1 ;;;; This file contains Unix support that SBCL needs to implement
2 ;;;; itself. It's derived from Peter Van Eynde's unix-glibc2.lisp for
3 ;;;; CMU CL, which was derived from CMU CL unix.lisp 1.56. But those
4 ;;;; files aspired to be complete Unix interfaces exported to the end
5 ;;;; user, while this file aims to be as simple as possible and is not
6 ;;;; intended for the end user.
8 ;;;; FIXME: The old CMU CL unix.lisp code was implemented as hand
9 ;;;; transcriptions from Unix headers into Lisp. It appears that this was as
10 ;;;; unmaintainable in practice as you'd expect in theory, so I really really
11 ;;;; don't want to do that. It'd be good to implement the various system calls
12 ;;;; as C code implemented using the Unix header files, and have their
13 ;;;; interface back to SBCL code be characterized by things like "32-bit-wide
14 ;;;; int" which are already in the interface between the runtime
15 ;;;; executable and the SBCL lisp code.
17 ;;;; This software is part of the SBCL system. See the README file for
18 ;;;; more information.
20 ;;;; This software is derived from the CMU CL system, which was
21 ;;;; written at Carnegie Mellon University and released into the
22 ;;;; public domain. The software is in the public domain and is
23 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
24 ;;;; files for more information.
26 (in-package "SB!UNIX")
28 (/show0 "unix.lisp 21")
30 (defmacro def-enum (inc cur &rest names)
31 (flet ((defform (name)
32 (prog1 (when name `(defconstant ,name ,cur))
33 (setf cur (funcall inc cur 1)))))
34 `(progn ,@(mapcar #'defform names))))
36 ;;; Given a C-level zero-terminated array of C strings, return a
37 ;;; corresponding Lisp-level list of SIMPLE-STRINGs.
38 (defun c-strings->string-list (c-strings)
39 (declare (type (alien (* c-string)) c-strings))
40 (let ((reversed-result nil))
41 (dotimes (i most-positive-fixnum (error "argh! can't happen"))
42 (declare (type index i))
43 (let ((c-string (deref c-strings i)))
45 (push c-string reversed-result)
46 (return (nreverse reversed-result)))))))
48 ;;;; Lisp types used by syscalls
50 (deftype unix-pathname () 'simple-string)
51 (deftype unix-fd () `(integer 0 ,most-positive-fixnum))
53 (deftype unix-file-mode () '(unsigned-byte 32))
54 (deftype unix-pid () '(unsigned-byte 32))
55 (deftype unix-uid () '(unsigned-byte 32))
56 (deftype unix-gid () '(unsigned-byte 32))
60 (/show0 "unix.lisp 74")
62 ;;; FIXME: The various FOO-SYSCALL-BAR macros, and perhaps some other
63 ;;; macros in this file, are only used in this file, and could be
64 ;;; implemented using SB!XC:DEFMACRO wrapped in EVAL-WHEN.
66 (defmacro syscall ((name &rest arg-types) success-form &rest args)
67 `(let ((result (alien-funcall (extern-alien ,name (function int ,@arg-types))
70 (values nil (get-errno))
73 ;;; This is like SYSCALL, but if it fails, signal an error instead of
74 ;;; returning error codes. Should only be used for syscalls that will
75 ;;; never really get an error.
76 (defmacro syscall* ((name &rest arg-types) success-form &rest args)
77 `(let ((result (alien-funcall (extern-alien ,name (function int ,@arg-types))
80 (error "Syscall ~A failed: ~A" ,name (strerror))
83 (/show0 "unix.lisp 109")
85 (defmacro void-syscall ((name &rest arg-types) &rest args)
86 `(syscall (,name ,@arg-types) (values t 0) ,@args))
88 (defmacro int-syscall ((name &rest arg-types) &rest args)
89 `(syscall (,name ,@arg-types) (values result 0) ,@args))
91 ;;;; hacking the Unix environment
93 (def-alien-routine ("getenv" posix-getenv) c-string
94 "Return the environment string \"name=value\" which corresponds to NAME, or
95 NIL if there is none."
100 ;;; Rename the file with string NAME1 to the string NAME2. NIL and an
101 ;;; error code is returned if an error occurs.
