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;;;; streams for UNIX file descriptors
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;;
;;;; This software is derived from the CMU CL system, which was
;;;; written at Carnegie Mellon University and released into the
;;;; public domain. The software is in the public domain and is
;;;; provided with absolutely no warranty. See the COPYING and CREDITS
;;;; files for more information.
(in-package "SB!IMPL")
;;;; buffer manipulation routines
;;; FIXME: Is it really good to maintain this pool separate from the
;;; GC and the C malloc logic?
;;; FIXME 2: access to this should be locked anyway, probably
(defvar *available-buffers* ()
#!+sb-doc
"List of available buffers. Each buffer is an sap pointing to
bytes-per-buffer of memory.")
(defconstant bytes-per-buffer (* 4 1024)
#!+sb-doc
"Number of bytes per buffer.")
;;; Return the next available buffer, creating one if necessary.
#!-sb-fluid (declaim (inline next-available-buffer))
(defun next-available-buffer ()
(if *available-buffers*
(pop *available-buffers*)
(allocate-system-memory bytes-per-buffer)))
;;;; the FILE-STREAM structure
(defstruct (file-stream
(:constructor %make-fd-stream)
;; KLUDGE: in an ideal world, maybe we'd rewrite
;; everything to use FILE-STREAM rather than simply
;; providing this hack for compatibility with the old
;; code. However, CVS doesn't deal terribly well with
;; file renaming, so for now we use this
;; backward-compatibility feature.
(:conc-name fd-stream-)
(:predicate fd-stream-p)
(:include ansi-stream
(misc #'fd-stream-misc-routine))
(:copier nil))
;; the name of this stream
(name nil)
;; the file this stream is for
(file nil)
;; the backup file namestring for the old file, for :IF-EXISTS
;; :RENAME or :RENAME-AND-DELETE.
(original nil :type (or simple-string null))
(delete-original nil) ; for :if-exists :rename-and-delete
;;; the number of bytes per element
(element-size 1 :type index)
;; the type of element being transfered
(element-type 'base-char)
;; the Unix file descriptor
(fd -1 :type fixnum)
;; 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))
;; the input buffer
(unread nil)
(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)
;; the output buffer
(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))
;; pathname of the file this stream is opened to (returned by PATHNAME)
(pathname nil :type (or pathname null)))
(def!method print-object ((fd-stream file-stream) stream)
(declare (type stream stream))
(print-unreadable-object (fd-stream stream :type t :identity t)
(format stream "for ~S" (fd-stream-name fd-stream))))
;;;; output routines and related noise
(defvar *output-routines* ()
#!+sb-doc
"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.")
;;; common idioms for reporting low-level stream and file problems
(defun simple-stream-perror (note-format stream errno)
(error 'simple-stream-error
:stream stream
:format-control "~@<~?: ~2I~_~A~:>"
:format-arguments (list note-format (list stream) (strerror errno))))
(defun simple-file-perror (note-format pathname errno)
(error 'simple-file-error
:pathname pathname
:format-control "~@<~?: ~2I~_~A~:>"
:format-arguments
(list note-format (list pathname) (strerror errno))))
;;; This is called by the server when we can write to the given file
;;; descriptor. Attempt 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 frob-output-later (stream)
(let* ((stuff (pop (fd-stream-output-later stream)))
(base (car stuff))
(start (cadr stuff))
(end (caddr stuff))
(reuse-sap (cadddr stuff))
(length (- end start)))
(declare (type index start end length))
(multiple-value-bind (count errno)
(sb!unix:unix-write (fd-stream-fd stream)
base
start
length)
(cond ((not count)
(if (= errno sb!unix:ewouldblock)
(error "Write would have blocked, but SERVER told us to go.")
(simple-stream-perror "couldn't write to ~S" stream errno)))
((eql count length) ; Hot damn, it worked.
(when reuse-sap
(push base *available-buffers*)))
((not (null count)) ; sorta worked..
(push (list base
(the index (+ start count))
end)
(fd-stream-output-later stream))))))
(unless (fd-stream-output-later stream)
(sb!sys:remove-fd-handler (fd-stream-handler stream))
(setf (fd-stream-handler stream) nil)))
;;; 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)
(sb!sys:add-fd-handler (fd-stream-fd stream)
:output
(lambda (fd)
(declare (ignore fd))
(frob-output-later stream)))))
(t
(nconc (fd-stream-output-later stream)
(list (list base start end reuse-sap)))))
(when reuse-sap
(let ((new-buffer (next-available-buffer)))
(setf (fd-stream-obuf-sap stream) new-buffer)
(setf (fd-stream-obuf-length stream) bytes-per-buffer))))
;;; Output the given noise. Check to see whether there are any pending
;;; writes. If so, just queue this one. Otherwise, try to write it. If
;;; this would block, queue it.
