X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Funix.lisp;h=95f8fb12916e74fcf6ef7f1da71f6a34c640ee76;hb=4898ef32c639b1c7f4ee13a5ba566ce6debd03e6;hp=a6b01bed2fb489f05b497a1acd71664193822d8f;hpb=3aba91516068375e01ffec0d19bf8cbe85feb828;p=sbcl.git diff --git a/src/code/unix.lisp b/src/code/unix.lisp index a6b01be..95f8fb1 100644 --- a/src/code/unix.lisp +++ b/src/code/unix.lisp @@ -1,8 +1,9 @@ -;;;; This file contains Unix support that SBCL needs to implement itself. It's -;;;; derived from Peter Van Eynde's unix-glibc2.lisp for CMU CL, which was -;;;; derived from CMU CL unix.lisp 1.56. But those files aspired to be complete -;;;; Unix interfaces exported to the end user, while this file aims to be as -;;;; simple as possible and is not intended for the end user. +;;;; This file contains Unix support that SBCL needs to implement +;;;; itself. It's derived from Peter Van Eynde's unix-glibc2.lisp for +;;;; CMU CL, which was derived from CMU CL unix.lisp 1.56. But those +;;;; files aspired to be complete Unix interfaces exported to the end +;;;; user, while this file aims to be as simple as possible and is not +;;;; intended for the end user. ;;;; ;;;; FIXME: The old CMU CL unix.lisp code was implemented as hand ;;;; transcriptions from Unix headers into Lisp. It appears that this was as @@ -24,50 +25,29 @@ (in-package "SB!UNIX") -(file-comment - "$Header$") - (/show0 "unix.lisp 21") -;;;; common machine-independent structures - -(eval-when (:compile-toplevel :execute) - -(defparameter *compiler-unix-errors* nil) - -(/show0 "unix.lisp 29") - -(sb!xc:defmacro def-unix-error (name number description) - `(progn - (eval-when (:compile-toplevel :execute) - (push (cons ,number ,description) *compiler-unix-errors*)) - (eval-when (:compile-toplevel :load-toplevel :execute) - (defconstant ,name ,number ,description)))) - -(sb!xc:defmacro emit-unix-errors () - (let* ((max (apply #'max (mapcar #'car *compiler-unix-errors*))) - (array (make-array (1+ max) :initial-element nil))) - (dolist (error *compiler-unix-errors*) - (setf (svref array (car error)) (cdr error))) - `(progn - (defvar *unix-errors* ',array) - (proclaim '(simple-vector *unix-errors*))))) - -) ; EVAL-WHEN - -(defvar *unix-errors*) - -(/show0 "unix.lisp 52") - (defmacro def-enum (inc cur &rest names) (flet ((defform (name) - (prog1 (when name `(defconstant ,name ,cur)) - (setf cur (funcall inc cur 1))))) + (prog1 (when name `(defconstant ,name ,cur)) + (setf cur (funcall inc cur 1))))) `(progn ,@(mapcar #'defform names)))) + +;;; Given a C-level zero-terminated array of C strings, return a +;;; corresponding Lisp-level list of SIMPLE-STRINGs. +(defun c-strings->string-list (c-strings) + (declare (type (alien (* c-string)) c-strings)) + (let ((reversed-result nil)) + (dotimes (i most-positive-fixnum (error "argh! can't happen")) + (declare (type index i)) + (let ((c-string (deref c-strings i))) + (if c-string + (push c-string reversed-result) + (return (nreverse reversed-result))))))) ;;;; Lisp types used by syscalls -(deftype unix-pathname () 'simple-string) +(deftype unix-pathname () 'simple-base-string) (deftype unix-fd () `(integer 0 ,most-positive-fixnum)) (deftype unix-file-mode () '(unsigned-byte 32)) @@ -77,40 +57,32 @@ ;;;; system calls -(def-alien-routine ("os_get_errno" get-errno) integer - "Return the value of the C library pseudo-variable named \"errno\".") - (/show0 "unix.lisp 74") -(defun get-unix-error-msg (&optional (error-number (get-errno))) - #!+sb-doc - "Returns a string describing the error number which was returned by a - UNIX system call." - (declare (type integer error-number)) - (if (array-in-bounds-p *unix-errors* error-number) - (svref *unix-errors* error-number) - (format nil "unknown error [~D]" error-number))) - ;;; FIXME: The various FOO-SYSCALL-BAR macros, and perhaps some other ;;; macros in this file, are only used in this file, and could be ;;; implemented using SB!XC:DEFMACRO wrapped in EVAL-WHEN. (defmacro syscall ((name &rest arg-types) success-form &rest args) - `(let ((result (alien-funcall (extern-alien ,name (function int ,@arg-types)) - ,@args))) - (if (minusp result) - (values nil (get-errno)) - ,success-form))) - -;;; Like SYSCALL, but if it fails, signal an error instead of returning error -;;; codes. Should only be used for syscalls that will never really get an -;;; error. + `(locally + (declare (optimize (sb!c::float-accuracy 0))) + (let ((result (alien-funcall (extern-alien ,name (function int ,@arg-types)) + ,@args))) + (if (minusp result) + (values nil (get-errno)) + ,success-form)))) + +;;; This is like SYSCALL, but if it fails, signal an error instead of +;;; returning error codes. Should only be used for syscalls that will +;;; never really get an error. (defmacro syscall* ((name &rest arg-types) success-form &rest args) - `(let ((result (alien-funcall (extern-alien ,name (function int ,@arg-types)) - ,@args))) - (if (minusp result) - (error "Syscall ~A failed: ~A" ,name (get-unix-error-msg)) - ,success-form))) + `(locally + (declare (optimize (sb!c::float-accuracy 0))) + (let ((result (alien-funcall (extern-alien ,name (function int ,@arg-types)) + ,@args))) + (if (minusp result) + (error "Syscall ~A failed: ~A" ,name (strerror)) + ,success-form)))) (/show0 "unix.lisp 109") @@ -119,1180 +91,900 @@ (defmacro int-syscall ((name &rest arg-types) &rest args) `(syscall (,name ,@arg-types) (values result 0) ,@args)) + +(defmacro with-restarted-syscall ((&optional (value (gensym)) + (errno (gensym))) + syscall-form &rest body) + #!+sb-doc + "Evaluate BODY with VALUE and ERRNO bound to the return values of +SYSCALL-FORM. Repeat evaluation of SYSCALL-FORM if it is interrupted." + `(let (,value ,errno) + (loop (multiple-value-setq (,value ,errno) + ,syscall-form) + (unless (eql ,errno sb!unix:eintr) + (return (values ,value ,errno)))) + ,@body)) -;;; from stdio.h +;;;; hacking the Unix environment -(/show0 "unix.lisp 124") +(define-alien-routine ("getenv" posix-getenv) c-string + "Return the \"value\" part of the environment string \"name=value\" which + corresponds to NAME, or NIL if there is none." + (name c-string)) + +;;; from stdio.h +;;; Rename the file with string NAME1 to the string NAME2. NIL and an +;;; error code is returned if an error occurs. (defun unix-rename (name1 name2) - #!+sb-doc - "Unix-rename renames the file with string name1 to the string - name2. NIL and an error code is returned if an error occurs." (declare (type unix-pathname name1 name2)) (void-syscall ("rename" c-string c-string) name1 name2)) -;;; from stdlib.h - -(def-alien-routine ("getenv" posix-getenv) c-string - "Return the environment string \"name=value\" which corresponds to NAME, or - NIL if there is none." - (name c-string)) - ;;; from sys/types.h and gnu/types.h -(/show0 "unix.lisp 144") - -(defconstant +max-s-long+ 2147483647) -(defconstant +max-u-long+ 4294967295) - -;;; FIXME: Isn't there some way to use a C wrapper to avoid this hand-copying? -(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 time-t long) -(def-alien-type clock-t - #!+linux long - #!+bsd unsigned-long) -(def-alien-type uid-t unsigned-int) -(def-alien-type ssize-t int) - -(/show0 "unix.lisp 163") - -;;; 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) -(/show0 "unix.lisp 171") - -;;; FIXME: Isn't there some way to use a C wrapper to avoid this hand-copying? -(def-alien-type dev-t - #!+linux uquad-t - #!+bsd unsigned-int) -(def-alien-type uid-t unsigned-int) -(def-alien-type gid-t unsigned-int) -(def-alien-type ino-t - #!+linux unsigned-long - #!