Newer
Older
(cond ((eql count 1)
(do-input stream)
(setf (fd-stream-ibuf-head stream) 0)
(setf (fd-stream-ibuf-tail stream) 0))
(t
(return))))))
(: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)
(declare (ignore ino nlink uid gid rdev
atime mtime ctime blksize blocks))
(unless okay
(error "Error fstating ~S: ~A"
stream
(truncate 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)
(declare (type fd-stream stream)
(type (or index (member nil :start :end)) newpos))
(if (null newpos)
(system:without-interrupts
;; First, find the position of the UNIX file descriptor in the
;; file.
(multiple-value-bind
(posn errno)
(unix:unix-lseek (fd-stream-fd stream) 0 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)))
nil)
(t
(system:with-interrupts
(error "Error lseek'ing ~S: ~A"
stream
(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)
;; Trash cashed value for listen, so that we check next time.
(setf (fd-stream-listen stream) nil)
(t
(error "Invalid position given to file-position: ~S" newpos)))
(multiple-value-bind
(posn errno)
(unix:unix-lseek (fd-stream-fd stream) offset origin)
(cond ((typep posn 'fixnum)
;;;; 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)
timeout
file
original
delete-original
(name (if file
(format nil "file ~S" file)
(format nil "descriptor ~D" fd)))
auto-close)
(declare (type index fd) (type (or index null) timeout)
(type (member :none :line :full) buffering))
"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.
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."
(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
:timeout timeout)))
(when (and auto-close (fboundp 'finalize))
(finalize stream
#'(lambda ()
(format *terminal-io* "** Closed file descriptor ~D~%"
fd))))
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
namestring.")
;;;
(defun pick-backup-name (name)
(declare (type simple-string name))
(let ((ext *backup-extension*))
(etypecase ext
(simple-string (concatenate 'simple-string name ext))
(function (funcall ext name)))))
;;; ASSURE-ONE-OF -- internal
;;;
;;; Assure that the given arg is one of the given list of valid things.
;;; Allow the user to fix any problems.
;;;
(defun assure-one-of (item list what)
(unless (member item list)
(loop
(cerror "Enter new value for ~*~S"
"~S is invalid for ~S. Must be one of~{ ~S~}"
item
what
list)
(format (the stream *query-io*) "Enter new value for ~S: " what)
(force-output *query-io*)
(setf item (read *query-io*))
(when (member item list)
(return))))
item)
;;; DO-OLD-RENAME -- Internal
;;;
;;; Rename Namestring to Original. First, check if we have write access,
;;; since we don't want to trash unwritable files even if we technically can.
;;; We return true if we suceed in renaming.
;;;
(defun do-old-rename (namestring original)
(unless (unix:unix-access namestring unix:w_ok)
(cerror "Try to rename it anyway." "File ~S is not writable." namestring))
(multiple-value-bind
(okay err)
(cond (okay t)
(t
(cerror "Use :SUPERSEDE instead."
"Could not rename ~S to ~S: ~A."
namestring
original
;;; OPEN -- public
;;;
;;; Open the given file.
;;;
(defun open (filename
&key
(direction :input)
(if-exists nil if-exists-given)
(if-does-not-exist nil if-does-not-exist-given))
"Return a stream which reads from or writes to Filename.
Defined keywords:
:direction - one of :input, :output, :io, or :probe
:element-type - 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."
;; First, make sure that DIRECTION is valid. Allow it to be changed if not.
(setf direction
(assure-one-of direction
'(:input :output :io :probe)
:direction))
;; Calculate useful stuff.