102 (defun unix-rename (name1 name2)
103 (declare (type unix-pathname name1 name2))
104 (void-syscall ("rename" c-string c-string) name1 name2))
106 ;;; from sys/types.h and gnu/types.h
108 (/show0 "unix.lisp 220")
110 ;;; FIXME: Isn't there some way to use a C wrapper to avoid this hand-copying?
111 (defconstant +max-s-long+ 2147483647)
112 (defconstant +max-u-long+ 4294967295)
113 (def-alien-type quad-t #+nil long-long #-nil (array long 2))
114 (def-alien-type uquad-t #+nil unsigned-long-long
115 #-nil (array unsigned-long 2))
116 (def-alien-type qaddr-t (* quad-t))
117 (def-alien-type daddr-t int)
118 (def-alien-type caddr-t (* char))
119 (def-alien-type swblk-t long)
120 (def-alien-type size-t unsigned-int)
121 (def-alien-type ssize-t int)
123 ;;; FIXME: We shouldn't hand-copy types from header files into Lisp like this
124 ;;; unless we have extreme provocation. Reading directories is not extreme
125 ;;; enough, since it doesn't need to be blindingly fast: we can just implement
126 ;;; those functions in C as a wrapper layer.
127 (def-alien-type fd-mask unsigned-long)
129 (eval-when (:compile-toplevel :load-toplevel :execute)
130 (defconstant fd-setsize 1024))
134 (fds-bits (array fd-mask #.(/ fd-setsize 32)))))
136 (/show0 "unix.lisp 304")
141 ;;;; POSIX Standard: 6.5 File Control Operations <fcntl.h>
143 ;;; Open the file whose pathname is specified by PATH for reading
144 ;;; and/or writing as specified by the FLAGS argument. Various FLAGS
145 ;;; masks (O_RDONLY etc.) are defined in fcntlbits.h.
147 ;;; If the O_CREAT flag is specified, then the file is created with a
148 ;;; permission of argument MODE if the file doesn't exist. An integer
149 ;;; file descriptor is returned by UNIX-OPEN.
150 (defun unix-open (path flags mode)
151 (declare (type unix-pathname path)
153 (type unix-file-mode mode))
154 (int-syscall ("open" c-string int int) path flags mode))
156 ;;; UNIX-CLOSE accepts a file descriptor and attempts to close the file
157 ;;; associated with it.
158 (/show0 "unix.lisp 391")
159 (defun unix-close (fd)
160 (declare (type unix-fd fd))
161 (void-syscall ("close" int) fd))
165 ;; A time value that is accurate to the nearest
166 ;; microsecond but also has a range of years.
169 (tv-sec time-t) ; seconds
170 (tv-usec time-t))) ; and microseconds
174 (defconstant rusage_self 0) ; the calling process
175 (defconstant rusage_children -1) ; terminated child processes
176 (defconstant rusage_both -2)
180 (ru-utime (struct timeval)) ; user time used
181 (ru-stime (struct timeval)) ; system time used.
182 (ru-maxrss long) ; maximum resident set size (in kilobytes)
183 (ru-ixrss long) ; integral shared memory size
184 (ru-idrss long) ; integral unshared data size
185 (ru-isrss long) ; integral unshared stack size
186 (ru-minflt long) ; page reclaims
187 (ru-majflt long) ; page faults
188 (ru-nswap long) ; swaps
189 (ru-inblock long) ; block input operations
190 (ru-oublock long) ; block output operations
191 (ru-msgsnd long) ; messages sent
192 (ru-msgrcv long) ; messages received
193 (ru-nsignals long) ; signals received
194 (ru-nvcsw long) ; voluntary context switches
195 (ru-nivcsw long))) ; involuntary context switches
199 ;;; Given a file path (a string) and one of four constant modes,
200 ;;; return T if the file is accessible with that mode and NIL if not.