+bsd unsigned-int) -(def-alien-type mode-t - #!+linux unsigned-int - #!+bsd unsigned-short) -(def-alien-type nlink-t - #!+linux unsigned-int - #!+bsd unsigned-short) -(/show0 "unix.lisp 190") - -;;; 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 off-t - #!+linux long - #!+bsd quad-t) +(/show0 "unix.lisp 220") + +;;; 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. +(define-alien-type fd-mask unsigned-long) (eval-when (:compile-toplevel :load-toplevel :execute) - (/show0 "unix.lisp 215") (defconstant fd-setsize 1024)) -(/show0 "unix.lisp 217") -(def-alien-type nil +(define-alien-type nil (struct fd-set - (fds-bits (array fd-mask #.(/ fd-setsize 32))))) + (fds-bits (array fd-mask #.(/ fd-setsize + sb!vm:n-machine-word-bits))))) -(/show0 "unix.lisp 223") +(/show0 "unix.lisp 304") -;;;; direntry.h - -(def-alien-type nil - (struct direct - (d-ino long); inode number of entry - (d-off off-t) ; offset of next disk directory entry - (d-reclen unsigned-short) ; length of this record - (d_type unsigned-char) - (d-name (array char 256)))) ; name must be no longer than this -(/show0 "unix.lisp 241") -;;;; dirent.h - -;;; operations on Unix directories - -;;;; FIXME: It might be really nice to implement these in C, so that -;;;; we don't need to do horrible things like hand-copying the -;;;; direntry struct slot types into an alien struct. - -;;; FIXME: DIRECTORY is an external symbol of package CL, so we should use some -;;; other name for this low-level implementation type. -(defstruct directory - name - (dir-struct (required-argument) :type system-area-pointer)) -(/show0 "unix.lisp 258") - -(def!method print-object ((dir directory) stream) - (print-unreadable-object (dir stream :type t) - (prin1 (directory-name dir) stream))) - -(/show0 "unix.lisp 264") -(defun open-dir (pathname) - (declare (type unix-pathname pathname)) - (when (string= pathname "") - (setf pathname ".")) - (let ((kind (unix-file-kind pathname))) - (case kind - (:directory - (let ((dir-struct - (alien-funcall (extern-alien "opendir" - (function system-area-pointer - c-string)) - pathname))) - (if (zerop (sap-int dir-struct)) - (values nil (get-errno)) - (make-directory :name pathname :dir-struct dir-struct)))) - ((nil) - (values nil enoent)) - (t - (values nil enotdir))))) -(/show0 "unix.lisp 286") - -(defun read-dir (dir) - (declare (type directory dir)) - (let ((daddr (alien-funcall (extern-alien "readdir" - (function system-area-pointer - system-area-pointer)) - (directory-dir-struct dir)))) - (declare (type system-area-pointer daddr)) - (if (zerop (sap-int daddr)) - nil - (with-alien ((direct (* (struct direct)) daddr)) - (values (cast (slot direct 'd-name) c-string) - (slot direct 'd-ino)))))) - -(/show0 "unix.lisp 301") -(defun close-dir (dir) - (declare (type directory dir)) - (alien-funcall (extern-alien "closedir" - (function void system-area-pointer)) - (directory-dir-struct dir)) - nil) - -;;; dlfcn.h -> in foreign.lisp - -;;; fcntl.h -;;; -;;; POSIX Standard: 6.5 File Control Operations - -(/show0 "unix.lisp 318") -(defconstant r_ok 4 #!+sb-doc "Test for read permission") -(defconstant w_ok 2 #!+sb-doc "Test for write permission") -(defconstant x_ok 1 #!+sb-doc "Test for execute permission") -(defconstant f_ok 0 #!+sb-doc "Test for presence of file") +;;;; fcntl.h +;;;; +;;;; POSIX Standard: 6.5 File Control Operations -(/show0 "unix.lisp 352") +;;; Open the file whose pathname is specified by PATH for reading +;;; and/or writing as specified by the FLAGS argument. Various FLAGS +;;; masks (O_RDONLY etc.) are defined in fcntlbits.h. +;;; +;;; If the O_CREAT flag is specified, then the file is created with a +;;; permission of argument MODE if the file doesn't exist. An integer +;;; file descriptor is returned by UNIX-OPEN. (defun unix-open (path flags mode) - #!+sb-doc - "Unix-open opens the file whose pathname is specified by path - for reading and/or writing as specified by the flags argument. - The flags argument can be: - - o_rdonly Read-only flag. - o_wronly Write-only flag. - o_rdwr Read-and-write flag. - o_append Append flag. - o_creat Create-if-nonexistent flag. - o_trunc Truncate-to-size-0 flag. - o_excl Error if the file allready exists - o_noctty Don't assign controlling tty - o_ndelay Non-blocking I/O - o_sync Synchronous I/O - o_async Asynchronous I/O - - If the o_creat flag is specified, then the file is created with - a permission of argument mode if the file doesn't exist. An - integer file descriptor is returned by unix-open." (declare (type unix-pathname path) - (type fixnum flags) - (type unix-file-mode mode)) + (type fixnum flags) + (type unix-file-mode mode)) (int-syscall ("open" c-string int int) path flags mode)) ;;; UNIX-CLOSE accepts a file descriptor and attempts to close the file ;;; associated with it. (/show0 "unix.lisp 391") (defun unix-close (fd) - #!+sb-doc - "Unix-close takes an integer file descriptor as an argument and - closes the file associated with it. T is returned upon successful - completion, otherwise NIL and an error number." (declare (type unix-fd fd)) (void-syscall ("close" int) fd)) -;;; fcntlbits.h -(eval-when (:compile-toplevel :load-toplevel :execute) - -(/show0 "unix.lisp 337") -(defconstant o_rdonly 0) ; read-only flag -(defconstant o_wronly 1) ; write-only flag -(defconstant o_rdwr 2) ; read/write flag -(defconstant o_accmode 3) ; access mode mask -(defconstant o_creat ; create-if-nonexistent flag (not fcntl) - #!+linux #o100 - #!+bsd #x0200) -(/show0 "unix.lisp 345") -(defconstant o_excl ; error if already exists (not fcntl) - #!+linux #o200 - #!+bsd #x0800) -(defconstant o_noctty ; Don't assign controlling tty. (not fcntl) - #!+linux #o400 - #!+bsd #x8000) -(defconstant o_trunc ; truncation flag (not fcntl) - #!+linux #o1000 - #!+bsd #x0400) -(defconstant o_append ; append flag - #!+linux #o2000 - #!+bsd #x0008) -(/show0 "unix.lisp 361") -) ; EVAL-WHEN - ;;;; timebits.h ;; A time value that is accurate to the nearest ;; microsecond but also has a range of years. -(def-alien-type nil +(define-alien-type nil (struct timeval - (tv-sec time-t) ; seconds - (tv-usec time-t))) ; and microseconds + (tv-sec time-t) ; seconds + (tv-usec time-t))) ; and microseconds ;;;; resourcebits.h -(defconstant rusage_self 0 #!+sb-doc "The calling process.") -(defconstant rusage_children -1 #!+sb-doc "Terminated child processes.") +(defconstant rusage_self 0) ; the calling process +(defconstant rusage_children -1) ; terminated child processes (defconstant rusage_both -2) -(def-alien-type nil +(define-alien-type nil (struct rusage - (ru-utime (struct timeval)) ; user time used - (ru-stime (struct timeval)) ; system time used. - (ru-maxrss long) ; Maximum resident set size (in kilobytes) - (ru-ixrss long) ; integral shared memory size - (ru-idrss long) ; integral unshared data size - (ru-isrss long) ; integral unshared stack size - (ru-minflt long) ; page reclaims - (ru-majflt long) ; page faults - (ru-nswap long) ; swaps - (ru-inblock long) ; block input operations - (ru-oublock long) ; block output operations - (ru-msgsnd long) ; messages sent - (ru-msgrcv long) ; messages received - (ru-nsignals long) ; signals received - (ru-nvcsw long) ; voluntary context switches - (ru-nivcsw long))) ; involuntary context switches - -;;;; statbuf.h - -;;; FIXME: This should go into C code so that we don't need to hand-copy -;;; it from header files. -#!