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;;; **********************************************************************
;;; This code was written as part of the CMU Common Lisp project at
;;; Carnegie Mellon University, and has been placed in the public domain.
;;; If you want to use this code or any part of CMU Common Lisp, please contact
;;; Scott Fahlman or slisp-group@cs.cmu.edu.
;;;
(ext:file-comment
"$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/code/fd-stream.lisp,v 1.15 1991/05/24 17:02:25 ram Exp $")
;;; **********************************************************************
;;;
;;; Streams for UNIX file descriptors.
;;;
;;; Written by William Lott, July 1989 - January 1990.
;;; Some tuning by Rob MacLachlan.
;;;
;;; **********************************************************************
(in-package "SYSTEM")
(export '(fd-stream fd-stream-p fd-stream-fd make-fd-stream
io-timeout beep *beep-function* output-raw-bytes
*tty* *stdin* *stdout* *stderr*))
(in-package "EXTENSIONS")
(export '(*backup-extension*))
(in-package "LISP")
;;;; Buffer manipulation routines.
(defvar *available-buffers* ()
"List of available buffers. Each buffer is an sap pointing to
bytes-per-buffer of memory.")
(defconstant bytes-per-buffer (* 4 1024)
"Number of bytes per buffer.")
;;; NEXT-AVAILABLE-BUFFER -- Internal.
;;;
;;; Returns the next available buffer, creating one if necessary.
;;;
(proclaim '(inline next-available-buffer))
;;;
(defun next-available-buffer ()
(if *available-buffers*
(pop *available-buffers*)
(allocate-system-memory bytes-per-buffer)))
;;;; The FD-STREAM structure.
(defstruct (fd-stream
(:print-function %print-fd-stream)
(:constructor %make-fd-stream)
(:include stream
(misc #'fd-stream-misc-routine)))
(name nil) ; The name of this stream
(file nil) ; The file this stream is for
(original nil) ; The original file (for :if-exists :rename)
(delete-original nil) ; for :if-exists :rename-and-delete
;;
;;; Number of bytes per element.
(element-size 1 :type index)
(element-type 'base-character) ; The type of element being transfered.
;;
;; Controls when the output buffer is flushed.
(buffering :full :type (member :full :line :none))
;;
;; Character position if known.
(char-pos nil :type (or index null))
;;
;; T if input is waiting on FD. :EOF if we hit EOF.
(listen nil :type (member nil t :eof))
;;
(ibuf-sap nil :type (or system-area-pointer null))
(ibuf-length nil :type (or index null))
(ibuf-head 0 :type index)
(ibuf-tail 0 :type index)
(obuf-sap nil :type (or system-area-pointer null))
(obuf-length nil :type (or index null))
(obuf-tail 0 :type index)
;; Output flushed, but not written due to non-blocking io.
(output-later nil)
(handler nil)
;;
;; Timeout specified for this stream, or NIL if none.
(timeout nil :type (or index null)))
(declare (ignore depth) (stream stream))
(format stream "#<Stream for ~A>"
(fd-stream-name fd-stream)))
(define-condition io-timeout (stream-error) (direction)
(:report
(lambda (condition stream)
(format stream "Timeout ~(~A~)ing ~S."
(io-timeout-direction condition)
(stream-error-stream condition)))))
;;;; Output routines and related noise.
(defvar *output-routines* ()
"List of all available output routines. Each element is a list of the
element-type output, the kind of buffering, the function name, and the number
of bytes per element.")
;;; DO-OUTPUT-LATER -- internal
;;;
;;; Called by the server when we can write to the given file descriptor.
;;; Attemt to write the data again. If it worked, remove the data from the
;;; output-later list. If it didn't work, something is wrong.
;;;
(defun do-output-later (stream)
(let* ((stuff (pop (fd-stream-output-later stream)))
(base (car stuff))
(start (cadr stuff))
(end (caddr stuff))
(declare (type index start end length))
(multiple-value-bind
(count errno)
(mach:unix-write (fd-stream-fd stream)
base
start
length)
(cond ((not count)
(if (= errno mach:ewouldblock)
(error "Write would have blocked, but SERVER told us to go.")
