contrib/sb-posix/interface.lisp

   1 (cl:in-package :sb-posix)
   2
   3 (defmacro define-protocol-class
   4     (name alien-type superclasses slots &rest options)
   5   (let ((to-protocol (intern (format nil "ALIEN-TO-~A" name)))
   6         (to-alien (intern (format nil "~A-TO-ALIEN" name))))
   7     `(progn
   8       (export ',name :sb-posix)
   9       (defclass ,name ,superclasses
  10         ,(loop for slotd in slots
  11                collect (ldiff slotd (member :array-length slotd)))
  12         ,@options)
  13       (declaim (inline ,to-alien ,to-protocol))
  14       (declaim (inline ,to-protocol ,to-alien))
  15       (defun ,to-protocol (alien &optional instance)
  16         (declare (type (sb-alien:alien (* ,alien-type)) alien)
  17                  (type (or null ,name) instance))
  18         (unless instance
  19           (setf instance (make-instance ',name)))
  20         ,@(loop for slotd in slots
  21                 ;; FIXME: slotds in source are more complicated in general
  22                 ;;
  23                 ;; FIXME: baroque construction of intricate fragility
  24                 for array-length = (getf (cdr slotd) :array-length)
  25                 if array-length
  26                   collect `(progn
  27                              (let ((array (make-array ,array-length)))
  28                                (setf (slot-value instance ',(car slotd))
  29                                      array)
  30                                (dotimes (i ,array-length)
  31                                  (setf (aref array i)
  32                                        (sb-alien:deref
  33                                         (sb-alien:slot alien ',(car slotd))
  34                                         i)))))
  35                 else
  36                   collect `(setf (slot-value instance ',(car slotd))
  37                                  (sb-alien:slot alien ',(car slotd))))
  38         instance)
  39       (defun ,to-alien (instance &optional alien)
  40         (declare (type (or null (sb-alien:alien (* ,alien-type))) alien)
  41                  (type ,name instance))
  42         (unless alien
  43           (setf alien (sb-alien:make-alien ,alien-type)))
  44         ,@(loop for slotd in slots
  45                 for array-length = (getf (cdr slotd) :array-length)
  46                 if array-length
  47                   collect `(progn
  48                              (let ((array (slot-value instance ',(car slotd))))
  49                                (dotimes (i ,array-length)
  50                                  (setf (sb-alien:deref
  51                                         (sb-alien:slot alien ',(car slotd))
  52                                         i)
  53                                        (aref array i)))))
  54                 else
  55                   collect `(setf (sb-alien:slot alien ',(car slotd))
  56                                  (slot-value instance ',(car slotd)))))
  57       (find-class ',name))))
  58
  59 (define-condition sb-posix:syscall-error (error)
  60   ((errno :initarg :errno :reader sb-posix:syscall-errno))
  61   (:report (lambda (c s)
  62              (let ((errno (sb-posix:syscall-errno c)))
  63                (format s "System call error ~A (~A)"
  64                        errno (sb-int:strerror errno))))))
  65
  66 (defvar *errno-table*
  67   (let ((errno-max 0)
  68         list)
  69     (do-symbols (symbol (find-package "SB-POSIX"))
  70       (when (get symbol 'errno)
  71         (let ((errno (symbol-value symbol)))
  72           (setf errno-max (max errno  errno-max))
  73           (push (cons errno
  74                       (eval `(define-condition ,symbol (syscall-error) ())))
  75                 list))))
  76     (let ((table (make-array (1+ errno-max))))
  77       (mapc #'(lambda (cons) (setf (elt table (car cons)) (cdr cons))) list)
  78       table)))
  79
  80 (defun syscall-error ()
  81   (let ((errno (get-errno)))
  82     (error (elt *errno-table* errno) :errno errno)))
  83
  84 ;; Note that we inherit from SIMPLE-FILE-ERROR first, to get its
  85 ;; error reporting, rather than SYSCALL-ERROR's.
  86 (define-condition file-syscall-error
  87     (sb-impl::simple-file-error syscall-error)
  88   ())
  89
  90 (defvar *file-errno-table*
  91   (let ((array (copy-seq *errno-table*)))
  92     (map-into array
  93               (lambda (condition-class-name)
  94                 (if (symbolp condition-class-name)
  95                     (let ((file-condition-name
  96                            (read-from-string
  97                             (format nil "FILE-~A" condition-class-name))))
  98                       ;; Should condition class names like FILE-ENOENT
  99                       ;; and FILE-ENOTDIR be exported?  I want to say
 100                       ;; "no", since we already export ENOENT, ENOTDIR
 101                       ;; et al, and so the user can write handlers
 102                       ;; such as
 103                       ;;
 104                       ;;  (handler-bind ((sb-posix:enoent ...)
