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 (defconstant bytes-per-buffer (* 4 1024)
25 "Number of bytes per buffer.")
27 ;;; Return the next available buffer, creating one if necessary.
28 #!-sb-fluid (declaim (inline next-available-buffer))
29 (defun next-available-buffer ()
30 (if *available-buffers*
31 (pop *available-buffers*)
32 (allocate-system-memory bytes-per-buffer)))
34 ;;;; the FILE-STREAM structure
36 (defstruct (file-stream
37 (:constructor %make-fd-stream)
38 ;; KLUDGE: in an ideal world, maybe we'd rewrite
39 ;; everything to use FILE-STREAM rather than simply
40 ;; providing this hack for compatibility with the old
41 ;; code. However, CVS doesn't deal terribly well with
42 ;; file renaming, so for now we use this
43 ;; backward-compatibility feature.
44 (:conc-name fd-stream-)
45 (:predicate fd-stream-p)
47 (misc #'fd-stream-misc-routine))
50 ;; the name of this stream
52 ;; the file this stream is for
54 ;; the backup file namestring for the old file, for :IF-EXISTS
55 ;; :RENAME or :RENAME-AND-DELETE.
56 (original nil :type (or simple-string null))
57 (delete-original nil) ; for :if-exists :rename-and-delete
58 ;;; the number of bytes per element
59 (element-size 1 :type index)
60 ;; the type of element being transfered
61 (element-type 'base-char)
62 ;; the Unix file descriptor
64 ;; controls when the output buffer is flushed
65 (buffering :full :type (member :full :line :none))
66 ;; character position (if known)
67 (char-pos nil :type (or index null))
68 ;; T if input is waiting on FD. :EOF if we hit EOF.
69 (listen nil :type (member nil t :eof))
73 (ibuf-sap nil :type (or system-area-pointer null))
74 (ibuf-length nil :type (or index null))
75 (ibuf-head 0 :type index)
76 (ibuf-tail 0 :type index)
79 (obuf-sap nil :type (or system-area-pointer null))
80 (obuf-length nil :type (or index null))
81 (obuf-tail 0 :type index)
83 ;; output flushed, but not written due to non-blocking io?
86 ;; timeout specified for this stream, or NIL if none
87 (timeout nil :type (or index null))
88 ;; pathname of the file this stream is opened to (returned by PATHNAME)
89 (pathname nil :type (or pathname null)))
90 (def!method print-object ((fd-stream file-stream) stream)
91 (declare (type stream stream))
92 (print-unreadable-object (fd-stream stream :type t :identity t)
93 (format stream "for ~S" (fd-stream-name fd-stream))))
95 ;;;; output routines and related noise
97 (defvar *output-routines* ()
99 "List of all available output routines. Each element is a list of the
100 element-type output, the kind of buffering, the function name, and the number
101 of bytes per element.")
103 ;;; common idioms for reporting low-level stream and file problems
104 (defun simple-stream-perror (note-format stream errno)
105 (error 'simple-stream-error
107 :format-control "~@<~?: ~2I~_~A~:>"
108 :format-arguments (list note-format (list stream) (strerror errno))))
109 (defun simple-file-perror (note-format pathname errno)
110 (error 'simple-file-error
112 :format-control "~@<~?: ~2I~_~A~:>"
114 (list note-format (list pathname) (strerror errno))))
116 ;;; This is called by the server when we can write to the given file
117 ;;; descriptor. Attempt to write the data again. If it worked, remove
118 ;;; the data from the OUTPUT-LATER list. If it didn't work, something
120 (defun frob-output-later (stream)
121 (let* ((stuff (pop (fd-stream-output-later stream)))
125 (reuse-sap (cadddr stuff))
126 (length (- end start)))
127 (declare (type index start end length))
128 (multiple-value-bind (count errno)
129 (sb!unix:unix-write (fd-stream-fd stream)
134 (if (= errno sb!unix:ewouldblock)
135 (error "Write would have blocked, but SERVER told us to go.")
136 (simple-stream-perror "couldn't write to ~S" stream errno)))
137 ((eql count length) ; Hot damn, it worked.
139 (push base *available-buffers*)))
140 ((not (null count)) ; sorta worked..
142 (the index (+ start count))
144 (fd-stream-output-later stream))))))
145 (unless (fd-stream-output-later stream)
146 (sb!sys:remove-fd-handler (fd-stream-handler stream))
147 (setf (fd-stream-handler stream) nil)))
149 ;;; Arange to output the string when we can write on the file descriptor.
150 (defun output-later (stream base start end reuse-sap)
151 (cond ((null (fd-stream-output-later stream))
152 (setf (fd-stream-output-later stream)
153 (list (list base start end reuse-sap)))
154 (setf (fd-stream-handler stream)
155 (sb!sys:add-fd-handler (fd-stream-fd stream)
158 (declare (ignore fd))
159 (frob-output-later stream)))))
161 (nconc (fd-stream-output-later stream)
162 (list (list base start end reuse-sap)))))
164 (let ((new-buffer (next-available-buffer)))
165 (setf (fd-stream-obuf-sap stream) new-buffer)
166 (setf (fd-stream-obuf-length stream) bytes-per-buffer))))
168 ;;; Output the given noise. Check to see whether there are any pending
169 ;;; writes. If so, just queue this one. Otherwise, try to write it. If
170 ;;; this would block, queue it.
171 (defun frob-output (stream base start end reuse-sap)
172 (declare (type file-stream stream)
173 (type (or system-area-pointer (simple-array * (*))) base)
174 (type index start end))
175 (if (not (null (fd-stream-output-later stream))) ; something buffered.
177 (output-later stream base start end reuse-sap)
178 ;; ### check to see whether any of this noise can be output
180 (let ((length (- end start)))
181 (multiple-value-bind (count errno)
182 (sb!unix:unix-write (fd-stream-fd stream) base start length)
184 (if (= errno sb!unix:ewouldblock)
185 (output-later stream base start end reuse-sap)
186 (simple-stream-perror "couldn't write to ~S"
189 ((not (eql count length))
190 (output-later stream base (the index (+ start count))
193 ;;; Flush any data in the output buffer.