(error "While writing ~S: ~A"
stream (mach:get-unix-error-msg errno))))
((eql count length) ; Hot damn, it workded.
(when reuse-sap
(push base *available-buffers*)))
((not (null count)) ; Sorta worked.
(push (list base
(+ start count)
(fd-stream-output-later stream))))))
(unless (fd-stream-output-later stream)
(system:remove-fd-handler (fd-stream-handler stream))
(setf (fd-stream-handler stream) nil)))
;;; OUTPUT-LATER -- internal
;;;
;;; Arange to output the string when we can write on the file descriptor.
;;;
(defun output-later (stream base start end reuse-sap)
(cond ((null (fd-stream-output-later stream))
(setf (fd-stream-output-later stream)
(list (list base start end reuse-sap)))
(setf (fd-stream-handler stream)
(system:add-fd-handler (fd-stream-fd stream)
:output
#'(lambda (fd)
(declare (ignore fd))
(do-output-later stream)))))
(t
(nconc (fd-stream-output-later stream)
(list (list base start end reuse-sap)))))
(when reuse-sap
(setf (fd-stream-obuf-sap stream) new-buffer)
(setf (fd-stream-obuf-length stream) bytes-per-buffer))))
;;; DO-OUTPUT -- internal
;;;
;;; Output the given noise. Check to see if there are any pending writes. If
;;; so, just queue this one. Otherwise, try to write it. If this would block,
;;; queue it.
;;;
(defun do-output (stream base start end reuse-sap)
(declare (type fd-stream stream)
(type (or system-area-pointer (simple-array * (*))) base)
(type index start end))
(if (not (null (fd-stream-output-later stream))) ; something buffered.
(progn
(output-later stream base start end reuse-sap)
;; ### check to see if any of this noise can be output
)
(let ((length (- end start)))
(multiple-value-bind
(count errno)
(mach:unix-write (fd-stream-fd stream) base start length)
(cond ((not count)
(if (= errno mach:ewouldblock)
(output-later stream base start end reuse-sap)
(error "While writing ~S: ~A"
stream (mach:get-unix-error-msg errno))))
((not (eql count length))
(output-later stream base (+ start count) end reuse-sap)))))))
;;; FLUSH-OUTPUT-BUFFER -- internal
;;;
;;; Flush any data in the output buffer.
;;;
(defun flush-output-buffer (stream)
(let ((length (fd-stream-obuf-tail stream)))
(unless (= length 0)
(do-output stream (fd-stream-obuf-sap stream) 0 length t)
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(setf (fd-stream-obuf-tail stream) 0))))
;;; DEF-OUTPUT-ROUTINES -- internal
;;;
;;; Define output routines that output numbers size bytes long for the
;;; given bufferings. Use body to do the actual output.
;;;
(defmacro def-output-routines ((name size &rest bufferings) &body body)
(cons 'progn
(mapcar
#'(lambda (buffering)
(let ((function
(intern (let ((*print-case* :upcase))
(format nil name (car buffering))))))
`(progn
(defun ,function (stream byte)
,(unless (eq (car buffering) :none)
`(when (< (fd-stream-obuf-length stream)
(+ (fd-stream-obuf-tail stream)
,size))
(flush-output-buffer stream)))
,@body
(incf (fd-stream-obuf-tail stream) ,size)
,(ecase (car buffering)
(:none
`(flush-output-buffer stream))
(:line
`(when (eq (char-code byte) (char-code #\Newline))
(flush-output-buffer stream)))
(:full
))
(values))
(setf *output-routines*
(nconc *output-routines*
',(mapcar
#'(lambda (type)
(list type
(car buffering)
function
size))
(cdr buffering)))))))
bufferings)))
(def-output-routines ("OUTPUT-CHAR-~A-BUFFERED"
1
(:none character)
(:line character)
(:full character))
(if (eq (char-code byte)
(char-code #\Newline))
(setf (fd-stream-char-pos stream) 0)
(incf (fd-stream-char-pos stream)))
(setf (sap-ref-8 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
(char-code byte)))
(:none (signed-byte 8) (unsigned-byte 8))
(:full (signed-byte 8) (unsigned-byte 8)))
(when (characterp byte)
(if (eq (char-code byte)
(char-code #\Newline))
(setf (fd-stream-char-pos stream) 0)
(incf (fd-stream-char-pos stream))))