 105                       ;;                 (sb-posix:enotdir ...)
 106                       ;;                 (file-error ...))
 107                       ;;    ...)
 108                       ;;
 109                       ;; which will do the right thing for all our
 110                       ;; FILE-SYSCALL-ERRORs, without exposing this
 111                       ;; implementation detail.  (Recall that some
 112                       ;; FILE-ERRORs don't strictly have to do with
 113                       ;; the file system, e.g., supplying a wild
 114                       ;; pathname to some functions.)  But if the
 115                       ;; prevailing opinion is otherwise, uncomment
 116                       ;; the following.
 117                       #| (export file-condition-name) |#
 118                       (eval `(define-condition ,file-condition-name
 119                                  (,condition-class-name file-syscall-error)
 120                                ())))
 121                     condition-class-name))
 122               array)
 123     array))
 124
 125 ;; Note: do we have to declare SIMPLE-FILE-PERROR notinline in
 126 ;; fd-stream.lisp?
 127 (sb-ext:without-package-locks
 128   (defun sb-impl::simple-file-perror (note-format pathname errno)
 129     (error (elt *file-errno-table* errno)
 130            :pathname pathname
 131            :errno errno
 132            :format-control "~@<~?: ~2I~_~A~:>"
 133            :format-arguments
 134            (list note-format (list pathname) (sb-int:strerror errno)))))
 135
 136 ;; Note: it might prove convenient to develop a parallel set of
 137 ;; condition classes for STREAM-ERRORs, too.
 138 (declaim (inline never-fails))
 139 (defun never-fails (&rest args)
 140   (declare (ignore args))
 141   nil)
 142
 143 ;;; Some systems may need C-level wrappers, which can live in the
 144 ;;; runtime (so that save-lisp-and-die can produce standalone
 145 ;;; executables).  See REAL-C-NAME in macros.lisp for the use of this
 146 ;;; variable.
 147 (eval-when (:compile-toplevel :load-toplevel)
 148   (setf *c-functions-in-runtime*
 149         '`(#+netbsd ,@("stat" "lstat" "fstat" "readdir" "opendir"))))
 150
 151
 152 ;;; filesystem access
 153 (defmacro define-call* (name &rest arguments)
 154   #-win32 `(define-call ,name ,@arguments)
 155   #+win32 `(define-call ,(if (consp name)
 156                              `(,(concatenate 'string "_" (car name))
 157                                 ,@(cdr name))
 158                              (concatenate 'string "_" name))
 159                ,@arguments))
 160
 161 (define-call* "access" int minusp (pathname filename) (mode int))
 162 (define-call* "chdir" int minusp (pathname filename))
 163 (define-call* "chmod" int minusp (pathname filename) (mode mode-t))
 164 (define-call* "close" int minusp (fd file-descriptor))
 165 (define-call* "creat" int minusp (pathname filename) (mode mode-t))
 166 (define-call* "dup" int minusp (oldfd file-descriptor))
 167 (define-call* "dup2" int minusp (oldfd file-descriptor)
 168               (newfd file-descriptor))
 169 (define-call* ("lseek" :options :largefile)
 170     off-t minusp (fd file-descriptor) (offset off-t)
 171     (whence int))
 172 (define-call* "mkdir" int minusp (pathname filename) (mode mode-t))
 173 (macrolet ((def (x)
 174                `(progn
 175                  (define-call-internally open-with-mode ,x int minusp
 176                    (pathname filename) (flags int) (mode mode-t))
 177                  (define-call-internally open-without-mode ,x int minusp
 178                    (pathname filename) (flags int))
 179                  (define-entry-point ,x
 180                      (pathname flags &optional (mode nil mode-supplied))
 181                    (if mode-supplied
 182                        (open-with-mode pathname flags mode)
 183                        (open-without-mode pathname flags))))))
 184     (def #-win32 "open" #+win32 "_open"))
 185 (define-call "rename" int minusp (oldpath filename) (newpath filename))
 186 (define-call* "rmdir" int minusp (pathname filename))
 187 (define-call* "unlink" int minusp (pathname filename))
 188 (define-call #-netbsd "opendir" #+netbsd "_opendir"
 189     (* t) null-alien (pathname filename))
 190 (define-call (#-netbsd "readdir" #+netbsd "_readdir" :options :largefile)
 191   (* dirent)
 192   ;; readdir() has the worst error convention in the world.  It's just
 193   ;; too painful to support.  (return is NULL _and_ errno "unchanged"
 194   ;; is not an error, it's EOF).