(defun frob-output (stream base start end reuse-sap)
(declare (type file-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 whether any of this noise can be output
)
(let ((length (- end start)))
(multiple-value-bind (count errno)
(sb!unix:unix-write (fd-stream-fd stream) base start length)
(cond ((not count)
(if (= errno sb!unix:ewouldblock)
(output-later stream base start end reuse-sap)
(simple-stream-perror "couldn't write to ~S"
stream
errno)))
((not (eql count length))
(output-later stream base (the index (+ start count))
end reuse-sap)))))))
;;; Flush any data in the output buffer.
(defun flush-output-buffer (stream)
(let ((length (fd-stream-obuf-tail stream)))
(unless (= length 0)
(frob-output stream (fd-stream-obuf-sap stream) 0 length t)
(setf (fd-stream-obuf-tail stream) 0))))
;;; 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-fmt size &rest bufferings) &body body)
(declare (optimize (speed 1)))
(cons 'progn
(mapcar
(lambda (buffering)
(let ((function
(intern (let ((*print-case* :upcase))
(format nil name-fmt (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 (and (base-char-p byte) (char= byte #\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)))
(def-output-routines ("OUTPUT-UNSIGNED-BYTE-~A-BUFFERED"
1
(:none (unsigned-byte 8))
(:full (unsigned-byte 8)))
(setf (sap-ref-8 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
byte))
(def-output-routines ("OUTPUT-SIGNED-BYTE-~A-BUFFERED"
1
(:none (signed-byte 8))
(:full (signed-byte 8)))
(setf (signed-sap-ref-8 (fd-stream-obuf-sap stream)
(fd-stream-obuf-tail stream))
byte))
(def-output-routines ("OUTPUT-UNSIGNED-SHORT-~A-BUFFERED"
2
(:none (unsigned-byte 16))
(:full (unsigned-byte 16)))
(setf (sap-ref-16 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
byte))
(def-output-routines ("OUTPUT-SIGNED-SHORT-~A-BUFFERED"
2
(:none (signed-byte 16))
(:full (signed-byte 16)))
(setf (signed-sap-ref-16 (fd-stream-obuf-sap stream)
(fd-stream-obuf-tail stream))
byte))
(def-output-routines ("OUTPUT-UNSIGNED-LONG-~A-BUFFERED"
4
(:none (unsigned-byte 32))
(:full (unsigned-byte 32)))
(setf (sap-ref-32 (fd-stream-obuf-sap stream) (fd-stream-obuf-tail stream))
byte))
(def-output-routines ("OUTPUT-SIGNED-LONG-~A-BUFFERED"
4
(:none (signed-byte 32))
(:full (signed-byte 32)))
(setf (signed-sap-ref-32 (fd-stream-obuf-sap stream)
(fd-stream-obuf-tail stream))
byte))
;;; Do 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 (fd-stream thing &optional start end)
#!+sb-doc
"Output THING to FD-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 fd-stream))
(tail (fd-stream-obuf-tail fd-stream))
(space (- len tail))
(bytes (- end start))
(newtail (+ tail bytes)))
(cond ((minusp bytes) ; error case
(error ":END before :START!"))
((zerop bytes)) ; easy case
((<= bytes space)
(if (system-area-pointer-p thing)
(system-area-copy thing
(* start sb!vm:n-byte-bits)
(fd-stream-obuf-sap fd-stream)
(* tail sb!vm:n-byte-bits)
(* bytes sb!vm:n-byte-bits))
;; FIXME: There should be some type checking somewhere to
;; verify that THING here is a vector, not just <not a SAP>.
(copy-to-system-area thing
(+ (* start sb!vm:n-byte-bits)
(* sb!vm:vector-data-offset
sb!vm:n-word-bits))
(fd-stream-obuf-sap fd-stream)
(* tail sb!vm:n-byte-bits)
(* bytes sb!vm:n-byte-bits)))
(setf (fd-stream-obuf-tail fd-stream) newtail))
((<= bytes len)
(flush-output-buffer fd-stream)
(if (system-area-pointer-p thing)
(system-area-copy thing
(* start sb!vm:n-byte-bits)
(fd-stream-obuf-sap fd-stream)
0
(* bytes sb!vm:n-byte-bits))
;; FIXME: There should be some type checking somewhere to
;; verify that THING here is a vector, not just <not a SAP>.
(copy-to-system-area thing
(+ (* start sb!vm:n-byte-bits)
(* sb!vm:vector-data-offset
sb!vm:n-word-bits))
(fd-stream-obuf-sap fd-stream)
0
(* bytes sb!vm:n-byte-bits)))
(setf (fd-stream-obuf-tail fd-stream) bytes))
(t
(flush-output-buffer fd-stream)
(frob-output fd-stream thing start end nil))))))
;;; the 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.
