;;;; 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 ;;;; unmaintainable in practice as you'd expect in theory, so I really really ;;;; don't want to do that. It'd be good to implement the various system calls ;;;; as C code implemented using the Unix header files, and have their ;;;; interface back to SBCL code be characterized by things like "32-bit-wide ;;;; int" which are already in the interface between the runtime ;;;; executable and the SBCL lisp code. ;;;; This software is part of the SBCL system. See the README file for ;;;; more information. ;;;; ;;;; This software is derived from the CMU CL system, which was ;;;; written at Carnegie Mellon University and released into the ;;;; public domain. The software is in the public domain and is ;;;; provided with absolutely no warranty. See the COPYING and CREDITS ;;;; files for more information. (in-package "SB!UNIX") (/show0 "unix.lisp 21") (defmacro def-enum (inc cur &rest names) (flet ((defform (name) (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-fd () `(integer 0 ,most-positive-fixnum)) (deftype unix-file-mode () '(unsigned-byte 32)) (deftype unix-pid () '(unsigned-byte 32)) (deftype unix-uid () '(unsigned-byte 32)) (deftype unix-gid () '(unsigned-byte 32)) ;;;; system calls (/show0 "unix.lisp 74") ;;; 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) `(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) `(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") (defmacro void-syscall ((name &rest arg-types) &rest args) `(syscall (,name ,@arg-types) (values t 0) ,@args)) (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 #!-win32 (eql ,errno sb!unix:eintr) #!+win32 nil (return (values ,value ,errno)))) ,@body)) #!+win32 (progn (defconstant espipe 29) ;; For stat-wrapper hack (different-type or non-existing win32 fields). (define-alien-type nlink-t short) (define-alien-type uid-t short) (define-alien-type gid-t short)) ;;;; hacking the Unix environment #!-win32 (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. #!-win32 (defun unix-rename (name1 name2) (declare (type unix-pathname name1 name2)) (void-syscall ("rename" c-string c-string) name1 name2)) ;;; from sys/types.h and gnu/types.h (/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) (defconstant fd-setsize 1024)) (define-alien-type nil (struct fd-set (fds-bits (array fd-mask #.(/ fd-setsize sb!vm:n-machine-word-bits))))) (/show0 "unix.lisp 304") ;;;; fcntl.h ;;;; ;;;; POSIX Standard: 6.5 File Control Operations ;;; 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) (declare (type unix-pathname path) (type fixnum flags) (type unix-file-mode mode)) (int-syscall ("open" c-string int int) path (logior #!+win32 o_binary #!+largefile o_largefile 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) (declare (type unix-fd fd)) (void-syscall ("close" int) fd)) ;;;; timebits.h ;; A time value that is accurate to the nearest ;; microsecond but also has a range of years. ;; CLH: Note that tv-usec used to be a time-t, but that this seems ;; problematic on Darwin x86-64 (and wrong). Trying suseconds-t. #!-win32 (define-alien-type nil (struct timeval (tv-sec time-t) ; seconds (tv-usec suseconds-t))) ; and microseconds #!+win32 (define-alien-type nil (struct timeval (tv-sec time-t) ; seconds (tv-usec long))) ; and microseconds ;;;; resourcebits.h (defconstant rusage_self 0) ; the calling process (defconstant rusage_children -1) ; terminated child processes (defconstant rusage_both -2) (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 ;;;; unistd.h ;;; 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. ;;; In Windows, the MODE argument to access is defined in terms of ;;; literal magic numbers---there are no constants to grovel. X_OK ;;; is not defined. #!+win32 (progn (defconstant f_ok 0) (defconstant w_ok 2) (defconstant r_ok 4)) (defun unix-access (path mode) (declare (type unix-pathname path) (type (mod 8) mode)) (void-syscall ("access" c-string int) path mode)) ;;; 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) "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. " (declare (type unix-fd fd) (type (integer 0 2) whence)) (let ((result (alien-funcall (extern-alien #!