 195   not
 196   (dir (* t)))
 197 (define-call "closedir" int minusp (dir (* t)))
 198 ;; need to do this here because we can't do it in the DEFPACKAGE
 199 (define-call* "umask" mode-t never-fails (mode mode-t))
 200 (define-call* "getpid" pid-t never-fails)
 201
 202 #-win32
 203 (progn
 204   (define-call "chown" int minusp (pathname filename)
 205                (owner uid-t) (group gid-t))
 206   (define-call "chroot" int minusp (pathname filename))
 207   (define-call "fchdir" int minusp (fd file-descriptor))
 208   (define-call "fchmod" int minusp (fd file-descriptor) (mode mode-t))
 209   (define-call "fchown" int minusp (fd file-descriptor)
 210                (owner uid-t)  (group gid-t))
 211   (define-call "fdatasync" int minusp (fd file-descriptor))
 212   (define-call ("ftruncate" :options :largefile)
 213       int minusp (fd file-descriptor) (length off-t))
 214   (define-call "fsync" int minusp (fd file-descriptor))
 215   (define-call "lchown" int minusp (pathname filename)
 216                (owner uid-t)  (group gid-t))
 217   (define-call "link" int minusp (oldpath filename) (newpath filename))
 218   (define-call "lockf" int minusp (fd file-descriptor) (cmd int) (len off-t))
 219   (define-call "mkfifo" int minusp (pathname filename) (mode mode-t))
 220   (define-call "symlink" int minusp (oldpath filename) (newpath filename))
 221   (define-call "sync" void never-fails)
 222   (define-call ("truncate" :options :largefile)
 223       int minusp (pathname filename) (length off-t))
 224   ;; FIXME: Windows does have _mktemp, which has a slightlty different
 225   ;; interface
 226   (defun mkstemp (template)
 227     ;; we are emulating sb-alien's charset conversion for strings
 228     ;; here, to accommodate for the call-by-reference nature of
 229     ;; mkstemp's template strings.
 230     (let ((arg (sb-ext:string-to-octets
 231                 (filename template)
 232                 :external-format sb-alien::*default-c-string-external-format*)))
 233       (sb-sys:with-pinned-objects (arg)
 234         (let ((result (alien-funcall (extern-alien "mkstemp"
 235                                                    (function int c-string))
 236                                      (sap-alien (sb-alien::vector-sap arg)
 237                                                 (* char)))))
 238           (when (minusp result)
 239             (syscall-error))
 240           (values result
 241                   (sb-ext:octets-to-string
 242                    arg
 243                    :external-format sb-alien::*default-c-string-external-format*))))))
 244   (define-call-internally ioctl-without-arg "ioctl" int minusp
 245                           (fd file-descriptor) (cmd int))
 246   (define-call-internally ioctl-with-int-arg "ioctl" int minusp
 247                           (fd file-descriptor) (cmd int) (arg int))
 248   (define-call-internally ioctl-with-pointer-arg "ioctl" int minusp
 249                           (fd file-descriptor) (cmd int)
 250                           (arg alien-pointer-to-anything-or-nil))
 251   (define-entry-point "ioctl" (fd cmd &optional (arg nil argp))
 252     (if argp
 253         (etypecase arg
 254           ((alien int) (ioctl-with-int-arg fd cmd arg))
 255           ((or (alien (* t)) null) (ioctl-with-pointer-arg fd cmd arg)))
 256         (ioctl-without-arg fd cmd)))
 257   (define-call-internally fcntl-without-arg "fcntl" int minusp
 258                           (fd file-descriptor) (cmd int))
 259   (define-call-internally fcntl-with-int-arg "fcntl" int minusp
 260                           (fd file-descriptor) (cmd int) (arg int))
 261   (define-call-internally fcntl-with-pointer-arg "fcntl" int minusp
 262                           (fd file-descriptor) (cmd int)
 263                           (arg alien-pointer-to-anything-or-nil))
 264   (define-entry-point "fcntl" (fd cmd &optional (arg nil argp))
 265     (if argp
 266         (etypecase arg
 267           ((alien int) (fcntl-with-int-arg fd cmd arg))