194 (defun flush-output-buffer (stream)
195 (let ((length (fd-stream-obuf-tail stream)))
197 (frob-output stream (fd-stream-obuf-sap stream) 0 length t)
198 (setf (fd-stream-obuf-tail stream) 0))))
200 (defmacro output-wrapper ((stream size buffering) &body body)
201 (let ((stream-var (gensym)))
202 `(let ((,stream-var ,stream))
203 ,(unless (eq (car buffering) :none)
204 `(when (< (fd-stream-obuf-length ,stream-var)
205 (+ (fd-stream-obuf-tail ,stream-var)
207 (flush-output-buffer ,stream-var)))
208 ,(unless (eq (car buffering) :none)
209 `(when (> (fd-stream-ibuf-tail ,stream-var)
210 (fd-stream-ibuf-head ,stream-var))
211 (file-position ,stream-var (file-position ,stream-var))))
214 (incf (fd-stream-obuf-tail ,stream-var) ,size)
215 ,(ecase (car buffering)
217 `(flush-output-buffer ,stream-var))
219 `(when (eq (char-code byte) (char-code #\Newline))
220 (flush-output-buffer ,stream-var)))
224 ;;; Define output routines that output numbers SIZE bytes long for the
225 ;;; given bufferings. Use BODY to do the actual output.
226 (defmacro def-output-routines ((name-fmt size &rest bufferings) &body body)
227 (declare (optimize (speed 1)))
232 (intern (let ((*print-case* :upcase))
233 (format nil name-fmt (car buffering))))))
235 (defun ,function (stream byte)
236 (output-wrapper (stream ,size ,buffering)
238 (setf *output-routines*
239 (nconc *output-routines*
246 (cdr buffering)))))))
249 (def-output-routines ("OUTPUT-CHAR-~A-BUFFERED"
254 (if (and (base-char-p byte) (char= byte #\Newline))
255 (setf (fd-stream-char-pos stream) 0)
256 (incf (fd-stream-char-pos stream)))
257 (setf (sap-ref-8 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
260 (def-output-routines ("OUTPUT-UNSIGNED-BYTE-~A-BUFFERED"
262 (:none (unsigned-byte 8))
263 (:full (unsigned-byte 8)))
264 (setf (sap-ref-8 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
267 (def-output-routines ("OUTPUT-SIGNED-BYTE-~A-BUFFERED"
269 (:none (signed-byte 8))
270 (:full (signed-byte 8)))
271 (setf (signed-sap-ref-8 (fd-stream-obuf-sap stream)
272 (fd-stream-obuf-tail stream))
275 (def-output-routines ("OUTPUT-UNSIGNED-SHORT-~A-BUFFERED"
277 (:none (unsigned-byte 16))
278 (:full (unsigned-byte 16)))
279 (setf (sap-ref-16 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
282 (def-output-routines ("OUTPUT-SIGNED-SHORT-~A-BUFFERED"
284 (:none (signed-byte 16))
285 (:full (signed-byte 16)))
286 (setf (signed-sap-ref-16 (fd-stream-obuf-sap stream)
287 (fd-stream-obuf-tail stream))
290 (def-output-routines ("OUTPUT-UNSIGNED-LONG-~A-BUFFERED"
292 (:none (unsigned-byte 32))
293 (:full (unsigned-byte 32)))
294 (setf (sap-ref-32 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
297 (def-output-routines ("OUTPUT-SIGNED-LONG-~A-BUFFERED"
299 (:none (signed-byte 32))
300 (:full (signed-byte 32)))
301 (setf (signed-sap-ref-32 (fd-stream-obuf-sap stream)
302 (fd-stream-obuf-tail stream))
305 ;;; Do the actual output. If there is space to buffer the string,
306 ;;; buffer it. If the string would normally fit in the buffer, but
307 ;;; doesn't because of other stuff in the buffer, flush the old noise
308 ;;; out of the buffer and put the string in it. Otherwise we have a
309 ;;; very long string, so just send it directly (after flushing the
310 ;;; buffer, of course).
311 (defun output-raw-bytes (fd-stream thing &optional start end)
313 "Output THING to FD-STREAM. THING can be any kind of vector or a SAP. If
314 THING is a SAP, END must be supplied (as length won't work)."
315 (let ((start (or start 0))
316 (end (or end (length (the (simple-array * (*)) thing)))))
317 (declare (type index start end))
318 (when (> (fd-stream-ibuf-tail fd-stream)
319 (fd-stream-ibuf-head fd-stream))
320 (file-position fd-stream (file-position fd-stream)))
321 (let* ((len (fd-stream-obuf-length fd-stream))
322 (tail (fd-stream-obuf-tail fd-stream))
324 (bytes (- end start))
325 (newtail (+ tail bytes)))
326 (cond ((minusp bytes) ; error case
327 (error ":END before :START!"))
328 ((zerop bytes)) ; easy case
330 (if (system-area-pointer-p thing)
331 (system-area-copy thing
332 (* start sb!vm:n-byte-bits)
333 (fd-stream-obuf-sap fd-stream)
334 (* tail sb!vm:n-byte-bits)
335 (* bytes sb!vm:n-byte-bits))
336 ;; FIXME: There should be some type checking somewhere to
337 ;; verify that THING here is a vector, not just <not a SAP>.
338 (copy-to-system-area thing
339 (+ (* start sb!vm:n-byte-bits)
340 (* sb!vm:vector-data-offset
342 (fd-stream-obuf-sap fd-stream)
343 (* tail sb!vm:n-byte-bits)
344 (* bytes sb!vm:n-byte-bits)))
345 (setf (fd-stream-obuf-tail fd-stream) newtail))
347 (flush-output-buffer fd-stream)
348 (if (system-area-pointer-p thing)
349 (system-area-copy thing
350 (* start sb!vm:n-byte-bits)
351 (fd-stream-obuf-sap fd-stream)
353 (* bytes sb!vm:n-byte-bits))
354 ;; FIXME: There should be some type checking somewhere to
355 ;; verify that THING here is a vector, not just <not a SAP>.
356 (copy-to-system-area thing
357 (+ (* start sb!vm:n-byte-bits)
358 (* sb!vm:vector-data-offset
360 (fd-stream-obuf-sap fd-stream)
362 (* bytes sb!vm:n-byte-bits)))
363 (setf (fd-stream-obuf-tail fd-stream) bytes))
365 (flush-output-buffer fd-stream)
366 (frob-output fd-stream thing start end nil))))))
368 ;;; the routine to use to output a string. If the stream is
369 ;;; unbuffered, slam the string down the file descriptor, otherwise
370 ;;; use OUTPUT-RAW-BYTES to buffer the string. Update charpos by
371 ;;; checking to see where the last newline was.
