUT-UNSIGNED-BYTE-~A-BUFFERED"
411 (:none (unsigned-byte 8))
412 (:full (unsigned-byte 8)))
413 (setf (sap-ref-8 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
416 (def-output-routines ("OUTPUT-SIGNED-BYTE-~A-BUFFERED"
419 (:none (signed-byte 8))
420 (:full (signed-byte 8)))
421 (setf (signed-sap-ref-8 (fd-stream-obuf-sap stream)
422 (fd-stream-obuf-tail stream))
425 (def-output-routines ("OUTPUT-UNSIGNED-SHORT-~A-BUFFERED"
428 (:none (unsigned-byte 16))
429 (:full (unsigned-byte 16)))
430 (setf (sap-ref-16 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
433 (def-output-routines ("OUTPUT-SIGNED-SHORT-~A-BUFFERED"
436 (:none (signed-byte 16))
437 (:full (signed-byte 16)))
438 (setf (signed-sap-ref-16 (fd-stream-obuf-sap stream)
439 (fd-stream-obuf-tail stream))
442 (def-output-routines ("OUTPUT-UNSIGNED-LONG-~A-BUFFERED"
445 (:none (unsigned-byte 32))
446 (:full (unsigned-byte 32)))
447 (setf (sap-ref-32 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
450 (def-output-routines ("OUTPUT-SIGNED-LONG-~A-BUFFERED"
453 (:none (signed-byte 32))
454 (:full (signed-byte 32)))
455 (setf (signed-sap-ref-32 (fd-stream-obuf-sap stream)
456 (fd-stream-obuf-tail stream))
459 #+#.(cl:if (cl:= sb!vm:n-word-bits 64) '(and) '(or))
461 (def-output-routines ("OUTPUT-UNSIGNED-LONG-LONG-~A-BUFFERED"
464 (:none (unsigned-byte 64))
465 (:full (unsigned-byte 64)))
466 (setf (sap-ref-64 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
468 (def-output-routines ("OUTPUT-SIGNED-LONG-LONG-~A-BUFFERED"
471 (:none (signed-byte 64))
472 (:full (signed-byte 64)))
473 (setf (signed-sap-ref-64 (fd-stream-obuf-sap stream)
474 (fd-stream-obuf-tail stream))
477 ;;; Do the actual output. If there is space to buffer the string,
478 ;;; buffer it. If the string would normally fit in the buffer, but
479 ;;; doesn't because of other stuff in the buffer, flush the old noise
480 ;;; out of the buffer and put the string in it. Otherwise we have a
481 ;;; very long string, so just send it directly (after flushing the
482 ;;; buffer, of course).
483 (defun output-raw-bytes (fd-stream thing &optional start end)
485 "Output THING to FD-STREAM. THING can be any kind of vector or a SAP. If
486 THING is a SAP, END must be supplied (as length won't work)."
487 (let ((start (or start 0))
488 (end (or end (length (the (simple-array * (*)) thing)))))
489 (declare (type index start end))
490 (when (and (not (fd-stream-dual-channel-p fd-stream))
491 (> (fd-stream-ibuf-tail fd-stream)
492 (fd-stream-ibuf-head fd-stream)))
493 (file-position fd-stream (file-position fd-stream)))
494 (let* ((len (fd-stream-obuf-length fd-stream))
495 (tail (fd-stream-obuf-tail fd-stream))
497 (bytes (- end start))
498 (newtail (+ tail bytes)))
499 (cond ((minusp bytes) ; error case
500 (error ":END before :START!"))
501 ((zerop bytes)) ; easy case
503 (if (system-area-pointer-p thing)
504 (system-area-ub8-copy thing start
505 (fd-stream-obuf-sap fd-stream)
508 ;; FIXME: There should be some type checking somewhere to
509 ;; verify that THING here is a vector, not just <not a SAP>.
510 (copy-ub8-to-system-area thing start
511 (fd-stream-obuf-sap fd-stream)
514 (setf (fd-stream-obuf-tail fd-stream) newtail))
516 (flush-output-buffer fd-stream)
517 (if (system-area-pointer-p thing)
518 (system-area-ub8-copy thing
520 (fd-stream-obuf-sap fd-stream)
523 ;; FIXME: There should be some type checking somewhere to
524 ;; verify that THING here is a vector, not just <not a SAP>.
525 (copy-ub8-to-system-area thing
527 (fd-stream-obuf-sap fd-stream)
530 (setf (fd-stream-obuf-tail fd-stream) bytes))
532 (flush-output-buffer fd-stream)
533 (frob-output fd-stream thing start end nil))))))
535 ;;; the routine to use to output a string. If the stream is
536 ;;; unbuffered, slam the string down the file descriptor, otherwise
537 ;;; use OUTPUT-RAW-BYTES to buffer the string. Update charpos by
538 ;;; checking to see where the last newline was.
539 (defun fd-sout (stream thing start end)
540 (declare (type fd-stream stream) (type string thing))
541 (let ((start (or start 0))
542 (end (or end (length (the vector thing)))))
543 (declare (fixnum start end))
545 (string-dispatch (simple-base-string
547 (simple-array character (*))
550 (position #\newline thing :from-end t
551 :start start :end end))))
552 (if (and (typep thing 'base-string)
553 (eq (fd-stream-external-format stream) :latin-1))
554 (ecase (fd-stream-buffering stream)
556 (output-raw-bytes stream thing start end))
558 (output-raw-bytes stream thing start end)
560 (flush-output-buffer stream)))
562 (frob-output stream thing start end nil)))
563 (ecase (fd-stream-buffering stream)
564 (:full (funcall (fd-stream-output-bytes stream)
565 stream thing nil start end))
566 (:line (funcall (fd-stream-output-bytes stream)
567 stream thing last-newline start end))
568 (:none (funcall (fd-stream-output-bytes stream)
569 stream thing t start end))))
571 (setf (fd-stream-char-pos stream) (- end last-newline 1))
572 (incf (fd-stream-char-pos stream) (- end start))))))
574 (defvar *external-formats* ()
576 "List of all available external formats. Each element is a list of the
577 element-type, string input function name, character input function name,
578 and string output function name.")
580 (defun get-external-format (external-format)
581 (dolist (entry *external-formats*)
582 (when (member external-format (first entry))
585 (defun get-external-format-function (external-format index)
586 (let ((entry (get-external-format external-format)))
587 (when entry (nth index entry))))
589 ;;; Find an output routine to use given the type and buffering. Return
590 ;;; as multiple values the routine, the real type transfered, and the
591 ;;; number of bytes per element.
592 (defun pick-output-routine (type buffering &optional external-format)
593 (when (subtypep type 'character)
594 (let ((entry (get-external-format external-format)))
596 (return-from pick-output-routine
597 (values (symbol-function (nth (ecase buffering
604 (symbol-function (fourth entry))
605 (first (first entry)))))))
606 (dolist (entry *output-routines*)
607 (when (and (subtypep type (first entry))
608 (eq buffering (second entry))
609 (or (not (fifth entry))
610 (eq external-format (fifth entry))))
611 (return-from pick-output-routine
612 (values (symbol-function (third entry))
615 ;; KLUDGE: dealing with the buffering here leads to excessive code
618 ;; KLUDGE: also see comments in PICK-INPUT-ROUTINE
619 (loop for i from 40 by 8 to 1024 ; ARB (KLUDGE)
620 if (subtypep type `(unsigned-byte ,i))
621 do (return-from pick-output-routine
625 (lambda (stream byte)
626 (output-wrapper (stream (/ i 8) (:none) nil)
627 (loop for j from 0 below (/ i 8)
629 (fd-stream-obuf-sap stream)
630 (+ j (fd-stream-obuf-tail stream)))
631 (ldb (byte 8 (- i 8 (* j 8))) byte))))))
633 (lambda (stream byte)
634 (output-wrapper (stream (/ i 8) (:full) nil)
635 (loop for j from 0 below (/ i 8)
637 (fd-stream-obuf-sap stream)
638 (+ j (fd-stream-obuf-tail stream)))
639 (ldb (byte 8 (- i 8 (* j 8))) byte)))))))
642 (loop for i from 40 by 8 to 1024 ; ARB (KLUDGE)
643 if (subtypep type `(signed-byte ,i))
644 do (return-from pick-output-routine
648 (lambda (stream byte)
649 (output-wrapper (stream (/ i 8) (:none) nil)
650 (loop for j from 0 below (/ i 8)
652 (fd-stream-obuf-sap stream)
653 (+ j (fd-stream-obuf-tail stream)))
654 (ldb (byte 8 (- i 8 (* j 8))) byte))))))
656 (lambda (stream byte)
657 (output-wrapper (stream (/ i 8) (:full) nil)
658 (loop for j from 0 below (/ i 8)
660 (fd-stream-obuf-sap stream)
661 (+ j (fd-stream-obuf-tail stream)))
662 (ldb (byte 8 (- i 8 (* j 8))) byte)))))))
666 ;;;; input routines and related noise
668 ;;; a list of all available input routines. Each element is a list of
669 ;;; the element-type input, the function name, and the number of bytes
671 (defvar *input-routines* ())
673 ;;; Return whether a primitive partial read operation on STREAM's FD
674 ;;; would (probably) block. Signal a `simple-stream-error' if the
675 ;;; system call implementing this operation fails.
677 ;;; It is "may" instead of "would" because "would" is not quite
678 ;;; correct on win32. However, none of the places that use it require
679 ;;; further assurance than "may" versus "will definitely not".
680 (defun sysread-may-block-p (stream)
682 ;; This answers T at EOF on win32, I think.