+Linux -(def-alien-type nil - (struct stat - (st-dev dev-t) - (st-pad1 unsigned-short) - (st-ino ino-t) - (st-mode mode-t) - (st-nlink nlink-t) - (st-uid uid-t) - (st-gid gid-t) - (st-rdev dev-t) - (st-pad2 unsigned-short) - (st-size off-t) - (st-blksize unsigned-long) - (st-blocks unsigned-long) - (st-atime time-t) - (unused-1 unsigned-long) - (st-mtime time-t) - (unused-2 unsigned-long) - (st-ctime time-t) - (unused-3 unsigned-long) - (unused-4 unsigned-long) - (unused-5 unsigned-long))) - -#!+bsd -(def-alien-type nil - (struct timespec-t - (tv-sec long) - (tv-nsec long))) - -#!+bsd -(def-alien-type nil - (struct stat - (st-dev dev-t) - (st-ino ino-t) - (st-mode mode-t) - (st-nlink nlink-t) - (st-uid uid-t) - (st-gid gid-t) - (st-rdev dev-t) - (st-atime (struct timespec-t)) - (st-mtime (struct timespec-t)) - (st-ctime (struct timespec-t)) - (st-size unsigned-long) ; really quad - (st-sizeh unsigned-long) ; - (st-blocks unsigned-long) ; really quad - (st-blocksh unsigned-long) - (st-blksize unsigned-long) - (st-flags unsigned-long) - (st-gen unsigned-long) - (st-lspare long) - (st-qspare (array long 4)) - )) - -;; encoding of the file mode - -(defconstant s-ifmt #o0170000 #!+sb-doc "These bits determine file type.") - -;; file types -(defconstant s-ififo #o0010000 #!+sb-doc "FIFO") -(defconstant s-ifchr #o0020000 #!+sb-doc "Character device") -(defconstant s-ifdir #o0040000 #!+sb-doc "Directory") -(defconstant s-ifblk #o0060000 #!+sb-doc "Block device") -(defconstant s-ifreg #o0100000 #!+sb-doc "Regular file") - -;; These don't actually exist on System V, but having them doesn't hurt. -(defconstant s-iflnk #o0120000 #!+sb-doc "Symbolic link.") -(defconstant s-ifsock #o0140000 #!+sb-doc "Socket.") + (ru-utime (struct timeval)) ; user time used + (ru-stime (struct timeval)) ; system time used. + (ru-maxrss long) ; maximum resident set size (in kilobytes) + (ru-ixrss long) ; integral shared memory size + (ru-idrss long) ; integral unshared data size + (ru-isrss long) ; integral unshared stack size + (ru-minflt long) ; page reclaims + (ru-majflt long) ; page faults + (ru-nswap long) ; swaps + (ru-inblock long) ; block input operations + (ru-oublock long) ; block output operations + (ru-msgsnd long) ; messages sent + (ru-msgrcv long) ; messages received + (ru-nsignals long) ; signals received + (ru-nvcsw long) ; voluntary context switches + (ru-nivcsw long))) ; involuntary context switches ;;;; unistd.h -;;; values for the second argument to access +;;; Given a file path (a string) and one of four constant modes, +;;; return T if the file is accessible with that mode and NIL if not. +;;; When NIL, also return an errno value with NIL which tells why the +;;; file was not accessible. +;;; +;;; The access modes are: +;;; r_ok Read permission. +;;; w_ok Write permission. +;;; x_ok Execute permission. +;;; f_ok Presence of file. (defun unix-access (path mode) - #!+sb-doc - "Given a file path (a string) and one of four constant modes, - UNIX-ACCESS returns T if the file is accessible with that - mode and NIL if not. It also returns an errno value with - NIL which determines why the file was not accessible. - - The access modes are: - r_ok Read permission. - w_ok Write permission. - x_ok Execute permission. - f_ok Presence of file." (declare (type unix-pathname path) - (type (mod 8) mode)) + (type (mod 8) mode)) (void-syscall ("access" c-string int) path mode)) -(defconstant l_set 0 #!+sb-doc "set the file pointer") -(defconstant l_incr 1 #!+sb-doc "increment the file pointer") -(defconstant l_xtnd 2 #!+sb-doc "extend the file size") +;;; values for the second argument to UNIX-LSEEK +(defconstant l_set 0) ; to set the file pointer +(defconstant l_incr 1) ; to increment the file pointer +(defconstant l_xtnd 2) ; to extend the file size + +;;; Is a stream interactive? +(defun unix-isatty (fd) + (declare (type unix-fd fd)) + (int-syscall ("isatty" int) fd)) (defun unix-lseek (fd offset whence) - #!+sb-doc - "Unix-lseek accepts a file descriptor and moves the file pointer ahead - a certain offset for that file. Whence can be any of the following: + "Unix-lseek accepts a file descriptor and moves the file pointer by + OFFSET octets. Whence can be any of the following: - l_set Set the file pointer. - l_incr Increment the file pointer. - l_xtnd Extend the file size. + L_SET Set the file pointer. + L_INCR Increment the file pointer. + L_XTND Extend the file size. " (declare (type unix-fd fd) - (type (unsigned-byte 32) offset) - (type (integer 0 2) whence)) - #!-(and x86 bsd) - (int-syscall ("lseek" int off-t int) fd offset whence) - ;; Need a 64-bit return value type for this. TBD. For now, - ;; don't use this with any 2G+ partitions. - #!+(and x86 bsd) - (int-syscall ("lseek" int unsigned-long unsigned-long int) - fd offset 0 whence)) + (type (integer 0 2) whence)) + (let ((result (alien-funcall (extern-alien "lseek" (function off-t int off-t int)) + fd offset whence))) + (if (minusp result ) + (values nil (get-errno)) + (values result 0)))) ;;; UNIX-READ accepts a file descriptor, a buffer, and the length to read. ;;; It attempts to read len bytes from the device associated with fd ;;; and store them into the buffer. It returns the actual number of ;;; bytes read. (defun unix-read (fd buf len) - #!+sb-doc - "Unix-read attempts to read from the file described by fd into - the buffer buf until it is full. Len is the length of the buffer. - The number of bytes actually read is returned or NIL and an error - number if an error occurred." (declare (type unix-fd fd) - (type (unsigned-byte 32) len)) + (type (unsigned-byte 32) len)) (int-syscall ("read" int (* char) int) fd buf len)) ;;; UNIX-WRITE accepts a file descriptor, a buffer, an offset, and the ;;; length to write. It attempts to write len bytes to the device -;;; associated with fd from the the buffer starting at offset. It returns +;;; associated with fd from the buffer starting at offset. It returns ;;; the actual number of bytes written. (defun unix-write (fd buf offset len) - #!+sb-doc - "Unix-write attempts to write a character buffer (buf) of length - len to the file described by the file descriptor fd. NIL and an - error is returned if the call is unsuccessful." (declare (type unix-fd fd) - (type (unsigned-byte 32) offset len)) + (type (unsigned-byte 32) offset len)) (int-syscall ("write" int (* char) int) - fd - (with-alien ((ptr (* char) (etypecase buf - ((simple-array * (*)) - (vector-sap buf)) - (system-area-pointer - buf)))) - (addr (deref ptr offset))) - len)) - + fd + (with-alien ((ptr (* char) (etypecase buf + ((simple-array * (*)) + (vector-sap buf)) + (system-area-pointer + buf)))) + (addr (deref ptr offset))) + len)) + +;;; Set up a unix-piping mechanism consisting of an input pipe and an +;;; output pipe. Return two values: if no error occurred the first +;;; value is the pipe to be read from and the second is can be written +;;; to. If an error occurred the first value is NIL and the second the +;;; unix error code. (defun unix-pipe () - #!+sb-doc - "Unix-pipe sets up a unix-piping mechanism consisting of - an input pipe and an output pipe. Unix-Pipe returns two - values: if no error occurred the first value is the pipe - to be read from and the second is can be written to. If - an error occurred the first value is NIL and the second - the unix error code." (with-alien ((fds (array int 2))) (syscall ("pipe" (* int)) - (values (deref fds 0) (deref fds 1)) - (cast fds (* int))))) + (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) - #!+sb-doc - "Given a file path string, unix-chdir changes the current working - directory to the one specified." - (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)) -(defun unix-current-directory () - #!