201 ;;; When NIL, also return an errno value with NIL which tells why the
202 ;;; file was not accessible.
204 ;;; The access modes are:
205 ;;; r_ok Read permission.
206 ;;; w_ok Write permission.
207 ;;; x_ok Execute permission.
208 ;;; f_ok Presence of file.
209 (defun unix-access (path mode)
210 (declare (type unix-pathname path)
212 (void-syscall ("access" c-string int) path mode))
214 ;;; values for the second argument to UNIX-LSEEK
215 (defconstant l_set 0) ; to set the file pointer
216 (defconstant l_incr 1) ; to increment the file pointer
217 (defconstant l_xtnd 2) ; to extend the file size
219 ;;; Accept a file descriptor and move the file pointer ahead
220 ;;; a certain offset for that file. WHENCE can be any of the following:
221 ;;; L_SET Set the file pointer.
222 ;;; L_INCR Increment the file pointer.
223 ;;; L_XTND Extend the file size.
224 (defun unix-lseek (fd offset whence)
225 (declare (type unix-fd fd)
226 (type (unsigned-byte 32) offset)
227 (type (integer 0 2) whence))
229 (int-syscall ("lseek" int off-t int) fd offset whence)
230 ;; Need a 64-bit return value type for this. TBD. For now,
231 ;; don't use this with any 2G+ partitions.
233 (int-syscall ("lseek" int unsigned-long unsigned-long int)
236 ;;; UNIX-READ accepts a file descriptor, a buffer, and the length to read.
237 ;;; It attempts to read len bytes from the device associated with fd
238 ;;; and store them into the buffer. It returns the actual number of
240 (defun unix-read (fd buf len)
241 (declare (type unix-fd fd)
242 (type (unsigned-byte 32) len))
244 (int-syscall ("read" int (* char) int) fd buf len))
246 ;;; UNIX-WRITE accepts a file descriptor, a buffer, an offset, and the
247 ;;; length to write. It attempts to write len bytes to the device
248 ;;; associated with fd from the the buffer starting at offset. It returns
249 ;;; the actual number of bytes written.
250 (defun unix-write (fd buf offset len)
251 (declare (type unix-fd fd)
252 (type (unsigned-byte 32) offset len))
253 (int-syscall ("write" int (* char) int)
255 (with-alien ((ptr (* char) (etypecase buf
256 ((simple-array * (*))
260 (addr (deref ptr offset)))
263 ;;; Set up a unix-piping mechanism consisting of an input pipe and an
264 ;;; output pipe. Return two values: if no error occurred the first
265 ;;; value is the pipe to be read from and the second is can be written
266 ;;; to. If an error occurred the first value is NIL and the second the
269 (with-alien ((fds (array int 2)))
270 (syscall ("pipe" (* int))
271 (values (deref fds 0) (deref fds 1))
272 (cast fds (* int)))))
274 ;;; UNIX-CHDIR accepts a directory name and makes that the
275 ;;; current working directory.
276 (defun unix-chdir (path)
277 (declare (type unix-pathname path))
278 (void-syscall ("chdir" c-string) path))
280 (defun unix-mkdir (name mode)
281 (declare (type unix-pathname name)
282 (type unix-file-mode mode))
283 (void-syscall ("mkdir" c-string int) name mode))
285 ;;; Return the current directory as a SIMPLE-STRING.
286 (defun unix-current-directory ()
287 ;; FIXME: Gcc justifiably complains that getwd is dangerous and should
288 ;; not be used; especially with a hardwired 1024 buffer size, yecch.