373 ;;; Note: some bozos (the FASL dumper) call write-string with things
374 ;;; other than strings. Therefore, we must make sure we have a string
375 ;;; before calling POSITION on it.
376 ;;; KLUDGE: It would be better to fix the bozos instead of trying to
377 ;;; cover for them here. -- WHN 20000203
378 (defun fd-sout (stream thing start end)
379 (let ((start (or start 0))
380 (end (or end (length (the vector thing)))))
381 (declare (fixnum start end))
383 (let ((last-newline (and (find #\newline (the simple-string thing)
384 :start start :end end)
385 ;; FIXME why do we need both calls?
386 ;; Is find faster forwards than
387 ;; position is backwards?
388 (position #\newline (the simple-string thing)
392 (ecase (fd-stream-buffering stream)
394 (output-raw-bytes stream thing start end))
396 (output-raw-bytes stream thing start end)
398 (flush-output-buffer stream)))
400 (frob-output stream thing start end nil)))
402 (setf (fd-stream-char-pos stream)
403 (- end last-newline 1))
404 (incf (fd-stream-char-pos stream)
406 (ecase (fd-stream-buffering stream)
408 (output-raw-bytes stream thing start end))
410 (frob-output stream thing start end nil))))))
412 ;;; Find an output routine to use given the type and buffering. Return
413 ;;; as multiple values the routine, the real type transfered, and the
414 ;;; number of bytes per element.
415 (defun pick-output-routine (type buffering)
416 (dolist (entry *output-routines*)
417 (when (and (subtypep type (car entry))
418 (eq buffering (cadr entry)))
419 (return-from pick-output-routine
420 (values (symbol-function (caddr entry))
423 ;; KLUDGE: dealing with the buffering here leads to excessive code
426 ;; KLUDGE: also see comments in PICK-INPUT-ROUTINE
427 (loop for i from 40 by 8 to 1024 ; ARB (KLUDGE)
428 if (subtypep type `(unsigned-byte ,i))
429 do (return-from pick-output-routine
433 (lambda (stream byte)
434 (output-wrapper (stream (/ i 8) (:none))
435 (loop for j from 0 below (/ i 8)
437 (fd-stream-obuf-sap stream)
438 (+ j (fd-stream-obuf-tail stream)))
439 (ldb (byte 8 (- i 8 (* j 8))) byte))))))
441 (lambda (stream byte)
442 (output-wrapper (stream (/ i 8) (:full))
443 (loop for j from 0 below (/ i 8)
445 (fd-stream-obuf-sap stream)
446 (+ j (fd-stream-obuf-tail stream)))
447 (ldb (byte 8 (- i 8 (* j 8))) byte)))))))
450 (loop for i from 40 by 8 to 1024 ; ARB (KLUDGE)
451 if (subtypep type `(signed-byte ,i))
452 do (return-from pick-output-routine
456 (lambda (stream byte)
457 (output-wrapper (stream (/ i 8) (:none))
458 (loop for j from 0 below (/ i 8)
460 (fd-stream-obuf-sap stream)
461 (+ j (fd-stream-obuf-tail stream)))
462 (ldb (byte 8 (- i 8 (* j 8))) byte))))))
464 (lambda (stream byte)
465 (output-wrapper (stream (/ i 8) (:full))
466 (loop for j from 0 below (/ i 8)
468 (fd-stream-obuf-sap stream)
469 (+ j (fd-stream-obuf-tail stream)))
470 (ldb (byte 8 (- i 8 (* j 8))) byte)))))))
474 ;;;; input routines and related noise
476 ;;; a list of all available input routines. Each element is a list of
477 ;;; the element-type input, the function name, and the number of bytes
479 (defvar *input-routines* ())
481 ;;; Fill the input buffer, and return the first character. Throw to
482 ;;; EOF-INPUT-CATCHER if the eof was reached. Drop into SYSTEM:SERVER
484 (defun frob-input (stream)
485 (let ((fd (fd-stream-fd stream))
486 (ibuf-sap (fd-stream-ibuf-sap stream))
487 (buflen (fd-stream-ibuf-length stream))
488 (head (fd-stream-ibuf-head stream))
489 (tail (fd-stream-ibuf-tail stream)))
490 (declare (type index head tail))
492 (cond ((eql head tail)
495 (setf (fd-stream-ibuf-head stream) 0)
496 (setf (fd-stream-ibuf-tail stream) 0))
499 (system-area-copy ibuf-sap (* head sb!vm:n-byte-bits)
500 ibuf-sap 0 (* tail sb!vm:n-byte-bits))
502 (setf (fd-stream-ibuf-head stream) 0)
503 (setf (fd-stream-ibuf-tail stream) tail))))
504 (setf (fd-stream-listen stream) nil)
505 (multiple-value-bind (count errno)
506 ;; FIXME: Judging from compiler warnings, this WITH-ALIEN form expands
507 ;; into something which uses the not-yet-defined type
508 ;; (SB!ALIEN-INTERNALS:ALIEN (* (SB!ALIEN:STRUCT SB!UNIX:FD-SET))).
509 ;; This is probably inefficient and unsafe and generally bad, so
510 ;; try to find some way to make that type known before
512 (sb!alien:with-alien ((read-fds (sb!alien:struct sb!unix:fd-set)))
513 (sb!unix:fd-zero read-fds)
514 (sb!unix:fd-set fd read-fds)
515 (sb!unix:unix-fast-select (1+ fd)
516 (sb!alien:addr read-fds)
524 (unless (sb!sys:wait-until-fd-usable
525 fd :input (fd-stream-timeout stream))
526 (error 'io-timeout :stream stream :direction :read)))
528 (simple-stream-perror "couldn't check whether ~S is readable"
531 (multiple-value-bind (count errno)
532 (sb!unix:unix-read fd
533 (sb!sys:int-sap (+ (sb!sys:sap-int ibuf-sap) tail))
536 (if (eql errno sb!unix:ewouldblock)
538 (unless (sb!sys:wait-until-fd-usable
539 fd :input (fd-stream-timeout stream))
540 (error 'io-timeout :stream stream :direction :read))
542 (simple-stream-perror "couldn't read from ~S" stream errno)))
544 (setf (fd-stream-listen stream) :eof)
545 (/show0 "THROWing EOF-INPUT-CATCHER")
546 (throw 'eof-input-catcher nil))
548 (incf (fd-stream-ibuf-tail stream) count))))))
550 ;;; Make sure there are at least BYTES number of bytes in the input
551 ;;; buffer. Keep calling FROB-INPUT until that condition is met.