+sb-doc - "Return the current directory as a SIMPLE-STRING." - ;; 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)))) +;;; Given a C char* pointer allocated by malloc(), free it and return a +;;; corresponding Lisp string (or return NIL if the pointer is a C NULL). +(defun newcharstar-string (newcharstar) + (declare (type (alien (* char)) newcharstar)) + (if (null-alien newcharstar) + nil + (prog1 + (cast newcharstar c-string) + (free-alien newcharstar)))) + +;;; 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. + ;; + ;; SunOS and OSF/1 provide almost as useful an extension: if given a null + ;; buffer pointer, it will automatically allocate size space. The + ;; KLUDGE in this solution arises because we have just read off + ;; PATH_MAX+1 from the Solaris header files and stuck it in here as + ;; a constant. Going the grovel_headers route doesn't seem to be + ;; helpful, either, as Solaris doesn't export PATH_MAX from + ;; unistd.h. + #!-(or linux openbsd freebsd netbsd sunos osf1 darwin) (,stub,) + #!+(or linux openbsd freebsd netbsd sunos osf1 darwin) + (or (newcharstar-string (alien-funcall (extern-alien "getcwd" + (function (* char) + (* char) + size-t)) + nil + #!+(or linux openbsd freebsd netbsd darwin) 0 + #!+(or sunos osf1) 1025)) + (simple-perror "getcwd"))) + +;;; 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 +;;; number are returned. (defun unix-dup (fd) - #!+sb-doc - "Unix-dup duplicates an existing file descriptor (given as the - argument) and returns it. If FD is not a valid file descriptor, NIL - and an error number are returned." (declare (type unix-fd fd)) (int-syscall ("dup" int) fd)) -;;; UNIX-EXIT terminates a program. +;;; Terminate the current process with an optional error code. If +;;; successful, the call doesn't return. If unsuccessful, the call +;;; returns NIL and an error number. (defun unix-exit (&optional (code 0)) - #!+sb-doc - "Unix-exit terminates the current process with an optional - error code. If successful, the call doesn't return. If - unsuccessful, the call returns NIL and an error number." (declare (type (signed-byte 32) code)) (void-syscall ("exit" int) code)) -(def-alien-routine ("getpid" unix-getpid) int - #!+sb-doc - "Unix-getpid returns the process-id of the current process.") - -(def-alien-routine ("getuid" unix-getuid) int - #!+sb-doc - "Unix-getuid returns the real user-id associated with the - current process.") - +;;; Return the process id of the current process. +(define-alien-routine ("getpid" unix-getpid) int) + +;;; Return the real user id associated with the current process. +(define-alien-routine ("getuid" unix-getuid) int) + +;;; Translate a user id into a login name. +(defun uid-username (uid) + (or (newcharstar-string (alien-funcall (extern-alien "uid_username" + (function (* char) int)) + uid)) + (error "found no match for Unix uid=~S" uid))) + +;;; Return the namestring of the home directory, being careful to +;;; include a trailing #\/ +(defun uid-homedir (uid) + (or (newcharstar-string (alien-funcall (extern-alien "uid_homedir" + (function (* char) int)) + uid)) + (error "failed to resolve home directory for Unix uid=~S" uid))) + +;;; 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) - #!+sb-doc - "Unix-readlink invokes the readlink system call on the file name - specified by the simple string path. It returns up to two values: - the contents of the symbolic link if the call is successful, or - NIL and the Unix error number." (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. (defun unix-unlink (name) - #!+sb-doc - "Unix-unlink removes the directory entry for the named file. - NIL and an error code is returned if the call fails." (declare (type unix-pathname name)) (void-syscall ("unlink" c-string) name)) -(defun %set-tty-process-group (pgrp &optional fd) - #!+sb-doc - "Set the tty-process-group for the unix file-descriptor FD to PGRP. If not - supplied, FD defaults to /dev/tty." - (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 () - #!+sb-doc - "Unix-gethostname returns the name of the host machine as a string." (with-alien ((buf (array char 256))) (syscall ("gethostname" (* char) int) - (cast buf c-string) - (cast buf (* char)) 256))) + (cast buf c-string) + (cast buf (* char)) 256))) + +(defun unix-setsid () + (int-syscall ("setsid"))) -(defun unix-fsync (fd) - #!+sb-doc - "Unix-fsync writes the core image of the file described by - fd to disk." - (declare (type unix-fd fd)) - (void-syscall ("fsync" int) fd)) - ;;;; sys/ioctl.h +;;; UNIX-IOCTL performs a variety of operations on open i/o +;;; descriptors. See the UNIX Programmer's Manual for more +;;; information. (defun unix-ioctl (fd cmd arg) - #!+sb-doc - "Unix-ioctl performs a variety of operations on open i/o - descriptors. See the UNIX Programmer's Manual for more - information." (declare (type unix-fd fd) - (type (unsigned-byte 32) cmd)) - (void-syscall ("ioctl" int unsigned-int (* char)) fd cmd arg)) + (type (signed-byte 32) cmd)) + (void-syscall ("ioctl" int int (* char)) fd cmd arg)) ;;;; sys/resource.h ;;; FIXME: All we seem to need is the RUSAGE_SELF version of this. +;;; +;;; This is like getrusage(2), except it returns only the system and +;;; user time, and returns the seconds and microseconds as separate +;;; values. #!-sb-fluid (declaim (inline unix-fast-getrusage)) (defun unix-fast-getrusage (who) - #!+sb-doc - "Like call getrusage, but return only the system and user time, and returns - the seconds and microseconds as separate values." (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 - (slot (slot usage 'ru-utime) 'tv-sec) - (slot (slot usage 'ru-utime) 'tv-usec) - (slot (slot usage 'ru-stime) 'tv-sec) - (slot (slot usage 'ru-stime) 'tv-usec)) - who (addr usage)))) - + (values t + (slot (slot usage 'ru-utime) 'tv-sec) + (slot (slot usage 'ru-utime) 'tv-usec) + (slot (slot usage 'ru-stime) 'tv-sec) + (slot (slot usage 'ru-stime) 'tv-usec)) + who (addr usage)))) + +;;; Return information about the resource usage of the process +;;; specified by WHO. WHO can be either the current process +;;; (rusage_self) or all of the terminated child processes +;;; (rusage_children). NIL and an error number is returned if the call +;;; fails. (defun unix-getrusage (who) - #!+sb-doc - "Unix-getrusage returns information about the resource usage - of the process specified by who. Who can be either the - current process (rusage_self) or all of the terminated - child processes (rusage_children). NIL and an error number - is returned if the call fails." (with-alien ((usage (struct rusage))) (syscall ("getrusage" int (* (struct rusage))) - (values t - (+ (* (slot (slot usage 'ru-utime) 'tv-sec) 1000000) - (slot (slot usage 'ru-utime) 'tv-usec)) - (+ (* (slot (slot usage 'ru-stime) 'tv-sec) 1000000) - (slot (slot usage 'ru-stime) 'tv-usec)) - (slot usage 'ru-maxrss) - (slot usage 'ru-ixrss) - (slot usage 'ru-idrss) - (slot usage 'ru-isrss) - (slot usage 'ru-minflt) - (slot usage 'ru-majflt) - (slot usage 'ru-nswap) - (slot usage 'ru-inblock) - (slot usage 'ru-oublock) - (slot usage 'ru-msgsnd) - (slot usage 'ru-msgrcv) - (slot usage 'ru-nsignals) - (slot usage 'ru-nvcsw) - (slot usage 'ru-nivcsw)) - who (addr usage)))) - + (values t + (+ (* (slot (slot usage 'ru-utime) 'tv-sec) 1000000) + (slot (slot usage 'ru-utime) 'tv-usec)) + (+ (* (slot (slot usage 'ru-stime) 'tv-sec) 1000000) + (slot (slot usage 'ru-stime) 'tv-usec)) + (slot usage 'ru-maxrss) + (slot usage 'ru-ixrss) + (slot usage 'ru-idrss) + (slot usage 