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;;; -*- Log: code.log; Package: LISP -*-
;;; **********************************************************************
;;; This code was written as part of the Spice 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 Spice Lisp, please contact
;;; Scott Fahlman (FAHLMAN@CMUC).
;;; **********************************************************************
;;;
;;; Streams for UNIX file descriptors.
;;;
;;; Written by William Lott, July 1989 - January 1990.
;;;
;;; **********************************************************************
(in-package "SYSTEM")
(export '(fd-stream fd-stream-p fd-stream-fd make-fd-stream
beep *beep-function*
output-raw-bytes
*tty* *stdin* *stdout* *stderr*))
(in-package "EXTENSIONS")
(export '(*backup-extension*))
(in-package "LISP")
(defmacro byte-blt (src-string src-start dst-string dst-start dst-end)
"Move the bytes from src-string to dst-string."
`(system:%primitive byte-blt
,src-string
,src-start
,dst-string
,dst-start
,dst-end))
;;;; Buffer manipulation routines.
(defvar *available-buffers* ()
"List of available buffers. Each buffer is an dynamic alien.")
(defconstant bytes-per-buffer (* 4 1024)
"Number of bytes per buffer.")
;;; NEXT-AVAILABLE-BUFFER -- Internal.
;;;
;;; Returns the next available alien buffer, creating one if necessary.
;;;
(proclaim '(inline next-available-buffer))
;;;
(defun next-available-buffer ()
(if *available-buffers*
(pop *available-buffers*)
(system:make-alien 'alien (* bytes-per-buffer 8))))
;;;; 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
(element-size 1) ; Number of bytes per element.
(element-type 'string-char) ; The type of element being transfered.
(fd -1 :type fixnum) ; The file descriptor
(buffering :full) ; One of :none, :line, or :full
(char-pos nil) ; Character position if known.
(listen nil) ; T if we don't need to listen
;; The input buffer.
(unread nil)
(ibuf nil)
(ibuf-sap nil)
(ibuf-length nil)
(ibuf-head 0 :type fixnum)
(ibuf-tail 0 :type fixnum)
;; The output buffer.
(obuf nil)
(obuf-sap nil)
(obuf-length nil)
(obuf-tail 0 :type fixnum)
;; Output flushed, but not written due to non-blocking io.
(output-later nil)
(handler nil))
(defun %print-fd-stream (fd-stream stream depth)
(declare (ignore depth))
(format stream "#<Stream for ~A>"
(fd-stream-name fd-stream)))
;;;; 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))
(buffer (cadddr stuff))
(length (- end start)))
(multiple-value-bind
(count errno)
(mach:unix-write (fd-stream-fd stream)
base
start
length)
(cond ((eql count length) ; Hot damn, it workded.
(when buffer
(push buffer *available-buffers*)))
((not (null count)) ; Sorta worked.
(push (list base
(+ start count)
end
buffer)
(fd-stream-output-later stream)))
((= errno mach:ewouldblock)
(error "Write would have blocked, but SERVER told us to go."))
(t
(error "While writing ~S: ~A"
stream
(mach:get-unix-error-msg errno))))))
(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 buffer)
(cond ((null (fd-stream-output-later stream))
(setf (fd-stream-output-later stream)
(list (list base start end buffer)))
(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 buffer)))))
(when buffer
(let ((new-buffer (next-available-buffer)))
(setf (fd-stream-obuf stream) new-buffer)
(setf (fd-stream-obuf-sap stream)
(system:alien-sap new-buffer))
(setf (fd-stream-obuf-length stream)
(/ (system:alien-size new-buffer) 8)))))
;;; 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 buffer)
(if (not (null (fd-stream-output-later stream))) ; something buffered.
(progn
(output-later stream base start end buffer)
;; XXX 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 ((eql count length)) ; Hot damn, it worked.
((not (null count))
(output-later stream base (+ start count) end buffer))
((= errno mach:ewouldblock)
(output-later stream base start end buffer))
(t
(error "While writing ~S: ~A"
stream
(mach:get-unix-error-msg errno))))))))
;;; 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
(fd-stream-obuf stream))
(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-BYTE-~A-BUFFERED"
1
(:none (signed-byte 8) (unsigned-byte 8) string-char)
(:line string-char)
(:full (signed-byte 8) (unsigned-byte 8) string-char))
(when (characterp byte)
(if (eq (char-code byte)
(char-code #\Newline))
(setf (fd-stream-char-pos stream) 0)
(incf (fd-stream-char-pos stream))))
(system:%primitive 8bit-system-set
(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)))
(system:%primitive 16bit-system-set
(fd-stream-obuf-sap stream)
(/ (fd-stream-obuf-tail stream) 2)
byte))
(def-output-routines ("OUTPUT-SIGNED-LONG-~A-BUFFERED"
4
(:none (signed-byte 32))
(:full (signed-byte 32)))
(system:%primitive signed-32bit-system-set
(fd-stream-obuf-sap stream)
(/ (fd-stream-obuf-tail stream) 2)
byte))
; XXX What? no unsigned-32bit-system-set?