552 (defmacro input-at-least (stream bytes)
553 (let ((stream-var (gensym))
554 (bytes-var (gensym)))
555 `(let ((,stream-var ,stream)
558 (when (>= (- (fd-stream-ibuf-tail ,stream-var)
559 (fd-stream-ibuf-head ,stream-var))
562 (frob-input ,stream-var)))))
564 ;;; a macro to wrap around all input routines to handle EOF-ERROR noise
565 (defmacro input-wrapper ((stream bytes eof-error eof-value) &body read-forms)
566 (let ((stream-var (gensym))
567 (element-var (gensym)))
568 `(let ((,stream-var ,stream))
569 (if (fd-stream-unread ,stream-var)
571 (fd-stream-unread ,stream-var)
572 (setf (fd-stream-unread ,stream-var) nil)
573 (setf (fd-stream-listen ,stream-var) nil))
575 (catch 'eof-input-catcher
576 (input-at-least ,stream-var ,bytes)
579 (incf (fd-stream-ibuf-head ,stream-var) ,bytes)
582 (eof-or-lose ,stream-var ,eof-error ,eof-value))))))))
584 (defmacro def-input-routine (name
588 (defun ,name (stream eof-error eof-value)
589 (input-wrapper (stream ,size eof-error eof-value)
590 (let ((,sap (fd-stream-ibuf-sap stream))
591 (,head (fd-stream-ibuf-head stream)))
593 (setf *input-routines*
594 (nconc *input-routines*
595 (list (list ',type ',name ',size))))))
597 ;;; STREAM-IN routine for reading a string char
598 (def-input-routine input-character
599 (character 1 sap head)
600 (code-char (sap-ref-8 sap head)))
602 ;;; STREAM-IN routine for reading an unsigned 8 bit number
603 (def-input-routine input-unsigned-8bit-byte
604 ((unsigned-byte 8) 1 sap head)
605 (sap-ref-8 sap head))
607 ;;; STREAM-IN routine for reading a signed 8 bit number
608 (def-input-routine input-signed-8bit-number
609 ((signed-byte 8) 1 sap head)
610 (signed-sap-ref-8 sap head))
612 ;;; STREAM-IN routine for reading an unsigned 16 bit number
613 (def-input-routine input-unsigned-16bit-byte
614 ((unsigned-byte 16) 2 sap head)
615 (sap-ref-16 sap head))
617 ;;; STREAM-IN routine for reading a signed 16 bit number
618 (def-input-routine input-signed-16bit-byte
619 ((signed-byte 16) 2 sap head)
620 (signed-sap-ref-16 sap head))
622 ;;; STREAM-IN routine for reading a unsigned 32 bit number
623 (def-input-routine input-unsigned-32bit-byte
624 ((unsigned-byte 32) 4 sap head)
625 (sap-ref-32 sap head))
627 ;;; STREAM-IN routine for reading a signed 32 bit number
628 (def-input-routine input-signed-32bit-byte
629 ((signed-byte 32) 4 sap head)
630 (signed-sap-ref-32 sap head))
632 ;;; Find an input routine to use given the type. Return as multiple
633 ;;; values the routine, the real type transfered, and the number of
634 ;;; bytes per element.
635 (defun pick-input-routine (type)
636 (dolist (entry *input-routines*)
637 (when (subtypep type (car entry))
638 (return-from pick-input-routine
639 (values (symbol-function (cadr entry))
642 ;; FIXME: let's do it the hard way, then (but ignore things like
643 ;; endianness, efficiency, and the necessary coupling between these
644 ;; and the output routines). -- CSR, 2004-02-09
645 (loop for i from 40 by 8 to 1024 ; ARB (well, KLUDGE really)
646 if (subtypep type `(unsigned-byte ,i))
647 do (return-from pick-input-routine
649 (lambda (stream eof-error eof-value)
650 (input-wrapper (stream (/ i 8) eof-error eof-value)
651 (let ((sap (fd-stream-ibuf-sap stream))
652 (head (fd-stream-ibuf-head stream)))
653 (loop for j from 0 below (/ i 8)
657 (sap-ref-8 sap (+ head j))))
658 finally (return result)))))
661 (loop for i from 40 by 8 to 1024 ; ARB (well, KLUDGE really)
662 if (subtypep type `(signed-byte ,i))
663 do (return-from pick-input-routine
665 (lambda (stream eof-error eof-value)
666 (let ((sap (fd-stream-ibuf-sap stream))
667 (head (fd-stream-ibuf-head stream)))
668 (loop for j from 0 below (/ i 8)
672 (sap-ref-8 sap (+ head j))))
673 finally (return (dpb result (byte i 0) -1)))))
677 ;;; Return a string constructed from SAP, START, and END.
678 (defun string-from-sap (sap start end)
679 (declare (type index start end))
680 (let* ((length (- end start))
681 (string (make-string length)))
682 (copy-from-system-area sap (* start sb!vm:n-byte-bits)
683 string (* sb!vm:vector-data-offset
685 (* length sb!vm:n-byte-bits))
688 ;;; the N-BIN method for FD-STREAMs
690 ;;; Note that this blocks in UNIX-READ. It is generally used where
691 ;;; there is a definite amount of reading to be done, so blocking
692 ;;; isn't too problematical.
693 (defun fd-stream-read-n-bytes (stream buffer start requested eof-error-p
694 &aux (total-copied 0))
695 (declare (type file-stream stream))
696 (declare (type index start requested total-copied))
697 (let ((unread (fd-stream-unread stream)))
699 ;; AVERs designed to fail when we have more complicated
700 ;; character representations.