683 (not (sb!win32:fd-listen (fd-stream-fd stream)))
685 (sb!unix:with-restarted-syscall (count errno)
686 (sb!alien:with-alien ((read-fds (sb!alien:struct sb!unix:fd-set)))
687 (sb!unix:fd-zero read-fds)
688 (sb!unix:fd-set (fd-stream-fd stream) read-fds)
689 (sb!unix:unix-fast-select (1+ (fd-stream-fd stream))
690 (sb!alien:addr read-fds)
696 (simple-stream-perror "couldn't check whether ~S is readable"
700 ;;; If the read would block wait (using SERVE-EVENT) till input is available,
701 ;;; then fill the input buffer, and return the number of bytes read. Throws
702 ;;; to EOF-INPUT-CATCHER if the eof was reached.
703 (defun refill-buffer/fd (stream)
704 (let ((fd (fd-stream-fd stream))
708 ;; Check for blocking input before touching the stream, as if
709 ;; we happen to wait we are liable to be interrupted, and the
710 ;; interrupt handler may use the same stream.
711 (if (sysread-may-block-p stream)
714 ;; These (:CLOSED-FLAME and :READ-ERROR) tags are here so what
715 ;; we can signal errors outside the WITHOUT-INTERRUPTS.
717 (closed-flame stream)
719 (simple-stream-perror "couldn't read from ~S" stream errno)
721 ;; This tag is here so we can unwind outside the WITHOUT-INTERRUPTS
722 ;; to wait for input if read tells us EWOULDBLOCK.
723 (unless (wait-until-fd-usable fd :input (fd-stream-timeout stream))
724 (signal-timeout 'io-timeout :stream stream :direction :read
725 :seconds (fd-stream-timeout stream)))
727 ;; Since the read should not block, we'll disable the
728 ;; interrupts here, so that we don't accidentally unwind and
729 ;; leave the stream in an inconsistent state.
731 (let ((ibuf-sap (fd-stream-ibuf-sap stream))
732 (buflen (fd-stream-ibuf-length stream))
733 (head (fd-stream-ibuf-head stream))
734 (tail (fd-stream-ibuf-tail stream)))
735 (declare (type index head tail))
736 ;; Check the SAP: if it is null, then someone has closed
737 ;; the stream from underneath us. This is not ment to fix
738 ;; multithreaded races, but to deal with interrupt handlers
739 ;; closing the stream.
743 (cond ((eql head tail)
746 (fd-stream-ibuf-head stream) 0
747 (fd-stream-ibuf-tail stream) 0))
750 (system-area-ub8-copy ibuf-sap head
753 (fd-stream-ibuf-head stream) 0
754 (fd-stream-ibuf-tail stream) tail))))
755 (setf (fd-stream-listen stream) nil)
756 (setf (values count errno)
757 (sb!unix:unix-read fd (int-sap (+ (sap-int ibuf-sap) tail))
763 (if (eql errno sb!unix:ewouldblock)
767 (setf (fd-stream-listen stream) :eof)
768 (/show0 "THROWing EOF-INPUT-CATCHER")
769 (throw 'eof-input-catcher nil))
772 (incf (fd-stream-ibuf-tail stream) count))))))
775 ;;; Make sure there are at least BYTES number of bytes in the input
776 ;;; buffer. Keep calling REFILL-BUFFER/FD until that condition is met.
777 (defmacro input-at-least (stream bytes)
778 (let ((stream-var (gensym))
779 (bytes-var (gensym)))
780 `(let ((,stream-var ,stream)
783 (when (>= (- (fd-stream-ibuf-tail ,stream-var)
784 (fd-stream-ibuf-head ,stream-var))
787 (refill-buffer/fd ,stream-var)))))
789 (defmacro input-wrapper/variable-width ((stream bytes eof-error eof-value)
791 (let ((stream-var (gensym))
793 (element-var (gensym)))
794 `(let ((,stream-var ,stream)
796 (if (fd-stream-unread ,stream-var)
798 (fd-stream-unread ,stream-var)
799 (setf (fd-stream-unread ,stream-var) nil)
800 (setf (fd-stream-listen ,stream-var) nil))
801 (let ((,element-var nil)
802 (decode-break-reason nil))
806 (catch 'eof-input-catcher
807 (setf decode-break-reason
808 (block decode-break-reason
809 (input-at-least ,stream-var 1)
810 (let* ((byte (sap-ref-8 (fd-stream-ibuf-sap
814 (declare (ignorable byte))
816 (input-at-least ,stream-var size)
817 (setq ,element-var (locally ,@read-forms))
818 (setq ,retry-var nil))
820 (when decode-break-reason
821 (stream-decoding-error-and-handle stream
822 decode-break-reason))
824 (let ((octet-count (- (fd-stream-ibuf-tail ,stream-var)
825 (fd-stream-ibuf-head ,stream-var))))
826 (when (or (zerop octet-count)
827 (and (not ,element-var)
828 (not decode-break-reason)
829 (stream-decoding-error-and-handle
830 stream octet-count)))
831 (setq ,retry-var nil)))))
833 (incf (fd-stream-ibuf-head ,stream-var) size)
836 (eof-or-lose ,stream-var ,eof-error ,eof-value))))))))
838 ;;; a macro to wrap around all input routines to handle EOF-ERROR noise
839 (defmacro input-wrapper ((stream bytes eof-error eof-value) &body read-forms)
840 (let ((stream-var (gensym))
841 (element-var (gensym)))
842 `(let ((,stream-var ,stream))
843 (if (fd-stream-unread ,stream-var)
845 (fd-stream-unread ,stream-var)
846 (setf (fd-stream-unread ,stream-var) nil)
847 (setf (fd-stream-listen ,stream-var) nil))
849 (catch 'eof-input-catcher
850 (input-at-least ,stream-var ,bytes)
851 (locally ,@read-forms))))
853 (incf (fd-stream-ibuf-head ,stream-var) ,bytes)
856 (eof-or-lose ,stream-var ,eof-error ,eof-value))))))))
858 (defmacro def-input-routine/variable-width (name
859 (type external-format size sap head)
862 (defun ,name (stream eof-error eof-value)
863 (input-wrapper/variable-width (stream ,size eof-error eof-value)
864 (let ((,sap (fd-stream-ibuf-sap stream))
865 (,head (fd-stream-ibuf-head stream)))
867 (setf *input-routines*
868 (nconc *input-routines*
869 (list (list ',type ',name 1 ',external-format))))))
871 (defmacro def-input-routine (name
875 (defun ,name (stream eof-error eof-value)
876 (input-wrapper (stream ,size eof-error eof-value)
877 (let ((,sap (fd-stream-ibuf-sap stream))
878 (,head (fd-stream-ibuf-head stream)))
880 (setf *input-routines*
881 (nconc *input-routines*
882 (list (list ',type ',name ',size nil))))))
884 ;;; STREAM-IN routine for reading a string char
885 (def-input-routine input-character
886 (character 1 sap head)
887 (code-char (sap-ref-8 sap head)))
889 ;;; STREAM-IN routine for reading an unsigned 8 bit number
890 (def-input-routine input-unsigned-8bit-byte
891 ((unsigned-byte 8) 1 sap head)
892 (sap-ref-8 sap head))
894 ;;; STREAM-IN routine for reading a signed 8 bit number
895 (def-input-routine input-signed-8bit-number
896 ((signed-byte 8) 1 sap head)
897 (signed-sap-ref-8 sap head))
899 ;;; STREAM-IN routine for reading an unsigned 16 bit number
900 (def-input-routine input-unsigned-16bit-byte
901 ((unsigned-byte 16) 2 sap head)
902 (sap-ref-16 sap head))
904 ;;; STREAM-IN routine for reading a signed 16 bit number
905 (def-input-routine input-signed-16bit-byte
906 ((signed-byte 16) 2 sap head)
907 (signed-sap-ref-16 sap head))
909 ;;; STREAM-IN routine for reading a unsigned 32 bit number
910 (def-input-routine input-unsigned-32bit-byte
911 ((unsigned-byte 32) 4 sap head)
912 (sap-ref-32 sap head))
914 ;;; STREAM-IN routine for reading a signed 32 bit number
915 (def-input-routine input-signed-32bit-byte
916 ((signed-byte 32) 4 sap head)
917 (signed-sap-ref-32 sap head))
919 #+#.(cl:if (cl:= sb!vm:n-word-bits 64) '(and) '(or))
921 (def-input-routine input-unsigned-64bit-byte
922 ((unsigned-byte 64) 8 sap head)
923 (sap-ref-64 sap head))
924 (def-input-routine input-signed-64bit-byte
925 ((signed-byte 64) 8 sap head)
926 (signed-sap-ref-64 sap head)))
928 ;;; Find an input routine to use given the type. Return as multiple
929 ;;; values the routine, the real type transfered, and the number of
930 ;;; bytes per element (and for character types string input routine).
