;;;; hacking the Unix environment
(def-alien-routine ("getenv" posix-getenv) c-string
- "Return the environment string \"name=value\" which corresponds to NAME, or
- NIL if there is none."
+ "Return the \"value\" part of the environment string \"name=value\" which
+ corresponds to NAME, or NIL if there is none."
(name c-string))
\f
;;; from stdio.h
(/show0 "unix.lisp 220")
-;;; FIXME: Isn't there some way to use a C wrapper to avoid this hand-copying?
-(defconstant +max-s-long+ 2147483647)
-(defconstant +max-u-long+ 4294967295)
-(def-alien-type quad-t #+nil long-long #-nil (array long 2))
-(def-alien-type uquad-t #+nil unsigned-long-long
- #-nil (array unsigned-long 2))
-(def-alien-type qaddr-t (* quad-t))
-(def-alien-type daddr-t int)
-(def-alien-type caddr-t (* char))
-(def-alien-type swblk-t long)
-(def-alien-type size-t unsigned-int)
-(def-alien-type ssize-t int)
-
-;;; FIXME: We shouldn't hand-copy types from header files into Lisp like this
-;;; unless we have extreme provocation. Reading directories is not extreme
-;;; enough, since it doesn't need to be blindingly fast: we can just implement
-;;; those functions in C as a wrapper layer.
+;;; FIXME: We shouldn't hand-copy types from header files into Lisp
+;;; like this unless we have extreme provocation. Reading directories
+;;; is not extreme enough, since it doesn't need to be blindingly
+;;; fast: we can just implement those functions in C as a wrapper
+;;; layer.
(def-alien-type fd-mask unsigned-long)
(eval-when (:compile-toplevel :load-toplevel :execute)
(values (deref fds 0) (deref fds 1))
(cast fds (* int)))))
-;;; UNIX-CHDIR accepts a directory name and makes that the
-;;; current working directory.
-(defun unix-chdir (path)
- (declare (type unix-pathname path))
- (void-syscall ("chdir" c-string) path))
-
(defun unix-mkdir (name mode)
(declare (type unix-pathname name)
(type unix-file-mode mode))
(void-syscall ("mkdir" c-string int) name mode))
-;;; Return the current directory as a SIMPLE-STRING.
-(defun unix-current-directory ()
- ;; FIXME: Gcc justifiably complains that getwd is dangerous and should
- ;; not be used; especially with a hardwired 1024 buffer size, yecch.
- ;; This should be rewritten to use getcwd(3), perhaps by writing
- ;; a C service routine to do the actual call to getcwd(3) and check
- ;; of return values.
- (with-alien ((buf (array char 1024)))
- (values (not (zerop (alien-funcall (extern-alien "getwd"
- (function int (* char)))
- (cast buf (* char)))))
- (cast buf c-string))))
+;;; Return the Unix current directory as a SIMPLE-STRING, in the
+;;; style returned by getcwd() (no trailing slash character).
+(defun posix-getcwd ()
+ ;; This implementation relies on a BSD/Linux extension to getcwd()
+ ;; behavior, automatically allocating memory when a null buffer
+ ;; pointer is used. On a system which doesn't support that
+ ;; extension, it'll have to be rewritten somehow.
+ #!-(or linux openbsd freebsd) (,stub,)
+ (let* ((raw-char-ptr (alien-funcall (extern-alien "getcwd"
+ (function (* char)
+ (* char) size-t))
+ nil 0)))
+ (if (null-alien raw-char-ptr)
+ (simple-perror "getcwd")
+ (prog1
+ (cast raw-char-ptr c-string)
+ (free-alien raw-char-ptr)))))
+
+;;; Return the Unix current directory as a SIMPLE-STRING terminated
+;;; by a slash character.
+(defun posix-getcwd/ ()
+ (concatenate 'string (posix-getcwd) "/"))
+
+;;; Convert at the UNIX level from a possibly relative filename to
+;;; an absolute filename.