289 ;; This should be rewritten to use getcwd(3), perhaps by writing
290 ;; a C service routine to do the actual call to getcwd(3) and check
292 (with-alien ((buf (array char 1024)))
293 (values (not (zerop (alien-funcall (extern-alien "getwd"
294 (function int (* char)))
295 (cast buf (* char)))))
296 (cast buf c-string))))
298 ;;; Duplicate an existing file descriptor (given as the argument) and
299 ;;; return it. If FD is not a valid file descriptor, NIL and an error
300 ;;; number are returned.
302 (declare (type unix-fd fd))
303 (int-syscall ("dup" int) fd))
305 ;;; Terminate the current process with an optional error code. If
306 ;;; successful, the call doesn't return. If unsuccessful, the call
307 ;;; returns NIL and an error number.
308 (defun unix-exit (&optional (code 0))
309 (declare (type (signed-byte 32) code))
310 (void-syscall ("exit" int) code))
312 ;;; Return the process id of the current process.
313 (def-alien-routine ("getpid" unix-getpid) int)
315 ;;; Return the real user-id associated with the current process.
316 (def-alien-routine ("getuid" unix-getuid) int)
318 ;;; Invoke readlink(2) on the file name specified by the simple string
319 ;;; PATH. Return up to two values: the contents of the symbolic link
320 ;;; if the call is successful, or NIL and the Unix error number.
321 (defun unix-readlink (path)
322 (declare (type unix-pathname path))
323 (with-alien ((buf (array char 1024)))
324 (syscall ("readlink" c-string (* char) int)
325 (let ((string (make-string result)))
326 (sb!kernel:copy-from-system-area
328 string (* sb!vm:vector-data-offset sb!vm:word-bits)
329 (* result sb!vm:byte-bits))
331 path (cast buf (* char)) 1024)))
333 ;;; UNIX-UNLINK accepts a name and deletes the directory entry for that
334 ;;; name and the file if this is the last link.
335 (defun unix-unlink (name)
336 (declare (type unix-pathname name))
337 (void-syscall ("unlink" c-string) name))
339 ;;; Set the tty-process-group for the unix file-descriptor FD to PGRP.
340 ;;; If not supplied, FD defaults to "/dev/tty".
341 (defun %set-tty-process-group (pgrp &optional fd)
342 (let ((old-sigs (unix-sigblock (sigmask :sigttou
346 (declare (type (unsigned-byte 32) old-sigs))
350 (multiple-value-bind (tty-fd errno) (unix-open "/dev/tty" o_rdwr 0)
352 (multiple-value-prog1
353 (tcsetpgrp tty-fd pgrp)
354 (unix-close tty-fd)))
356 (values nil errno)))))
357 (unix-sigsetmask old-sigs))))
359 ;;; Return the name of the host machine as a string.
360 (defun unix-gethostname ()
361 (with-alien ((buf (array char 256)))
362 (syscall ("gethostname" (* char) int)
364 (cast buf (* char)) 256)))
366 ;;; Write the core image of the file described by FD to disk.
367 (defun unix-fsync (fd)
368 (declare (type unix-fd fd))
369 (void-syscall ("fsync" int) fd))
373 ;;; UNIX-IOCTL performs a variety of operations on open i/o
374 ;;; descriptors. See the UNIX Programmer's Manual for more
376 (defun unix-ioctl (fd cmd arg)
377 (declare (type unix-fd fd)
378 (type (unsigned-byte 32) cmd))
379 (void-syscall ("ioctl" int unsigned-int (* char)) fd cmd arg))
383 ;;; FIXME: All we seem to need is the RUSAGE_SELF version of this.
385 ;;; Like getrusage(2), but return only the system and user time,
386 ;;; and return the seconds and microseconds as separate values.