(def-output-routines ("OUTPUT-UNSIGNED-LONG-~A-BUFFERED"
4
(:none (unsigned-byte 31))
(:full (unsigned-byte 31)))
(system:%primitive signed-32bit-system-set
(fd-stream-obuf-sap stream)
(/ (fd-stream-obuf-tail stream) 2)
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 thing))))
(declare (fixnum 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)
(byte-blt thing start (fd-stream-obuf-sap stream) tail newtail)
(setf (fd-stream-obuf-tail stream) newtail))
((<= bytes len)
(flush-output-buffer stream)
(byte-blt thing start (fd-stream-obuf-sap stream) 0 bytes)
(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 thing))))
(declare (fixnum start end))
(if (stringp 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))))
(ecase (fd-stream-buffering stream)
((:line :full)
(output-raw-bytes stream thing start end))
(:none
(do-output stream thing start end nil))))))
;;; 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)))
(unless (zerop head)
(cond ((eq 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)
(byte-blt ibuf-sap head ibuf-sap 0 tail)
(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
(system:wait-until-fd-usable fd :input))
(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 (eql errno mach:ewouldblock)
(progn
(system:wait-until-fd-usable fd :input)
(do-input stream))
(error "Error reading ~S: ~A"
stream
(mach:get-unix-error-msg errno))))
((zerop count)
(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))
(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-STRING-CHAR -- internal
;;;
;;; Routine to use in stream-in slot for reading string chars.
;;;
(def-input-routine input-string-char
(string-char 1 sap head)
(code-char (system:%primitive 8bit-system-ref sap head)))
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;;; 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)
(system:%primitive 8bit-system-ref 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)
(let ((byte (system:%primitive 8bit-system-ref sap head)))
(if (logand byte #x80)
(- byte #x100)
byte)))
;;; 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)
(system:%primitive 16bit-system-ref
sap
(/ 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)
(system:%primitive signed-16bit-system-ref
sap
(/ 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)
(system:%primitive unsigned-32bit-system-ref
sap
(/ head 2)))
;;; 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)
(system:%primitive signed-32bit-system-ref
sap
(/ 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)
(let* ((length (- end start))
(string (make-string length)))
(byte-blt sap start string 0 length)
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 (if (fd-stream-unread stream)
(prog1
(list (string (fd-stream-unread stream)))
(setf (fd-stream-unread 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 (system:%primitive find-character
sap
head
tail
#\Newline))
(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))
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eof)))
;;; 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)))
(byte-blt sap head buffer offset (+ offset copy))
(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)))))
;;;; 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 stream)
(push (fd-stream-obuf stream) *available-buffers*)
(setf (fd-stream-obuf stream) nil))
(when (fd-stream-ibuf stream)
(push (fd-stream-ibuf stream) *available-buffers*)
(setf (fd-stream-ibuf 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 stream)
(next-available-buffer))
(setf (fd-stream-ibuf-sap stream)
(system:alien-sap (fd-stream-ibuf stream)))
(setf (fd-stream-ibuf-length stream)
(/ (system:alien-size (fd-stream-ibuf stream)) 8))
(setf (fd-stream-ibuf-tail stream)
0)
(if (subtypep type 'character)
(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 stream) (next-available-buffer))
(setf (fd-stream-obuf-sap stream)
(system:alien-sap (fd-stream-obuf stream)))
(setf (fd-stream-obuf-length stream)
(/ (system:alien-size (fd-stream-obuf stream)) 8))
(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 'string-char
(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)
((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)
(not (zerop (mach:unix-select (1+ (fd-stream-fd stream))
(ash 1 (fd-stream-fd stream))
0
0
0))))))
(:unread
(setf (fd-stream-unread stream) arg1))
(:close
(cond (arg1
;; We got us an abort on our hands.