+;;;
+;;; FIXME: Do we still need this even as we switch to
+;;; *DEFAULT-PATHNAME-DEFAULTS*? I think maybe we do, since it seems
+;;; to be valid for the user to set *DEFAULT-PATHNAME-DEFAULTS* to
+;;; have a NIL directory component, and then this'd be the only way to
+;;; interpret a relative directory specification. But I don't find the
+;;; ANSI pathname documentation to be a model of clarity. Maybe
+;;; someone who understands it better can take a look at this.. -- WHN
+(defun unix-maybe-prepend-current-directory (name)
+ (declare (simple-string name))
+ (if (and (> (length name) 0) (char= (schar name 0) #\/))
+ name
+ (concatenate 'simple-string (posix-getcwd/) name)))
;;; Duplicate an existing file descriptor (given as the argument) and
;;; return it. If FD is not a valid file descriptor, NIL and an error
;;; Return the real user-id associated with the current process.
(def-alien-routine ("getuid" unix-getuid) int)
-;;; Invoke readlink(2) on the file name specified by the simple string
-;;; PATH. Return up to two values: the contents of the symbolic link
-;;; if the call is successful, or NIL and the Unix error number.
+;;; Invoke readlink(2) on the file name specified by PATH. Return
+;;; (VALUES LINKSTRING NIL) on success, or (VALUES NIL ERRNO) on
+;;; failure.
(defun unix-readlink (path)
(declare (type unix-pathname path))
- (with-alien ((buf (array char 1024)))
- (syscall ("readlink" c-string (* char) int)
- (let ((string (make-string result)))
- (sb!kernel:copy-from-system-area
- (alien-sap buf) 0
- string (* sb!vm:vector-data-offset sb!vm:word-bits)
- (* result sb!vm:byte-bits))
- string)
- path (cast buf (* char)) 1024)))
+ (with-alien ((ptr (* char)
+ (alien-funcall (extern-alien
+ "wrapped_readlink"
+ (function (* char) c-string))
+ path)))
+ (if (null-alien ptr)
+ (values nil (get-errno))
+ (multiple-value-prog1
+ (values (with-alien ((c-string c-string ptr)) c-string)
+ nil)
+ (free-alien ptr)))))
;;; UNIX-UNLINK accepts a name and deletes the directory entry for that
;;; name and the file if this is the last link.
(declare (type unix-pathname name))
(void-syscall ("unlink" c-string) name))
-;;; Set the tty-process-group for the unix file-descriptor FD to PGRP.
-;;; If not supplied, FD defaults to "/dev/tty".
-(defun %set-tty-process-group (pgrp &optional fd)
- (let ((old-sigs (unix-sigblock (sigmask :sigttou
- :sigttin
- :sigtstp
- :sigchld))))
- (declare (type (unsigned-byte 32) old-sigs))
- (unwind-protect
- (if fd
- (tcsetpgrp fd pgrp)
- (multiple-value-bind (tty-fd errno) (unix-open "/dev/tty" o_rdwr 0)
- (cond (tty-fd
- (multiple-value-prog1
- (tcsetpgrp tty-fd pgrp)
- (unix-close tty-fd)))
- (t
- (values nil errno)))))
- (unix-sigsetmask old-sigs))))
-
;;; Return the name of the host machine as a string.
(defun unix-gethostname ()
(with-alien ((buf (array char 256)))
#!-sb-fluid (declaim (inline unix-fast-getrusage))
(defun unix-fast-getrusage (who)
(declare (values (member t)
- (unsigned-byte 31) (mod 1000000)
- (unsigned-byte 31) (mod 1000000)))
+ (unsigned-byte 31) (integer 0 1000000)
+ (unsigned-byte 31) (integer 0 1000000)))
(with-alien ((usage (struct rusage)))
(syscall* ("getrusage" int (* (struct rusage)))
(values t
\f
;;;; sys/select.h
-(defmacro unix-fast-select (num-descriptors
- read-fds write-fds exception-fds
- timeout-secs &optional (timeout-usecs 0))
- #!+sb-doc
- "Perform the UNIX select(2) system call."