701 (aver (typep unread 'base-char))
702 (aver (= (fd-stream-element-size stream) 1))
703 ;; KLUDGE: this is a slightly-unrolled-and-inlined version of
707 (setf (sap-ref-8 buffer start) (char-code unread)))
708 ((simple-unboxed-array (*))
709 (setf (aref buffer start) unread)))
710 (setf (fd-stream-unread stream) nil)
711 (setf (fd-stream-listen stream) nil)
712 (incf total-copied)))
715 (let* ((remaining-request (- requested total-copied))
716 (head (fd-stream-ibuf-head stream))
717 (tail (fd-stream-ibuf-tail stream))
718 (available (- tail head))
719 (n-this-copy (min remaining-request available))
720 (this-start (+ start total-copied))
721 (this-end (+ this-start n-this-copy))
722 (sap (fd-stream-ibuf-sap stream)))
723 (declare (type index remaining-request head tail available))
724 (declare (type index n-this-copy))
725 ;; Copy data from stream buffer into user's buffer.
726 (%byte-blt sap head buffer this-start this-end)
727 (incf (fd-stream-ibuf-head stream) n-this-copy)
728 (incf total-copied n-this-copy)
729 ;; Maybe we need to refill the stream buffer.
730 (cond (;; If there were enough data in the stream buffer, we're done.
731 (= total-copied requested)
732 (return total-copied))
733 (;; If EOF, we're done in another way.
734 (zerop (refill-fd-stream-buffer stream))
736 (error 'end-of-file :stream stream)
737 (return total-copied)))
738 ;; Otherwise we refilled the stream buffer, so fall
739 ;; through into another pass of the loop.
742 ;;; Try to refill the stream buffer. Return the number of bytes read.
743 ;;; (For EOF, the return value will be zero, otherwise positive.)
744 (defun refill-fd-stream-buffer (stream)
745 ;; We don't have any logic to preserve leftover bytes in the buffer,
746 ;; so we should only be called when the buffer is empty.
747 (aver (= (fd-stream-ibuf-head stream) (fd-stream-ibuf-tail stream)))
748 (multiple-value-bind (count err)
749 (sb!unix:unix-read (fd-stream-fd stream)
750 (fd-stream-ibuf-sap stream)
751 (fd-stream-ibuf-length stream))
752 (declare (type (or index null) count))
754 (simple-stream-perror "couldn't read from ~S" stream err))
755 (setf (fd-stream-listen stream) nil
756 (fd-stream-ibuf-head stream) 0
757 (fd-stream-ibuf-tail stream) count)
760 ;;;; utility functions (misc routines, etc)
762 ;;; Fill in the various routine slots for the given type. INPUT-P and
763 ;;; OUTPUT-P indicate what slots to fill. The buffering slot must be
764 ;;; set prior to calling this routine.
765 (defun set-fd-stream-routines (fd-stream type input-p output-p buffer-p)
766 (let ((target-type (case type
767 ((:default unsigned-byte)
778 (when (fd-stream-obuf-sap fd-stream)
779 (push (fd-stream-obuf-sap fd-stream) *available-buffers*)
780 (setf (fd-stream-obuf-sap fd-stream) nil))
781 (when (fd-stream-ibuf-sap fd-stream)
782 (push (fd-stream-ibuf-sap fd-stream) *available-buffers*)
783 (setf (fd-stream-ibuf-sap fd-stream) nil))
786 (multiple-value-bind (routine type size)
787 (pick-input-routine target-type)
789 (error "could not find any input routine for ~S" target-type))
790 (setf (fd-stream-ibuf-sap fd-stream) (next-available-buffer))
791 (setf (fd-stream-ibuf-length fd-stream) bytes-per-buffer)
792 (setf (fd-stream-ibuf-tail fd-stream) 0)
793 (if (subtypep type 'character)
794 (setf (fd-stream-in fd-stream) routine
795 (fd-stream-bin fd-stream) #'ill-bin)
796 (setf (fd-stream-in fd-stream) #'ill-in
797 (fd-stream-bin fd-stream) routine))
799 (setf (fd-stream-n-bin fd-stream) #'fd-stream-read-n-bytes)
801 ;; We only create this buffer for streams of type
802 ;; (unsigned-byte 8). Because there's no buffer, the
803 ;; other element-types will dispatch to the appropriate
804 ;; input (output) routine in fast-read-byte.
805 (equal target-type '(unsigned-byte 8))
807 (or (eq type 'unsigned-byte)
809 (setf (ansi-stream-in-buffer fd-stream)
810 (make-array +ansi-stream-in-buffer-length+
811 :element-type '(unsigned-byte 8)))))
812 (setf input-size size)
813 (setf input-type type)))
816 (multiple-value-bind (routine type size)
817 (pick-output-routine target-type (fd-stream-buffering fd-stream))
819 (error "could not find any output routine for ~S buffered ~S"
820 (fd-stream-buffering fd-stream)
822 (setf (fd-stream-obuf-sap fd-stream) (next-available-buffer))
823 (setf (fd-stream-obuf-length fd-stream) bytes-per-buffer)
824 (setf (fd-stream-obuf-tail fd-stream) 0)
825 (if (subtypep type 'character)
826 (setf (fd-stream-out fd-stream) routine
827 (fd-stream-bout fd-stream) #'ill-bout)
828 (setf (fd-stream-out fd-stream)
830 (pick-output-routine 'base-char
831 (fd-stream-buffering fd-stream)))
833 (fd-stream-bout fd-stream) routine))
834 (setf (fd-stream-sout fd-stream)
835 (if (eql size 1) #'fd-sout #'ill-out))
836 (setf (fd-stream-char-pos fd-stream) 0)
837 (setf output-size size)
838 (setf output-type type)))
840 (when (and input-size output-size
841 (not (eq input-size output-size)))
842 (error "Element sizes for input (~S:~S) and output (~S:~S) differ?"
843 input-type input-size
844 output-type output-size))
845 (setf (fd-stream-element-size fd-stream)
846 (or input-size output-size))
848 (setf (fd-stream-element-type fd-stream)
849 (cond ((equal input-type output-type)
855 ((subtypep input-type output-type)
857 ((subtypep output-type input-type)
860 (error "Input type (~S) and output type (~S) are unrelated?"
864 ;;; Handle miscellaneous operations on FD-STREAM.
865 (defun fd-stream-misc-routine (fd-stream operation &optional arg1 arg2)
866 (declare (ignore arg2))
869 (or (not (eql (fd-stream-ibuf-head fd-stream)
870 (fd-stream-ibuf-tail fd-stream)))
871 (fd-stream-listen fd-stream)
872 (setf (fd-stream-listen fd-stream)
873 (eql (sb!alien:with-alien ((read-fds (sb!alien:struct
875 (sb!unix:fd-zero read-fds)
876 (sb!unix:fd-set (fd-stream-fd fd-stream) read-fds)
877 (sb!unix:unix-fast-select (1+ (fd-stream-fd fd-stream))
878 (sb!alien:addr read-fds)
882 (setf (fd-stream-unread fd-stream) arg1)
883 (setf (fd-stream-listen fd-stream) t))
886 ;; We got us an abort on our hands.