(multiple-value-bind
(input output mask)
(case direction
(:input (values t nil unix:o_rdonly))
(:output (values nil t unix:o_wronly))
(:io (values t t unix:o_rdwr))
(:probe (values t nil unix:o_rdonly)))
(declare (type index mask))
(namestring (unix-namestring pathname input)))
;; 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)))
(setf if-exists
(assure-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 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))))
(setf if-does-not-exist
(assure-one-of if-does-not-exist
'(:error :create nil)
:if-does-not-exist))
(if (eq if-does-not-exist :create)
(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 if 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)
(declare (ignore inode)
(type (or index null) orig-mode))
(cond
(okay
(when (and output (= (logand orig-mode #o170000)
#o40000))
(error "Cannot open ~S for output: Is a directory."
namestring))
(setf mode (logand orig-mode #o777))
t)
(unless (and exists
(do-old-rename namestring original))
(setf original nil)
(setf delete-original nil)
;; In order to use SUPERSEDE instead, we have
;; to make sure unix:o_creat corresponds to
;; if-does-not-exist. unix:o_creat was set
;; before because of if-exists being :rename.
(unless (eq if-does-not-exist :create)
(setf mask (logior (logandc2 mask unix:o_creat) unix:o_trunc)))
(setf if-exists :supersede))))
;; Okay, now we can try the actual open.
(loop
(multiple-value-bind
(fd errno)
(if namestring
(unix:unix-open namestring mask mode)
(values nil unix:enoent))
(cond ((numberp fd)
(return
(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
:auto-close t))
(:probe
(let ((stream
(%make-fd-stream :name namestring :fd fd
:element-type element-type)))
(close stream)
stream)))))
(case if-does-not-exist
(:error
(cerror "Return NIL."
"Error opening ~S, ~A."
pathname
(:create
(cerror "Return NIL."
"Error creating ~S, path does not exist."
pathname)))
(return nil))
(unless (eq nil if-exists)
(cerror "Return NIL."
"Error opening ~S, ~A."
pathname
(cerror "Try again."
"Error opening ~S, ~A."
pathname
(cerror "Return NIL."
"Error opening ~S, ~A."
pathname
;;;; Initialization.
(defvar *tty* nil
"The stream connected to the controlling terminal or NIL if there is none.")
(defvar *stdin* nil
"The stream connected to the standard input (file descriptor 0).")
(defvar *stdout* nil
"The stream connected to the standard output (file descriptor 1).")
(defvar *stderr* nil
"The stream connected to the standard error output (file descriptor 2).")
;;; STREAM-INIT -- internal interface
;;;
;;; Called when the cold load is first started up.
;;;
(defun stream-init ()
(stream-reinit)
(setf *terminal-io* (make-synonym-stream '*tty*))
(setf *standard-output* (make-synonym-stream '*stdout*))
(setf *standard-input*
(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*)
nil)
;;; STREAM-REINIT -- internal interface
;;;
;;; 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 (unix:unix-open "/dev/tty" unix:o_rdwr #o666)))
(if tty
(setf *tty*
(make-fd-stream tty :name "the Terminal" :input t :output t
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(setf *tty* (make-two-way-stream *stdin* *stdout*))))
nil)
;;;; Beeping.
(defun default-beep-function (stream)
(write-char #\bell stream)
(finish-output stream))
(defvar *beep-function* #'default-beep-function
"This is called in BEEP to feep the user. It takes a stream.")
(defun beep (&optional (stream *terminal-io*))
(funcall *beep-function* stream))
;;;; File position and file length.
;;; File-Position -- Public
;;;
;;; Call the misc method with the :file-position operation.
;;;
(defun file-position (stream &optional position)
"With one argument returns the current position within the file
File-Stream is open to. If the second argument is supplied, then
this becomes the new file position. The second argument may also
be :start or :end for the start and end of the file, respectively."
(unless (streamp stream)
(error "Argument ~S is not a stream." stream))
(funcall (stream-misc stream) stream :file-position position))
;;; File-Length -- Public
;;;
;;; Like File-Position, only use :file-length.
;;;
(defun file-length (stream)
"This function returns the length of the file that File-Stream is open to."
(unless (streamp stream)
(error "Argument ~S is not a stream." stream))
(funcall (stream-misc stream) stream :file-length))
;;; File-Name -- internal interface
;;;
;;; Kind of like File-Position, but is an internal hack used by the filesys
;;; stuff to get and set the file name.
;;;
(defun file-name (stream &optional new-name)
(when (fd-stream-p stream)
(if new-name
(setf (fd-stream-file stream) new-name)
(fd-stream-file stream))))