(setf (sap-ref-8 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
byte))
(def-output-routines ("OUTPUT-SHORT-~A-BUFFERED"
2
(:none (signed-byte 16) (unsigned-byte 16))
(:full (signed-byte 16) (unsigned-byte 16)))
(setf (sap-ref-16 (fd-stream-obuf-sap stream)
(truncate (fd-stream-obuf-tail stream) 2))
byte))
(def-output-routines ("OUTPUT-LONG-~A-BUFFERED"
(:none (signed-byte 32) (unsigned-byte 32))
(:full (signed-byte 32) (unsigned-byte 32)))
(setf (sap-ref-32 (fd-stream-obuf-sap stream)
(truncate (fd-stream-obuf-tail stream) 4))
byte))
;;; OUTPUT-RAW-BYTES -- public
;;;
;;; Does the actual output. If there is space to buffer the string, buffer
;;; it. If the string would normally fit in the buffer, but doesn't because
;;; of other stuff in the buffer, flush the old noise out of the buffer and
;;; put the string in it. Otherwise we have a very long string, so just
;;; send it directly (after flushing the buffer, of course).
;;;
(defun output-raw-bytes (stream thing &optional start end)
"Output THING to stream. THING can be any kind of vector or a sap. If THING
is a SAP, END must be supplied (as length won't work)."
(let ((start (or start 0))
(end (or end (length (the (simple-array * (*)) thing)))))
(declare (type index start end))
(let* ((len (fd-stream-obuf-length stream))
(tail (fd-stream-obuf-tail stream))
(space (- len tail))
(bytes (- end start))
(newtail (+ tail bytes)))
(cond ((minusp bytes) ; Error case
(cerror "Just go on as if nothing happened..."
"~S called with :END before :START!"
'output-raw-bytes))
((zerop bytes)) ; Easy case
((<= bytes space)
(if (system-area-pointer-p thing)
(system-area-copy thing
(* start vm:byte-bits)
(fd-stream-obuf-sap stream)
(* tail vm:byte-bits)
(* bytes vm:byte-bits))
(copy-to-system-area thing
(+ (* start vm:byte-bits)
(* vm:vector-data-offset vm:word-bits))
(fd-stream-obuf-sap stream)
(* tail vm:byte-bits)
(* bytes vm:byte-bits)))
(setf (fd-stream-obuf-tail stream) newtail))
((<= bytes len)
(flush-output-buffer stream)
(if (system-area-pointer-p thing)
(system-area-copy thing
(* start vm:byte-bits)
(fd-stream-obuf-sap stream)
0
(* bytes vm:byte-bits))
(copy-to-system-area thing
(+ (* start vm:byte-bits)
(* vm:vector-data-offset vm:word-bits))
(fd-stream-obuf-sap stream)
0
(* bytes vm:byte-bits)))
(setf (fd-stream-obuf-tail stream) bytes))
(t
(flush-output-buffer stream)
(do-output stream thing start end nil))))))
;;; FD-SOUT -- internal
;;;
;;; Routine to use to output a string. If the stream is unbuffered, slam
;;; the string down the file descriptor, otherwise use OUTPUT-RAW-BYTES to
;;; buffer the string. Update charpos by checking to see where the last newline
;;; was.
;;;
;;; Note: some bozos (the FASL dumper) call write-string with things other
;;; than strings. Therefore, we must make sure we have a string before calling
;;; position on it.
;;;
(defun fd-sout (stream thing start end)
(let ((start (or start 0))
(end (or end (length (the vector thing)))))
(let ((last-newline (and (find #\newline (the simple-string thing)
:start start :end end)
(position #\newline (the simple-string thing)
:from-end t
:start start
:end end))))
(ecase (fd-stream-buffering stream)
(:full
(output-raw-bytes stream thing start end))
(:line
(output-raw-bytes stream thing start end)
(when last-newline
(flush-output-buffer stream)))
(:none
(do-output stream thing start end nil)))
(if last-newline
(setf (fd-stream-char-pos stream)
(- end last-newline 1))
(incf (fd-stream-char-pos stream)
(- end start))))
(do-output stream thing start end nil))))))
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;;; PICK-OUTPUT-ROUTINE -- internal
;;;
;;; Find an output routine to use given the type and buffering. Return as
;;; multiple values the routine, the real type transfered, and the number of
;;; bytes per element.