'ru-isrss) + (slot usage 'ru-minflt) + (slot usage 'ru-majflt) + (slot usage 'ru-nswap) + (slot usage 'ru-inblock) + (slot usage 'ru-oublock) + (slot usage 'ru-msgsnd) + (slot usage 'ru-msgrcv) + (slot usage 'ru-nsignals) + (slot usage 'ru-nvcsw) + (slot usage 'ru-nivcsw)) + who (addr usage)))) ;;;; 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) - (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) ) +;;;; 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)) ;; 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)))))) - -;;; Unix-select accepts sets of file descriptors and waits for an event + ;; (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. - (defmacro num-to-fd-set (fdset num) `(if (fixnump ,num) (progn - (setf (deref (slot ,fdset 'fds-bits) 0) ,num) - ,@(loop for index upfrom 1 below (/ fd-setsize 32) - collect `(setf (deref (slot ,fdset 'fds-bits) ,index) 0))) + (setf (deref (slot ,fdset 'fds-bits) 0) ,num) + ,@(loop for index upfrom 1 below (/ fd-setsize + sb!vm:n-machine-word-bits) + collect `(setf (deref (slot ,fdset 'fds-bits) ,index) 0))) (progn - ,@(loop for index upfrom 0 below (/ fd-setsize 32) - collect `(setf (deref (slot ,fdset 'fds-bits) ,index) - (ldb (byte 32 ,(* index 32)) ,num)))))) + ,@(loop for index upfrom 0 below (/ fd-setsize + sb!vm:n-machine-word-bits) + collect `(setf (deref (slot ,fdset 'fds-bits) ,index) + (ldb (byte sb!vm:n-machine-word-bits + ,(* index sb!vm:n-machine-word-bits)) + ,num)))))) (defmacro fd-set-to-num (nfds fdset) - `(if (<= ,nfds 32) + `(if (<= ,nfds sb!vm:n-machine-word-bits) (deref (slot ,fdset 'fds-bits) 0) - (+ ,@(loop for index upfrom 0 below (/ fd-setsize 32) - collect `(ash (deref (slot ,fdset 'fds-bits) ,index) - ,(* index 32)))))) - + (+ ,@(loop for index upfrom 0 below (/ fd-setsize + sb!vm:n-machine-word-bits) + collect `(ash (deref (slot ,fdset 'fds-bits) ,index) + ,(* index sb!vm:n-machine-word-bits)))))) + +;;; Examine the sets of descriptors passed as arguments to see whether +;;; they are ready for reading and writing. See the UNIX Programmer's +;;; Manual for more information. (defun unix-select (nfds rdfds wrfds xpfds to-secs &optional (to-usecs 0)) - #!+sb-doc - "Unix-select examines the sets of descriptors passed as arguments - to see whether they are ready for reading and writing. See the UNIX - Programmers Manual for more information." - (declare (type (integer 0 #.FD-SETSIZE) nfds) - (type unsigned-byte rdfds wrfds xpfds) - (type (or (unsigned-byte 31) null) to-secs) - (type (unsigned-byte 31) to-usecs) - (optimize (speed 3) (safety 0) (inhibit-warnings 3))) + (declare (type (integer 0 #.fd-setsize) nfds) + (type unsigned-byte rdfds wrfds xpfds) + (type (or (unsigned-byte 31) null) to-secs) + (type (unsigned-byte 31) to-usecs) + (optimize (speed 3) (safety 0) (inhibit-warnings 3))) (with-alien ((tv (struct timeval)) - (rdf (struct fd-set)) - (wrf (struct fd-set)) - (xpf (struct fd-set))) + (rdf (struct fd-set)) + (wrf (struct fd-set)) + (xpf (struct fd-set))) (when to-secs (setf (slot tv 'tv-sec) to-secs) - (setf (slot tv 'tv-usec) to-usecs)) + (setf (slot tv 'tv-usec) to-usecs)) (num-to-fd-set rdf rdfds) (num-to-fd-set wrf wrfds) (num-to-fd-set xpf xpfds) (macrolet ((frob (lispvar alienvar) - `(if (zerop ,lispvar) - (int-sap 0) - (alien-sap (addr ,alienvar))))) + `(if (zerop ,lispvar) + (int-sap 0) + (alien-sap (addr ,alienvar))))) (syscall ("select" int (* (struct fd-set)) (* (struct fd-set)) - (* (struct fd-set)) (* (struct timeval))) - (values result - (fd-set-to-num nfds rdf) - (fd-set-to-num nfds wrf) - (fd-set-to-num nfds xpf)) - nfds (frob rdfds rdf) (frob wrfds wrf) (frob xpfds xpf) - (if to-secs (alien-sap (addr tv)) (int-sap 0)))))) + (* (struct fd-set)) (* (struct timeval))) + (values result + (fd-set-to-num nfds rdf) + (fd-set-to-num nfds wrf) + (fd-set-to-num nfds xpf)) + nfds (frob rdfds rdf) (frob wrfds wrf) (frob xpfds xpf) + (if to-secs (alien-sap (addr tv)) (int-sap 0)))))) ;;;; sys/stat.h -;;; FIXME: This is only used in this file, and needn't be in target Lisp -;;; runtime. It's also unclear why it needs to be a macro instead of a -;;; function. Perhaps it should become a FLET. -(defmacro extract-stat-results (buf) - `(values T - #!+bsd - (slot ,buf 'st-dev) - #!+linux - (+ (deref (slot ,buf 'st-dev) 0) - (* (+ +max-u-long+ 1) - (deref (slot ,buf 'st-dev) 1))) ;;; let's hope this works.. - (slot ,buf 'st-ino) - (slot ,buf 'st-mode) - (slot ,buf 'st-nlink) - (slot ,buf 'st-uid) - (slot ,buf 'st-gid) - #!+bsd - (slot ,buf 'st-rdev) - #!+linux - (+ (deref (slot ,buf 'st-rdev) 0) - (* (+ +max-u-long+ 1) - (deref (slot ,buf 'st-rdev) 1))) ;;; let's hope this works.. - #!+linux (slot ,buf 'st-size) - #!+bsd - (+ (slot ,buf 'st-size) - (* (+ +max-u-long+ 1) - (slot ,buf 'st-sizeh))) - #!+linux (slot ,buf 'st-atime) - #!+bsd (slot (slot ,buf 'st-atime) 'tv-sec) - #!+linux (slot ,buf 'st-mtime) - #!+bsd (slot (slot ,buf 'st-mtime) 'tv-sec) - #!+linux (slot ,buf 'st-ctime) - #!+bsd (slot (slot ,buf 'st-ctime) 'tv-sec) - (slot ,buf 'st-blksize) - #!+linux (slot ,buf 'st-blocks) - #!+bsd - (+ (slot ,buf 'st-blocks) - (* (+ +max-u-long+ 1) - (slot ,buf 'st-blocksh))) - )) +;;; This is a structure defined in src/runtime/wrap.c, to look +;;; basically like "struct stat" according to stat(2). It may not +;;; actually correspond to the real in-memory stat structure that the +;;; syscall uses, and that's OK. Linux in particular is packed full of +;;; stat macros, and trying to keep Lisp code in correspondence with +;;; it is more pain than it's worth, so we just let our C runtime +;;; synthesize a nice consistent structure for us. +;;; +;;; 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. 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?":-| +(define-alien-type nil + (struct wrapped_stat + (st-dev unsigned-int) ; 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-int) ; would be dev-t in a real stat + (st-size unsigned-int) ; would be off-t in a real stat + (st-blksize unsigned-long) + (st-blocks unsigned-long) + (st-atime time-t) + (st-mtime time-t) + (st-ctime 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))) wrapped-stat)) + (values t + (slot wrapped-stat 'st-dev) + (slot wrapped-stat 'st-ino) + (slot wrapped-stat 'st-mode) + (slot wrapped-stat 'st-nlink) + (slot wrapped-stat 'st-uid) + (slot wrapped-stat 'st-gid) + (slot wrapped-stat 'st-rdev) + (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))) + +;;; 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() (defun unix-stat (name) - #!+sb-doc - "Unix-stat retrieves information about the specified - file returning them in the form of multiple values. - See the UNIX Programmer's Manual for a description - of the values returned. If the call fails, then NIL - and an error number is returned instead." (declare (type unix-pathname name)) - (when (string= name "") - (setf name ".")) - (with-alien ((buf (struct stat))) - (syscall ("stat" c-string (* (struct stat))) - (extract-stat-results buf) - name (addr buf)))) - -(defun unix-fstat (fd) - #!+sb-doc - "Unix-fstat is similar to unix-stat except the file is specified - by the file descriptor fd." - (declare (type unix-fd fd)) - (with-alien ((buf (struct stat))) - (syscall ("fstat" int (* (struct stat))) - (extract-stat-results buf) - fd (addr buf)))) - + (with-alien ((buf (struct wrapped_stat))) + (syscall ("stat_wrapper" c-string (* (struct wrapped_stat))) + (%extract-stat-results (addr buf)) + name (addr buf)))) (defun unix-lstat (name) - #!