(when (and (fd-stream-file stream)
(fd-stream-obuf stream))
;; 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 stream)
(push (fd-stream-obuf stream) *available-buffers*)
(setf (fd-stream-obuf stream) nil))
(when (fd-stream-ibuf stream)
(push (fd-stream-ibuf stream) *available-buffers*)
(setf (fd-stream-ibuf stream) nil))
(lisp::set-closed-flame stream))
(:clear-input)
(:force-output
(flush-output-buffer stream))
(:finish-output
(flush-output-buffer stream)
(do ()
((null (fd-stream-output-later stream)))
(system:serve-all-events)))
(:element-type
(fd-stream-element-type stream))
(:line-length
80)
(:charpos
(fd-stream-char-pos stream))
(:file-length
(multiple-value-bind
(okay dev ino mode nlink uid gid rdev size
atime mtime ctime blksize blocks)
(mach:unix-fstat (fd-stream-fd stream))
(declare (ignore ino nlink uid gid rdev
atime mtime ctime blksize blocks))
(unless okay
(error "Error fstating ~S: ~A"
stream
(mach:get-unix-error-msg dev)))
(if (zerop mode)
nil
(/ size (fd-stream-element-size stream)))))
(:file-position
(fd-stream-file-position stream arg1))
(:file-name
(fd-stream-file stream))))
;;; FD-STREAM-FILE-POSITION -- internal.
;;;
(defun fd-stream-file-position (stream &optional newpos)
(if (null newpos)
(system:without-interrupts
;; First, find the position of the UNIX file descriptor in the
;; file.
(multiple-value-bind
(posn errno)
(mach:unix-lseek (fd-stream-fd stream) 0 mach:l_incr)
(cond ((numberp posn)
;; Adjust for buffered output:
;; If there is any output buffered, the *real* file position
;; will be larger than reported by lseek because lseek
;; obviously cannot take into account output we have not
;; sent yet.
(dolist (later (fd-stream-output-later stream))
(incf posn (- (caddr later) (cadr later))))
(incf posn (fd-stream-obuf-tail stream))
;; Adjust for unread input:
;; If there is any input read from UNIX but not supplied to
;; the user of the stream, the *real* file position will
;; smaller than reported, because we want to look like the
;; unread stuff is still available.
(decf posn (- (fd-stream-ibuf-tail stream)
(fd-stream-ibuf-head stream)))
(when (fd-stream-unread stream)
(decf posn))
;; Divide bytes by element size.
(/ posn (fd-stream-element-size stream)))
((eq errno mach:espipe)
nil)
(t
(system:with-interrupts
(error "Error lseek'ing ~S: ~A"
stream
(mach:get-unix-error-msg errno)))))))
(let (offset origin)
;; Make sure we don't have any output pending, because if we move the
;; file pointer before writing this stuff, it will be written in the
;; wrong location.
(flush-output-buffer stream)
(do ()
((null (fd-stream-output-later stream)))
(system:serve-all-events))
;; Clear out any pending input to force the next read to go to the
;; disk.
(setf (fd-stream-unread stream) nil)
(setf (fd-stream-ibuf-head stream) 0)
(setf (fd-stream-ibuf-tail stream) 0)
;; Now move it.
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(cond ((eq newpos :start)
(setf offset 0 origin mach:l_set))
((eq newpos :end)
(setf offset 0 origin mach:l_xtnd))
((numberp newpos)
(setf offset (* newpos (fd-stream-element-size stream))
origin mach:l_set))
(t
(error "Invalid position given to file-position: ~S" newpos)))
(multiple-value-bind
(posn errno)
(mach:unix-lseek (fd-stream-fd stream) offset origin)
(cond ((numberp posn)
t)
((eq errno mach:espipe)
nil)
(t
(error "Error lseek'ing ~S: ~A"
stream
(mach:get-unix-error-msg errno))))))))
;;;; Creation routines (MAKE-FD-STREAM and OPEN)
;;; MAKE-FD-STREAM -- Public.
;;;
;;; Returns a FD-STREAM on the given file.
;;;
(defun make-fd-stream (fd
&key
(input nil input-p)
(output nil output-p)
(element-type 'string-char)
(buffering :full)
file
original
delete-original
(name (if file
(format nil "file ~S" file)
(format nil "descriptor ~D" fd))))
"Create a stream for the given unix file descriptor. If input is non-nil,
allow input operations. If output is non-nil, allow output operations. If
neither input nor output are specified, default to allowing input.
element-type indicates the element type to use (as for open). Buffering
indicates the kind of buffering to use (one of :none, :line, or :full). If
file is spesified, it should be the name of the file. Name is used to
identify the stream when printed."
(cond ((not (or input-p output-p))
(setf input t))
((not (or input output))
(error "File descriptor must be opened either for input or output.")))
(let ((stream (%make-fd-stream :fd fd
:name name
:file file
:original original
:delete-original delete-original
:buffering buffering)))
(set-routines stream element-type input output)
stream))
;;; PICK-PACKUP-NAME -- internal
;;;
;;; Pick a name to use for the backup file.
;;;
(defvar *backup-extension* ".BAK"
"This is a string that OPEN tacks on the end of a file namestring to produce
a name for the :if-exists :rename-and-delete and :rename options. Also,
this can be a function that takes a namestring and returns a complete