;;; KLUDGE: It would be better to fix the bozos instead of trying to
;;; cover for them here. -- WHN 20000203
(defun fd-sout (stream thing start end)
(let ((start (or start 0))
(end (or end (length (the vector thing)))))
(declare (fixnum start end))
(if (stringp thing)
(let ((last-newline (and (find #\newline (the simple-string thing)
:start start :end end)
;; FIXME why do we need both calls?
;; Is find faster forwards than
;; position is backwards?
(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
(frob-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
(frob-output stream thing start end nil))))))
;;; 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
;;; a 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.
(defvar *input-routines* ())
;;; Fill the input buffer, and return the first character. Throw to
;;; EOF-INPUT-CATCHER if the eof was reached. Drop into SYSTEM:SERVER
;;; if necessary.
(defun frob-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))
(unless (zerop head)
(cond ((eql 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 sb!vm:n-byte-bits)
ibuf-sap 0 (* tail sb!vm:n-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)
;; FIXME: Judging from compiler warnings, this WITH-ALIEN form expands
;; into something which uses the not-yet-defined type
;; (SB!ALIEN-INTERNALS:ALIEN (* (SB!ALIEN:STRUCT SB!UNIX:FD-SET))).
;; This is probably inefficient and unsafe and generally bad, so
;; try to find some way to make that type known before
;; this is compiled.
(sb!alien:with-alien ((read-fds (sb!alien:struct sb!unix:fd-set)))
(sb!unix:fd-zero read-fds)
(sb!unix:fd-set fd read-fds)
(sb!unix:unix-fast-select (1+ fd)
(sb!alien:addr read-fds)
nil
nil
0
0))
(case count
(1)
(0
(unless (sb!sys:wait-until-fd-usable
fd :input (fd-stream-timeout stream))
(error 'io-timeout :stream stream :direction :read)))
(t
(simple-stream-perror "couldn't check whether ~S is readable"
stream
errno))))
(multiple-value-bind (count errno)
(sb!unix:unix-read fd
(sb!sys:int-sap (+ (sb!sys:sap-int ibuf-sap) tail))
(- buflen tail))
(cond ((null count)
(if (eql errno sb!unix:ewouldblock)
(progn
(unless (sb!sys:wait-until-fd-usable
fd :input (fd-stream-timeout stream))
(error 'io-timeout :stream stream :direction :read))
(frob-input stream))
(simple-stream-perror "couldn't read from ~S" stream errno)))
((zerop count)
(setf (fd-stream-listen stream) :eof)
(/show0 "THROWing EOF-INPUT-CATCHER")
(throw 'eof-input-catcher nil))
(t
(incf (fd-stream-ibuf-tail stream) count))))))
;;; Make sure there are at least BYTES number of bytes in the input
;;; buffer. Keep calling FROB-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))
(frob-input ,stream-var)))))
;;; a macro to wrap around all input routines to handle EOF-ERROR noise
(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-var)
(prog1
(fd-stream-unread ,stream-var)
(setf (fd-stream-unread ,stream-var) nil)
(setf (fd-stream-listen ,stream-var) 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)
(t
(eof-or-lose ,stream-var ,eof-error ,eof-value))))))))
(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))))))
;;; STREAM-IN routine for reading a string char
(def-input-routine input-character
(character 1 sap head)
(code-char (sap-ref-8 sap head)))
;;; STREAM-IN routine for reading an unsigned 8 bit number
(def-input-routine input-unsigned-8bit-byte
((unsigned-byte 8) 1 sap head)
(sap-ref-8 sap head))
;;; STREAM-IN routine for reading a signed 8 bit number
(def-input-routine input-signed-8bit-number
((signed-byte 8) 1 sap head)
(signed-sap-ref-8 sap head))
;;; STREAM-IN routine for reading an unsigned 16 bit number
(def-input-routine input-unsigned-16bit-byte
((unsigned-byte 16) 2 sap head)
(sap-ref-16 sap head))
;;; STREAM-IN routine for reading a signed 16 bit number
(def-input-routine input-signed-16bit-byte
((signed-byte 16) 2 sap head)
(signed-sap-ref-16 sap head))
;;; STREAM-IN routine for reading a unsigned 32 bit number
(def-input-routine input-unsigned-32bit-byte
((unsigned-byte 32) 4 sap head)
(sap-ref-32 sap head))
;;; STREAM-IN routine for reading a signed 32 bit number
(def-input-routine input-signed-32bit-byte
((signed-byte 32) 4 sap head)
(signed-sap-ref-32 sap head))
;;; 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))))))
;;; Return a string constructed from SAP, START, and END.