- (declare (type (integer 0 #.FD-SETSIZE) num-descriptors)
+;;;; FIXME: Why have both UNIX-SELECT and UNIX-FAST-SELECT?
+
+;;; Perform the UNIX select(2) system call.
+(declaim (inline unix-fast-select)) ; (used to be a macro in CMU CL)
+(defun unix-fast-select (num-descriptors
+ read-fds write-fds exception-fds
+ timeout-secs &optional (timeout-usecs 0))
+ (declare (type (integer 0 #.fd-setsize) num-descriptors)
(type (or (alien (* (struct fd-set))) null)
read-fds write-fds exception-fds)
(type (or null (unsigned-byte 31)) timeout-secs)
- (type (unsigned-byte 31) timeout-usecs) )
+ (type (unsigned-byte 31) timeout-usecs))
;; FIXME: CMU CL had
- ;; (optimize (speed 3) (safety 0) (inhibit-warnings 3))
- ;; in the declarations above. If they're important, they should
- ;; be in a declaration inside the LET expansion, not in the
- ;; macro compile-time code.
- `(let ((timeout-secs ,timeout-secs))
- (with-alien ((tv (struct timeval)))
- (when timeout-secs
- (setf (slot tv 'tv-sec) timeout-secs)
- (setf (slot tv 'tv-usec) ,timeout-usecs))
- (int-syscall ("select" int (* (struct fd-set)) (* (struct fd-set))
- (* (struct fd-set)) (* (struct timeval)))
- ,num-descriptors ,read-fds ,write-fds ,exception-fds
- (if timeout-secs (alien-sap (addr tv)) (int-sap 0))))))
+ ;; (declare (optimize (speed 3) (safety 0) (inhibit-warnings 3)))
+ ;; here. Is that important for SBCL? If so, why? Profiling might tell us..
+ (with-alien ((tv (struct timeval)))
+ (when timeout-secs
+ (setf (slot tv 'tv-sec) timeout-secs)
+ (setf (slot tv 'tv-usec) timeout-usecs))
+ (int-syscall ("select" int (* (struct fd-set)) (* (struct fd-set))
+ (* (struct fd-set)) (* (struct timeval)))
+ num-descriptors read-fds write-fds exception-fds
+ (if timeout-secs (alien-sap (addr tv)) (int-sap 0)))))
;;; UNIX-SELECT accepts sets of file descriptors and waits for an event
;;; to happen on one of them or to time out.
;;; Note that st-dev is a long, not a dev-t. This is because dev-t on
;;; linux 32 bit archs is a 64 bit quantity, but alien doesn's support
;;; those. We don't actually access that field anywhere, though, so
-;;; until we can get 64 bit alien support it'll do.
+;;; until we can get 64 bit alien support it'll do. Also note that
+;;; st_size is a long, not an off-t, because off-t is a 64-bit
+;;; quantity on Alpha. And FIXME: "No one would want a file length
+;;; longer than 32 bits anyway, right?":-|
(def-alien-type nil
(struct wrapped_stat
- (st-dev unsigned-long) ;would be dev-t in a real stat
+ (st-dev unsigned-long) ; would be dev-t in a real stat
(st-ino ino-t)
(st-mode mode-t)
(st-nlink nlink-t)
(st-uid uid-t)
(st-gid gid-t)
- (st-rdev unsigned-long) ;ditto
- (st-size off-t)
+ (st-rdev unsigned-long) ; would be dev-t in a real stat
+ (st-size unsigned-long) ; would be off-t in a real stat
(st-blksize unsigned-long)
(st-blocks unsigned-long)
(st-atime time-t)
;;; shared C-struct-to-multiple-VALUES conversion for the stat(2)
;;; family of Unix system calls
+;;;
+;;; FIXME: I think this should probably not be INLINE. However, when
+;;; this was not inline, it seemed to cause memory corruption
+;;; problems. My first guess is that it's a bug in the FFI code, where
+;;; the WITH-ALIEN expansion doesn't deal well with being wrapped
+;;; around a call to a function returning >10 values. But I didn't try
+;;; to figure it out, just inlined it as a quick fix. Perhaps someone
+;;; who's motivated to debug the FFI code can go over the DISASSEMBLE
+;;; output in the not-inlined case and see whether there's a problem,
+;;; and maybe even find a fix..