 268           ((or (alien (* t)) null) (fcntl-with-pointer-arg fd cmd arg)))
 269         (fcntl-without-arg fd cmd)))
 270
 271   ;; uid, gid
 272   (define-call "geteuid" uid-t never-fails) ; "always successful", it says
 273   (define-call "getresuid" uid-t never-fails)
 274   (define-call "getuid" uid-t never-fails)
 275   (define-call "seteuid" int minusp (uid uid-t))
 276   (define-call "setfsuid" int minusp (uid uid-t))
 277   (define-call "setreuid" int minusp (ruid uid-t) (euid uid-t))
 278   (define-call "setresuid" int minusp (ruid uid-t) (euid uid-t) (suid uid-t))
 279   (define-call "setuid" int minusp (uid uid-t))
 280   (define-call "getegid" gid-t never-fails)
 281   (define-call "getgid" gid-t never-fails)
 282   (define-call "getresgid" gid-t never-fails)
 283   (define-call "setegid" int minusp (gid gid-t))
 284   (define-call "setfsgid" int minusp (gid gid-t))
 285   (define-call "setgid" int minusp (gid gid-t))
 286   (define-call "setregid" int minusp (rgid gid-t) (egid gid-t))
 287   (define-call "setresgid" int minusp (rgid gid-t) (egid gid-t) (sgid gid-t))
 288
 289   ;; processes, signals
 290   (define-call "alarm" int never-fails (seconds unsigned))
 291
 292
 293
 294   #+mach-exception-handler
 295   (progn
 296     ;; FIXME this is a lie, of course this can fail, but there's no
 297     ;; error handling here yet!
 298     (define-call "setup_mach_exceptions" void never-fails)
 299     (define-call ("posix_fork" :c-name "fork") pid-t minusp)
 300     (defun fork ()
 301       (let ((pid (posix-fork)))
 302         (when (= pid 0)
 303           (setup-mach-exceptions))
 304         pid))
 305     (export 'fork :sb-posix))
 306
 307   #-mach-exception-handler
 308   (define-call "fork" pid-t minusp)
 309
 310   (define-call "getpgid" pid-t minusp (pid pid-t))
 311   (define-call "getppid" pid-t never-fails)
 312   (define-call "getpgrp" pid-t never-fails)
 313   (define-call "getsid" pid-t minusp  (pid pid-t))
 314   (define-call "kill" int minusp (pid pid-t) (signal int))
 315   (define-call "killpg" int minusp (pgrp int) (signal int))
 316   (define-call "pause" int minusp)
 317   (define-call "setpgid" int minusp (pid pid-t) (pgid pid-t))
 318   (define-call "setpgrp" int minusp))
 319
 320 (defmacro with-growing-c-string ((buffer size) &body body)
 321   (sb-int:with-unique-names (c-string-block)
 322     `(block ,c-string-block
 323        (let (,buffer)
 324          (flet ((,buffer (&optional (size-incl-null))
 325                   (when size-incl-null
 326                     (setf (sb-sys:sap-ref-8 (sb-alien:alien-sap ,buffer) size-incl-null)
 327                           0))
 328                   (return-from ,c-string-block
 329                     (sb-alien::c-string-to-string
 330                      (sb-alien:alien-sap ,buffer)
 331                      (sb-impl::default-external-format)
 332                      'character))))
 333            (loop for ,size = 128 then (* 2 ,size)
 334                  do (unwind-protect
 335                          (progn
 336                            (setf ,buffer (make-alien c-string ,size))
 337                            ,@body)
 338                       (when ,buffer
 339                         (free-alien ,buffer)))))))))
 340
 341 #-win32
 342 (progn
 343   (export 'readlink :sb-posix)
 344   (defun readlink (pathspec)
 345     "Returns the resolved target of a symbolic link as a string."
 346     (flet ((%readlink (path buf length)
 347              (alien-funcall
 348               (extern-alien "readlink" (function int c-string (* t) int))
 349               path buf length)))
 350       (with-growing-c-string (buf size)
 351         (let ((count (%readlink (filename pathspec) buf size)))
 352           (cond ((minusp count)
 353                  (syscall-error))
 354                 ((< 0 count size)
 355                  (buf count))))))))
 356
 357 (progn
 358   (export 'getcwd :sb-posix)
 359   (defun getcwd ()
 360     "Returns the process's current working directory as a string."