387 #!-sb-fluid (declaim (inline unix-fast-getrusage))
388 (defun unix-fast-getrusage (who)
389 (declare (values (member t)
390 (unsigned-byte 31) (mod 1000000)
391 (unsigned-byte 31) (mod 1000000)))
392 (with-alien ((usage (struct rusage)))
393 (syscall* ("getrusage" int (* (struct rusage)))
395 (slot (slot usage 'ru-utime) 'tv-sec)
396 (slot (slot usage 'ru-utime) 'tv-usec)
397 (slot (slot usage 'ru-stime) 'tv-sec)
398 (slot (slot usage 'ru-stime) 'tv-usec))
401 ;;; Return information about the resource usage of the process
402 ;;; specified by WHO. WHO can be either the current process
403 ;;; (rusage_self) or all of the terminated child processes
404 ;;; (rusage_children). NIL and an error number is returned if the call
406 (defun unix-getrusage (who)
407 (with-alien ((usage (struct rusage)))
408 (syscall ("getrusage" int (* (struct rusage)))
410 (+ (* (slot (slot usage 'ru-utime) 'tv-sec) 1000000)
411 (slot (slot usage 'ru-utime) 'tv-usec))
412 (+ (* (slot (slot usage 'ru-stime) 'tv-sec) 1000000)
413 (slot (slot usage 'ru-stime) 'tv-usec))
414 (slot usage 'ru-maxrss)
415 (slot usage 'ru-ixrss)
416 (slot usage 'ru-idrss)
417 (slot usage 'ru-isrss)
418 (slot usage 'ru-minflt)
419 (slot usage 'ru-majflt)
420 (slot usage 'ru-nswap)
421 (slot usage 'ru-inblock)
422 (slot usage 'ru-oublock)
423 (slot usage 'ru-msgsnd)
424 (slot usage 'ru-msgrcv)
425 (slot usage 'ru-nsignals)
426 (slot usage 'ru-nvcsw)
427 (slot usage 'ru-nivcsw))
432 (defmacro unix-fast-select (num-descriptors
433 read-fds write-fds exception-fds
434 timeout-secs &optional (timeout-usecs 0))
436 "Perform the UNIX select(2) system call."
437 (declare (type (integer 0 #.FD-SETSIZE) num-descriptors)
438 (type (or (alien (* (struct fd-set))) null)
439 read-fds write-fds exception-fds)
440 (type (or null (unsigned-byte 31)) timeout-secs)
441 (type (unsigned-byte 31) timeout-usecs) )
443 ;; (optimize (speed 3) (safety 0) (inhibit-warnings 3))
444 ;; in the declarations above. If they're important, they should
445 ;; be in a declaration inside the LET expansion, not in the
446 ;; macro compile-time code.
447 `(let ((timeout-secs ,timeout-secs))
448 (with-alien ((tv (struct timeval)))
450 (setf (slot tv 'tv-sec) timeout-secs)
451 (setf (slot tv 'tv-usec) ,timeout-usecs))
452 (int-syscall ("select" int (* (struct fd-set)) (* (struct fd-set))
453 (* (struct fd-set)) (* (struct timeval)))
454 ,num-descriptors ,read-fds ,write-fds ,exception-fds
455 (if timeout-secs (alien-sap (addr tv)) (int-sap 0))))))
457 ;;; UNIX-SELECT accepts sets of file descriptors and waits for an event
458 ;;; to happen on one of them or to time out.
459 (defmacro num-to-fd-set (fdset num)
462 (setf (deref (slot ,fdset 'fds-bits) 0) ,num)
463 ,@(loop for index upfrom 1 below (/ fd-setsize 32)
464 collect `(setf (deref (slot ,fdset 'fds-bits) ,index) 0)))
466 ,@(loop for index upfrom 0 below (/ fd-setsize 32)
467 collect `(setf (deref (slot ,fdset 'fds-bits) ,index)
468 (ldb (byte 32 ,(* index 32)) ,num))))))
470 (defmacro fd-set-to-num (nfds fdset)
472 (deref (slot ,fdset 'fds-bits) 0)
473 (+ ,@(loop for index upfrom 0 below (/ fd-setsize 32)
474 collect `(ash (deref (slot ,fdset 'fds-bits) ,index)
477 ;;; Examine the sets of descriptors passed as arguments to see whether
478 ;;; they are ready for reading and writing. See the UNIX Programmer's
479 ;;; Manual for more information.