(defun string-from-sap (sap start end)
(declare (type index start end))
(let* ((length (- end start))
(string (make-string length)))
(copy-from-system-area sap (* start sb!vm:n-byte-bits)
string (* sb!vm:vector-data-offset
sb!vm:n-word-bits)
(* length sb!vm:n-byte-bits))
string))
;;; the N-BIN method for FD-STREAMs
;;;
;;; Note that this blocks in UNIX-READ. It is generally used where
;;; there is a definite amount of reading to be done, so blocking
;;; isn't too problematical.
(defun fd-stream-read-n-bytes (stream buffer start requested eof-error-p)
(declare (type file-stream stream))
(declare (type index start requested))
(do ((total-copied 0))
(nil)
(declare (type index total-copied))
(let* ((remaining-request (- requested total-copied))
(head (fd-stream-ibuf-head stream))
(tail (fd-stream-ibuf-tail stream))
(available (- tail head))
(n-this-copy (min remaining-request available))
(this-start (+ start total-copied))
(this-end (+ this-start n-this-copy))
(sap (fd-stream-ibuf-sap stream)))
(declare (type index remaining-request head tail available))
(declare (type index n-this-copy))
;; Copy data from stream buffer into user's buffer.
(%byte-blt sap head buffer this-start this-end)
(incf (fd-stream-ibuf-head stream) n-this-copy)
(incf total-copied n-this-copy)
;; Maybe we need to refill the stream buffer.
(cond (;; If there were enough data in the stream buffer, we're done.
(= total-copied requested)
(return total-copied))
(;; If EOF, we're done in another way.
(zerop (refill-fd-stream-buffer stream))
(if eof-error-p
(error 'end-of-file :stream stream)
(return total-copied)))
;; Otherwise we refilled the stream buffer, so fall
;; through into another pass of the loop.
))))
;;; Try to refill the stream buffer. Return the number of bytes read.
;;; (For EOF, the return value will be zero, otherwise positive.)
(defun refill-fd-stream-buffer (stream)
;; We don't have any logic to preserve leftover bytes in the buffer,
;; so we should only be called when the buffer is empty.
(aver (= (fd-stream-ibuf-head stream) (fd-stream-ibuf-tail stream)))
(multiple-value-bind (count err)
(sb!unix:unix-read (fd-stream-fd stream)
(fd-stream-ibuf-sap stream)
(fd-stream-ibuf-length stream))
(declare (type (or index null) count))
(when (null count)
(simple-stream-perror "couldn't read from ~S" stream err))
(setf (fd-stream-listen stream) nil
(fd-stream-ibuf-head stream) 0
(fd-stream-ibuf-tail stream) count)
count))
;;;; utility functions (misc routines, etc)
;;; 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-fd-stream-routines (fd-stream type input-p output-p buffer-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 fd-stream)
(push (fd-stream-obuf-sap fd-stream) *available-buffers*)
(setf (fd-stream-obuf-sap fd-stream) nil))
(when (fd-stream-ibuf-sap fd-stream)
(push (fd-stream-ibuf-sap fd-stream) *available-buffers*)
(setf (fd-stream-ibuf-sap fd-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 fd-stream) (next-available-buffer))
(setf (fd-stream-ibuf-length fd-stream) bytes-per-buffer)
(setf (fd-stream-ibuf-tail fd-stream) 0)
(if (subtypep type 'character)
(setf (fd-stream-in fd-stream) routine
(fd-stream-bin fd-stream) #'ill-bin)
(setf (fd-stream-in fd-stream) #'ill-in
(fd-stream-bin fd-stream) routine))
(when (eql size 1)
(setf (fd-stream-n-bin fd-stream) #'fd-stream-read-n-bytes)
(when buffer-p
(setf (ansi-stream-in-buffer fd-stream)
(make-array +ansi-stream-in-buffer-length+
:element-type '(unsigned-byte 8)))))
(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 fd-stream))
(unless routine
(error "could not find any output routine for ~S buffered ~S"
(fd-stream-buffering fd-stream)
target-type))
(setf (fd-stream-obuf-sap fd-stream) (next-available-buffer))
(setf (fd-stream-obuf-length fd-stream) bytes-per-buffer)
(setf (fd-stream-obuf-tail fd-stream) 0)
(if (subtypep type 'character)
(setf (fd-stream-out fd-stream) routine
(fd-stream-bout fd-stream) #'ill-bout)
(setf (fd-stream-out fd-stream)
(or (if (eql size 1)
(pick-output-routine 'base-char
(fd-stream-buffering fd-stream)))
#'ill-out)
(fd-stream-bout fd-stream) routine))
(setf (fd-stream-sout fd-stream)
(if (eql size 1) #'fd-sout #'ill-out))
(setf (fd-stream-char-pos fd-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 fd-stream)
(or input-size output-size))
(setf (fd-stream-element-type fd-stream)
(cond ((equal input-type output-type)
input-type)
((null output-type)
input-type)
((null input-type)
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))))))
;;; Handle miscellaneous operations on FD-STREAM.