 361     (flet ((%getcwd (buffer size)
 362              (alien-funcall
 363               (extern-alien #-win32 "getcwd"
 364                             #+win32 "_getcwd" (function c-string (* t) int))
 365               buffer size)))
 366       (with-growing-c-string (buf size)
 367         (let ((result (%getcwd buf size)))
 368           (cond (result
 369                  (buf))
 370                 ((/= (get-errno) sb-posix:erange)
 371                  (syscall-error))))))))
 372
 373 #-win32
 374 (progn
 375  (export 'wait :sb-posix)
 376  (declaim (inline wait))
 377  (defun wait (&optional statusptr)
 378    (declare (type (or null (simple-array (signed-byte 32) (1))) statusptr))
 379    (let* ((ptr (or statusptr (make-array 1 :element-type '(signed-byte 32))))
 380           (pid (sb-sys:with-pinned-objects (ptr)
 381                  (alien-funcall
 382                   (extern-alien "wait" (function pid-t (* int)))
 383                   (sb-sys:vector-sap ptr)))))
 384      (if (minusp pid)
 385          (syscall-error)
 386          (values pid (aref ptr 0))))))
 387
 388 #-win32
 389 (progn
 390  (export 'waitpid :sb-posix)
 391  (declaim (inline waitpid))
 392  (defun waitpid (pid options &optional statusptr)
 393    (declare (type (sb-alien:alien pid-t) pid)
 394             (type (sb-alien:alien int) options)
 395             (type (or null (simple-array (signed-byte 32) (1))) statusptr))
 396    (let* ((ptr (or statusptr (make-array 1 :element-type '(signed-byte 32))))
 397           (pid (sb-sys:with-pinned-objects (ptr)
 398                  (alien-funcall
 399                   (extern-alien "waitpid" (function pid-t
 400                                                     pid-t (* int) int))
 401                   pid (sb-sys:vector-sap ptr) options))))
 402      (if (minusp pid)
 403          (syscall-error)
 404          (values pid (aref ptr 0)))))
 405  ;; waitpid macros
 406  (define-call "wifexited" boolean never-fails (status int))
 407  (define-call "wexitstatus" int never-fails (status int))
 408  (define-call "wifsignaled" boolean never-fails (status int))
 409  (define-call "wtermsig" int never-fails (status int))
 410  (define-call "wifstopped" boolean never-fails (status int))
 411  (define-call "wstopsig" int never-fails (status int))
 412  #+nil ; see alien/waitpid-macros.c
 413  (define-call "wifcontinued" boolean never-fails (status int)))
 414
 415 ;;; mmap, msync
 416 #-win32
 417 (progn
 418  (define-call ("mmap" :options :largefile) sb-sys:system-area-pointer
 419    (lambda (res)
 420      (= (sb-sys:sap-int res) #.(1- (expt 2 sb-vm::n-machine-word-bits))))
 421    (addr sap-or-nil) (length unsigned) (prot unsigned)
 422    (flags unsigned) (fd file-descriptor) (offset off-t))
 423
 424  (define-call "munmap" int minusp
 425    (start sb-sys:system-area-pointer) (length unsigned))
 426
 427 (define-call "msync" int minusp
 428   (addr sb-sys:system-area-pointer) (length unsigned) (flags int)))
 429
 430 #-win32
 431 (define-call "getpagesize" int minusp)
 432 #+win32
 433 ;;; KLUDGE: This could be taken from GetSystemInfo
 434 (export (defun getpagesize () 4096))
 435
 436 ;;; passwd database
 437 ;; The docstrings are copied from the descriptions in SUSv3,
 438 ;; where present.
 439 #-win32
 440 (define-protocol-class passwd alien-passwd ()
 441   ((name :initarg :name :accessor passwd-name
 442          :documentation "User's login name.")
 443    ;; Note: SUSv3 doesn't require this member.
 444    (passwd :initarg :passwd :accessor passwd-passwd
 445            :documentation "The account's encrypted password.")
 446    (uid :initarg :uid :accessor passwd-uid
 447         :documentation "Numerical user ID.")
 448    (gid :initarg :gid :accessor passwd-gid
 449         :documentation "Numerical group ID.")
 450    ;; Note: SUSv3 doesn't require this member.
 451    (gecos :initarg :gecos :accessor passwd-gecos
 452           :documentation "User's name or comment field.")
 453    (dir :initarg :dir :accessor passwd-dir
 454         :documentation "Initial working directory.")
 455    (shell :initarg :shell :accessor passwd-shell
 456           :documentation "Program to use as shell."))
 457   (:documentation "Instances of this class represent entries in
 458                    the system's user database."))
 459
 460 (defmacro define-pw-call (name arg type)
 461   #-win32
 462   ;; FIXME: this isn't the documented way of doing this, surely?