931 (defun pick-input-routine (type &optional external-format)
932 (when (subtypep type 'character)
933 (dolist (entry *external-formats*)
934 (when (member external-format (first entry))
935 (return-from pick-input-routine
936 (values (symbol-function (third entry))
939 (symbol-function (second entry))
940 (first (first entry)))))))
941 (dolist (entry *input-routines*)
942 (when (and (subtypep type (first entry))
943 (or (not (fourth entry))
944 (eq external-format (fourth entry))))
945 (return-from pick-input-routine
946 (values (symbol-function (second entry))
949 ;; FIXME: let's do it the hard way, then (but ignore things like
950 ;; endianness, efficiency, and the necessary coupling between these
951 ;; and the output routines). -- CSR, 2004-02-09
952 (loop for i from 40 by 8 to 1024 ; ARB (well, KLUDGE really)
953 if (subtypep type `(unsigned-byte ,i))
954 do (return-from pick-input-routine
956 (lambda (stream eof-error eof-value)
957 (input-wrapper (stream (/ i 8) eof-error eof-value)
958 (let ((sap (fd-stream-ibuf-sap stream))
959 (head (fd-stream-ibuf-head stream)))
960 (loop for j from 0 below (/ i 8)
964 (sap-ref-8 sap (+ head j))))
965 finally (return result)))))
968 (loop for i from 40 by 8 to 1024 ; ARB (well, KLUDGE really)
969 if (subtypep type `(signed-byte ,i))
970 do (return-from pick-input-routine
972 (lambda (stream eof-error eof-value)
973 (input-wrapper (stream (/ i 8) eof-error eof-value)
974 (let ((sap (fd-stream-ibuf-sap stream))
975 (head (fd-stream-ibuf-head stream)))
976 (loop for j from 0 below (/ i 8)
980 (sap-ref-8 sap (+ head j))))
981 finally (return (if (logbitp (1- i) result)
982 (dpb result (byte i 0) -1)
987 ;;; Return a string constructed from SAP, START, and END.
988 (defun string-from-sap (sap start end)
989 (declare (type index start end))
990 (let* ((length (- end start))
991 (string (make-string length)))
992 (copy-ub8-from-system-area sap start
997 ;;; the N-BIN method for FD-STREAMs
999 ;;; Note that this blocks in UNIX-READ. It is generally used where
1000 ;;; there is a definite amount of reading to be done, so blocking
1001 ;;; isn't too problematical.
1002 (defun fd-stream-read-n-bytes (stream buffer start requested eof-error-p
1003 &aux (total-copied 0))
1004 (declare (type fd-stream stream))
1005 (declare (type index start requested total-copied))
1006 (let ((unread (fd-stream-unread stream)))
1008 ;; AVERs designed to fail when we have more complicated
1009 ;; character representations.
1010 (aver (typep unread 'base-char))
1011 (aver (= (fd-stream-element-size stream) 1))
1012 ;; KLUDGE: this is a slightly-unrolled-and-inlined version of
1015 (system-area-pointer
1016 (setf (sap-ref-8 buffer start) (char-code unread)))
1017 ((simple-unboxed-array (*))
1018 (setf (aref buffer start) unread)))
1019 (setf (fd-stream-unread stream) nil)
1020 (setf (fd-stream-listen stream) nil)
1021 (incf total-copied)))
1024 (let* ((remaining-request (- requested total-copied))
1025 (head (fd-stream-ibuf-head stream))
1026 (tail (fd-stream-ibuf-tail stream))
1027 (available (- tail head))
1028 (n-this-copy (min remaining-request available))
1029 (this-start (+ start total-copied))
1030 (this-end (+ this-start n-this-copy))
1031 (sap (fd-stream-ibuf-sap stream)))
1032 (declare (type index remaining-request head tail available))
1033 (declare (type index n-this-copy))
1034 ;; Copy data from stream buffer into user's buffer.
1035 (%byte-blt sap head buffer this-start this-end)
1036 (incf (fd-stream-ibuf-head stream) n-this-copy)
1037 (incf total-copied n-this-copy)
1038 ;; Maybe we need to refill the stream buffer.
1039 (cond (;; If there were enough data in the stream buffer, we're done.
1040 (= total-copied requested)
1041 (return total-copied))
1042 (;; If EOF, we're done in another way.
1043 (null (catch 'eof-input-catcher (refill-buffer/fd stream)))
1045 (error 'end-of-file :stream stream)
1046 (return total-copied)))
1047 ;; Otherwise we refilled the stream buffer, so fall
1048 ;; through into another pass of the loop.
1051 (defun fd-stream-resync (stream)
1052 (dolist (entry *external-formats*)
1053 (when (member (fd-stream-external-format stream) (first entry))
1054 (return-from fd-stream-resync
1055 (funcall (symbol-function (eighth entry)) stream)))))
1057 (defun get-fd-stream-character-sizer (stream)
1058 (dolist (entry *external-formats*)
1059 (when (member (fd-stream-external-format stream) (first entry))
1060 (return-from get-fd-stream-character-sizer (ninth entry)))))
1062 (defun fd-stream-character-size (stream char)
1063 (let ((sizer (get-fd-stream-character-sizer stream)))
1064 (when sizer (funcall sizer char))))
1066 (defun fd-stream-string-size (stream string)
1067 (let ((sizer (get-fd-stream-character-sizer stream)))
1069 (loop for char across string summing (funcall sizer char)))))
1071 (defun find-external-format (external-format)
1072 (when external-format
1073 (find external-format *external-formats* :test #'member :key #'car)))
1075 (defun variable-width-external-format-p (ef-entry)
1076 (when (eighth ef-entry) t))
1078 (defun bytes-for-char-fun (ef-entry)
1079 (if ef-entry (symbol-function (ninth ef-entry)) (constantly 1)))
1081 ;;; FIXME: OAOOM here vrt. *EXTERNAL-FORMAT-FUNCTIONS* in fd-stream.lisp
1082 (defmacro define-external-format (external-format size output-restart
1084 (let* ((name (first external-format))
1085 (out-function (symbolicate "OUTPUT-BYTES/" name))
1086 (format (format nil "OUTPUT-CHAR-~A-~~A-BUFFERED" (string name)))
1087 (in-function (symbolicate "FD-STREAM-READ-N-CHARACTERS/" name))
1088 (in-char-function (symbolicate "INPUT-CHAR/" name))
1089 (size-function (symbolicate "BYTES-FOR-CHAR/" name))
1090 (read-c-string-function (symbolicate "READ-FROM-C-STRING/" name))
1091 (output-c-string-function (symbolicate "OUTPUT-TO-C-STRING/" name))
1092 (n-buffer (gensym "BUFFER")))
1094 (defun ,size-function (byte)
1095 (declare (ignore byte))
1097 (defun ,out-function (stream string flush-p start end)
1098 (let ((start (or start 0))
1099 (end (or end (length string))))
1100 (declare (type index start end))
1101 (when (and (not (fd-stream-dual-channel-p stream))
1102 (> (fd-stream-ibuf-tail stream)
1103 (fd-stream-ibuf-head stream)))
1104 (file-position stream (file-position stream)))
1105 (unless (<= 0 start end (length string))
1106 (signal-bounding-indices-bad-error string start end))
1109 (setf (fd-stream-obuf-tail stream)
1110 (string-dispatch (simple-base-string
1112 (simple-array character (*))
1115 (let ((len (fd-stream-obuf-length stream))
1116 (sap (fd-stream-obuf-sap stream))
1117 (tail (fd-stream-obuf-tail stream)))
1118 (declare (type index tail)
1119 ;; STRING bounds have already been checked.
1120 (optimize (safety 0)))
1122 (,@(if output-restart
1123 `(catch 'output-nothing)
1126 ((or (= start end) (< (- len tail) 4)))
1127 (let* ((byte (aref string start))
1128 (bits (char-code byte)))
1132 ;; Exited from the loop normally
1134 ;; Exited via CATCH. Skip the current character
1135 ;; and try the inner loop again.
1138 (flush-output-buffer stream)))
1140 (flush-output-buffer stream))))
1141 (def-output-routines (,format
1147 (if (char= byte #\Newline)
1148 (setf (fd-stream-char-pos stream) 0)
1149 (incf (fd-stream-char-pos stream)))
1150 (let ((bits (char-code byte))
1151 (sap (fd-stream-obuf-sap stream))
1152 (tail (fd-stream-obuf-tail stream)))
1154 (defun ,in-function (stream buffer start requested eof-error-p
1155 &aux (index start) (end (+ start requested)))
1156 (declare (type fd-stream stream)
1157 (type index start requested index end)
1159 (simple-array character (#.+ansi-stream-in-buffer-length+))
1161 (let ((unread (fd-stream-unread stream)))
1163 (setf (aref buffer index) unread)
1164 (setf (fd-stream-unread stream) nil)
1165 (setf (fd-stream-listen stream) nil)
1169 (let* ((head (fd-stream-ibuf-head stream))
1170 (tail (fd-stream-ibuf-tail stream))
1171 (sap (fd-stream-ibuf-sap stream)))
1172 (declare (type index head tail)
1173 (type system-area-pointer sap))
1174 ;; Copy data from stream buffer into user's buffer.
1175 (dotimes (i (min (truncate (- tail head) ,size)
1177 (declare (optimize speed))
1178 (let* ((byte (sap-ref-8 sap head)))
1179 (setf (aref buffer index) ,in-expr)
1182 (setf (fd-stream-ibuf-head stream) head)
1183 ;; Maybe we need to refill the stream buffer.
1184 (cond ( ;; If there was enough data in the stream buffer, we're done.
1186 (return (- index start)))
1187 ( ;; If EOF, we're done in another way.
1188 (null (catch 'eof-input-catcher (refill-buffer/fd stream)))
1190 (error 'end-of-file :stream stream)
1191 (return (- index start))))
1192 ;; Otherwise we refilled the stream buffer, so fall
1193 ;; through into another pass of the loop.
1195 (def-input-routine ,in-char-function (character ,size sap head)
1196 (let ((byte (sap-ref-8 sap head)))
1198 (defun ,read-c-string-function (sap element-type)
1199 (declare (type system-area-pointer sap)
1200 (type (member character base-char) element-type))
1202 (declare (optimize (speed 3) (safety 0)))
1203 (let* ((stream ,name)
1205 (loop for head of-type index upfrom 0 by ,size
1206 for count of-type index upto (1- array-dimension-limit)
1207 for byte = (sap-ref-8 sap head)
1208 for char of-type character = ,in-expr
1209 until (zerop (char-code char))
1210 finally (return count)))
1211 ;; Inline the common cases
1212 (string (make-string length :element-type element-type)))
1213 (declare (ignorable stream)
1215 (type simple-string string))
1216 (/show0 before-copy-loop)
1217 (loop for head of-type index upfrom 0 by ,size
1218 for index of-type index below length
1219 for byte = (sap-ref-8 sap head)
1220 for char of-type character = ,in-expr
1221 do (setf (aref string index) char))
1222 string))) ;; last loop rewrite to dotimes?