+sb-doc - "Unix-lstat is similar to unix-stat except the specified - file must be a symbolic link." (declare (type unix-pathname name)) - (with-alien ((buf (struct stat))) - (syscall ("lstat" c-string (* (struct stat))) - (extract-stat-results buf) - name (addr buf)))) - -;;; UNIX-MKDIR accepts a name and a mode and attempts to create the -;;; corresponding directory with mode mode. -(defun unix-mkdir (name mode) - #!+sb-doc - "Unix-mkdir creates a new directory with the specified name and mode. - (Same as those for unix-fchmod.) It returns T upon success, otherwise - NIL and an error number." - (declare (type unix-pathname name) - (type unix-file-mode mode)) - (void-syscall ("mkdir" c-string int) name mode)) + (with-alien ((buf (struct wrapped_stat))) + (syscall ("lstat_wrapper" c-string (* (struct wrapped_stat))) + (%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 (addr buf)) + fd (addr buf)))) ;;;; time.h -;; POSIX.4 structure for a time value. This is like a `struct timeval' but -;; has nanoseconds instead of microseconds. - -(def-alien-type nil +;; the POSIX.4 structure for a time value. This is like a "struct +;; timeval" but has nanoseconds instead of microseconds. +(define-alien-type nil (struct timespec - (tv-sec long) ;Seconds - (tv-nsec long))) ;Nanoseconds + (tv-sec long) ; seconds + (tv-nsec long))) ; nanoseconds -;; Used by other time functions. -(def-alien-type nil +;; used by other time functions +(define-alien-type nil (struct tm - (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. - -(def-alien-routine get-timezone sb!c-call:void - (when sb!c-call:long :in) - (minutes-west sb!c-call:int :out) + (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. + +(define-alien-routine get-timezone sb!alien:void + (when sb!alien:long :in) + (seconds-west sb!alien:int :out) (daylight-savings-p sb!alien:boolean :out)) -(defun unix-get-minutes-west (secs) - (multiple-value-bind (ignore minutes dst) (get-timezone secs) +(defun nanosleep (secs nsecs) + (with-alien ((req (struct timespec)) + (rem (struct timespec))) + (setf (slot req 'tv-sec) secs) + (setf (slot req 'tv-nsec) nsecs) + (loop while (eql sb!unix:eintr + (nth-value 1 + (int-syscall ("nanosleep" (* (struct timespec)) + (* (struct timespec))) + (addr req) (addr rem)))) + do (rotatef req rem)))) + +(defun unix-get-seconds-west (secs) + (multiple-value-bind (ignore seconds dst) (get-timezone secs) (declare (ignore ignore) (ignore dst)) - (values minutes))) - -(defun unix-get-timezone (secs) - (multiple-value-bind (ignore minutes dst) (get-timezone secs) - (declare (ignore ignore) (ignore minutes)) - (values (deref unix-tzname (if dst 1 0))))) - + (values seconds))) ;;;; sys/time.h ;;; Structure crudely representing a timezone. KLUDGE: This is ;;; obsolete and should never be used. -(def-alien-type nil +(define-alien-type nil (struct timezone - (tz-minuteswest int) ; minutes west of Greenwich - (tz-dsttime int))) ; type of dst correction + (tz-minuteswest int) ; minutes west of Greenwich + (tz-dsttime int))) ; type of dst correction +;;; If it works, UNIX-GETTIMEOFDAY returns 5 values: T, the seconds +;;; and microseconds of the current time of day, the timezone (in +;;; minutes west of Greenwich), and a daylight-savings flag. If it +;;; doesn't work, it returns NIL and the errno. #!-sb-fluid (declaim (inline unix-gettimeofday)) (defun unix-gettimeofday () - #!+sb-doc - "If it works, unix-gettimeofday returns 5 values: T, the seconds and - microseconds of the current time of day, the timezone (in minutes west - of Greenwich), and a daylight-savings flag. If it doesn't work, it - returns NIL and the errno." (with-alien ((tv (struct timeval)) - (tz (struct timezone))) + (tz (struct timezone))) (syscall* ("gettimeofday" (* (struct timeval)) - (* (struct timezone))) - (values T - (slot tv 'tv-sec) - (slot tv 'tv-usec) - (slot tz 'tz-minuteswest) - (slot tz 'tz-dsttime)) - (addr tv) - (addr tz)))) + (* (struct timezone))) + (values t + (slot tv 'tv-sec) + (slot tv 'tv-usec) + (slot tz 'tz-minuteswest) + (slot tz 'tz-dsttime)) + (addr tv) + (addr tz)))) + + +;; Type of the second argument to `getitimer' and +;; the second and third arguments `setitimer'. +(define-alien-type nil + (struct itimerval + (it-interval (struct timeval)) ; timer interval + (it-value (struct timeval)))) ; current value + +(defconstant itimer-real 0) +(defconstant itimer-virtual 1) +(defconstant itimer-prof 2) + +(defun unix-getitimer (which) + "Unix-getitimer returns the INTERVAL and VALUE slots of one of + three system timers (:real :virtual or :profile). On success, + unix-getitimer returns 5 values, + T, it-interval-secs, it-interval-usec, it-value-secs, it-value-usec." + (declare (type (member :real :virtual :profile) which) + (values t + (unsigned-byte 29) (mod 1000000) + (unsigned-byte 29) (mod 1000000))) + (let ((which (ecase which + (:real itimer-real) + (:virtual itimer-virtual) + (:profile itimer-prof)))) + (with-alien ((itv (struct itimerval))) + (syscall* ("getitimer" int (* (struct itimerval))) + (values t + (slot (slot itv 'it-interval) 'tv-sec) + (slot (slot itv 'it-interval) 'tv-usec) + (slot (slot itv 'it-value) 'tv-sec) + (slot (slot itv 'it-value) 'tv-usec)) + which (alien-sap (addr itv)))))) + +(defun unix-setitimer (which int-secs int-usec val-secs val-usec) + " Unix-setitimer sets the INTERVAL and VALUE slots of one of + three system timers (:real :virtual or :profile). A SIGALRM signal + will be delivered VALUE from now. INTERVAL, + when non-zero, is to be loaded each time + the timer expires. Setting INTERVAL and VALUE to zero disables + the timer. See the Unix man page for more details. On success, + unix-setitimer returns the old contents of the INTERVAL and VALUE + slots as in unix-getitimer." + (declare (type (member :real :virtual :profile) which) + (type (unsigned-byte 29) int-secs val-secs) + (type (integer 0 (1000000)) int-usec val-usec) + (values t + (unsigned-byte 29) (mod 1000000) + (unsigned-byte 29) (mod 1000000))) + (let ((which (ecase which + (:real itimer-real) + (:virtual itimer-virtual) + (:profile itimer-prof)))) + (with-alien ((itvn (struct itimerval)) + (itvo (struct itimerval))) + (setf (slot (slot itvn 'it-interval) 'tv-sec ) int-secs + (slot (slot itvn 'it-interval) 'tv-usec) int-usec + (slot (slot itvn 'it-value ) 'tv-sec ) val-secs + (slot (slot itvn 'it-value ) 'tv-usec) val-usec) + (syscall* ("setitimer" int (* (struct timeval))(* (struct timeval))) + (values t + (slot (slot itvo 'it-interval) 'tv-sec) + (slot (slot itvo 'it-interval) 'tv-usec) + (slot (slot itvo 'it-value) 'tv-sec) + (slot (slot itvo 'it-value) 'tv-usec)) + which (alien-sap (addr itvn))(alien-sap (addr itvo)))))) + +(defmacro sb!ext:with-timeout (expires &body body) + "Execute the body, interrupting it with a SIGALRM after at least +EXPIRES seconds have passed. Uses Unix setitimer(), restoring any +previous timer after the body has finished executing" + (with-unique-names (saved-seconds saved-useconds s u) + `(let (- ,saved-seconds ,saved-useconds) + (multiple-value-setq (- - - ,saved-seconds ,saved-useconds) + (unix-getitimer :real)) + (multiple-value-bind (,s ,u) (floor ,expires) + (setf ,u (floor (* ,u 1000000))) + (if (and (> ,expires 0) + (or (and (zerop ,saved-seconds) (zerop ,saved-useconds)) + (> ,saved-seconds ,s) + (and (= ,saved-seconds ,s) + (> ,saved-useconds ,u)))) + (unwind-protect + (progn + (unix-setitimer :real 0 0 ,s ,u) + ,@body) + (unix-setitimer :real 0 0 ,saved-seconds ,saved-useconds)) + (progn + ,@body)))))) -;;;; asm/errno.h - -#| -(def-unix-error ESUCCESS 0 "Successful") -(def-unix-error EPERM 1 "Operation not permitted") -|# -(def-unix-error ENOENT 2 "No such file or directory") -#| -(def-unix-error ESRCH 3 "No such process") -|# -(def-unix-error EINTR 4 "Interrupted system call") -(def-unix-error EIO 5 "I/O error") -#| -(def-unix-error ENXIO 6 "No such device or address") -(def-unix-error E2BIG 7 "Arg list too long") -(def-unix-error ENOEXEC 8 "Exec format error") -(def-unix-error EBADF 9 "Bad file number") -(def-unix-error ECHILD 10 "No children") -(def-unix-error EAGAIN 11 "Try again") -(def-unix-error ENOMEM 12 "Out of memory") -|# -(def-unix-error EACCES 13 "Permission denied") -#| -(def-unix-error EFAULT 14 "Bad address") -(def-unix-error ENOTBLK 15 "Block device required") -(def-unix-error EBUSY 16 "Device or resource busy") -|# -(def-unix-error EEXIST 17 "File exists") -#| -(def-unix-error EXDEV 18 "Cross-device link") -(def-unix-error ENODEV 19 "No such device") -|# -(def-unix-error ENOTDIR 20 "Not a directory") -#| -(def-unix-error EISDIR 21 "Is a directory") -(def-unix-error EINVAL 22 "Invalid argument") -(def-unix-error ENFILE 23 "File table overflow") -(def-unix-error EMFILE 24 "Too many open files") -(def-unix-error ENOTTY 25 "Not a typewriter") -(def-unix-error ETXTBSY 26 "Text file busy") -(def-unix-error EFBIG 27 "File too large") -(def-unix-error ENOSPC 28 "No space left on device") -|# -(def-unix-error ESPIPE 29 "Illegal seek") -#| -(def-unix-error EROFS 30 "Read-only file system") -(def-unix-error EMLINK 31 "Too many links") -(def-unix-error EPIPE 32 "Broken pipe") -|# - -#| -;;; Math -(def-unix-error EDOM 33 "Math argument out of domain") -(def-unix-error ERANGE 34 "Math result not representable") -(def-unix-error EDEADLK 35 "Resource deadlock would occur") -(def-unix-error ENAMETOOLONG 36 "File name too long") -(def-unix-error ENOLCK 37 "No record locks available") -(def-unix-error ENOSYS 38 "Function not implemented") -(def-unix-error ENOTEMPTY 39 "Directory not empty") -(def-unix-error ELOOP 40 "Too many symbolic links encountered") -|# -(def-unix-error EWOULDBLOCK 11 "Operation would block") -(/show0 "unix.lisp 3192") -#| -(def-unix-error ENOMSG 42 "No message of desired type") -(def-unix-error EIDRM 43 "Identifier removed") -(def-unix-error ECHRNG 44 "Channel number out of range") -(def-unix-error EL2NSYNC 45 "Level 2 not synchronized") -(def-unix-error EL3HLT 46 "Level 3 halted") -(def-unix-error EL3RST 47 "Level 3 reset") -(def-unix-error ELNRNG 48 "Link number out of range") -(def-unix-error EUNATCH 49 "Protocol driver not attached") -(def-unix-error ENOCSI 50 "No CSI structure available") -(def-unix-error EL2HLT 51 "Level 2 halted") -(def-unix-error EBADE 52 "Invalid exchange") -(def-unix-error EBADR 53 "Invalid request descriptor") -(def-unix-error EXFULL 54 "Exchange full") -(def-unix-error ENOANO 55 "No anode") -(def-unix-error EBADRQC 56 "Invalid request code") -(def-unix-error EBADSLT 57 "Invalid slot") -(def-unix-error EDEADLOCK EDEADLK "File locking deadlock error") -(def-unix-error EBFONT 59 "Bad font file format") -(def-unix-error ENOSTR 60 "Device not a stream") -(def-unix-error ENODATA 61 "No data available") -(def-unix-error ETIME 62 "Timer expired") -(def-unix-error ENOSR 63 "Out of streams resources") -(def-unix-error ENONET 64 "Machine is not on the network") -(def-unix-error ENOPKG 65 "Package not installed") -(def-unix-error EREMOTE 66 "Object is remote") -(def-unix-error ENOLINK 67 "Link has been severed") -(def-unix-error EADV 68 "Advertise error") -(def-unix-error ESRMNT 69 "Srmount error") -(def-unix-error ECOMM 70 "Communication error on send") -(def-unix-error EPROTO 71 "Protocol error") -(def-unix-error EMULTIHOP 72 "Multihop attempted") -(def-unix-error EDOTDOT 73 "RFS specific error") -(def-unix-error EBADMSG 74 "Not a data message") -(def-unix-error EOVERFLOW 75 "Value too large for defined data type") -(def-unix-error ENOTUNIQ 76 "Name not unique on network") -(def-unix-error EBADFD 77 "File descriptor in bad state") -(def-unix-error EREMCHG 78 "Remote address changed") -(def-unix-error ELIBACC 79 "Can not access a needed shared library") -(def-unix-error ELIBBAD 80 "Accessing a corrupted shared library") -(def-unix-error ELIBSCN 81 ".lib section in a.out corrupted") -(def-unix-error ELIBMAX 82 "Attempting to link in too many shared libraries") -(def-unix-error ELIBEXEC 83 "Cannot exec a shared library directly") -(def-unix-error EILSEQ 84 "Illegal byte sequence") -(def-unix-error ERESTART 85 "Interrupted system call should be restarted ") -(def-unix-error ESTRPIPE 86 "Streams pipe error") -(def-unix-error EUSERS 87 "Too many users") -(def-unix-error ENOTSOCK 88 "Socket operation on non-socket") -(def-unix-error EDESTADDRREQ 89 "Destination address required") -(def-unix-error EMSGSIZE 90 "Message too long") -(def-unix-error EPROTOTYPE 91 "Protocol wrong type for socket") -(def-unix-error ENOPROTOOPT 92 "Protocol not available") -(def-unix-error EPROTONOSUPPORT 93 "Protocol not supported") -(def-unix-error ESOCKTNOSUPPORT 94 "Socket type not supported") -(def-unix-error EOPNOTSUPP 95 "Operation not supported on transport endpoint") -(def-unix-error EPFNOSUPPORT 96 "Protocol family not supported") -(def-unix-error EAFNOSUPPORT 97 "Address family not supported by protocol") -(def-unix-error EADDRINUSE 98 "Address already in use") -(def-unix-error EADDRNOTAVAIL 99 "Cannot assign requested address") -(def-unix-error ENETDOWN 100 "Network is down") -(def-unix-error ENETUNREACH 101 "Network is unreachable") -(def-unix-error ENETRESET 102 "Network dropped connection because of reset") -(def-unix-error ECONNABORTED 103 "Software caused connection abort") -(def-unix-error ECONNRESET 104 "Connection reset by peer") -(def-unix-error ENOBUFS 105 "No buffer space available") -(def-unix-error EISCONN 106 "Transport endpoint is already connected") -(def-unix-error ENOTCONN 107 "Transport endpoint is not connected") -(def-unix-error ESHUTDOWN 108 "Cannot send after transport endpoint shutdown") -(def-unix-error ETOOMANYREFS 109 "Too many references: cannot splice") -(def-unix-error ETIMEDOUT 110 "Connection timed out") -(def-unix-error ECONNREFUSED 111 "Connection refused") -(def-unix-error EHOSTDOWN 112 "Host is down") -(def-unix-error EHOSTUNREACH 113 "No route to host") -(def-unix-error EALREADY 114 "Operation already in progress") -(def-unix-error EINPROGRESS 115 "Operation now in progress") -(def-unix-error ESTALE 116 "Stale NFS file handle") -(def-unix-error EUCLEAN 117 "Structure needs cleaning") -(def-unix-error ENOTNAM 118 "Not a XENIX named type file") -(def-unix-error ENAVAIL 119 "No XENIX semaphores available") -(def-unix-error EISNAM 120 "Is a named type file") -(def-unix-error EREMOTEIO 121 "Remote I/O error") -(def-unix-error EDQUOT 122 "Quota exceeded") -|# - -;;; And now for something completely different ... -(emit-unix-errors) +;;; FIXME: Many Unix error code definitions were deleted from the old +;;; CMU CL source code here, but not in the exports of SB-UNIX. I +;;; (WHN) hope that someday I'll figure out an automatic way to detect +;;; unused symbols in package exports, but if I don't, there are +;;; enough of them all in one place here that they should probably be +;;; removed by hand. -;;;; support routines for dealing with unix pathnames +;;;; support routines for dealing with Unix pathnames (defun unix-file-kind (name &optional check-for-links) #!