(defun fd-stream-misc-routine (fd-stream operation &optional arg1 arg2)
(declare (ignore arg2))
(case operation
(:listen
(or (not (eql (fd-stream-ibuf-head fd-stream)
(fd-stream-ibuf-tail fd-stream)))
(fd-stream-listen fd-stream)
(setf (fd-stream-listen fd-stream)
(eql (sb!alien:with-alien ((read-fds (sb!alien:struct
sb!unix:fd-set)))
(sb!unix:fd-zero read-fds)
(sb!unix:fd-set (fd-stream-fd fd-stream) read-fds)
(sb!unix:unix-fast-select (1+ (fd-stream-fd fd-stream))
(sb!alien:addr read-fds)
nil nil 0 0))
1))))
(:unread
(setf (fd-stream-unread fd-stream) arg1)
(setf (fd-stream-listen fd-stream) t))
(:close
(cond (arg1
;; We got us an abort on our hands.
(when (fd-stream-handler fd-stream)
(sb!sys:remove-fd-handler (fd-stream-handler fd-stream))
(setf (fd-stream-handler fd-stream) nil))
(when (and (fd-stream-file fd-stream)
(fd-stream-obuf-sap fd-stream))
;; We 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 fd-stream)
;; We have a handle on the original, just revert.
(multiple-value-bind (okay err)
(sb!unix:unix-rename (fd-stream-original fd-stream)
(fd-stream-file fd-stream))
(unless okay
(simple-stream-perror
"couldn't restore ~S to its original contents"
fd-stream
err)))
;; We can't restore the original, so nuke that puppy.
(multiple-value-bind (okay err)
(sb!unix:unix-unlink (fd-stream-file fd-stream))
(unless okay
(error 'simple-file-error
:pathname (fd-stream-file fd-stream)
:format-control
"~@<couldn't remove ~S: ~2I~_~A~:>"
:format-arguments (list (fd-stream-file fd-stream)
(strerror err))))))))
(t
(fd-stream-misc-routine fd-stream :finish-output)
(when (and (fd-stream-original fd-stream)
(fd-stream-delete-original fd-stream))
(multiple-value-bind (okay err)
(sb!unix:unix-unlink (fd-stream-original fd-stream))
(unless okay
(error 'simple-file-error
:pathname (fd-stream-original fd-stream)
:format-control
"~@<couldn't delete ~S during close of ~S: ~
~2I~_~A~:>"
:format-arguments
(list (fd-stream-original fd-stream)
fd-stream
(strerror err))))))))
(when (fboundp 'cancel-finalization)
(cancel-finalization fd-stream))
(sb!unix:unix-close (fd-stream-fd fd-stream))
(when (fd-stream-obuf-sap fd-stream)
(push (fd-stream-obuf-sap fd-stream) *available-buffers*)
(setf (fd-stream-obuf-sap fd-stream) nil))
(when (fd-stream-ibuf-sap fd-stream)
(push (fd-stream-ibuf-sap fd-stream) *available-buffers*)
(setf (fd-stream-ibuf-sap fd-stream) nil))
(sb!impl::set-closed-flame fd-stream))
(:clear-input
(setf (fd-stream-unread fd-stream) nil)
(setf (fd-stream-ibuf-head fd-stream) 0)
(setf (fd-stream-ibuf-tail fd-stream) 0)
(catch 'eof-input-catcher
(loop
(let ((count (sb!alien:with-alien ((read-fds (sb!alien:struct
sb!unix:fd-set)))
(sb!unix:fd-zero read-fds)
(sb!unix:fd-set (fd-stream-fd fd-stream) read-fds)
(sb!unix:unix-fast-select (1+ (fd-stream-fd fd-stream))
(sb!alien:addr read-fds)
nil
nil
0
0))))
(cond ((eql count 1)
(frob-input fd-stream)
(setf (fd-stream-ibuf-head fd-stream) 0)
(setf (fd-stream-ibuf-tail fd-stream) 0))
(t
(return t)))))))
(:force-output
(flush-output-buffer fd-stream))
(:finish-output
(flush-output-buffer fd-stream)
(do ()
((null (fd-stream-output-later fd-stream)))
(sb!sys:serve-all-events)))
(:element-type
(fd-stream-element-type fd-stream))
(:interactive-p
;; FIXME: sb!unix:unix-isatty is undefined.