1223 (defun ,output-c-string-function (string)
1224 (declare (type simple-string string))
1226 (declare (optimize (speed 3) (safety 0)))
1227 (let* ((length (length string))
1228 (,n-buffer (make-array (* (1+ length) ,size)
1229 :element-type '(unsigned-byte 8)))
1230 ;; This SAP-taking may seem unsafe without pinning,
1231 ;; but since the variable name is a gensym OUT-EXPR
1232 ;; cannot close over it even if it tried, so the buffer
1233 ;; will always be either in a register or on stack.
1234 ;; FIXME: But ...this is true on x86oids only!
1235 (sap (vector-sap ,n-buffer))
1238 (declare (type index length tail)
1239 (type system-area-pointer sap))
1241 (let* ((byte (aref string i))
1242 (bits (char-code byte)))
1243 (declare (ignorable byte bits))
1247 (byte (code-char bits)))
1248 (declare (ignorable bits byte))
1251 (setf *external-formats*
1252 (cons '(,external-format ,in-function ,in-char-function ,out-function
1253 ,@(mapcar #'(lambda (buffering)
1254 (intern (format nil format (string buffering))))
1255 '(:none :line :full))
1256 nil ; no resync-function
1257 ,size-function ,read-c-string-function ,output-c-string-function)
1258 *external-formats*)))))
1260 (defmacro define-external-format/variable-width
1261 (external-format output-restart out-size-expr
1262 out-expr in-size-expr in-expr)
1263 (let* ((name (first external-format))
1264 (out-function (symbolicate "OUTPUT-BYTES/" name))
1265 (format (format nil "OUTPUT-CHAR-~A-~~A-BUFFERED" (string name)))
1266 (in-function (symbolicate "FD-STREAM-READ-N-CHARACTERS/" name))
1267 (in-char-function (symbolicate "INPUT-CHAR/" name))
1268 (resync-function (symbolicate "RESYNC/" name))
1269 (size-function (symbolicate "BYTES-FOR-CHAR/" name))
1270 (read-c-string-function (symbolicate "READ-FROM-C-STRING/" name))
1271 (output-c-string-function (symbolicate "OUTPUT-TO-C-STRING/" name))
1272 (n-buffer (gensym "BUFFER")))
1274 (defun ,size-function (byte)
1275 (declare (ignorable byte))
1277 (defun ,out-function (stream string flush-p start end)
1278 (let ((start (or start 0))
1279 (end (or end (length string))))
1280 (declare (type index start end))
1281 (when (and (not (fd-stream-dual-channel-p stream))
1282 (> (fd-stream-ibuf-tail stream)
1283 (fd-stream-ibuf-head stream)))
1284 (file-position stream (file-position stream)))
1285 (unless (<= 0 start end (length string))
1286 (signal-bounding-indices-bad-error string start end))
1289 (setf (fd-stream-obuf-tail stream)
1290 (string-dispatch (simple-base-string
1292 (simple-array character (*))
1295 (let ((len (fd-stream-obuf-length stream))
1296 (sap (fd-stream-obuf-sap stream))
1297 (tail (fd-stream-obuf-tail stream)))
1298 (declare (type index tail)
1299 ;; STRING bounds have already been checked.
1300 (optimize (safety 0)))
1302 (,@(if output-restart
1303 `(catch 'output-nothing)
1306 ((or (= start end) (< (- len tail) 4)))
1307 (let* ((byte (aref string start))
1308 (bits (char-code byte))
1309 (size ,out-size-expr))
1313 ;; Exited from the loop normally
1315 ;; Exited via CATCH. Skip the current character
1316 ;; and try the inner loop again.
1319 (flush-output-buffer stream)))
1321 (flush-output-buffer stream))))
1322 (def-output-routines/variable-width (,format
1329 (if (char= byte #\Newline)
1330 (setf (fd-stream-char-pos stream) 0)
1331 (incf (fd-stream-char-pos stream)))
1332 (let ((bits (char-code byte))
1333 (sap (fd-stream-obuf-sap stream))
1334 (tail (fd-stream-obuf-tail stream)))
1336 (defun ,in-function (stream buffer start requested eof-error-p
1337 &aux (total-copied 0))
1338 (declare (type fd-stream stream)
1339 (type index start requested total-copied)
1341 (simple-array character (#.+ansi-stream-in-buffer-length+))
1343 (let ((unread (fd-stream-unread stream)))
1345 (setf (aref buffer start) unread)
1346 (setf (fd-stream-unread stream) nil)
1347 (setf (fd-stream-listen stream) nil)
1348 (incf total-copied)))
1351 (let* ((head (fd-stream-ibuf-head stream))
1352 (tail (fd-stream-ibuf-tail stream))
1353 (sap (fd-stream-ibuf-sap stream))
1354 (decode-break-reason nil))
1355 (declare (type index head tail))
1356 ;; Copy data from stream buffer into user's buffer.
1357 (do ((size nil nil))
1358 ((or (= tail head) (= requested total-copied)))
1359 (setf decode-break-reason
1360 (block decode-break-reason
1361 (let ((byte (sap-ref-8 sap head)))
1362 (declare (ignorable byte))
1363 (setq size ,in-size-expr)
1364 (when (> size (- tail head))
1366 (setf (aref buffer (+ start total-copied)) ,in-expr)
1370 (setf (fd-stream-ibuf-head stream) head)
1371 (when decode-break-reason
1372 ;; If we've already read some characters on when the invalid
1373 ;; code sequence is detected, we return immediately. The
1374 ;; handling of the error is deferred until the next call
1375 ;; (where this check will be false). This allows establishing
1376 ;; high-level handlers for decode errors (for example
1377 ;; automatically resyncing in Lisp comments).
1378 (when (plusp total-copied)
1379 (return-from ,in-function total-copied))
1380 (when (stream-decoding-error-and-handle
1381 stream decode-break-reason)
1383 (error 'end-of-file :stream stream)
1384 (return-from ,in-function total-copied)))
1385 (setf head (fd-stream-ibuf-head stream))
1386 (setf tail (fd-stream-ibuf-tail stream))))
1387 (setf (fd-stream-ibuf-head stream) head)
1388 ;; Maybe we need to refill the stream buffer.
1389 (cond ( ;; If there were enough data in the stream buffer, we're done.
1390 (= total-copied requested)
1391 (return total-copied))
1392 ( ;; If EOF, we're done in another way.
1393 (or (eq decode-break-reason 'eof)
1394 (null (catch 'eof-input-catcher
1395 (refill-buffer/fd stream))))
1397 (error 'end-of-file :stream stream)
1398 (return total-copied)))
1399 ;; Otherwise we refilled the stream buffer, so fall
1400 ;; through into another pass of the loop.
1402 (def-input-routine/variable-width ,in-char-function (character
1406 (let ((byte (sap-ref-8 sap head)))
1407 (declare (ignorable byte))
1409 (defun ,resync-function (stream)
1410 (loop (input-at-least stream 2)
1411 (incf (fd-stream-ibuf-head stream))
1412 (unless (block decode-break-reason
1413 (let* ((sap (fd-stream-ibuf-sap stream))
1414 (head (fd-stream-ibuf-head stream))
1415 (byte (sap-ref-8 sap head))
1416 (size ,in-size-expr))
1417 (declare (ignorable byte))
1418 (input-at-least stream size)
1419 (let ((sap (fd-stream-ibuf-sap stream))
1420 (head (fd-stream-ibuf-head stream)))
1424 (defun ,read-c-string-function (sap element-type)
1425 (declare (type system-area-pointer sap))
1427 (declare (optimize (speed 3) (safety 0)))
1428 (let* ((stream ,name)
1429 (size 0) (head 0) (byte 0) (char nil)
1430 (decode-break-reason nil)
1431 (length (dotimes (count (1- ARRAY-DIMENSION-LIMIT) count)
1432 (setf decode-break-reason
1433 (block decode-break-reason
1434 (setf byte (sap-ref-8 sap head)
1439 (when decode-break-reason
1440 (c-string-decoding-error ,name decode-break-reason))
1441 (when (zerop (char-code char))
1443 (string (make-string length :element-type element-type)))
1444 (declare (ignorable stream)
1445 (type index head length) ;; size
1446 (type (unsigned-byte 8) byte)
1447 (type (or null character) char)
1448 (type string string))
1450 (dotimes (index length string)
1451 (setf decode-break-reason
1452 (block decode-break-reason
1453 (setf byte (sap-ref-8 sap head)
1458 (when decode-break-reason
1459 (c-string-decoding-error ,name decode-break-reason))
1460 (setf (aref string index) char)))))
1462 (defun ,output-c-string-function (string)
1463 (declare (type simple-string string))
1465 (declare (optimize (speed 3) (safety 0)))
1466 (let* ((length (length string))
1467 (char-length (make-array (1+ length) :element-type 'index))
1469 (+ (loop for i of-type index below length
1470 for byte of-type character = (aref string i)
1471 for bits = (char-code byte)
1472 sum (setf (aref char-length i)
1473 (the index ,out-size-expr)))
1474 (let* ((byte (code-char 0))
1475 (bits (char-code byte)))
1476 (declare (ignorable byte bits))
1477 (setf (aref char-length length)
1478 (the index ,out-size-expr)))))
1480 (,n-buffer (make-array buffer-length
1481 :element-type '(unsigned-byte 8)))
1482 ;; This SAP-taking may seem unsafe without pinning,
1483 ;; but since the variable name is a gensym OUT-EXPR
1484 ;; cannot close over it even if it tried, so the buffer
1485 ;; will always be either in a register or on stack.