+(declaim (inline %extract-stat-results))
(defun %extract-stat-results (wrapped-stat)
- (declare (type (alien (* (struct wrapped_stat)))))
+ (declare (type (alien (* (struct wrapped_stat))) wrapped-stat))
(values t
(slot wrapped-stat 'st-dev)
(slot wrapped-stat 'st-ino)
(slot wrapped-stat 'st-uid)
(slot wrapped-stat 'st-gid)
(slot wrapped-stat 'st-rdev)
- ;; FIXME: OpenBSD has a 64-bit st_size slot, which is
- ;; basically a good thing, except that it is too
- ;; 21st-century for sbcl-0.6.12.8's FFI to handle. As a
- ;; quick kludgy workaround, we return a 0 placeholder from
- ;; this function, and downstream we stub out the FILE-LENGTH
- ;; operation (which is the only place that SBCL actually
- ;; uses the SIZE value returned from any UNIX-STAT-ish call).
- #!+openbsd 0
- #!-openbsd (slot wrapped-stat 'st-size)
+ (slot wrapped-stat 'st-size)
(slot wrapped-stat 'st-atime)
(slot wrapped-stat 'st-mtime)
(slot wrapped-stat 'st-ctime)
(slot wrapped-stat 'st-blksize)
(slot wrapped-stat 'st-blocks)))
-;;; The stat(2) family of Unix system calls are implemented as calls
-;;; to C-level wrapper functions which copies all the raw "struct
-;;; stat" slots into a system-independent format, so that we don't
-;;; need to mess around with tweaking the Lisp code to correspond to
-;;; different OS/CPU combinations.
+;;; Unix system calls in the stat(2) family are handled by calls to
+;;; C-level wrapper functions which copy all the raw "struct stat"
+;;; slots into the system-independent wrapped_stat format.
;;; stat(2) <-> stat_wrapper()
;;; fstat(2) <-> fstat_wrapper()
;;; lstat(2) <-> lstat_wrapper()
-;;; Then this function is used to convert all the stat slots into
-;;; multiple return values.
(defun unix-stat (name)
(declare (type unix-pathname name))
(with-alien ((buf (struct wrapped_stat)))
(syscall ("stat_wrapper" c-string (* (struct wrapped_stat)))
- (%extract-stat-results buf)
+ (%extract-stat-results (addr buf))
name (addr buf))))
(defun unix-lstat (name)
(declare (type unix-pathname name))
(with-alien ((buf (struct wrapped_stat)))
(syscall ("lstat_wrapper" c-string (* (struct wrapped_stat)))
- (%extract-stat-results buf)
+ (%extract-stat-results (addr buf))
name (addr buf))))
(defun unix-fstat (fd)
(declare (type unix-fd fd))
(with-alien ((buf (struct wrapped_stat)))
(syscall ("fstat_wrapper" int (* (struct wrapped_stat)))
- (%extract-stat-results buf)
+ (%extract-stat-results (addr buf))
fd (addr buf))))
\f
;;;; time.h
-;; the POSIX.4 structure for a time value. This is like a `struct
-;; timeval' but has nanoseconds instead of microseconds.
+;; the POSIX.4 structure for a time value. This is like a "struct
+;; timeval" but has nanoseconds instead of microseconds.