887 (when (fd-stream-handler fd-stream)
888 (sb!sys:remove-fd-handler (fd-stream-handler fd-stream))
889 (setf (fd-stream-handler fd-stream) nil))
890 (when (and (fd-stream-file fd-stream)
891 (fd-stream-obuf-sap fd-stream))
892 ;; We can't do anything unless we know what file were
893 ;; dealing with, and we don't want to do anything
894 ;; strange unless we were writing to the file.
895 (if (fd-stream-original fd-stream)
896 ;; We have a handle on the original, just revert.
897 (multiple-value-bind (okay err)
898 (sb!unix:unix-rename (fd-stream-original fd-stream)
899 (fd-stream-file fd-stream))
901 (simple-stream-perror
902 "couldn't restore ~S to its original contents"
905 ;; We can't restore the original, so nuke that puppy.
906 (multiple-value-bind (okay err)
907 (sb!unix:unix-unlink (fd-stream-file fd-stream))
909 (error 'simple-file-error
910 :pathname (fd-stream-file fd-stream)
912 "~@<couldn't remove ~S: ~2I~_~A~:>"
913 :format-arguments (list (fd-stream-file fd-stream)
914 (strerror err))))))))
916 (fd-stream-misc-routine fd-stream :finish-output)
917 (when (and (fd-stream-original fd-stream)
918 (fd-stream-delete-original fd-stream))
919 (multiple-value-bind (okay err)
920 (sb!unix:unix-unlink (fd-stream-original fd-stream))
922 (error 'simple-file-error
923 :pathname (fd-stream-original fd-stream)
925 "~@<couldn't delete ~S during close of ~S: ~
928 (list (fd-stream-original fd-stream)
930 (strerror err))))))))
931 (when (fboundp 'cancel-finalization)
932 (cancel-finalization fd-stream))
933 (sb!unix:unix-close (fd-stream-fd fd-stream))
934 (when (fd-stream-obuf-sap fd-stream)
935 (push (fd-stream-obuf-sap fd-stream) *available-buffers*)
936 (setf (fd-stream-obuf-sap fd-stream) nil))
937 (when (fd-stream-ibuf-sap fd-stream)
938 (push (fd-stream-ibuf-sap fd-stream) *available-buffers*)
939 (setf (fd-stream-ibuf-sap fd-stream) nil))
940 (sb!impl::set-closed-flame fd-stream))
942 (setf (fd-stream-unread fd-stream) nil)
943 (setf (fd-stream-ibuf-head fd-stream) 0)
944 (setf (fd-stream-ibuf-tail fd-stream) 0)
945 (catch 'eof-input-catcher
947 (let ((count (sb!alien:with-alien ((read-fds (sb!alien:struct
949 (sb!unix:fd-zero read-fds)
950 (sb!unix:fd-set (fd-stream-fd fd-stream) read-fds)
951 (sb!unix:unix-fast-select (1+ (fd-stream-fd fd-stream))
952 (sb!alien:addr read-fds)
958 (frob-input fd-stream)
959 (setf (fd-stream-ibuf-head fd-stream) 0)
960 (setf (fd-stream-ibuf-tail fd-stream) 0))
964 (flush-output-buffer fd-stream))
966 (flush-output-buffer fd-stream)
968 ((null (fd-stream-output-later fd-stream)))
969 (sb!sys:serve-all-events)))
971 (fd-stream-element-type fd-stream))
973 (= 1 (the (member 0 1)
974 (sb!unix:unix-isatty (fd-stream-fd fd-stream)))))
978 (fd-stream-char-pos fd-stream))
980 (unless (fd-stream-file fd-stream)
981 ;; This is a TYPE-ERROR because ANSI's species FILE-LENGTH
982 ;; "should signal an error of type TYPE-ERROR if stream is not
983 ;; a stream associated with a file". Too bad there's no very
984 ;; appropriate value for the EXPECTED-TYPE slot..
985 (error 'simple-type-error
987 :expected-type 'file-stream
988 :format-control "~S is not a stream associated with a file."
989 :format-arguments (list fd-stream)))
990 (multiple-value-bind (okay dev ino mode nlink uid gid rdev size
991 atime mtime ctime blksize blocks)
992 (sb!unix:unix-fstat (fd-stream-fd fd-stream))
993 (declare (ignore ino nlink uid gid rdev
994 atime mtime ctime blksize blocks))
996 (simple-stream-perror "failed Unix fstat(2) on ~S" fd-stream dev))
999 (truncate size (fd-stream-element-size fd-stream)))))
1001 (fd-stream-file-position fd-stream arg1))))
1003 (defun fd-stream-file-position (stream &optional newpos)
1004 (declare (type file-stream stream)
1005 (type (or (alien sb!unix:off-t) (member nil :start :end)) newpos))
1007 (sb!sys:without-interrupts
1008 ;; First, find the position of the UNIX file descriptor in the file.
1009 (multiple-value-bind (posn errno)
1010 (sb!unix:unix-lseek (fd-stream-fd stream) 0 sb!unix:l_incr)
1011 (declare (type (or (alien sb!unix:off-t) null) posn))
1012 (cond ((integerp posn)
1013 ;; Adjust for buffered output: If there is any output
1014 ;; buffered, the *real* file position will be larger
1015 ;; than reported by lseek() because lseek() obviously
1016 ;; cannot take into account output we have not sent
1018 (dolist (later (fd-stream-output-later stream))
1019 (incf posn (- (caddr later)
1021 (incf posn (fd-stream-obuf-tail stream))
1022 ;; Adjust for unread input: If there is any input
1023 ;; read from UNIX but not supplied to the user of the
1024 ;; stream, the *real* file position will smaller than
1025 ;; reported, because we want to look like the unread
1026 ;; stuff is still available.
1027 (decf posn (- (fd-stream-ibuf-tail stream)
1028 (fd-stream-ibuf-head stream)))
1029 (when (fd-stream-unread stream)
1031 ;; Divide bytes by element size.