1486 ;; FIXME: But ...this is true on x86oids only!
1487 (sap (vector-sap ,n-buffer))
1489 (declare (type index length buffer-length tail)
1490 (type system-area-pointer sap)
1493 (loop for i of-type index below length
1494 for byte of-type character = (aref string i)
1495 for bits = (char-code byte)
1496 for size of-type index = (aref char-length i)
1501 (byte (code-char bits))
1502 (size (aref char-length length)))
1503 (declare (ignorable bits byte size))
1507 (setf *external-formats*
1508 (cons '(,external-format ,in-function ,in-char-function ,out-function
1509 ,@(mapcar #'(lambda (buffering)
1510 (intern (format nil format (string buffering))))
1511 '(:none :line :full))
1513 ,size-function ,read-c-string-function ,output-c-string-function)
1514 *external-formats*)))))
1516 ;;; Multiple names for the :ISO{,-}8859-* families are needed because on
1517 ;;; FreeBSD (and maybe other BSD systems), nl_langinfo("LATIN-1") will
1518 ;;; return "ISO8859-1" instead of "ISO-8859-1".
1519 (define-external-format (:latin-1 :latin1 :iso-8859-1 :iso8859-1)
1522 (external-format-encoding-error stream bits)
1523 (setf (sap-ref-8 sap tail) bits))
1526 (define-external-format (:ascii :us-ascii :ansi_x3.4-1968
1527 :iso-646 :iso-646-us :|646|)
1530 (external-format-encoding-error stream bits)
1531 (setf (sap-ref-8 sap tail) bits))
1534 (let* ((table (let ((s (make-string 256)))
1535 (map-into s #'code-char
1536 '(#x00 #x01 #x02 #x03 #x9c #x09 #x86 #x7f #x97 #x8d #x8e #x0b #x0c #x0d #x0e #x0f
1537 #x10 #x11 #x12 #x13 #x9d #x85 #x08 #x87 #x18 #x19 #x92 #x8f #x1c #x1d #x1e #x1f
1538 #x80 #x81 #x82 #x83 #x84 #x0a #x17 #x1b #x88 #x89 #x8a #x8b #x8c #x05 #x06 #x07
1539 #x90 #x91 #x16 #x93 #x94 #x95 #x96 #x04 #x98 #x99 #x9a #x9b #x14 #x15 #x9e #x1a
1540 #x20 #xa0 #xe2 #xe4 #xe0 #xe1 #xe3 #xe5 #xe7 #xf1 #xa2 #x2e #x3c #x28 #x2b #x7c
1541 #x26 #xe9 #xea #xeb #xe8 #xed #xee #xef #xec #xdf #x21 #x24 #x2a #x29 #x3b #xac
1542 #x2d #x2f #xc2 #xc4 #xc0 #xc1 #xc3 #xc5 #xc7 #xd1 #xa6 #x2c #x25 #x5f #x3e #x3f
1543 #xf8 #xc9 #xca #xcb #xc8 #xcd #xce #xcf #xcc #x60 #x3a #x23 #x40 #x27 #x3d #x22
1544 #xd8 #x61 #x62 #x63 #x64 #x65 #x66 #x67 #x68 #x69 #xab #xbb #xf0 #xfd #xfe #xb1
1545 #xb0 #x6a #x6b #x6c #x6d #x6e #x6f #x70 #x71 #x72 #xaa #xba #xe6 #xb8 #xc6 #xa4
1546 #xb5 #x7e #x73 #x74 #x75 #x76 #x77 #x78 #x79 #x7a #xa1 #xbf #xd0 #xdd #xde #xae
1547 #x5e #xa3 #xa5 #xb7 #xa9 #xa7 #xb6 #xbc #xbd #xbe #x5b #x5d #xaf #xa8 #xb4 #xd7
1548 #x7b #x41 #x42 #x43 #x44 #x45 #x46 #x47 #x48 #x49 #xad #xf4 #xf6 #xf2 #xf3 #xf5
1549 #x7d #x4a #x4b #x4c #x4d #x4e #x4f #x50 #x51 #x52 #xb9 #xfb #xfc #xf9 #xfa #xff
1550 #x5c #xf7 #x53 #x54 #x55 #x56 #x57 #x58 #x59 #x5a #xb2 #xd4 #xd6 #xd2 #xd3 #xd5
1551 #x30 #x31 #x32 #x33 #x34 #x35 #x36 #x37 #x38 #x39 #xb3 #xdb #xdc #xd9 #xda #x9f))
1553 (reverse-table (let ((rt (make-array 256 :element-type '(unsigned-byte 8) :initial-element 0)))
1554 (loop for char across table for i from 0
1555 do (aver (= 0 (aref rt (char-code char))))
1556 do (setf (aref rt (char-code char)) i))
1558 (define-external-format (:ebcdic-us :ibm-037 :ibm037)
1561 (external-format-encoding-error stream bits)
1562 (setf (sap-ref-8 sap tail) (aref reverse-table bits)))
1567 (let ((latin-9-table (let ((table (make-string 256)))
1570 (setf (aref table i) (code-char i)))
1571 (setf (aref table #xa4) (code-char #x20ac))
1572 (setf (aref table #xa6) (code-char #x0160))
1573 (setf (aref table #xa8) (code-char #x0161))
1574 (setf (aref table #xb4) (code-char #x017d))
1575 (setf (aref table #xb8) (code-char #x017e))
1576 (setf (aref table #xbc) (code-char #x0152))
1577 (setf (aref table #xbd) (code-char #x0153))
1578 (setf (aref table #xbe) (code-char #x0178))
1580 (latin-9-reverse-1 (make-array 16
1581 :element-type '(unsigned-byte 21)
1582 :initial-contents '(#x0160 #x0161 #x0152 #x0153 0 0 0 0 #x0178 0 0 0 #x20ac #x017d #x017e 0)))
1583 (latin-9-reverse-2 (make-array 16
1584 :element-type '(unsigned-byte 8)
1585 :initial-contents '(#xa6 #xa8 #xbc #xbd 0 0 0 0 #xbe 0 0 0 #xa4 #xb4 #xb8 0))))
1586 (define-external-format (:latin-9 :latin9 :iso-8859-15 :iso8859-15)
1588 (setf (sap-ref-8 sap tail)
1590 (if (= bits (char-code (aref latin-9-table bits)))
1592 (external-format-encoding-error stream byte))
1593 (if (= (aref latin-9-reverse-1 (logand bits 15)) bits)
1594 (aref latin-9-reverse-2 (logand bits 15))
1595 (external-format-encoding-error stream byte))))
1596 (aref latin-9-table byte)))
1598 (define-external-format/variable-width (:utf-8 :utf8) nil
1599 (let ((bits (char-code byte)))
1600 (cond ((< bits #x80) 1)
1602 ((< bits #x10000) 3)
1605 (1 (setf (sap-ref-8 sap tail) bits))
1606 (2 (setf (sap-ref-8 sap tail) (logior #xc0 (ldb (byte 5 6) bits))
1607 (sap-ref-8 sap (1+ tail)) (logior #x80 (ldb (byte 6 0) bits))))
1608 (3 (setf (sap-ref-8 sap tail) (logior #xe0 (ldb (byte 4 12) bits))
1609 (sap-ref-8 sap (1+ tail)) (logior #x80 (ldb (byte 6 6) bits))
1610 (sap-ref-8 sap (+ 2 tail)) (logior #x80 (ldb (byte 6 0) bits))))
1611 (4 (setf (sap-ref-8 sap tail) (logior #xf0 (ldb (byte 3 18) bits))
1612 (sap-ref-8 sap (1+ tail)) (logior #x80 (ldb (byte 6 12) bits))
1613 (sap-ref-8 sap (+ 2 tail)) (logior #x80 (ldb (byte 6 6) bits))
1614 (sap-ref-8 sap (+ 3 tail)) (logior #x80 (ldb (byte 6 0) bits)))))
1615 (cond ((< byte #x80) 1)
1616 ((< byte #xc2) (return-from decode-break-reason 1))
1620 (code-char (ecase size
1622 (2 (let ((byte2 (sap-ref-8 sap (1+ head))))
1623 (unless (<= #x80 byte2 #xbf)
1624 (return-from decode-break-reason 2))
1625 (dpb byte (byte 5 6) byte2)))
1626 (3 (let ((byte2 (sap-ref-8 sap (1+ head)))
1627 (byte3 (sap-ref-8 sap (+ 2 head))))
1628 (unless (and (<= #x80 byte2 #xbf)
1629 (<= #x80 byte3 #xbf))
1630 (return-from decode-break-reason 3))
1631 (dpb byte (byte 4 12) (dpb byte2 (byte 6 6) byte3))))
1632 (4 (let ((byte2 (sap-ref-8 sap (1+ head)))
1633 (byte3 (sap-ref-8 sap (+ 2 head)))
1634 (byte4 (sap-ref-8 sap (+ 3 head))))
1635 (unless (and (<= #x80 byte2 #xbf)
1636 (<= #x80 byte3 #xbf)
1637 (<= #x80 byte4 #xbf))
1638 (return-from decode-break-reason 4))
1639 (dpb byte (byte 3 18)
1640 (dpb byte2 (byte 6 12)
1641 (dpb byte3 (byte 6 6) byte4))))))))
1643 ;;;; utility functions (misc routines, etc)
1645 ;;; Fill in the various routine slots for the given type. INPUT-P and
1646 ;;; OUTPUT-P indicate what slots to fill. The buffering slot must be
1647 ;;; set prior to calling this routine.