 463   (let ((lisp-name (intern (string-upcase name) :sb-posix)))
 464     `(progn
 465       (export ',lisp-name :sb-posix)
 466       (declaim (inline ,lisp-name))
 467       (defun ,lisp-name (,arg)
 468         (let ((r (alien-funcall (extern-alien ,name ,type) ,arg)))
 469           (if (null-alien r)
 470               nil
 471               (alien-to-passwd r)))))))
 472
 473 (define-pw-call "getpwnam" login-name (function (* alien-passwd) c-string))
 474 (define-pw-call "getpwuid" uid (function (* alien-passwd) uid-t))
 475
 476 ;;; group database
 477 #-win32
 478 (define-protocol-class group alien-group ()
 479   ((name :initarg :name :accessor group-name)
 480    (passwd :initarg :passwd :accessor group-passwd)
 481    (gid :initarg :gid :accessor group-gid)))
 482
 483 (defmacro define-gr-call (name arg type)
 484   #-win32
 485   ;; FIXME: this isn't the documented way of doing this, surely?
 486   (let ((lisp-name (intern (string-upcase name) :sb-posix)))
 487     `(progn
 488       (export ',lisp-name :sb-posix)
 489       (declaim (inline ,lisp-name))
 490       (defun ,lisp-name (,arg)
 491         (let ((r (alien-funcall (extern-alien ,name ,type) ,arg)))
 492           (if (null-alien r)
 493               nil
 494               (alien-to-group r)))))))
 495
 496 (define-gr-call "getgrnam" login-name (function (* alien-group) c-string))
 497 (define-gr-call "getgrgid" gid (function (* alien-group) gid-t))
 498
 499
 500 #-win32
 501 (define-protocol-class timeval alien-timeval ()
 502   ((sec :initarg :tv-sec :accessor timeval-sec
 503         :documentation "Seconds.")
 504    (usec :initarg :tv-usec :accessor timeval-usec
 505          :documentation "Microseconds."))
 506   (:documentation "Instances of this class represent time values."))
 507
 508 (define-protocol-class stat alien-stat ()
 509   ((mode :initarg :mode :reader stat-mode
 510          :documentation "Mode of file.")
 511    (ino :initarg :ino :reader stat-ino
 512         :documentation "File serial number.")
 513    (dev :initarg :dev :reader stat-dev
 514         :documentation "Device ID of device containing file.")
 515    (nlink :initarg :nlink :reader stat-nlink
 516           :documentation "Number of hard links to the file.")
 517    (uid :initarg :uid :reader stat-uid
 518         :documentation "User ID of file.")
 519    (gid :initarg :gid :reader stat-gid
 520         :documentation "Group ID of file.")
 521    (size :initarg :size :reader stat-size
 522          :documentation "For regular files, the file size in
 523                          bytes.  For symbolic links, the length
 524                          in bytes of the filename contained in
 525                          the symbolic link.")
 526    (atime :initarg :atime :reader stat-atime
 527           :documentation "Time of last access.")
 528    (mtime :initarg :mtime :reader stat-mtime
 529           :documentation "Time of last data modification.")
 530    (ctime :initarg :ctime :reader stat-ctime
 531           :documentation "Time of last status change"))
 532   (:documentation "Instances of this class represent Posix file
 533                    metadata."))
 534
 535 (defmacro define-stat-call (name arg designator-fun type)
 536   ;; FIXME: this isn't the documented way of doing this, surely?