480 (defun unix-select (nfds rdfds wrfds xpfds to-secs &optional (to-usecs 0))
481 (declare (type (integer 0 #.FD-SETSIZE) nfds)
482 (type unsigned-byte rdfds wrfds xpfds)
483 (type (or (unsigned-byte 31) null) to-secs)
484 (type (unsigned-byte 31) to-usecs)
485 (optimize (speed 3) (safety 0) (inhibit-warnings 3)))
486 (with-alien ((tv (struct timeval))
487 (rdf (struct fd-set))
488 (wrf (struct fd-set))
489 (xpf (struct fd-set)))
491 (setf (slot tv 'tv-sec) to-secs)
492 (setf (slot tv 'tv-usec) to-usecs))
493 (num-to-fd-set rdf rdfds)
494 (num-to-fd-set wrf wrfds)
495 (num-to-fd-set xpf xpfds)
496 (macrolet ((frob (lispvar alienvar)
497 `(if (zerop ,lispvar)
499 (alien-sap (addr ,alienvar)))))
500 (syscall ("select" int (* (struct fd-set)) (* (struct fd-set))
501 (* (struct fd-set)) (* (struct timeval)))
503 (fd-set-to-num nfds rdf)
504 (fd-set-to-num nfds wrf)
505 (fd-set-to-num nfds xpf))
506 nfds (frob rdfds rdf) (frob wrfds wrf) (frob xpfds xpf)
507 (if to-secs (alien-sap (addr tv)) (int-sap 0))))))
511 ;;; This is a structure defined in src/runtime/wrap.c, to look
512 ;;; basically like "struct stat" according to stat(2). It may not
513 ;;; actually correspond to the real in-memory stat structure that the
514 ;;; syscall uses, and that's OK. Linux in particular is packed full of
515 ;;; stat macros, and trying to keep Lisp code in correspondence with
516 ;;; it is more pain than it's worth, so we just let our C runtime
517 ;;; synthesize a nice consistent structure for us.
519 ;;; Note that st-dev is a long, not a dev-t. This is because dev-t on
520 ;;; linux 32 bit archs is a 64 bit quantity, but alien doesn's support
521 ;;; those. We don't actually access that field anywhere, though, so
522 ;;; until we can get 64 bit alien support it'll do. Also note that
523 ;;; st_size is a long, not an off-t, because off-t is a 64-bit
524 ;;; quantity on Alpha. And FIXME: "No one would want a file length
525 ;;; longer than 32 bits anyway, right?":-|
528 (st-dev unsigned-long) ; would be dev-t in a real stat
534 (st-rdev unsigned-long) ; would be dev-t in a real stat
535 (st-size unsigned-long) ; would be off-t in a real stat
536 (st-blksize unsigned-long)
537 (st-blocks unsigned-long)
542 ;;; shared C-struct-to-multiple-VALUES conversion for the stat(2)
543 ;;; family of Unix system calls
545 ;;; FIXME: I think this should probably not be INLINE. However, when
546 ;;; this was not inline, it seemed to cause memory corruption
547 ;;; problems. My first guess is that it's a bug in the FFI code, where
548 ;;; the WITH-ALIEN expansion doesn't deal well with being wrapped
549 ;;; around a call to a function returning >10 values. But I didn't try
550 ;;; to figure it out, just inlined it as a quick fix. Perhaps someone
551 ;;; who's motivated to debug the FFI code can go over the DISASSEMBLE
552 ;;; output in the not-inlined case and see whether there's a problem,
553 ;;; and maybe even find a fix..