1648 (defun set-fd-stream-routines (fd-stream element-type external-format
1649 input-p output-p buffer-p)
1650 (let* ((target-type (case element-type
1651 (unsigned-byte '(unsigned-byte 8))
1652 (signed-byte '(signed-byte 8))
1653 (:default 'character)
1655 (character-stream-p (subtypep target-type 'character))
1656 (bivalent-stream-p (eq element-type :default))
1657 normalized-external-format
1658 (bin-routine #'ill-bin)
1661 (cin-routine #'ill-in)
1664 (input-type nil) ;calculated from bin-type/cin-type
1665 (input-size nil) ;calculated from bin-size/cin-size
1666 (read-n-characters #'ill-in)
1667 (bout-routine #'ill-bout)
1670 (cout-routine #'ill-out)
1675 (output-bytes #'ill-bout))
1677 ;; drop buffers when direction changes
1678 (when (and (fd-stream-obuf-sap fd-stream) (not output-p))
1679 (with-available-buffers-lock ()
1680 (push (fd-stream-obuf-sap fd-stream) *available-buffers*)
1681 (setf (fd-stream-obuf-sap fd-stream) nil)))
1682 (when (and (fd-stream-ibuf-sap fd-stream) (not input-p))
1683 (with-available-buffers-lock ()
1684 (push (fd-stream-ibuf-sap fd-stream) *available-buffers*)
1685 (setf (fd-stream-ibuf-sap fd-stream) nil)))
1687 (setf (fd-stream-ibuf-sap fd-stream) (next-available-buffer))
1688 (setf (fd-stream-ibuf-length fd-stream) bytes-per-buffer)
1689 (setf (fd-stream-ibuf-tail fd-stream) 0))
1691 (setf (fd-stream-obuf-sap fd-stream) (next-available-buffer))
1692 (setf (fd-stream-obuf-length fd-stream) bytes-per-buffer)
1693 (setf (fd-stream-obuf-tail fd-stream) 0)
1694 (setf (fd-stream-char-pos fd-stream) 0))
1696 (when (and character-stream-p
1697 (eq external-format :default))
1698 (/show0 "/getting default external format")
1699 (setf external-format (default-external-format)))
1702 (when (or (not character-stream-p) bivalent-stream-p)
1703 (multiple-value-setq (bin-routine bin-type bin-size read-n-characters
1704 normalized-external-format)
1705 (pick-input-routine (if bivalent-stream-p '(unsigned-byte 8)
1709 (error "could not find any input routine for ~S" target-type)))
1710 (when character-stream-p
1711 (multiple-value-setq (cin-routine cin-type cin-size read-n-characters
1712 normalized-external-format)
1713 (pick-input-routine target-type external-format))
1715 (error "could not find any input routine for ~S" target-type)))
1716 (setf (fd-stream-in fd-stream) cin-routine
1717 (fd-stream-bin fd-stream) bin-routine)
1718 ;; character type gets preferential treatment
1719 (setf input-size (or cin-size bin-size))
1720 (setf input-type (or cin-type bin-type))
1721 (when normalized-external-format
1722 (setf (fd-stream-external-format fd-stream)
1723 normalized-external-format))
1724 (when (= (or cin-size 1) (or bin-size 1) 1)
1725 (setf (fd-stream-n-bin fd-stream) ;XXX
1726 (if (and character-stream-p (not bivalent-stream-p))
1728 #'fd-stream-read-n-bytes))
1729 ;; Sometimes turn on fast-read-char/fast-read-byte. Switch on
1730 ;; for character and (unsigned-byte 8) streams. In these
1731 ;; cases, fast-read-* will read from the
1732 ;; ansi-stream-(c)in-buffer, saving function calls.
1733 ;; Otherwise, the various data-reading functions in the stream
1734 ;; structure will be called.
1736 (not bivalent-stream-p)
1737 ;; temporary disable on :io streams
1739 (cond (character-stream-p
1740 (setf (ansi-stream-cin-buffer fd-stream)
1741 (make-array +ansi-stream-in-buffer-length+
1742 :element-type 'character)))
1743 ((equal target-type '(unsigned-byte 8))
1744 (setf (ansi-stream-in-buffer fd-stream)
1745 (make-array +ansi-stream-in-buffer-length+
1746 :element-type '(unsigned-byte 8))))))))
1749 (when (or (not character-stream-p) bivalent-stream-p)
1750 (multiple-value-setq (bout-routine bout-type bout-size output-bytes
1751 normalized-external-format)
1752 (pick-output-routine (if bivalent-stream-p
1755 (fd-stream-buffering fd-stream)
1757 (unless bout-routine
1758 (error "could not find any output routine for ~S buffered ~S"
1759 (fd-stream-buffering fd-stream)
1761 (when character-stream-p
1762 (multiple-value-setq (cout-routine cout-type cout-size output-bytes
1763 normalized-external-format)
1764 (pick-output-routine target-type
1765 (fd-stream-buffering fd-stream)
1767 (unless cout-routine
1768 (error "could not find any output routine for ~S buffered ~S"
1769 (fd-stream-buffering fd-stream)
1771 (when normalized-external-format
1772 (setf (fd-stream-external-format fd-stream)
1773 normalized-external-format))
1774 (when character-stream-p
1775 (setf (fd-stream-output-bytes fd-stream) output-bytes))
1776 (setf (fd-stream-out fd-stream) cout-routine
1777 (fd-stream-bout fd-stream) bout-routine
1778 (fd-stream-sout fd-stream) (if (eql cout-size 1)
1779 #'fd-sout #'ill-out))
1780 (setf output-size (or cout-size bout-size))
1781 (setf output-type (or cout-type bout-type)))
1783 (when (and input-size output-size
1784 (not (eq input-size output-size)))
1785 (error "Element sizes for input (~S:~S) and output (~S:~S) differ?"
1786 input-type input-size
1787 output-type output-size))
1788 (setf (fd-stream-element-size fd-stream)
1789 (or input-size output-size))
1791 (setf (fd-stream-element-type fd-stream)
1792 (cond ((equal input-type output-type)
1798 ((subtypep input-type output-type)
1800 ((subtypep output-type input-type)
1803 (error "Input type (~S) and output type (~S) are unrelated?"
1807 ;;; Handle miscellaneous operations on FD-STREAM.
1808 (defun fd-stream-misc-routine (fd-stream operation &optional arg1 arg2)
1809 (declare (ignore arg2))
1812 (labels ((do-listen ()
1813 (or (not (eql (fd-stream-ibuf-head fd-stream)
1814 (fd-stream-ibuf-tail fd-stream)))
1815 (fd-stream-listen fd-stream)
1817 (sb!win32:fd-listen (fd-stream-fd fd-stream))
1819 ;; If the read can block, LISTEN will certainly return NIL.
1820 (if (sysread-may-block-p fd-stream)
1822 ;; Otherwise select(2) and CL:LISTEN have slightly
1823 ;; different semantics. The former returns that an FD
1824 ;; is readable when a read operation wouldn't block.
1825 ;; That includes EOF. However, LISTEN must return NIL
1827 (progn (catch 'eof-input-catcher
1828 ;; r-b/f too calls select, but it shouldn't
1829 ;; block as long as read can return once w/o
1831 (refill-buffer/fd fd-stream))
1832 ;; At this point either IBUF-HEAD != IBUF-TAIL
1833 ;; and FD-STREAM-LISTEN is NIL, in which case
1834 ;; we should return T, or IBUF-HEAD ==
1835 ;; IBUF-TAIL and FD-STREAM-LISTEN is :EOF, in
1836 ;; which case we should return :EOF for this
1837 ;; call and all future LISTEN call on this stream.
1838 ;; Call ourselves again to determine which case
1843 (setf (fd-stream-unread fd-stream) arg1)
1844 (setf (fd-stream-listen fd-stream) t))
1846 (cond (arg1 ; We got us an abort on our hands.
1847 (when (fd-stream-handler fd-stream)
1848 (remove-fd-handler (fd-stream-handler fd-stream))
1849 (setf (fd-stream-handler fd-stream) nil))
1850 ;; We can't do anything unless we know what file were
1851 ;; dealing with, and we don't want to do anything
1852 ;; strange unless we were writing to the file.
1853 (when (and (fd-stream-file fd-stream)
1854 (fd-stream-obuf-sap fd-stream))
1855 (if (fd-stream-original fd-stream)
1856 ;; If the original is EQ to file we are appending
1857 ;; and can just close the file without renaming.
1858 (unless (eq (fd-stream-original fd-stream)
1859 (fd-stream-file fd-stream))
1860 ;; We have a handle on the original, just revert.
1861 (multiple-value-bind (okay err)
1862 (sb!unix:unix-rename (fd-stream-original fd-stream)
1863 (fd-stream-file fd-stream))
1865 (simple-stream-perror
1866 "couldn't restore ~S to its original contents"
1869 ;; We can't restore the original, and aren't
1870 ;; appending, so nuke that puppy.