 537   (let ((lisp-name (lisp-for-c-symbol name)))
 538     `(progn
 539       (export ',lisp-name :sb-posix)
 540       (declaim (inline ,lisp-name))
 541       (defun ,lisp-name (,arg &optional stat)
 542         (declare (type (or null stat) stat))
 543         (with-alien-stat a-stat ()
 544           (let ((r (alien-funcall
 545                     (extern-alien ,(real-c-name (list name :options :largefile)) ,type)
 546                     (,designator-fun ,arg)
 547                     a-stat)))
 548             (when (minusp r)
 549               (syscall-error))
 550             (alien-to-stat a-stat stat)))))))
 551
 552 (define-stat-call #-win32 "stat" #+win32 "_stat"
 553                   pathname filename
 554                   (function int c-string (* alien-stat)))
 555
 556 #-win32
 557 (define-stat-call "lstat"
 558                   pathname filename
 559                   (function int c-string (* alien-stat)))
 560 ;;; No symbolic links on Windows, so use stat
 561 #+win32
 562 (progn
 563   (declaim (inline lstat))
 564   (export (defun lstat (filename &optional stat)
 565             (if stat (stat filename stat) (stat filename)))))
 566
 567 (define-stat-call #-win32 "fstat" #+win32 "_fstat"
 568                   fd file-descriptor
 569                   (function int int (* alien-stat)))
 570
 571
 572 ;;; mode flags
 573 (define-call "s_isreg" boolean never-fails (mode mode-t))
 574 (define-call "s_isdir" boolean never-fails (mode mode-t))
 575 (define-call "s_ischr" boolean never-fails (mode mode-t))
 576 (define-call "s_isblk" boolean never-fails (mode mode-t))
 577 (define-call "s_isfifo" boolean never-fails (mode mode-t))
 578 (define-call "s_islnk" boolean never-fails (mode mode-t))
 579 (define-call "s_issock" boolean never-fails (mode mode-t))
 580
 581 #-win32
 582 (progn
 583  (export 'pipe :sb-posix)
 584  (declaim (inline pipe))
 585  (defun pipe (&optional filedes2)
 586    (declare (type (or null (simple-array (signed-byte 32) (2))) filedes2))
 587    (unless filedes2
 588      (setq filedes2 (make-array 2 :element-type '(signed-byte 32))))
 589    (let ((r (sb-sys:with-pinned-objects (filedes2)
 590               (alien-funcall
 591                ;; FIXME: (* INT)?  (ARRAY INT 2) would be better
 592                (extern-alien "pipe" (function int (* int)))
 593                (sb-sys:vector-sap filedes2)))))
 594      (when (minusp r)
 595        (syscall-error)))
 596    (values (aref filedes2 0) (aref filedes2 1))))
 597
 598 #-win32
 599 (define-protocol-class termios alien-termios ()
 600   ((iflag :initarg :iflag :accessor sb-posix:termios-iflag
 601           :documentation "Input modes.")
 602    (oflag :initarg :oflag :accessor sb-posix:termios-oflag
 603           :documentation "Output modes.")
 604    (cflag :initarg :cflag :accessor sb-posix:termios-cflag
 605           :documentation "Control modes.")
 606    (lflag :initarg :lflag :accessor sb-posix:termios-lflag
 607           :documentation "Local modes.")
 608    (cc :initarg :cc :accessor sb-posix:termios-cc :array-length nccs
 609        :documentation "Control characters"))
 610   (:documentation "Instances of this class represent I/O
 611                    characteristics of the terminal."))
 612
 613 #-win32
 614 (progn
 615  (export 'tcsetattr :sb-posix)
 616  (declaim (inline tcsetattr))
 617  (defun tcsetattr (fd actions termios)
 618    (declare (type termios termios))
 619    (with-alien-termios a-termios ()
 620      (termios-to-alien termios a-termios)
 621      (let ((fd (file-descriptor fd)))
 622        (let* ((r (alien-funcall
 623                   (extern-alien
 624                    "tcsetattr"
 625                    (function int int int (* alien-termios)))
 626                   fd actions a-termios)))
 627          (when (minusp r)
 628            (syscall-error)))
 629        (values))))
 630  (export 'tcgetattr :sb-posix)
 631  (declaim (inline tcgetattr))
 632  (defun tcgetattr (fd &optional termios)
 633    (declare (type (or null termios) termios))
 634    (with-alien-termios a-termios ()
 635      (let ((r (alien-funcall
 636                (extern-alien "tcgetattr"
 637                              (function int int (* alien-termios)))
 638                (file-descriptor fd)
 639                a-termios)))
 640        (when (minusp r)
 641          (syscall-error))
 642        (setf termios (alien-to-termios a-termios termios))))
 643    termios)
 644  (export 'cfsetispeed :sb-posix)
 645  (declaim (inline cfsetispeed))
 646  (defun cfsetispeed (speed &optional termios)
 647    (declare (type (or null termios) termios))
 648    (with-alien-termios a-termios ()
 649      (let ((r (alien-funcall
 650                (extern-alien "cfsetispeed"
 651                              (function int (* alien-termios) speed-t))
 652                a-termios
 653                speed)))
 654        (when (minusp r)
 655          (syscall-error))
 656        (setf termios (alien-to-termios a-termios termios))))
 657    termios)
 658  (export 'cfsetospeed :sb-posix)
 659  (declaim (inline cfsetospeed))
 660  (defun cfsetospeed (speed &optional termios)
 661    (declare (type (or null termios) termios))