-largefile "lseek" #!+largefile "lseek_largefile" (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) (declare (type unix-fd fd) (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 buffer starting at offset. It returns ;;; the actual number of bytes written. (defun unix-write (fd buf offset len) (declare (type unix-fd fd) (type (unsigned-byte 32) offset len)) (flet ((%write (sap) (declare (system-area-pointer sap)) (int-syscall ("write" int (* char) int) fd (with-alien ((ptr (* char) sap)) (addr (deref ptr offset))) len))) (etypecase buf ((simple-array * (*)) (with-pinned-objects (buf) (%write (vector-sap buf)))) (system-area-pointer (%write buf))))) ;;; 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. #!-win32 (defun unix-pipe () (with-alien ((fds (array int 2))) (syscall ("pipe" (* int)) (values (deref fds 0) (deref fds 1)) (cast fds (* int))))) #!+win32 (defun msvcrt-raw-pipe (fds size mode) (syscall ("_pipe" (* int) int int) (values (deref fds 0) (deref fds 1)) (cast fds (* int)) size mode)) #!+win32 (defun unix-pipe () (with-alien ((fds (array int 2))) (msvcrt-raw-pipe fds 256 o_binary))) ;; Windows mkdir() doesn't take the mode argument. It's cdecl, so we could ;; actually call it passing the mode argument, but some sharp-eyed reader ;; would put five and twenty-seven together and ask us about it, so... ;; -- AB, 2005-12-27 #!-win32 (defun unix-mkdir (name mode) (declare (type unix-pathname name) (type unix-file-mode mode) #!+win32 (ignore mode)) (void-syscall ("mkdir" c-string #!-win32 int) name #!-win32 mode)) ;;; 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). #!-win32 (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. ;; ;; FIXME: The (,stub,) nastiness produces an error message about a ;; comma not inside a backquote. This error has absolutely nothing ;; to do with the actual meaning of the error (and little to do with ;; its location, either). #!-(or linux openbsd freebsd netbsd sunos osf1 darwin win32) (,stub,) #!+(or linux openbsd freebsd netbsd sunos osf1 darwin win32) (or (newcharstar-string (alien-funcall (extern-alien "getcwd" (function (* char) (* char) size-t)) nil #!+(or linux openbsd freebsd netbsd darwin win32) 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) "/")) ;;; 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) (declare (type unix-fd fd)) (int-syscall ("dup" int) fd)) ;;; 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)) (declare (type (signed-byte 32) code)) (void-syscall ("exit" int) code)) ;;; 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. #!-win32 (define-alien-routine ("getuid" unix-getuid) int) ;;; Translate a user id into a login name. #!-win32 (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 #\/ #!-win32 (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. #!-win32 (defun unix-readlink (path) (declare (type unix-pathname path)) (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))))) #!+win32 ;; Win32 doesn't do links, but something likes to call this anyway. ;; Something in this file, no less. But it only takes one result, so... (defun unix-readlink (path) (declare (ignore path)) nil) ;;; 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) (declare (type unix-pathname name)) (void-syscall ("unlink" c-string) name)) ;;; Return the name of the host machine as a string. #!-win32 (defun unix-gethostname () (with-alien ((buf (array char 256))) (syscall ("gethostname" (* char) int) (cast buf c-string) (cast buf (* char)) 256))) #!-win32 (defun unix-setsid () (int-syscall ("setsid"))) ;;;; sys/ioctl.h ;;; UNIX-IOCTL performs a variety of operations on open i/o ;;; descriptors. See the UNIX Programmer's Manual for more ;;; information. #!-win32 (defun unix-ioctl (fd cmd arg) (declare (type unix-fd fd) (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)) #!-win32 (defun unix-fast-getrusage (who) (declare (values (member t) (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)))) ;;; 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. #!