1032 (truncate posn (fd-stream-element-size stream)))
1033 ((eq errno sb!unix:espipe)
1036 (sb!sys:with-interrupts
1037 (simple-stream-perror "failure in Unix lseek() on ~S"
1040 (let ((offset 0) origin)
1041 (declare (type (alien sb!unix:off-t) offset))
1042 ;; Make sure we don't have any output pending, because if we
1043 ;; move the file pointer before writing this stuff, it will be
1044 ;; written in the wrong location.
1045 (flush-output-buffer stream)
1047 ((null (fd-stream-output-later stream)))
1048 (sb!sys:serve-all-events))
1049 ;; Clear out any pending input to force the next read to go to
1051 (setf (fd-stream-unread stream) nil)
1052 (setf (fd-stream-ibuf-head stream) 0)
1053 (setf (fd-stream-ibuf-tail stream) 0)
1054 ;; Trash cached value for listen, so that we check next time.
1055 (setf (fd-stream-listen stream) nil)
1057 (cond ((eq newpos :start)
1058 (setf offset 0 origin sb!unix:l_set))
1060 (setf offset 0 origin sb!unix:l_xtnd))
1061 ((typep newpos '(alien sb!unix:off-t))
1062 (setf offset (* newpos (fd-stream-element-size stream))
1063 origin sb!unix:l_set))
1065 (error "invalid position given to FILE-POSITION: ~S" newpos)))
1066 (multiple-value-bind (posn errno)
1067 (sb!unix:unix-lseek (fd-stream-fd stream) offset origin)
1068 (cond ((typep posn '(alien sb!unix:off-t))
1070 ((eq errno sb!unix:espipe)
1073 (simple-stream-perror "error in Unix lseek() on ~S"
1077 ;;;; creation routines (MAKE-FD-STREAM and OPEN)
1079 ;;; Create a stream for the given Unix file descriptor.
1081 ;;; If INPUT is non-NIL, allow input operations. If OUTPUT is non-nil,
1082 ;;; allow output operations. If neither INPUT nor OUTPUT is specified,
1083 ;;; default to allowing input.
1085 ;;; ELEMENT-TYPE indicates the element type to use (as for OPEN).
1087 ;;; BUFFERING indicates the kind of buffering to use.
1089 ;;; TIMEOUT (if true) is the number of seconds to wait for input. If
1090 ;;; NIL (the default), then wait forever. When we time out, we signal
1093 ;;; FILE is the name of the file (will be returned by PATHNAME).
1095 ;;; NAME is used to identify the stream when printed.
1096 (defun make-fd-stream (fd
1099 (output nil output-p)
1100 (element-type 'base-char)
1109 (format nil "file ~S" file)
1110 (format nil "descriptor ~W" fd)))
1112 (declare (type index fd) (type (or index null) timeout)
1113 (type (member :none :line :full) buffering))
1114 (cond ((not (or input-p output-p))
1116 ((not (or input output))
1117 (error "File descriptor must be opened either for input or output.")))
1118 (let ((stream (%make-fd-stream :fd fd
1122 :delete-original delete-original
1124 :buffering buffering
1126 (set-fd-stream-routines stream element-type input output input-buffer-p)
1127 (when (and auto-close (fboundp 'finalize))
1130 (sb!unix:unix-close fd)
1132 (format *terminal-io* "** closed file descriptor ~W **~%"
1136 ;;; Pick a name to use for the backup file for the :IF-EXISTS
1137 ;;; :RENAME-AND-DELETE and :RENAME options.
1138 (defun pick-backup-name (name)
1139 (declare (type simple-base-string name))
1140 (concatenate 'simple-base-string name ".bak"))
1142 ;;; Ensure that the given arg is one of the given list of valid
1143 ;;; things. Allow the user to fix any problems.
1144 (defun ensure-one-of (item list what)
1145 (unless (member item list)
1146 (error 'simple-type-error
1148 :expected-type `(member ,@list)
1149 :format-control "~@<~S is ~_invalid for ~S; ~_need one of~{ ~S~}~:>"
1150 :format-arguments (list item what list))))
1152 ;;; Rename NAMESTRING to ORIGINAL. First, check whether we have write
1153 ;;; access, since we don't want to trash unwritable files even if we
1154 ;;; technically can. We return true if we succeed in renaming.
1155 (defun rename-the-old-one (namestring original)
1156 (unless (sb!unix:unix-access namestring sb!unix:w_ok)
1157 (error "~@<The file ~2I~_~S ~I~_is not writable.~:>" namestring))
1158 (multiple-value-bind (okay err) (sb!unix:unix-rename namestring original)
1161 (error 'simple-file-error
1162 :pathname namestring
1164 "~@<couldn't rename ~2I~_~S ~I~_to ~2I~_~S: ~4I~_~A~:>"
1165 :format-arguments (list namestring original (strerror err))))))
1167 (defun open (filename
1170 (element-type 'base-char)
1171 (if-exists nil if-exists-given)
1172 (if-does-not-exist nil if-does-not-exist-given)
1173 (external-format :default)
1174 &aux ; Squelch assignment warning.
1175 (direction direction)
1176 (if-does-not-exist if-does-not-exist)
1177 (if-exists if-exists))
1179 "Return a stream which reads from or writes to FILENAME.
1181 :DIRECTION - one of :INPUT, :OUTPUT, :IO, or :PROBE
1182 :ELEMENT-TYPE - the type of object to read or write, default BASE-CHAR
1183 :IF-EXISTS - one of :ERROR, :NEW-VERSION, :RENAME, :RENAME-AND-DELETE,
1184 :OVERWRITE, :APPEND, :SUPERSEDE or NIL
1185 :IF-DOES-NOT-EXIST - one of :ERROR, :CREATE or NIL
1186 See the manual for details."
1188 ;; Calculate useful stuff.
1189 (multiple-value-bind (input output mask)
1191 (:input (values t nil sb!unix:o_rdonly))
1192 (:output (values nil t sb!unix:o_wronly))
1193 (:io (values t t sb!unix:o_rdwr))
1194 (:probe (values t nil sb!unix:o_rdonly)))
1195 (declare (type index mask))
1196 (let* ((pathname (merge-pathnames filename))
1198 (cond ((unix-namestring pathname input))
1199 ((and input (eq if-does-not-exist :create))
1200 (unix-namestring pathname nil))
1201 ((and (eq direction :io) (not if-does-not-exist-given))
1202 (unix-namestring pathname nil)))))
1203 ;; Process if-exists argument if we are doing any output.