 662    (with-alien-termios a-termios ()
 663      (let ((r (alien-funcall
 664                (extern-alien "cfsetospeed"
 665                              (function int (* alien-termios) speed-t))
 666                a-termios
 667                speed)))
 668        (when (minusp r)
 669          (syscall-error))
 670        (setf termios (alien-to-termios a-termios termios))))
 671    termios)
 672  (export 'cfgetispeed :sb-posix)
 673  (declaim (inline cfgetispeed))
 674  (defun cfgetispeed (termios)
 675    (declare (type termios termios))
 676    (with-alien-termios a-termios ()
 677      (termios-to-alien termios a-termios)
 678      (alien-funcall (extern-alien "cfgetispeed"
 679                                   (function speed-t (* alien-termios)))
 680                     a-termios)))
 681  (export 'cfgetospeed :sb-posix)
 682  (declaim (inline cfgetospeed))
 683  (defun cfgetospeed (termios)
 684    (declare (type termios termios))
 685    (with-alien-termios a-termios ()
 686      (termios-to-alien termios a-termios)
 687      (alien-funcall (extern-alien "cfgetospeed"
 688                                  (function speed-t (* alien-termios)))
 689                     a-termios))))
 690
 691
 692 #-win32
 693 (progn
 694   (export 'time :sb-posix)
 695   (defun time ()
 696     (let ((result (alien-funcall (extern-alien "time"
 697                                                (function time-t (* time-t)))
 698                                  nil)))
 699       (if (minusp result)
 700           (syscall-error)
 701           result)))
 702   (export 'utime :sb-posix)
 703   (defun utime (filename &optional access-time modification-time)
 704     (let ((fun (extern-alien "utime" (function int c-string
 705                                                (* alien-utimbuf))))
 706           (name (filename filename)))
 707       (if (not (and access-time modification-time))
 708           (alien-funcall fun name nil)
 709           (with-alien ((utimbuf (struct alien-utimbuf)))
 710             (setf (slot utimbuf 'actime) (or access-time 0)
 711                   (slot utimbuf 'modtime) (or modification-time 0))
 712             (let ((result (alien-funcall fun name (alien-sap utimbuf))))
 713               (if (minusp result)
 714                   (syscall-error)
 715                   result))))))
 716   (export 'utimes :sb-posix)
 717   (defun utimes (filename &optional access-time modification-time)
 718     (flet ((seconds-and-useconds (time)
 719              (multiple-value-bind (integer fractional)
 720                  (cl:truncate time)
 721                (values integer (cl:truncate (* fractional 1000000)))))
 722            (maybe-syscall-error (value)
 723              (if (minusp value)
 724                  (syscall-error)
 725                  value)))
 726       (let ((fun (extern-alien "utimes" (function int c-string
 727                                                   (* (array alien-timeval 2)))))
 728             (name (filename filename)))
 729         (if (not (and access-time modification-time))
 730             (maybe-syscall-error (alien-funcall fun name nil))
 731             (with-alien ((buf (array alien-timeval 2)))
 732               (let ((actime (deref buf 0))
 733                     (modtime (deref buf 1)))
 734                 (setf (values (slot actime 'sec)
 735                               (slot actime 'usec))
 736                       (seconds-and-useconds (or access-time 0))
 737                       (values (slot modtime 'sec)
 738                               (slot modtime 'usec))
 739                       (seconds-and-useconds (or modification-time 0)))
 740                 (maybe-syscall-error (alien-funcall fun name
 741                                                     (alien-sap buf))))))))))
 742
 743
 744 ;;; environment
 745
 746 (export 'getenv :sb-posix)
 747 (defun getenv (name)
 748   (let ((r (alien-funcall
 749             (extern-alien "getenv" (function (* char) c-string))
 750             name)))
 751     (declare (type (alien (* char)) r))
 752     (unless (null-alien r)
 753       (cast r c-string))))
 754 (define-call "putenv" int minusp (string c-string))
 755
 756 ;;; syslog
 757 #-win32
 758 (progn
 759   (export 'openlog :sb-posix)
 760   (export 'syslog :sb-posix)
 761   (export 'closelog :sb-posix)
 762   (defun openlog (ident options &optional (facility log-user))
 763     (alien-funcall (extern-alien
 764                     "openlog" (function void c-string int int))
 765                    ident options facility))
 766   (defun syslog (priority format &rest args)
 767     "Send a message to the syslog facility, with severity level
 768 PRIORITY.  The message will be formatted as by CL:FORMAT (rather
 769 than C's printf) with format string FORMAT and arguments ARGS."
 770     (flet ((syslog1 (priority message)
 771              (alien-funcall (extern-alien
 772                              "syslog" (function void int c-string c-string))
 773                             priority "%s" message)))
 774       (syslog1 priority (apply #'format nil format args))))
 775   (define-call "closelog" void never-fails))