1872 ;; FIXME: This is currently the fate of superseded
1873 ;; files, and according to the CLOSE spec this is
1874 ;; wrong. However, there seems to be no clean way to
1875 ;; do that that doesn't involve either copying the
1876 ;; data (bad if the :abort resulted from a full
1877 ;; disk), or renaming the old file temporarily
1878 ;; (probably bad because stream opening becomes more
1880 (multiple-value-bind (okay err)
1881 (sb!unix:unix-unlink (fd-stream-file fd-stream))
1883 (error 'simple-file-error
1884 :pathname (fd-stream-file fd-stream)
1886 "~@<couldn't remove ~S: ~2I~_~A~:>"
1887 :format-arguments (list (fd-stream-file fd-stream)
1888 (strerror err))))))))
1890 (fd-stream-misc-routine fd-stream :finish-output)
1891 (when (and (fd-stream-original fd-stream)
1892 (fd-stream-delete-original fd-stream))
1893 (multiple-value-bind (okay err)
1894 (sb!unix:unix-unlink (fd-stream-original fd-stream))
1896 (error 'simple-file-error
1897 :pathname (fd-stream-original fd-stream)
1899 "~@<couldn't delete ~S during close of ~S: ~
1902 (list (fd-stream-original fd-stream)
1904 (strerror err))))))))
1905 (when (fboundp 'cancel-finalization)
1906 (cancel-finalization fd-stream))
1907 (sb!unix:unix-close (fd-stream-fd fd-stream))
1908 (when (fd-stream-obuf-sap fd-stream)
1909 (with-available-buffers-lock ()
1910 (push (fd-stream-obuf-sap fd-stream) *available-buffers*)
1911 (setf (fd-stream-obuf-sap fd-stream) nil)))
1912 (when (fd-stream-ibuf-sap fd-stream)
1913 (with-available-buffers-lock ()
1914 (push (fd-stream-ibuf-sap fd-stream) *available-buffers*)
1915 (setf (fd-stream-ibuf-sap fd-stream) nil)))
1916 (sb!impl::set-closed-flame fd-stream))
1918 (setf (fd-stream-unread fd-stream) nil)
1919 (setf (fd-stream-ibuf-head fd-stream) 0)
1920 (setf (fd-stream-ibuf-tail fd-stream) 0)
1923 (sb!win32:fd-clear-input (fd-stream-fd fd-stream))
1924 (setf (fd-stream-listen fd-stream) nil))
1926 (catch 'eof-input-catcher
1927 (loop until (sysread-may-block-p fd-stream)
1929 (refill-buffer/fd fd-stream)
1930 (setf (fd-stream-ibuf-head fd-stream) 0)
1931 (setf (fd-stream-ibuf-tail fd-stream) 0))
1934 (flush-output-buffer fd-stream))
1936 (finish-fd-stream-output fd-stream))
1938 (fd-stream-element-type fd-stream))
1940 (fd-stream-external-format fd-stream))
1942 (= 1 (the (member 0 1)
1943 (sb!unix:unix-isatty (fd-stream-fd fd-stream)))))
1947 (fd-stream-char-pos fd-stream))
1949 (unless (fd-stream-file fd-stream)
1950 ;; This is a TYPE-ERROR because ANSI's species FILE-LENGTH
1951 ;; "should signal an error of type TYPE-ERROR if stream is not
1952 ;; a stream associated with a file". Too bad there's no very
1953 ;; appropriate value for the EXPECTED-TYPE slot..
1954 (error 'simple-type-error
1956 :expected-type 'fd-stream
1957 :format-control "~S is not a stream associated with a file."
1958 :format-arguments (list fd-stream)))
1959 (multiple-value-bind (okay dev ino mode nlink uid gid rdev size
1960 atime mtime ctime blksize blocks)
1961 (sb!unix:unix-fstat (fd-stream-fd fd-stream))
1962 (declare (ignore ino nlink uid gid rdev
1963 atime mtime ctime blksize blocks))
1965 (simple-stream-perror "failed Unix fstat(2) on ~S" fd-stream dev))
1968 (truncate size (fd-stream-element-size fd-stream)))))
1969 (:file-string-length
1971 (character (fd-stream-character-size fd-stream arg1))
1972 (string (fd-stream-string-size fd-stream arg1))))
1975 (fd-stream-set-file-position fd-stream arg1)
1976 (fd-stream-get-file-position fd-stream)))))
1978 ;; FIXME: Think about this.
1980 ;; (defun finish-fd-stream-output (fd-stream)
1981 ;; (let ((timeout (fd-stream-timeout fd-stream)))
1982 ;; (loop while (fd-stream-output-later fd-stream)
1983 ;; ;; FIXME: SIGINT while waiting for a timeout will
1984 ;; ;; cause a timeout here.
1985 ;; do (when (and (not (serve-event timeout)) timeout)
1986 ;; (signal-timeout 'io-timeout
1987 ;; :stream fd-stream
1988 ;; :direction :write
1989 ;; :seconds timeout)))))
1991 (defun finish-fd-stream-output (stream)
1992 (flush-output-buffer stream)
1994 ((null (fd-stream-output-later stream)))
1995 (serve-all-events)))
1997 (defun fd-stream-get-file-position (stream)
1998 (declare (fd-stream stream))
2000 (let ((posn (sb!unix:unix-lseek (fd-stream-fd stream) 0 sb!unix:l_incr)))
2001 (declare (type (or (alien sb!unix:off-t) null) posn))
2002 ;; We used to return NIL for errno==ESPIPE, and signal an error
2003 ;; in other failure cases. However, CLHS says to return NIL if
2004 ;; the position cannot be determined -- so that's what we do.
2005 (when (integerp posn)
2006 ;; Adjust for buffered output: If there is any output
2007 ;; buffered, the *real* file position will be larger
2008 ;; than reported by lseek() because lseek() obviously
2009 ;; cannot take into account output we have not sent
2011 (dolist (later (fd-stream-output-later stream))
2012 (incf posn (- (caddr later) (cadr later))))
2013 (incf posn (fd-stream-obuf-tail stream))
2014 ;; Adjust for unread input: If there is any input
2015 ;; read from UNIX but not supplied to the user of the
2016 ;; stream, the *real* file position will smaller than
2017 ;; reported, because we want to look like the unread
2018 ;; stuff is still available.
2019 (decf posn (- (fd-stream-ibuf-tail stream)
2020 (fd-stream-ibuf-head stream)))
2021 (when (fd-stream-unread stream)
2023 ;; Divide bytes by element size.
2024 (truncate posn (fd-stream-element-size stream))))))
2026 (defun fd-stream-set-file-position (stream position-spec)
2027 (declare (fd-stream stream))
2028 (check-type position-spec
2029 (or (alien sb!unix:off-t) (member nil :start :end))
2030 "valid file position designator")
2033 ;; Make sure we don't have any output pending, because if we
2034 ;; move the file pointer before writing this stuff, it will be
2035 ;; written in the wrong location.
2036 (finish-fd-stream-output stream)
2037 ;; Disable interrupts so that interrupt handlers doing output
2040 (unless (fd-stream-output-finished-p stream)
2041 ;; We got interrupted and more output came our way during
2042 ;; the interrupt. Wrapping the FINISH-FD-STREAM-OUTPUT in
2043 ;; WITHOUT-INTERRUPTS gets nasty as it can signal errors,
2044 ;; so we prefer to do things like this...
2046 ;; Clear out any pending input to force the next read to go to
2048 (setf (fd-stream-unread stream) nil
2049 (fd-stream-ibuf-head stream) 0
2050 (fd-stream-ibuf-tail stream) 0)
2051 ;; Trash cached value for listen, so that we check next time.
2052 (setf (fd-stream-listen stream) nil)
2054 (multiple-value-bind (offset origin)
2057 (values 0 sb!unix:l_set))
2059 (values 0 sb!unix:l_xtnd))
2061 (values (* position-spec (fd-stream-element-size stream))
2063 (declare (type (alien sb!unix:off-t) offset))
2064 (let ((posn (sb!unix:unix-lseek (fd-stream-fd stream)
2066 ;; CLHS says to return true if the file-position was set
2067 ;; succesfully, and NIL otherwise. We are to signal an error
2068 ;; only if the given position was out of bounds, and that is
2069 ;; dealt with above. In times past we used to return NIL for
2070 ;; errno==ESPIPE, and signal an error in other cases.
2072 ;; FIXME: We are still liable to signal an error if flushing
2074 (return-from fd-stream-set-file-position
2075 (typep posn '(alien sb!unix:off-t))))))))
2078 ;;;; creation routines (MAKE-FD-STREAM and OPEN)
2080 ;;; Create a stream for the given Unix file descriptor.
2082 ;;; If INPUT is non-NIL, allow input operations. If OUTPUT is non-nil,
2083 ;;; allow output operations. If neither INPUT nor OUTPUT is specified,
2084 ;;; default to allowing input.
2086 ;;; ELEMENT-TYPE indicates the element type to use (as for OPEN).
2088 ;;; BUFFERING indicates the kind of buffering to use.
2090 ;;; TIMEOUT (if true) is the number of seconds to wait for input. If
2091 ;;; NIL (the default), then wait forever. When we time out, we signal
2094 ;;; FILE is the name of the file (will be returned by PATHNAME).
2096 ;;; NAME is used to identify the stream when printed.
2097 (defun make-fd-stream (fd
2100 (output nil output-p)
2101 (element-type 'base-char)
2103 (external-format :default)
2112 (format nil "file ~A" file)
2113 (format nil "descriptor ~W" fd)))
2115 (declare (type index fd) (type (or real null) timeout)
2116 (type (member :none :line :full) buffering))
2117 (cond ((not (or input-p output-p))
2119 ((not (or input output))
2120 (error "File descriptor must be opened either for input or output.")))