554 (declaim (inline %extract-stat-results))
555 (defun %extract-stat-results (wrapped-stat)
556 (declare (type (alien (* (struct wrapped_stat))) wrapped-stat))
558 (slot wrapped-stat 'st-dev)
559 (slot wrapped-stat 'st-ino)
560 (slot wrapped-stat 'st-mode)
561 (slot wrapped-stat 'st-nlink)
562 (slot wrapped-stat 'st-uid)
563 (slot wrapped-stat 'st-gid)
564 (slot wrapped-stat 'st-rdev)
565 ;; FIXME: OpenBSD has a 64-bit st_size slot, which is
566 ;; basically a good thing, except that it is too
567 ;; 21st-century for sbcl-0.6.12.8's FFI to handle. As a
568 ;; quick kludgy workaround, we return a 0 placeholder from
569 ;; this function, and downstream we stub out the FILE-LENGTH
570 ;; operation (which is the only place that SBCL actually
571 ;; uses the SIZE value returned from any UNIX-STAT-ish call).
573 #!-openbsd (slot wrapped-stat 'st-size)
574 (slot wrapped-stat 'st-atime)
575 (slot wrapped-stat 'st-mtime)
576 (slot wrapped-stat 'st-ctime)
577 (slot wrapped-stat 'st-blksize)
578 (slot wrapped-stat 'st-blocks)))
580 ;;; Unix system calls in the stat(2) family are implemented as calls
581 ;;; to C-level wrapper functions which copy all the raw "struct
582 ;;; stat" slots into the system-independent wrapped_stat format.
583 ;;; stat(2) <-> stat_wrapper()
584 ;;; fstat(2) <-> fstat_wrapper()
585 ;;; lstat(2) <-> lstat_wrapper()
586 (defun unix-stat (name)
587 (declare (type unix-pathname name))
588 (with-alien ((buf (struct wrapped_stat)))
589 (syscall ("stat_wrapper" c-string (* (struct wrapped_stat)))
590 (%extract-stat-results (addr buf))
592 (defun unix-lstat (name)
593 (declare (type unix-pathname name))
594 (with-alien ((buf (struct wrapped_stat)))
595 (syscall ("lstat_wrapper" c-string (* (struct wrapped_stat)))
596 (%extract-stat-results (addr buf))
598 (defun unix-fstat (fd)
599 (declare (type unix-fd fd))
600 (with-alien ((buf (struct wrapped_stat)))
601 (syscall ("fstat_wrapper" int (* (struct wrapped_stat)))
602 (%extract-stat-results (addr buf))
607 ;; the POSIX.4 structure for a time value. This is like a `struct
608 ;; timeval' but has nanoseconds instead of microseconds.
611 (tv-sec long) ; seconds
612 (tv-nsec long))) ; nanoseconds
614 ;; used by other time functions
617 (tm-sec int) ; Seconds. [0-60] (1 leap second)
618 (tm-min int) ; Minutes. [0-59]
619 (tm-hour int) ; Hours. [0-23]
620 (tm-mday int) ; Day. [1-31]
621 (tm-mon int) ; Month. [0-11]
622 (tm-year int) ; Year - 1900.
623 (tm-wday int) ; Day of week. [0-6]
624 (tm-yday int) ; Days in year.[0-365]
625 (tm-isdst int) ; DST. [-1/0/1]
626 (tm-gmtoff long) ; Seconds east of UTC.
627 (tm-zone c-string))) ; Timezone abbreviation.
629 (def-alien-routine get-timezone sb!c-call:void
630 (when sb!c-call:long :in)
631 (minutes-west sb!c-call:int :out)
632 (daylight-savings-p sb!alien:boolean :out))
634 (defun unix-get-minutes-west (secs)
635 (multiple-value-bind (ignore minutes dst) (get-timezone secs)
636 (declare (ignore ignore) (ignore dst))
639 (defun unix-get-timezone (secs)
640 (multiple-value-bind (ignore minutes dst) (get-timezone secs)
641 (declare (ignore ignore) (ignore minutes))
642 (values (deref unix-tzname (if dst 1 0)))))
647 ;;; Structure crudely representing a timezone. KLUDGE: This is
648 ;;; obsolete and should never be used.