;;;
(defun pick-output-routine (type buffering)
(dolist (entry *output-routines*)
(when (and (subtypep type (car entry))
(eq buffering (cadr entry)))
(return (values (symbol-function (caddr entry))
(car entry)
(cadddr entry))))))
;;;; Input routines and related noise.
(defvar *input-routines* ()
"List of all available input routines. Each element is a list of the
element-type input, the function name, and the number of bytes per element.")
;;; DO-INPUT -- internal
;;;
;;; Fills the input buffer, and returns the first character. Throws to
;;; eof-input-catcher if the eof was reached. Drops into system:server if
;;; necessary.
;;;
(defun do-input (stream)
(let ((fd (fd-stream-fd stream))
(ibuf-sap (fd-stream-ibuf-sap stream))
(buflen (fd-stream-ibuf-length stream))
(head (fd-stream-ibuf-head stream))
(tail (fd-stream-ibuf-tail stream)))
(declare (type index head tail))
(setf head 0)
(setf tail 0)
(setf (fd-stream-ibuf-head stream) 0)
(setf (fd-stream-ibuf-tail stream) 0))
(t
(decf tail head)
(system-area-copy ibuf-sap (* head vm:byte-bits)
ibuf-sap 0 (* tail vm:byte-bits))
(setf head 0)
(setf (fd-stream-ibuf-head stream) 0)
(setf (fd-stream-ibuf-tail stream) tail))))
(setf (fd-stream-listen stream) nil)
(multiple-value-bind
(count errno)
(mach:unix-select (1+ fd) (ash 1 fd) 0 0 0)
(case count
(1)
(0
(unless (system:wait-until-fd-usable
fd :input (fd-stream-timeout stream))
(error 'io-timeout :stream stream :direction :read)))
(t
(error "Problem checking to see if ~S is readable: ~A"
stream
(mach:get-unix-error-msg errno)))))
(multiple-value-bind
(count errno)
(mach:unix-read fd
(system:int-sap (+ (system:sap-int ibuf-sap) tail))
(- buflen tail))
(cond ((null count)
(if #+serve-event (eql errno mach:ewouldblock)
#-serve-event nil
(unless (system:wait-until-fd-usable
fd :input (fd-stream-timeout stream))
(error 'io-timeout :stream stream :direction :read))
(do-input stream))
(error "Error reading ~S: ~A"
stream
(mach:get-unix-error-msg errno))))
((zerop count)
(setf (fd-stream-listen stream) :eof)
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(throw 'eof-input-catcher nil))
(t
(incf (fd-stream-ibuf-tail stream) count))))))
;;; INPUT-AT-LEAST -- internal
;;;
;;; Makes sure there are at least ``bytes'' number of bytes in the input
;;; buffer. Keeps calling do-input until that condition is met.
;;;
(defmacro input-at-least (stream bytes)
(let ((stream-var (gensym))
(bytes-var (gensym)))
`(let ((,stream-var ,stream)
(,bytes-var ,bytes))
(loop
(when (>= (- (fd-stream-ibuf-tail ,stream-var)
(fd-stream-ibuf-head ,stream-var))
,bytes-var)
(return))
(do-input ,stream-var)))))
;;; INPUT-WRAPPER -- intenal
;;;
;;; Macro to wrap around all input routines to handle eof-error noise. This
;;; should make provisions for filling stream-in-buffer.