2121 (let ((stream (%make-fd-stream :fd fd
2125 :delete-original delete-original
2127 :buffering buffering
2128 :dual-channel-p dual-channel-p
2129 :external-format external-format
2132 (coerce timeout 'single-float)
2134 (set-fd-stream-routines stream element-type external-format
2135 input output input-buffer-p)
2136 (when (and auto-close (fboundp 'finalize))
2139 (sb!unix:unix-close fd)
2141 (format *terminal-io* "** closed file descriptor ~W **~%"
2145 ;;; Pick a name to use for the backup file for the :IF-EXISTS
2146 ;;; :RENAME-AND-DELETE and :RENAME options.
2147 (defun pick-backup-name (name)
2148 (declare (type simple-string name))
2149 (concatenate 'simple-string name ".bak"))
2151 ;;; Ensure that the given arg is one of the given list of valid
2152 ;;; things. Allow the user to fix any problems.
2153 (defun ensure-one-of (item list what)
2154 (unless (member item list)
2155 (error 'simple-type-error
2157 :expected-type `(member ,@list)
2158 :format-control "~@<~S is ~_invalid for ~S; ~_need one of~{ ~S~}~:>"
2159 :format-arguments (list item what list))))
2161 ;;; Rename NAMESTRING to ORIGINAL. First, check whether we have write
2162 ;;; access, since we don't want to trash unwritable files even if we
2163 ;;; technically can. We return true if we succeed in renaming.
2164 (defun rename-the-old-one (namestring original)
2165 (unless (sb!unix:unix-access namestring sb!unix:w_ok)
2166 (error "~@<The file ~2I~_~S ~I~_is not writable.~:>" namestring))
2167 (multiple-value-bind (okay err) (sb!unix:unix-rename namestring original)
2170 (error 'simple-file-error
2171 :pathname namestring
2173 "~@<couldn't rename ~2I~_~S ~I~_to ~2I~_~S: ~4I~_~A~:>"
2174 :format-arguments (list namestring original (strerror err))))))
2176 (defun open (filename
2179 (element-type 'base-char)
2180 (if-exists nil if-exists-given)
2181 (if-does-not-exist nil if-does-not-exist-given)
2182 (external-format :default)
2183 &aux ; Squelch assignment warning.
2184 (direction direction)
2185 (if-does-not-exist if-does-not-exist)
2186 (if-exists if-exists))
2188 "Return a stream which reads from or writes to FILENAME.
2190 :DIRECTION - one of :INPUT, :OUTPUT, :IO, or :PROBE
2191 :ELEMENT-TYPE - the type of object to read or write, default BASE-CHAR
2192 :IF-EXISTS - one of :ERROR, :NEW-VERSION, :RENAME, :RENAME-AND-DELETE,
2193 :OVERWRITE, :APPEND, :SUPERSEDE or NIL
2194 :IF-DOES-NOT-EXIST - one of :ERROR, :CREATE or NIL
2195 See the manual for details."
2197 ;; Calculate useful stuff.
2198 (multiple-value-bind (input output mask)
2200 (:input (values t nil sb!unix:o_rdonly))
2201 (:output (values nil t sb!unix:o_wronly))
2202 (:io (values t t sb!unix:o_rdwr))
2203 (:probe (values t nil sb!unix:o_rdonly)))
2204 (declare (type index mask))
2205 (let* ((pathname (merge-pathnames filename))
2207 (cond ((unix-namestring pathname input))
2208 ((and input (eq if-does-not-exist :create))
2209 (unix-namestring pathname nil))
2210 ((and (eq direction :io) (not if-does-not-exist-given))
2211 (unix-namestring pathname nil)))))
2212 ;; Process if-exists argument if we are doing any output.
2214 (unless if-exists-given
2216 (if (eq (pathname-version pathname) :newest)
2219 (ensure-one-of if-exists
2220 '(:error :new-version :rename
2221 :rename-and-delete :overwrite
2222 :append :supersede nil)
2225 ((:new-version :error nil)
2226 (setf mask (logior mask sb!unix:o_excl)))
2227 ((:rename :rename-and-delete)
2228 (setf mask (logior mask sb!unix:o_creat)))
2230 (setf mask (logior mask sb!unix:o_trunc)))
2232 (setf mask (logior mask sb!unix:o_append)))))
2234 (setf if-exists :ignore-this-arg)))
2236 (unless if-does-not-exist-given
2237 (setf if-does-not-exist
2238 (cond ((eq direction :input) :error)
2240 (member if-exists '(:overwrite :append)))
2242 ((eq direction :probe)
2246 (ensure-one-of if-does-not-exist
2247 '(:error :create nil)
2249 (if (eq if-does-not-exist :create)
2250 (setf mask (logior mask sb!unix:o_creat)))
2252 (let ((original (case if-exists
2253 ((:rename :rename-and-delete)
2254 (pick-backup-name namestring))
2255 ((:append :overwrite)
2256 ;; KLUDGE: Provent CLOSE from deleting
2257 ;; appending streams when called with :ABORT T
2259 (delete-original (eq if-exists :rename-and-delete))
2261 (when (and original (not (eq original namestring)))
2262 ;; We are doing a :RENAME or :RENAME-AND-DELETE. Determine
2263 ;; whether the file already exists, make sure the original
2264 ;; file is not a directory, and keep the mode.
2267 (multiple-value-bind (okay err/dev inode orig-mode)
2268 (sb!unix:unix-stat namestring)
2269 (declare (ignore inode)
2270 (type (or index null) orig-mode))
2273 (when (and output (= (logand orig-mode #o170000)
2275 (error 'simple-file-error
2276 :pathname namestring
2278 "can't open ~S for output: is a directory"
2279 :format-arguments (list namestring)))
2280 (setf mode (logand orig-mode #o777))
2282 ((eql err/dev sb!unix:enoent)
2285 (simple-file-perror "can't find ~S"
2289 (rename-the-old-one namestring original))
2291 (setf delete-original nil)
2292 ;; In order to use :SUPERSEDE instead, we have to make
2293 ;; sure SB!UNIX:O_CREAT corresponds to
2294 ;; IF-DOES-NOT-EXIST. SB!UNIX:O_CREAT was set before
2295 ;; because of IF-EXISTS being :RENAME.
2296 (unless (eq if-does-not-exist :create)
2298 (logior (logandc2 mask sb!unix:o_creat)
2300 (setf if-exists :supersede))))
2302 ;; Now we can try the actual Unix open(2).
2303 (multiple-value-bind (fd errno)
2305 (sb!unix:unix-open namestring mask mode)
2306 (values nil sb!unix:enoent))
2307 (labels ((open-error (format-control &rest format-arguments)
2308 (error 'simple-file-error
2310 :format-control format-control
2311 :format-arguments format-arguments))
2312 (vanilla-open-error ()
2313 (simple-file-perror "error opening ~S" pathname errno)))
2316 ((:input :output :io)
2320 :element-type element-type
2321 :external-format external-format
2324 :delete-original delete-original
2331 (%make-fd-stream :name namestring
2334 :element-type element-type)))
2337 ((eql errno sb!unix:enoent)
2338 (case if-does-not-exist
2339 (:error (vanilla-open-error))
2341 (open-error "~@<The path ~2I~_~S ~I~_does not exist.~:>"
2344 ((and (eql errno sb!unix:eexist) (null if-exists))
2347 (vanilla-open-error)))))))))
2351 ;;; the stream connected to the controlling terminal, or NIL if there is none
2354 ;;; the stream connected to the standard input (file descriptor 0)
2357 ;;; the stream connected to the standard output (file descriptor 1)
2360 ;;; the stream connected to the standard error output (file descriptor 2)
2363 ;;; This is called when the cold load is first started up, and may also
2364 ;;; be called in an attempt to recover from nested errors.
2365 (defun stream-cold-init-or-reset ()
2367 (setf *terminal-io* (make-synonym-stream '*tty*))
2368 (setf *standard-output* (make-synonym-stream '*stdout*))
2369 (setf *standard-input* (make-synonym-stream '*stdin*))
2370 (setf *error-output* (make-synonym-stream '*stderr*))
2371 (setf *query-io* (make-synonym-stream '*terminal-io*))
2372 (setf *debug-io* *query-io*)
2373 (setf *trace-output* *standard-output*)
2376 ;;; This is called whenever a saved core is restarted.
2377 (defun stream-reinit ()
2378 (setf *available-buffers* nil)
2379 (with-output-to-string (*error-output*)
2381 (make-fd-stream 0 :name "standard input" :input t :buffering :line
2382 #!+win32 :external-format #!+win32 (sb!win32::console-input-codepage)))
2384 (make-fd-stream 1 :name "standard output" :output t :buffering :line
2385 #!+win32 :external-format #!+win32 (sb!win32::console-output-codepage)))
2387 (make-fd-stream 2 :name "standard error" :output t :buffering :line
2388 #!+win32 :external-format #!+win32 (sb!win32::console-output-codepage)))
2389 (let* ((ttyname #.(coerce "/dev/tty" 'simple-base-string))
2390 (tty (sb!unix:unix-open ttyname sb!unix:o_rdwr #o666)))
2394 :name "the terminal"
2399 (setf *tty* (make-two-way-stream *stdin* *stdout*))))
2400 (princ (get-output-stream-string *error-output*) *stderr*))
2405 ;;; the Unix way to beep
2406 (defun beep (stream)
2407 (write-char (code-char bell-char-code) stream)
2408 (finish-output stream))
2410 ;;; This is kind of like FILE-POSITION, but is an internal hack used
2411 ;;; by the filesys stuff to get and set the file name.
2413 ;;; FIXME: misleading name, screwy interface
2414 (defun file-name (stream &optional new-name)
2415 (when (typep stream 'fd-stream)
2417 (setf (fd-stream-pathname stream) new-name)
2418 (setf (fd-stream-file stream)
2419 (unix-namestring new-name nil))
2422 (fd-stream-pathname stream)))))