1205 (unless if-exists-given
1207 (if (eq (pathname-version pathname) :newest)
1210 (ensure-one-of if-exists
1211 '(:error :new-version :rename
1212 :rename-and-delete :overwrite
1213 :append :supersede nil)
1216 ((:new-version :error nil)
1217 (setf mask (logior mask sb!unix:o_excl)))
1218 ((:rename :rename-and-delete)
1219 (setf mask (logior mask sb!unix:o_creat)))
1221 (setf mask (logior mask sb!unix:o_trunc)))
1223 (setf mask (logior mask sb!unix:o_append)))))
1225 (setf if-exists :ignore-this-arg)))
1227 (unless if-does-not-exist-given
1228 (setf if-does-not-exist
1229 (cond ((eq direction :input) :error)
1231 (member if-exists '(:overwrite :append)))
1233 ((eq direction :probe)
1237 (ensure-one-of if-does-not-exist
1238 '(:error :create nil)
1240 (if (eq if-does-not-exist :create)
1241 (setf mask (logior mask sb!unix:o_creat)))
1243 (let ((original (if (member if-exists
1244 '(:rename :rename-and-delete))
1245 (pick-backup-name namestring)))
1246 (delete-original (eq if-exists :rename-and-delete))
1249 ;; We are doing a :RENAME or :RENAME-AND-DELETE. Determine
1250 ;; whether the file already exists, make sure the original
1251 ;; file is not a directory, and keep the mode.
1254 (multiple-value-bind (okay err/dev inode orig-mode)
1255 (sb!unix:unix-stat namestring)
1256 (declare (ignore inode)
1257 (type (or index null) orig-mode))
1260 (when (and output (= (logand orig-mode #o170000)
1262 (error 'simple-file-error
1263 :pathname namestring
1265 "can't open ~S for output: is a directory"
1266 :format-arguments (list namestring)))
1267 (setf mode (logand orig-mode #o777))
1269 ((eql err/dev sb!unix:enoent)
1272 (simple-file-perror "can't find ~S"
1276 (rename-the-old-one namestring original))
1278 (setf delete-original nil)
1279 ;; In order to use :SUPERSEDE instead, we have to make
1280 ;; sure SB!UNIX:O_CREAT corresponds to
1281 ;; IF-DOES-NOT-EXIST. SB!UNIX:O_CREAT was set before
1282 ;; because of IF-EXISTS being :RENAME.
1283 (unless (eq if-does-not-exist :create)
1285 (logior (logandc2 mask sb!unix:o_creat)
1287 (setf if-exists :supersede))))
1289 ;; Now we can try the actual Unix open(2).
1290 (multiple-value-bind (fd errno)
1292 (sb!unix:unix-open namestring mask mode)
1293 (values nil sb!unix:enoent))
1294 (labels ((open-error (format-control &rest format-arguments)
1295 (error 'simple-file-error
1297 :format-control format-control
1298 :format-arguments format-arguments))
1299 (vanilla-open-error ()
1300 (simple-file-perror "error opening ~S" pathname errno)))
1303 ((:input :output :io)
1307 :element-type element-type
1310 :delete-original delete-original
1316 (%make-fd-stream :name namestring
1319 :element-type element-type)))
1322 ((eql errno sb!unix:enoent)
1323 (case if-does-not-exist
1324 (:error (vanilla-open-error))
1326 (open-error "~@<The path ~2I~_~S ~I~_does not exist.~:>"
1329 ((and (eql errno sb!unix:eexist) (null if-exists))
1332 (vanilla-open-error)))))))))
1336 ;;; the stream connected to the controlling terminal, or NIL if there is none
1339 ;;; the stream connected to the standard input (file descriptor 0)
1342 ;;; the stream connected to the standard output (file descriptor 1)
1345 ;;; the stream connected to the standard error output (file descriptor 2)
1348 ;;; This is called when the cold load is first started up, and may also
1349 ;;; be called in an attempt to recover from nested errors.
1350 (defun stream-cold-init-or-reset ()
1352 (setf *terminal-io* (make-synonym-stream '*tty*))
1353 (setf *standard-output* (make-synonym-stream '*stdout*))
1354 (setf *standard-input* (make-synonym-stream '*stdin*))
1355 (setf *error-output* (make-synonym-stream '*stderr*))
1356 (setf *query-io* (make-synonym-stream '*terminal-io*))
1357 (setf *debug-io* *query-io*)
1358 (setf *trace-output* *standard-output*)
1361 ;;; This is called whenever a saved core is restarted.
1362 (defun stream-reinit ()
1363 (setf *available-buffers* nil)
1365 (make-fd-stream 0 :name "standard input" :input t :buffering :line))
1367 (make-fd-stream 1 :name "standard output" :output t :buffering :line))
1369 (make-fd-stream 2 :name "standard error" :output t :buffering :line))
1370 (let ((tty (sb!unix:unix-open "/dev/tty" sb!unix:o_rdwr #o666)))
1374 :name "the terminal"
1379 (setf *tty* (make-two-way-stream *stdin* *stdout*))))
1384 ;;; the Unix way to beep
1385 (defun beep (stream)
1386 (write-char (code-char bell-char-code) stream)
1387 (finish-output stream))
1389 ;;; This is kind of like FILE-POSITION, but is an internal hack used
1390 ;;; by the filesys stuff to get and set the file name.
1392 ;;; FIXME: misleading name, screwy interface
1393 (defun file-name (stream &optional new-name)
1394 (when (typep stream 'file-stream)
1396 (setf (fd-stream-pathname stream) new-name)
1397 (setf (fd-stream-file stream)
1398 (unix-namestring new-name nil))
1401 (fd-stream-pathname stream)))))
1403 ;;;; international character support (which is trivial for our simple
1404 ;;;; character sets)
1406 ;;;; (Those who do Lisp only in English might not remember that ANSI
1407 ;;;; requires these functions to be exported from package
1410 (defun file-string-length (stream object)
1411 (declare (type (or string character) object) (type file-stream stream))
1413 "Return the delta in STREAM's FILE-POSITION that would be caused by writing
1414 OBJECT to STREAM. Non-trivial only in implementations that support
1415 international character sets."
1416 (declare (ignore stream))
1419 (string (length object))))
1421 (defun stream-external-format (stream)
1422 (declare (type file-stream stream) (ignore stream))