(sb!unix:unix-isatty (fd-stream-fd fd-stream)))
(:line-length
80)
(:charpos
(fd-stream-char-pos fd-stream))
(:file-length
(unless (fd-stream-file fd-stream)
;; This is a TYPE-ERROR because ANSI's species FILE-LENGTH
;; "should signal an error of type TYPE-ERROR if stream is not
;; a stream associated with a file". Too bad there's no very
;; appropriate value for the EXPECTED-TYPE slot..
(error 'simple-type-error
:datum fd-stream
:expected-type 'file-stream
:format-control "~S is not a stream associated with a file."
:format-arguments (list fd-stream)))
(multiple-value-bind (okay dev ino mode nlink uid gid rdev size
atime mtime ctime blksize blocks)
(sb!unix:unix-fstat (fd-stream-fd fd-stream))
(declare (ignore ino nlink uid gid rdev
atime mtime ctime blksize blocks))
(unless okay
(simple-stream-perror "failed Unix fstat(2) on ~S" fd-stream dev))
(if (zerop mode)
nil
(truncate size (fd-stream-element-size fd-stream)))))
(:file-position
(fd-stream-file-position fd-stream arg1))))
(defun fd-stream-file-position (stream &optional newpos)
(declare (type file-stream stream)
(type (or index (member nil :start :end)) newpos))
(if (null newpos)
(sb!sys:without-interrupts
;; First, find the position of the UNIX file descriptor in the file.
(multiple-value-bind (posn errno)
(sb!unix:unix-lseek (fd-stream-fd stream) 0 sb!unix:l_incr)
(declare (type (or index null) posn))
(cond ((fixnump 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 (- (the index (caddr later))
(the index (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.
(truncate posn (fd-stream-element-size stream)))
((eq errno sb!unix:espipe)
nil)
(t
(sb!sys:with-interrupts
(simple-stream-perror "failure in Unix lseek() on ~S"
stream
errno))))))
(let ((offset 0) origin)
(declare (type index offset))
;; 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)))
(sb!sys: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)
;; Trash cached value for listen, so that we check next time.
(setf (fd-stream-listen stream) nil)
;; Now move it.
(cond ((eq newpos :start)
(setf offset 0 origin sb!unix:l_set))
((eq newpos :end)
(setf offset 0 origin sb!unix:l_xtnd))
((typep newpos 'index)
(setf offset (* newpos (fd-stream-element-size stream))
origin sb!unix:l_set))
(t
(error "invalid position given to FILE-POSITION: ~S" newpos)))
(multiple-value-bind (posn errno)
(sb!unix:unix-lseek (fd-stream-fd stream) offset origin)
(cond ((typep posn 'fixnum)
t)
((eq errno sb!unix:espipe)
nil)
(t
(simple-stream-perror "error in Unix lseek() on ~S"
stream
errno)))))))
;;;; creation routines (MAKE-FD-STREAM and OPEN)
;;; 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 is specified,
;;; default to allowing input.
;;;
;;; ELEMENT-TYPE indicates the element type to use (as for OPEN).
;;;
;;; BUFFERING indicates the kind of buffering to use.
;;;
;;; TIMEOUT (if true) is the number of seconds to wait for input. If
;;; NIL (the default), then wait forever. When we time out, we signal
;;; IO-TIMEOUT.
;;;
;;; FILE is the name of the file (will be returned by PATHNAME).
;;;
;;; NAME is used to identify the stream when printed.
(defun make-fd-stream (fd
&key
(input nil input-p)
(output nil output-p)
(element-type 'base-char)
(buffering :full)
timeout
file
original
delete-original
pathname
input-buffer-p
(name (if file
(format nil "file ~S" file)
(format nil "descriptor ~W" fd)))
auto-close)
(declare (type index fd) (type (or index null) timeout)
(type (member :none :line :full) buffering))
(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
:pathname pathname
:buffering buffering
:timeout timeout)))
(set-fd-stream-routines stream element-type input output input-buffer-p)
(when (and auto-close (fboundp 'finalize))
(finalize stream
(lambda ()
(sb!unix:unix-close fd)
#!+sb-show
(format *terminal-io* "** closed file descriptor ~W **~%"
fd))))
stream))
;;; Pick a name to use for the backup file for the :IF-EXISTS
;;; :RENAME-AND-DELETE and :RENAME options.
(defun pick-backup-name (name)
(declare (type simple-string name))
(concatenate 'simple-string name ".bak"))
;;; Ensure that the given arg is one of the given list of valid
;;; things. Allow the user to fix any problems.
(defun ensure-one-of (item list what)
(unless (member item list)
(error 'simple-type-error
:datum item
:expected-type `(member ,@list)
:format-control "~@<~S is ~_invalid for ~S; ~_need one of~{ ~S~}~:>"
:format-arguments (list item what list))))
;;; Rename NAMESTRING to ORIGINAL. First, check whether we have write
;;; access, since we don't want to trash unwritable files even if we
;;; technically can. We return true if we succeed in renaming.