;;;
(defmacro input-wrapper ((stream bytes eof-error eof-value) &body read-forms)
(let ((stream-var (gensym))
(element-var (gensym)))
`(let ((,stream-var ,stream))
(if (fd-stream-unread ,stream)
(prog1
(fd-stream-unread ,stream)
(setf (fd-stream-unread ,stream) nil)
(setf (fd-stream-listen ,stream) nil))
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(let ((,element-var
(catch 'eof-input-catcher
(input-at-least ,stream-var ,bytes)
,@read-forms)))
(cond (,element-var
(incf (fd-stream-ibuf-head ,stream-var) ,bytes)
,element-var)
(,eof-error
(error "EOF while reading ~S" stream))
(t
,eof-value)))))))
;;; DEF-INPUT-ROUTINE -- internal
;;;
;;; Defines an input routine.
;;;
(defmacro def-input-routine (name
(type size sap head)
&rest body)
`(progn
(defun ,name (stream eof-error eof-value)
(input-wrapper (stream ,size eof-error eof-value)
(let ((,sap (fd-stream-ibuf-sap stream))
(,head (fd-stream-ibuf-head stream)))
,@body)))
(setf *input-routines*
(nconc *input-routines*
(list (list ',type ',name ',size))))))
;;; INPUT-CHARACTER -- internal
;;;
;;; Routine to use in stream-in slot for reading string chars.
;;;
(def-input-routine input-character
(character 1 sap head)
(code-char (sap-ref-8 sap head)))
;;; INPUT-UNSIGNED-8BIT-BYTE -- internal
;;;
;;; Routine to read in an unsigned 8 bit number.
;;;
(def-input-routine input-unsigned-8bit-byte
((unsigned-byte 8) 1 sap head)
;;; INPUT-SIGNED-8BIT-BYTE -- internal
;;;
;;; Routine to read in a signed 8 bit number.
;;;
(def-input-routine input-signed-8bit-number
((signed-byte 8) 1 sap head)
;;; INPUT-UNSIGNED-16BIT-BYTE -- internal
;;;
;;; Routine to read in an unsigned 16 bit number.
;;;
(def-input-routine input-unsigned-16bit-byte
((unsigned-byte 16) 2 sap head)
(sap-ref-16 sap (truncate head 2)))
;;; INPUT-SIGNED-16BIT-BYTE -- internal
;;;
;;; Routine to read in a signed 16 bit number.
;;;
(def-input-routine input-signed-16bit-byte
((signed-byte 16) 2 sap head)
(signed-sap-ref-16 sap (truncate head 2)))
;;; INPUT-UNSIGNED-32BIT-BYTE -- internal
;;;
;;; Routine to read in a unsigned 32 bit number.
;;;
(def-input-routine input-unsigned-32bit-byte
((unsigned-byte 32) 4 sap head)
(sap-ref-32 sap (truncate head 4)))
;;; INPUT-SIGNED-32BIT-BYTE -- internal
;;;
;;; Routine to read in a signed 32 bit number.
;;;
(def-input-routine input-signed-32bit-byte
((signed-byte 32) 4 sap head)
(signed-sap-ref-32 sap (truncate head 2)))
;;; PICK-INPUT-ROUTINE -- internal
;;;
;;; Find an input routine to use given the type. Return as multiple values
;;; the routine, the real type transfered, and the number of bytes per element.
;;;
(defun pick-input-routine (type)
(dolist (entry *input-routines*)
(when (subtypep type (car entry))
(return (values (symbol-function (cadr entry))
(car entry)
(caddr entry))))))
;;; STRING-FROM-SAP -- internal
;;;
;;; Returns a string constructed from the sap, start, and end.
;;;
(defun string-from-sap (sap start end)
(declare (type index start end))
(copy-from-system-area sap (* start vm:byte-bits)
string (* vm:vector-data-offset vm:word-bits)
(* length vm:byte-bits))
string))
;;; FD-STREAM-READ-LINE -- internal
;;;
;;; Reads a line, returning a simple string. Note: this relies on the fact
;;; that the input buffer does not change during do-input.