(def-alien-type nil
(struct timespec
(tv-sec long) ; seconds
(tm-sec int) ; Seconds. [0-60] (1 leap second)
(tm-min int) ; Minutes. [0-59]
(tm-hour int) ; Hours. [0-23]
- (tm-mday int) ; Day. [1-31]
- (tm-mon int) ; Month. [0-11]
- (tm-year int) ; Year - 1900.
- (tm-wday int) ; Day of week. [0-6]
- (tm-yday int) ; Days in year.[0-365]
- (tm-isdst int) ; DST. [-1/0/1]
- (tm-gmtoff long) ; Seconds east of UTC.
- (tm-zone c-string))) ; Timezone abbreviation.
+ (tm-mday int) ; Day. [1-31]
+ (tm-mon int) ; Month. [0-11]
+ (tm-year int) ; Year - 1900.
+ (tm-wday int) ; Day of week. [0-6]
+ (tm-yday int) ; Days in year. [0-365]
+ (tm-isdst int) ; DST. [-1/0/1]
+ (tm-gmtoff long) ; Seconds east of UTC.
+ (tm-zone c-string))) ; Timezone abbreviation.
(def-alien-routine get-timezone sb!c-call:void
(when sb!c-call:long :in)
((eql kind s-iflnk) :link)
(t :special))))))
-(defun unix-maybe-prepend-current-directory (name)
- (declare (simple-string name))
- (if (and (> (length name) 0) (char= (schar name 0) #\/))
- name
- (multiple-value-bind (win dir) (unix-current-directory)
- (if win
- (concatenate 'simple-string dir "/" name)
- name))))
-
-;;; Return the pathname with all symbolic links resolved.
-;;;
-;;; FIXME: Could we just use Unix readlink(2) instead?
+;;; Is the Unix pathname PATHNAME relative, instead of absolute? (E.g.
+;;; "passwd" or "etc/passwd" instead of "/etc/passwd"?)
+(defun relative-unix-pathname? (pathname)
+ (declare (type simple-string pathname))
+ (or (zerop (length pathname))
+ (char/= (schar pathname 0) #\/)))
+
+;;; Return PATHNAME with all symbolic links resolved. PATHNAME should
+;;; already be a complete absolute Unix pathname, since at least in
+;;; sbcl-0.6.12.36 we're called only from TRUENAME, and only after
+;;; paths have been converted to absolute paths, so we don't need to
+;;; try to handle any more generality than that.
(defun unix-resolve-links (pathname)
- (declare (simple-string pathname))
- (let ((len (length pathname))
- (pending pathname))
- (declare (fixnum len) (simple-string pending))
- (if (zerop len)
- pathname
- (let ((result (make-string 1024 :initial-element (code-char 0)))
- (fill-ptr 0)
- (name-start 0))
- (loop
- (let* ((name-end (or (position #\/ pending :start name-start) len))
- (new-fill-ptr (+ fill-ptr (- name-end name-start))))
- (replace result pending
- :start1 fill-ptr
- :end1 new-fill-ptr
- :start2 name-start
- :end2 name-end)
- (let ((kind (unix-file-kind (if (zerop name-end) "/" result) t)))
- (unless kind (return nil))
- (cond ((eq kind :link)
- (multiple-value-bind (link err) (unix-readlink result)
- (unless link
- (error 'simple-file-error
- :pathname pathname
- :format-control
- "~@<error reading link ~S: ~2I~_~A~:>"
- :format-arguments (list (subseq
- result 0 fill-ptr)
- (strerror err))))
- (cond ((or (zerop (length link))
- (char/= (schar link 0) #\/))
- ;; It's a relative link.
- (fill result (code-char 0)
- :start fill-ptr
- :end new-fill-ptr))
- ((string= result "/../" :end1 4)
- ;; It's across the super-root.