(defun rename-the-old-one (namestring original)
(unless (sb!unix:unix-access namestring sb!unix:w_ok)
(error "~@<The file ~2I~_~S ~I~_is not writable.~:>" namestring))
(multiple-value-bind (okay err) (sb!unix:unix-rename namestring original)
(if okay
t
(error 'simple-file-error
:pathname namestring
:format-control
"~@<couldn't rename ~2I~_~S ~I~_to ~2I~_~S: ~4I~_~A~:>"
:format-arguments (list namestring original (strerror err))))))
(defun open (filename
&key
(direction :input)
(element-type 'base-char)
(if-exists nil if-exists-given)
(if-does-not-exist nil if-does-not-exist-given)
(external-format :default)
&aux ; Squelch assignment warning.
(direction direction)
(if-does-not-exist if-does-not-exist)
(if-exists if-exists))
#!+sb-doc
"Return a stream which reads from or writes to FILENAME.
Defined keywords:
:DIRECTION - one of :INPUT, :OUTPUT, :IO, or :PROBE
:ELEMENT-TYPE - the type of object to read or write, default BASE-CHAR
:IF-EXISTS - one of :ERROR, :NEW-VERSION, :RENAME, :RENAME-AND-DELETE,
:OVERWRITE, :APPEND, :SUPERSEDE or NIL
:IF-DOES-NOT-EXIST - one of :ERROR, :CREATE or nil
See the manual for details."
(unless (eq external-format :default)
(error "Any external format other than :DEFAULT isn't recognized."))
;; First, make sure that DIRECTION is valid.
(ensure-one-of direction
'(:input :output :io :probe)
:direction)
;; Calculate useful stuff.
(multiple-value-bind (input output mask)
(case direction
(:input (values t nil sb!unix:o_rdonly))
(:output (values nil t sb!unix:o_wronly))
(:io (values t t sb!unix:o_rdwr))
(:probe (values t nil sb!unix:o_rdonly)))
(declare (type index mask))
(let* ((pathname (merge-pathnames filename))
(namestring
(cond ((unix-namestring pathname input))
((and input (eq if-does-not-exist :create))
(unix-namestring pathname nil)))))
;; Process if-exists argument if we are doing any output.
(cond (output
(unless if-exists-given
(setf if-exists
(if (eq (pathname-version pathname) :newest)
:new-version
:error)))
(ensure-one-of if-exists
'(:error :new-version :rename
:rename-and-delete :overwrite
:append :supersede nil)
:if-exists)
(case if-exists
((:error nil)
(setf mask (logior mask sb!unix:o_excl)))
((:rename :rename-and-delete)
(setf mask (logior mask sb!unix:o_creat)))
((:new-version :supersede)
(setf mask (logior mask sb!unix:o_trunc)))
(:append
(setf mask (logior mask sb!unix:o_append)))))
(t
(setf if-exists :ignore-this-arg)))
(unless if-does-not-exist-given
(setf if-does-not-exist
(cond ((eq direction :input) :error)
((and output
(member if-exists '(:overwrite :append)))
:error)
((eq direction :probe)
nil)
(t
:create))))
(ensure-one-of if-does-not-exist
'(:error :create nil)
:if-does-not-exist)
(if (eq if-does-not-exist :create)
(setf mask (logior mask sb!unix:o_creat)))
(let ((original (if (member if-exists
'(:rename :rename-and-delete))
(pick-backup-name namestring)))
(delete-original (eq if-exists :rename-and-delete))
(mode #o666))
(when original
;; We are doing a :RENAME or :RENAME-AND-DELETE. Determine
;; whether the file already exists, make sure the original
;; file is not a directory, and keep the mode.
(let ((exists
(and namestring
(multiple-value-bind (okay err/dev inode orig-mode)
(sb!unix:unix-stat namestring)
(declare (ignore inode)
(type (or index null) orig-mode))
(cond
(okay
(when (and output (= (logand orig-mode #o170000)
#o40000))
(error 'simple-file-error
:pathname namestring
:format-control
"can't open ~S for output: is a directory"
:format-arguments (list namestring)))
(setf mode (logand orig-mode #o777))
t)
((eql err/dev sb!unix:enoent)
nil)
(t
(simple-file-perror "can't find ~S"
namestring
err/dev)))))))
(unless (and exists
(rename-the-old-one namestring original))
(setf original nil)
(setf delete-original nil)
;; In order to use :SUPERSEDE instead, we have to make
;; sure SB!UNIX:O_CREAT corresponds to
;; IF-DOES-NOT-EXIST. SB!UNIX:O_CREAT was set before
;; because of IF-EXISTS being :RENAME.