-win32 (defun unix-getrusage (who) (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)))) ;;;; sys/select.h (defvar *on-dangerous-select* :warn) ;;; Calling select in a bad place can hang in a nasty manner, so it's better ;;; to have some way to detect these. (defun note-dangerous-select () (let ((action *on-dangerous-select*) (*on-dangerous-select* nil)) (case action (:warn (warn "Starting a select without a timeout while interrupts are ~ disabled.")) (:error (error "Starting a select without a timeout while interrupts are ~ disabled.")) (:backtrace (write-line "=== Starting a select without a timeout while interrupts are disabled. ===" *debug-io*) (sb!debug:backtrace))) nil)) ;;;; FIXME: Why have both UNIX-SELECT and UNIX-FAST-SELECT? ;;; Perform the UNIX select(2) system call. (declaim (inline unix-fast-select)) (defun unix-fast-select (num-descriptors read-fds write-fds exception-fds timeout-secs timeout-usecs) (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 timeout-usecs)) (flet ((select (tv-sap) (int-syscall ("select" int (* (struct fd-set)) (* (struct fd-set)) (* (struct fd-set)) (* (struct timeval))) num-descriptors read-fds write-fds exception-fds tv-sap))) (cond ((or timeout-secs timeout-usecs) (with-alien ((tv (struct timeval))) (setf (slot tv 'tv-sec) (or timeout-secs 0)) (setf (slot tv 'tv-usec) (or timeout-usecs 0)) (select (alien-sap (addr tv))))) (t (unless *interrupts-enabled* (note-dangerous-select)) (select (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 sb!vm:n-machine-word-bits) collect `(setf (deref (slot ,fdset 'fds-bits) ,index) 0))) (progn ,@(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 sb!vm:n-machine-word-bits) (deref (slot ,fdset 'fds-bits) 0) (+ ,@(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)) (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))) (cond (to-secs (setf (slot tv 'tv-sec) to-secs (slot tv 'tv-usec) to-usecs)) ((not *interrupts-enabled*) (note-dangerous-select))) (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))))) (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)))))) ;;;; sys/stat.h ;;; 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't 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 #!-(or mips largefile) unsigned-int #!+mips unsigned-long #!+(and largefile (not mips)) dev-t) (st-ino ino-t) (st-mode mode-t) (st-nlink nlink-t) (st-uid uid-t) (st-gid gid-t) (st-rdev #!-(or mips largefile) unsigned-int #!+mips unsigned-long #!+(and largefile (not mips)) dev-t) (st-size #!-(or darwin mips largefile) unsigned-int #!+(or darwin mips largefile) off-t) #!+(and darwin) (st-blksize unsigned-int) #!-(and darwin) (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) (declare (type unix-pathname name)) (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) (declare (type unix-pathname name)) (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 ;; 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 ;; 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. (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)) #!-win32 (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 seconds))) ;;;; sys/time.h ;;; Structure crudely representing a timezone. KLUDGE: This is ;;; obsolete and should never be used. (define-alien-type nil (struct timezone (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 () #!+(and x86-64 darwin) (with-alien ((tv (struct timeval))) ;; CLH: FIXME! This seems to be a MacOS bug, but on x86-64/darwin, ;; gettimeofday occasionally fails. passing in a null pointer for ;; the timezone struct seems to work around the problem. I can't ;; find any instances in the SBCL where we actually ues the ;; timezone values, so we just punt for the moment. (syscall* ("gettimeofday" (* (struct timeval)) (* (struct timezone))) (values t (slot tv 'tv-sec) (slot tv 'tv-usec)) (addr tv) nil)) #!-(and x86-64 darwin) (with-alien ((tv (struct timeval)) (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)))) ;; 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) #!-win32 (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)))))) #!-win32 (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)))))) ;;; 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 (defun unix-file-kind (name &optional check-for-links) #!