;;;
(defun fd-stream-read-line (stream eof-error-p eof-value)
(let ((eof t))
(values
(or (let ((sap (fd-stream-ibuf-sap stream))
(results (when (fd-stream-unread stream)
(prog1
(list (string (fd-stream-unread stream)))
(setf (fd-stream-unread stream) nil)
(setf (fd-stream-listen stream) nil)))))
(catch 'eof-input-catcher
(loop
(input-at-least stream 1)
(let* ((head (fd-stream-ibuf-head stream))
(tail (fd-stream-ibuf-tail stream))
(newline (do ((index head (1+ index)))
((= index tail) nil)
(when (= (sap-ref-8 sap index)
(char-code #\newline))
(return index))))
(end (or newline tail)))
(push (string-from-sap sap head end)
results)
(when newline
(setf eof nil)
(setf (fd-stream-ibuf-head stream)
(1+ newline))
(return))
(setf (fd-stream-ibuf-head stream) end))))
(cond ((null results)
nil)
((null (cdr results))
(car results))
(t
(apply #'concatenate 'simple-string (nreverse results)))))
(if eof-error-p
(error "EOF while reading ~S" stream)
eof-value))
#|
This version waits using server. I changed to the non-server version because
it allows this method to be used by CLX w/o confusing serve-event. The
non-server method is also significantly more efficient for large reads.
-- Ram
;;; FD-STREAM-READ-N-BYTES -- internal
;;;
;;; The n-bin routine.
;;;
(defun fd-stream-read-n-bytes (stream buffer start requested eof-error-p)
(let* ((sap (fd-stream-ibuf-sap stream))
(elsize (fd-stream-element-size stream))
(offset (* elsize start))
(bytes (* elsize requested))
(result
(catch 'eof-input-catcher
(loop
(input-at-least stream 1)
(let* ((head (fd-stream-ibuf-head stream))
(tail (fd-stream-ibuf-tail stream))
(available (- tail head))
(copy (min available bytes)))
(if (typep buffer 'system-area-pointer)
(system-area-copy sap (* head vm:byte-bits)
buffer (* offset vm:byte-bits)
(* copy vm:byte-bits))
(copy-from-system-area sap (* head vm:byte-bits)
buffer (+ (* offset vm:byte-bits)
(* vm:vector-data-offset
vm:word-bits))
(* copy vm:byte-bits)))
(incf (fd-stream-ibuf-head stream) copy)
(incf offset copy)
(decf bytes copy))
(when (zerop bytes)
(return requested))))))
(cond (result)
((not eof-error-p)
(- requested (/ bytes elsize)))
(t
(error "Hit eof on ~S after reading ~D ~D~2:*-bit byte~P~*, ~
but ~D~2:* ~D-bit byte~P~:* ~[were~;was~:;were~] requested."
stream
(- requested (/ bytes elsize))
(* elsize 8)
requested)))))
|#
;;; FD-STREAM-READ-N-BYTES -- internal
;;;
;;; The N-Bin method for FD-STREAMs. This doesn't using SERVER; it blocks
;;; in UNIX-READ. This allows the method to be used to implementing reading
;;; for CLX. It is generally used where there is a definite amount of reading
;;; to be done, so blocking isn't too problematical.
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;;;
;;; We copy buffered data into the buffer. If there is enough, just return.
;;; Otherwise, we see if the amount of additional data needed will fit in the
;;; stream buffer. If not, inhibit GCing (so we can have a SAP into the Buffer
;;; argument), and read directly into the user supplied buffer. Otherwise,
;;; read a buffer-full into the stream buffer and then copy the amount we need
;;; out.
;;;
;;; We loop doing the reads until we either get enough bytes or hit EOF. We
;;; must loop because some streams (like pipes) may return a partial amount
;;; without hitting EOF.