(unless (eq if-does-not-exist :create)
(setf mask
(logior (logandc2 mask sb!unix:o_creat)
sb!unix:o_trunc)))
(setf if-exists :supersede))))
;; Now we can try the actual Unix open(2).
(multiple-value-bind (fd errno)
(if namestring
(sb!unix:unix-open namestring mask mode)
(values nil sb!unix:enoent))
(labels ((open-error (format-control &rest format-arguments)
(error 'simple-file-error
:pathname pathname
:format-control format-control
:format-arguments format-arguments))
(vanilla-open-error ()
(simple-file-perror "error opening ~S" pathname errno)))
(cond ((numberp fd)
(case direction
((:input :output :io)
(make-fd-stream fd
:input input
:output output
:element-type element-type
:file namestring
:original original
:delete-original delete-original
:pathname pathname
:input-buffer-p t
:auto-close t))
(:probe
(let ((stream
(%make-fd-stream :name namestring
:fd fd
:pathname pathname
:element-type element-type)))
(close stream)
stream))))
((eql errno sb!unix:enoent)
(case if-does-not-exist
(:error (vanilla-open-error))
(:create
(open-error "~@<The path ~2I~_~S ~I~_does not exist.~:>"
pathname))
(t nil)))
((and (eql errno sb!unix:eexist) if-exists)
nil)
(t
(vanilla-open-error)))))))))
;;;; initialization
;;; the stream connected to the controlling terminal, or NIL if there is none
(defvar *tty*)
;;; the stream connected to the standard input (file descriptor 0)
(defvar *stdin*)
;;; the stream connected to the standard output (file descriptor 1)
(defvar *stdout*)
;;; the stream connected to the standard error output (file descriptor 2)
(defvar *stderr*)
;;; This is called when the cold load is first started up, and may also
;;; be called in an attempt to recover from nested errors.
(defun stream-cold-init-or-reset ()
(stream-reinit)
(setf *terminal-io* (make-synonym-stream '*tty*))
(setf *standard-output* (make-synonym-stream '*stdout*))
(setf *standard-input*
(#!-high-security
;; FIXME: Why is *STANDARD-INPUT* a TWO-WAY-STREAM? ANSI says
;; it's an input stream.
make-two-way-stream
#!+high-security
%make-two-way-stream (make-synonym-stream '*stdin*)
*standard-output*))
(setf *error-output* (make-synonym-stream '*stderr*))
(setf *query-io* (make-synonym-stream '*terminal-io*))
(setf *debug-io* *query-io*)
(setf *trace-output* *standard-output*)
(values))
;;; This is called whenever a saved core is restarted.
(defun stream-reinit ()
(setf *available-buffers* nil)
(setf *stdin*
(make-fd-stream 0 :name "standard input" :input t :buffering :line))
(setf *stdout*
(make-fd-stream 1 :name "standard output" :output t :buffering :line))
(setf *stderr*
(make-fd-stream 2 :name "standard error" :output t :buffering :line))
(let ((tty (sb!unix:unix-open "/dev/tty" sb!unix:o_rdwr #o666)))
(if tty
(setf *tty*
(make-fd-stream tty
:name "the terminal"
:input t
:output t
:buffering :line
:auto-close t))
(setf *tty* (make-two-way-stream *stdin* *stdout*))))
(values))
;;;; miscellany
;;; the Unix way to beep
(defun beep (stream)
(write-char (code-char bell-char-code) stream)
(finish-output stream))
;;; This is kind of like FILE-POSITION, but is an internal hack used
;;; by the filesys stuff to get and set the file name.
;;;
;;; FIXME: misleading name, screwy interface
(defun file-name (stream &optional new-name)
(when (typep stream 'file-stream)
(cond (new-name
(setf (fd-stream-pathname stream) new-name)
(setf (fd-stream-file stream)
(unix-namestring new-name nil))
t)
(t
(fd-stream-pathname stream)))))
;;;; international character support (which is trivial for our simple
;;;; character sets)
;;;; (Those who do Lisp only in English might not remember that ANSI
;;;; requires these functions to be exported from package
;;;; COMMON-LISP.)
(defun file-string-length (stream object)
(declare (type (or string character) object) (type file-stream stream))
#!+sb-doc
"Return the delta in STREAM's FILE-POSITION that would be caused by writing
OBJECT to STREAM. Non-trivial only in implementations that support
international character sets."
(declare (ignore stream))
(etypecase object
(character 1)
(string (length object))))
(defun stream-external-format (stream)
(declare (type file-stream stream) (ignore stream))
#!+sb-doc
"Return :DEFAULT."
:default)