+sb-doc "Return either :FILE, :DIRECTORY, :LINK, :SPECIAL, or NIL." (declare (simple-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)) (when res (let ((kind (logand mode s-ifmt))) (cond ((eql kind s-ifdir) :directory) ((eql kind s-ifreg) :file) #!-win32 ((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) (declare (type simple-string pathname)) ;; KLUDGE: The Win32 platform doesn't have symbolic links, so ;; short-cut this computation (and the check for being an absolute ;; unix pathname...) #!+win32 (return-from unix-resolve-links 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... ;; ;; but be careful! Must not strip the final slash from "/". (This ;; adjustment might be a candidate for being transferred into the C ;; code in a wrap_readlink() function, too.) CSR, 2006-01-18 (let ((len (length pathname))) (when (and (> len 1) (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 (simplify-namestring (if (relative-unix-pathname? link) (let* ((dir-len (1+ (position #\/ pathname :from-end t))) (dir (subseq pathname 0 dir-len))) (/noshow 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)))) (defconstant micro-seconds-per-internal-time-unit (/ 1000000 sb!xc:internal-time-units-per-second)) ;;; UNIX specific code, that has been cleanly separated from the ;;; Windows build. #!-win32 (progn (declaim (inline system-internal-run-time system-real-time-values)) (defun system-real-time-values () (multiple-value-bind (_ sec usec) (unix-gettimeofday) (declare (ignore _) (type (unsigned-byte 32) sec usec)) (values sec (truncate usec micro-seconds-per-internal-time-unit)))) ;; There are two optimizations here that actually matter (on 32-bit ;; systems): substract the epoch from seconds and milliseconds ;; separately, as those should remain fixnums for the first 17 years ;; or so of runtime. Also, avoid doing consing a new bignum if the ;; result would be = to the last result given. ;; ;; Note: the next trick would be to spin a separate thread to update ;; a global value once per internal tick, so each individual call to ;; get-internal-real-time would be just a memory read... but that is ;; probably best left for user-level code. ;) ;; ;; Thanks to James Anderson for the optimization hint. ;; ;; Yes, it is possible to a computation to be GET-INTERNAL-REAL-TIME ;; bound. ;; ;; --NS 2007-04-05 (let ((e-sec 0) (e-msec 0) (c-sec 0) (c-msec 0) (now 0)) (declare (type (unsigned-byte 32) e-sec c-sec) (type fixnum e-msec c-msec) (type unsigned-byte now)) (defun reinit-internal-real-time () (setf (values e-sec e-msec) (system-real-time-values) c-sec 0 c-msec 0)) ;; If two threads call this at the same time, we're still safe, I believe, ;; as long as NOW is updated before either of C-MSEC or C-SEC. Same applies ;; to interrupts. --NS (defun get-internal-real-time () (multiple-value-bind (sec msec) (system-real-time-values) (unless (and (= msec c-msec) (= sec c-sec)) (setf now (+ (* (- sec e-sec) sb!xc:internal-time-units-per-second) (- msec e-msec)) c-msec msec c-sec sec)) now))) (defun system-internal-run-time () (multiple-value-bind (ignore utime-sec utime-usec stime-sec stime-usec) (unix-fast-getrusage rusage_self) (declare (ignore ignore) (type (unsigned-byte 31) utime-sec stime-sec) ;; (Classic CMU CL had these (MOD 1000000) instead, but ;; at least in Linux 2.2.12, the type doesn't seem to ;; be documented anywhere and the observed behavior is ;; to sometimes return 1000000 exactly.) (type (integer 0 1000000) utime-usec stime-usec)) (let ((result (+ (* (+ utime-sec stime-sec) sb!xc:internal-time-units-per-second) (floor (+ utime-usec stime-usec (floor micro-seconds-per-internal-time-unit 2)) micro-seconds-per-internal-time-unit)))) result)))) ;;;; 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 ;;;; ;;;; Abandon all hope who enters here... ;;; not checked for linux... (defmacro fd-set (offset fd-set) (let ((word (gensym)) (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 #.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 sb!vm:n-machine-word-bits) (setf (deref (slot ,fd-set 'fds-bits) ,word) (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 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 sb!vm:n-machine-word-bits) collect `(setf (deref (slot ,fd-set 'fds-bits) ,index) 0))))