- (let ((slash (or (position #\/ result :start 4)
- 0)))
- (fill result (code-char 0)
- :start slash
- :end new-fill-ptr)
- (setf fill-ptr slash)))
- (t
- ;; It's absolute.
- (and (> (length link) 0)
- (char= (schar link 0) #\/))
- (fill result (code-char 0) :end new-fill-ptr)
- (setf fill-ptr 0)))
- (setf pending
- (if (= name-end len)
- link
- (concatenate 'simple-string
- link
- (subseq pending name-end))))
- (setf len (length pending))
- (setf name-start 0)))
- ((= name-end len)
- (return (subseq result 0 new-fill-ptr)))
- ((eq kind :directory)
- (setf (schar result new-fill-ptr) #\/)
- (setf fill-ptr (1+ new-fill-ptr))
- (setf name-start (1+ name-end)))
- (t
- (return nil))))))))))
+ (declare (type simple-string pathname))
+ (aver (not (relative-unix-pathname? pathname)))
+ (/show "entering UNIX-RESOLVE-LINKS")
+ (loop with previous-pathnames = nil do
+ (/show pathname previous-pathnames)
+ (let ((link (unix-readlink pathname)))
+ (/show link)
+ ;; Unlike the old CMU CL code, we handle a broken symlink by
+ ;; returning the link itself. That way, CL:TRUENAME on a
+ ;; broken link returns the link itself, so that CL:DIRECTORY
+ ;; can return broken links, so that even without
+ ;; Unix-specific extensions to do interesting things with
+ ;; them, at least Lisp programs can see them and, if
+ ;; necessary, delete them. (This is handy e.g. when your
+ ;; managed-by-Lisp directories are visited by Emacs, which
+ ;; creates broken links as notes to itself.)
+ (if (null link)
+ (return pathname)
+ (let ((new-pathname
+ (unix-simplify-pathname
+ (if (relative-unix-pathname? link)
+ (let* ((dir-len (1+ (position #\/
+ pathname
+ :from-end t)))
+ (dir (subseq pathname 0 dir-len)))
+ (/show dir)
+ (concatenate 'string dir link))
+ link))))
+ (if (unix-file-kind new-pathname)
+ (setf pathname new-pathname)
+ (return pathname)))))
+ ;; To generalize the principle that even if portable Lisp code
+ ;; can't do anything interesting with a broken symlink, at
+ ;; least it should be able to see and delete it, when we
+ ;; detect a cyclic link, we return the link itself. (So even
+ ;; though portable Lisp code can't do anything interesting
+ ;; with a cyclic link, at least it can see it and delete it.)
+ (if (member pathname previous-pathnames :test #'string=)
+ (return pathname)
+ (push pathname previous-pathnames))))
(defun unix-simplify-pathname (src)
- (declare (simple-string src))
+ (declare (type simple-string src))
(let* ((src-len (length src))
(dst (make-string src-len))
(dst-len 0)
(dots 0)
(last-slash nil))
(macrolet ((deposit (char)
- `(progn
- (setf (schar dst dst-len) ,char)
- (incf dst-len))))
+ `(progn
+ (setf (schar dst dst-len) ,char)
+ (incf dst-len))))
(dotimes (src-index src-len)
(let ((char (schar src src-index)))
(cond ((char= char #\.)
((char= char #\/)
(case dots
(0
- ;; Either ``/...' or ``...//...'
+ ;; either ``/...' or ``...//...'
(unless last-slash
(setf last-slash dst-len)
(deposit char)))
(1
- ;; Either ``./...'' or ``..././...''
+ ;; either ``./...'' or ``..././...''
(decf dst-len))
(2
;; We've found ..
(setf last-slash dst-len)
(deposit char))))
(t
- ;; Something other than a dot between slashes.
+ ;; something other than a dot between slashes
(setf last-slash dst-len)
(deposit char)))
(setf dots 0))
projects / sbcl.git / blobdiff