+sb-doc "Return either :FILE, :DIRECTORY, :LINK, :SPECIAL, or NIL." - (declare (simple-string name)) + (declare (simple-base-string name)) (multiple-value-bind (res dev ino mode) (if check-for-links (unix-lstat name) (unix-stat name)) (declare (type (or fixnum null) mode) - (ignore dev ino)) + (ignore dev ino)) (when res (let ((kind (logand mode s-ifmt))) - (cond ((eql kind s-ifdir) :directory) - ((eql kind s-ifreg) :file) - ((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)))) - + (cond ((eql kind s-ifdir) :directory) + ((eql kind s-ifreg) :file) + ((eql kind s-iflnk) :link) + (t :special)))))) + +;;; 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) - #!+sb-doc - "Returns the pathname with all symbolic links resolved." - (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 "error reading link ~S: ~S" - (subseq result 0 fill-ptr) - (get-unix-error-msg 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-base-string pathname)) + (aver (not (relative-unix-pathname? pathname))) + ;; KLUDGE: readlink and lstat are unreliable if given symlinks + ;; ending in slashes -- fix the issue here instead of waiting for + ;; libc to change... + (let ((len (length pathname))) + (when (and (plusp len) (eql #\/ (schar pathname (1- len)))) + (setf pathname (subseq pathname 0 (1- len))))) + (/noshow "entering UNIX-RESOLVE-LINKS") + (loop with previous-pathnames = nil do + (/noshow pathname previous-pathnames) + (let ((link (unix-readlink pathname))) + (/noshow 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))) + (/noshow dir) + (concatenate 'base-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-base-string src)) (let* ((src-len (length src)) - (dst (make-string src-len)) - (dst-len 0) - (dots 0) - (last-slash nil)) + (dst (make-string src-len :element-type 'base-char)) + (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 #\.) - (when dots - (incf dots)) - (deposit char)) - ((char= char #\/) - (case dots - (0 - ;; Either ``/...' or ``...//...' - (unless last-slash - (setf last-slash dst-len) - (deposit char))) - (1 - ;; Either ``./...'' or ``..././...'' - (decf dst-len)) - (2 - ;; We've found .. - (cond - ((and last-slash (not (zerop last-slash))) - ;; There is something before this .. - (let ((prev-prev-slash - (position #\/ dst :end last-slash :from-end t))) - (cond ((and (= (+ (or prev-prev-slash 0) 2) - last-slash) - (char= (schar dst (- last-slash 2)) #\.) - (char= (schar dst (1- last-slash)) #\.)) - ;; The something before this .. is another .. - (deposit char) - (setf last-slash dst-len)) - (t - ;; The something is some directory or other. - (setf dst-len - (if prev-prev-slash - (1+ prev-prev-slash) - 0)) - (setf last-slash prev-prev-slash))))) - (t - ;; There is nothing before this .., so we need to keep it - (setf last-slash dst-len) - (deposit char)))) - (t - ;; Something other than a dot between slashes. - (setf last-slash dst-len) - (deposit char))) - (setf dots 0)) - (t - (setf dots nil) - (setf (schar dst dst-len) char) - (incf dst-len)))))) + (let ((char (schar src src-index))) + (cond ((char= char #\.) + (when dots + (incf dots)) + (deposit char)) + ((char= char #\/) + (case dots + (0 + ;; either ``/...' or ``...//...' + (unless last-slash + (setf last-slash dst-len) + (deposit char))) + (1 + ;; either ``./...'' or ``..././...'' + (decf dst-len)) + (2 + ;; We've found .. + (cond + ((and last-slash (not (zerop last-slash))) + ;; There is something before this .. + (let ((prev-prev-slash + (position #\/ dst :end last-slash :from-end t))) + (cond ((and (= (+ (or prev-prev-slash 0) 2) + last-slash) + (char= (schar dst (- last-slash 2)) #\.) + (char= (schar dst (1- last-slash)) #\.)) + ;; The something before this .. is another .. + (deposit char) + (setf last-slash dst-len)) + (t + ;; The something is some directory or other. + (setf dst-len + (if prev-prev-slash + (1+ prev-prev-slash) + 0)) + (setf last-slash prev-prev-slash))))) + (t + ;; There is nothing before this .., so we need to keep it + (setf last-slash dst-len) + (deposit char)))) + (t + ;; something other than a dot between slashes + (setf last-slash dst-len) + (deposit char))) + (setf dots 0)) + (t + (setf dots nil) + (setf (schar dst dst-len) char) + (incf dst-len)))))) (when (and last-slash (not (zerop last-slash))) (case dots - (1 - ;; We've got ``foobar/.'' - (decf dst-len)) - (2 - ;; We've got ``foobar/..'' - (unless (and (>= last-slash 2) - (char= (schar dst (1- last-slash)) #\.) - (char= (schar dst (- last-slash 2)) #\.) - (or (= last-slash 2) - (char= (schar dst (- last-slash 3)) #\/))) - (let ((prev-prev-slash - (position #\/ dst :end last-slash :from-end t))) - (if prev-prev-slash - (setf dst-len (1+ prev-prev-slash)) - (return-from unix-simplify-pathname "./"))))))) + (1 + ;; We've got ``foobar/.'' + (decf dst-len)) + (2 + ;; We've got ``foobar/..'' + (unless (and (>= last-slash 2) + (char= (schar dst (1- last-slash)) #\.) + (char= (schar dst (- last-slash 2)) #\.) + (or (= last-slash 2) + (char= (schar dst (- last-slash 3)) #\/))) + (let ((prev-prev-slash + (position #\/ dst :end last-slash :from-end t))) + (if prev-prev-slash + (setf dst-len (1+ prev-prev-slash)) + (return-from unix-simplify-pathname + (coerce "./" 'simple-base-string)))))))) (cond ((zerop dst-len) - "./") - ((= dst-len src-len) - dst) - (t - (subseq dst 0 dst-len))))) + "./") + ((= dst-len src-len) + dst) + (t + (subseq dst 0 dst-len))))) + +;;;; A magic constant for wait3(). +;;;; +;;;; FIXME: This used to be defined in run-program.lisp as +;;;; (defconstant wait-wstopped #-svr4 #o177 #+svr4 wait-wuntraced) +;;;; According to some of the man pages, the #o177 is part of the API +;;;; for wait3(); that said, under SunOS there is a WSTOPPED thing in +;;;; the headers that may or may not be the same thing. To be +;;;; investigated. -- CSR, 2002-03-25 +(defconstant wstopped #o177) + ;;;; stuff not yet found in the header files ;;;; @@ -1301,33 +993,38 @@ ;;; not checked for linux... (defmacro fd-set (offset fd-set) (let ((word (gensym)) - (bit (gensym))) - `(multiple-value-bind (,word ,bit) (floor ,offset 32) + (bit (gensym))) + `(multiple-value-bind (,word ,bit) (floor ,offset + sb!vm:n-machine-word-bits) (setf (deref (slot ,fd-set 'fds-bits) ,word) - (logior (truly-the (unsigned-byte 32) (ash 1 ,bit)) - (deref (slot ,fd-set 'fds-bits) ,word)))))) + (logior (truly-the (unsigned-byte #.sb!vm:n-machine-word-bits) + (ash 1 ,bit)) + (deref (slot ,fd-set 'fds-bits) ,word)))))) ;;; not checked for linux... (defmacro fd-clr (offset fd-set) (let ((word (gensym)) - (bit (gensym))) - `(multiple-value-bind (,word ,bit) (floor ,offset 32) + (bit (gensym))) + `(multiple-value-bind (,word ,bit) (floor ,offset + sb!vm:n-machine-word-bits) (setf (deref (slot ,fd-set 'fds-bits) ,word) - (logand (deref (slot ,fd-set 'fds-bits) ,word) - (sb!kernel:32bit-logical-not - (truly-the (unsigned-byte 32) (ash 1 ,bit)))))))) + (logand (deref (slot ,fd-set 'fds-bits) ,word) + (sb!kernel:word-logical-not + (truly-the (unsigned-byte #.sb!vm:n-machine-word-bits) + (ash 1 ,bit)))))))) ;;; not checked for linux... (defmacro fd-isset (offset fd-set) (let ((word (gensym)) - (bit (gensym))) - `(multiple-value-bind (,word ,bit) (floor ,offset 32) + (bit (gensym))) + `(multiple-value-bind (,word ,bit) (floor ,offset + sb!vm:n-machine-word-bits) (logbitp ,bit (deref (slot ,fd-set 'fds-bits) ,word))))) ;;; not checked for linux... (defmacro fd-zero (fd-set) `(progn - ,@(loop for index upfrom 0 below (/ fd-setsize 32) - collect `(setf (deref (slot ,fd-set 'fds-bits) ,index) 0)))) + ,@(loop for index upfrom 0 below (/ fd-setsize sb!vm:n-machine-word-bits) + collect `(setf (deref (slot ,fd-set 'fds-bits) ,index) 0)))) + -(/show0 "unix.lisp 3555")