;;;
(defun fd-stream-read-n-bytes (stream buffer start requested eof-error-p)
(declare (type stream stream) (type index start requested))
(let* ((sap (fd-stream-ibuf-sap stream))
(elsize (fd-stream-element-size stream))
(offset (* elsize start))
(requested-bytes (* elsize requested))
(head (fd-stream-ibuf-head stream))
(tail (fd-stream-ibuf-tail stream))
(available (- tail head))
(copy (min requested-bytes available)))
(declare (type index elsize offset requested-bytes head tail available
copy))
(unless (zerop copy)
(if (typep buffer 'system-area-pointer)
(system-area-copy sap (* head vm:byte-bits)
buffer (* offset vm:byte-bits)
(* copy vm:byte-bits))
(copy-from-system-area sap (* head vm:byte-bits)
buffer (+ (* offset vm:byte-bits)
(* vm:vector-data-offset
vm:word-bits))
(* copy vm:byte-bits)))
(incf (fd-stream-ibuf-head stream) copy))
(cond
((> requested-bytes available)
(setf (fd-stream-ibuf-head stream) 0)
(setf (fd-stream-ibuf-tail stream) 0)
(setf (fd-stream-listen stream) nil)
(let ((now-needed (- requested-bytes copy))
(len (fd-stream-ibuf-length stream)))
(declare (type index now-needed len))
(cond
((> now-needed len)
(system:without-gcing
(loop
(multiple-value-bind
(count err)
(mach:unix-read (fd-stream-fd stream)
(sap+ (if (typep buffer 'system-area-pointer)
buffer
(vector-sap buffer))
(+ offset copy))
now-needed)
(declare (type (or index null) count))
(unless count
(error "Error reading ~S: ~A" stream
(mach:get-unix-error-msg err)))
(when (zerop count)
(if eof-error-p
(error "Unexpected eof on ~S." stream)
(return (- requested (truncate now-needed elsize)))))
(decf now-needed count)
(when (zerop now-needed) (return requested))
(incf offset count)))))
(t
(loop
(multiple-value-bind
(count err)
(mach:unix-read (fd-stream-fd stream) sap len)
(declare (type (or index null) count))
(unless count
(error "Error reading ~S: ~A" stream
(mach:get-unix-error-msg err)))
(incf (fd-stream-ibuf-tail stream) count)
(when (zerop count)
(if eof-error-p
(error "Unexpected eof on ~S." stream)
(return (- requested (truncate now-needed elsize)))))
(let* ((copy (min now-needed count))
(copy-bits (* copy vm:byte-bits))
(buffer-start-bits
(* (+ offset available) vm:byte-bits)))
(declare (type index copy copy-bits buffer-start-bits))
(if (typep buffer 'system-area-pointer)
(system-area-copy sap 0
buffer buffer-start-bits
copy-bits)
(copy-from-system-area sap 0
buffer (+ buffer-start-bits
(* vm:vector-data-offset
vm:word-bits))
copy-bits))
(incf (fd-stream-ibuf-head stream) copy)
(decf now-needed copy)
(when (zerop now-needed) (return requested))
(incf offset copy))))))))
(t
requested))))
;;;; Utility functions (misc routines, etc)
;;; SET-ROUTINES -- internal
;;;
;;; Fill in the various routine slots for the given type. Input-p and output-p
;;; indicate what slots to fill. The buffering slot must be set prior to
;;; calling this routine.
;;;
(defun set-routines (stream type input-p output-p)
(let ((target-type (case type
((:default unsigned-byte)
'(unsigned-byte 8))
(signed-byte
'(signed-byte 8))
(t
type)))
(input-type nil)
(output-type nil)
(input-size nil)
(output-size nil))
(when (fd-stream-obuf-sap stream)
(push (fd-stream-obuf-sap stream) *available-buffers*)
(setf (fd-stream-obuf-sap stream) nil))
(when (fd-stream-ibuf-sap stream)
(push (fd-stream-ibuf-sap stream) *available-buffers*)
(setf (fd-stream-ibuf-sap stream) nil))
(when input-p
(multiple-value-bind
(routine type size)
(pick-input-routine target-type)
(unless routine
(error "Could not find any input routine for ~S" target-type))
(setf (fd-stream-ibuf-sap stream) (next-available-buffer))
(setf (fd-stream-ibuf-length stream) bytes-per-buffer)
(setf (fd-stream-ibuf-tail stream) 0)
(setf (fd-stream-in stream) routine
(fd-stream-bin stream) #'ill-bin
(fd-stream-n-bin stream) #'ill-bin)
(setf (fd-stream-in stream) #'ill-in
(fd-stream-bin stream) routine
(fd-stream-n-bin stream) #'fd-stream-read-n-bytes))
(setf input-size size)
(setf input-type type)))
(when output-p
(multiple-value-bind
(routine type size)
(pick-output-routine target-type (fd-stream-buffering stream))
(unless routine
(error "Could not find any output routine for ~S buffered ~S."
(fd-stream-buffering stream)
target-type))
(setf (fd-stream-obuf-sap stream) (next-available-buffer))
(setf (fd-stream-obuf-length stream) bytes-per-buffer)
(setf (fd-stream-obuf-tail stream) 0)
(if (subtypep type 'character)
(setf (fd-stream-out stream) routine
(fd-stream-bout stream) #'ill-bout)
(setf (fd-stream-out stream)
(or (if (eql size 1)
(pick-output-routine 'base-character
(fd-stream-buffering stream)))
#'ill-out)
(fd-stream-bout stream) routine))
(setf (fd-stream-sout stream)
(if (eql size 1) #'fd-sout #'ill-out))
(setf (fd-stream-char-pos stream) 0)
(setf output-size size)
(setf output-type type)))
(when (and input-size output-size
(not (eq input-size output-size)))
(error "Element sizes for input (~S:~S) and output (~S:~S) differ?"
input-type input-size
output-type output-size))
(setf (fd-stream-element-size stream)
(or input-size output-size))
(setf (fd-stream-element-type stream)
(cond ((equal input-type output-type)
input-type)
((or (null output-type) (subtypep input-type output-type))
input-type)
((subtypep output-type input-type)
output-type)
(t
(error "Input type (~S) and output type (~S) are unrelated?"
input-type
output-type))))))
;;; FD-STREAM-MISC-ROUTINE -- input
;;;
;;; Handle the various misc operations on fd-stream.
;;;
(defun fd-stream-misc-routine (stream operation &optional arg1 arg2)
(case operation
(:read-line
(fd-stream-read-line stream arg1 arg2))
(:listen
(or (not (eql (fd-stream-ibuf-head stream)
(fd-stream-ibuf-tail stream)))
(fd-stream-listen stream)
(setf (fd-stream-listen stream)
(eql (mach:unix-select (1+ (fd-stream-fd stream))
(ash 1 (fd-stream-fd stream))
0
0
0)
1))))
(setf (fd-stream-unread stream) arg1)
(setf (fd-stream-listen stream) t))
(:close
(cond (arg1
;; We got us an abort on our hands.
(when (and (fd-stream-file stream)
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;; Can't do anything unless we know what file were dealing with,
;; and we don't want to do anything strange unless we were
;; writing to the file.
(if (fd-stream-original stream)
;; Have an handle on the original, just revert.
(multiple-value-bind
(okay err)
(mach:unix-rename (fd-stream-original stream)
(fd-stream-file stream))
(unless okay
(cerror "Go on as if nothing bad happened."
"Could not restore ~S to it's original contents: ~A"
(fd-stream-file stream)
(mach:get-unix-error-msg err))))
;; Can't restore the orignal, so nuke that puppy.
(multiple-value-bind
(okay err)
(mach:unix-unlink (fd-stream-file stream))
(unless okay
(cerror "Go on as if nothing bad happened."
"Could not remove ~S: ~A"
(fd-stream-file stream)
(mach:get-unix-error-msg err)))))))
(t
(fd-stream-misc-routine stream :finish-output)
(when (and (fd-stream-original stream)
(fd-stream-delete-original stream))
(multiple-value-bind
(okay err)
(mach:unix-unlink (fd-stream-original stream))
(unless okay
(cerror "Go on as if nothing bad happened."
"Could not delete ~S during close of ~S: ~A"
(fd-stream-original stream)
stream
(mach:get-unix-error-msg err)))))))
(mach:unix-close (fd-stream-fd stream))
(when (fd-stream-obuf-sap stream)
(push (fd-stream-obuf-sap stream) *available-buffers*)
(setf (fd-stream-obuf-sap stream) nil))
(when (fd-stream-ibuf-sap stream)
(push (fd-stream-ibuf-sap stream) *available-buffers*)
(setf (fd-stream-ibuf-sap stream) nil))
(:clear-input
(setf (fd-stream-ibuf-head stream) 0)
(setf (fd-stream-ibuf-tail stream) 0)
(loop
(let ((count (mach:unix-select (1+ (fd-stream-fd stream))
(ash 1 (fd-stream-fd stream))
0 0 0)))