651 (tz-minuteswest int) ; minutes west of Greenwich
652 (tz-dsttime int))) ; type of dst correction
654 ;;; If it works, UNIX-GETTIMEOFDAY returns 5 values: T, the seconds
655 ;;; and microseconds of the current time of day, the timezone (in
656 ;;; minutes west of Greenwich), and a daylight-savings flag. If it
657 ;;; doesn't work, it returns NIL and the errno.
658 #!-sb-fluid (declaim (inline unix-gettimeofday))
659 (defun unix-gettimeofday ()
660 (with-alien ((tv (struct timeval))
661 (tz (struct timezone)))
662 (syscall* ("gettimeofday" (* (struct timeval))
663 (* (struct timezone)))
667 (slot tz 'tz-minuteswest)
668 (slot tz 'tz-dsttime))
673 (defconstant ENOENT 2) ; Unix error code, "No such file or directory"
674 (defconstant EINTR 4) ; Unix error code, "Interrupted system call"
675 (defconstant EIO 5) ; Unix error code, "I/O error"
676 (defconstant EEXIST 17) ; Unix error code, "File exists"
677 (defconstant ESPIPE 29) ; Unix error code, "Illegal seek"
678 (defconstant EWOULDBLOCK 11) ; Unix error code, "Operation would block"
679 ;;; FIXME: Many Unix error code definitions were deleted from the old
680 ;;; CMU CL source code here, but not in the exports of SB-UNIX. I
681 ;;; (WHN) hope that someday I'll figure out an automatic way to detect
682 ;;; unused symbols in package exports, but if I don't, there are
683 ;;; enough of them all in one place here that they should probably be
687 ;;;; support routines for dealing with Unix pathnames
689 (defun unix-file-kind (name &optional check-for-links)
691 "Return either :FILE, :DIRECTORY, :LINK, :SPECIAL, or NIL."
692 (declare (simple-string name))
693 (multiple-value-bind (res dev ino mode)
694 (if check-for-links (unix-lstat name) (unix-stat name))
695 (declare (type (or fixnum null) mode)
698 (let ((kind (logand mode s-ifmt)))
699 (cond ((eql kind s-ifdir) :directory)
700 ((eql kind s-ifreg) :file)
701 ((eql kind s-iflnk) :link)
704 (defun unix-maybe-prepend-current-directory (name)
705 (declare (simple-string name))
706 (if (and (> (length name) 0) (char= (schar name 0) #\/))
708 (multiple-value-bind (win dir) (unix-current-directory)
710 (concatenate 'simple-string dir "/" name)
713 ;;; Return the pathname with all symbolic links resolved.
715 ;;; FIXME: Could we just use Unix readlink(2) instead?
716 (defun unix-resolve-links (pathname)
717 (declare (simple-string pathname))
718 (let ((len (length pathname))
720 (declare (fixnum len) (simple-string pending))
723 (let ((result (make-string 1024 :initial-element (code-char 0)))
727 (let* ((name-end (or (position #\/ pending :start name-start) len))
728 (new-fill-ptr (+ fill-ptr (- name-end name-start))))
729 (replace result pending
734 (let ((kind (unix-file-kind (if (zerop name-end) "/" result) t)))
735 (unless kind (return nil))
736 (cond ((eq kind :link)
737 (multiple-value-bind (link err) (unix-readlink result)
739 (error 'simple-file-error
742 "~@<error reading link ~S: ~2I~_~A~:>"
743 :format-arguments (list (subseq
746 (cond ((or (zerop (length link))
747 (char/= (schar link 0) #\/))
748 ;; It's a relative link.
749 (fill result (code-char 0)
752 ((string= result "/../" :end1 4)
753 ;; It's across the super-root.
754 (let ((slash (or (position #\/ result :start 4)
756 (fill result (code-char 0)
759 (setf fill-ptr slash)))
762 (and (> (length link) 0)
763 (char= (schar link 0) #\/))
764 (fill result (code-char 0) :end new-fill-ptr)
769 (concatenate 'simple-string
771 (subseq pending name-end))))
772 (setf len (length pending))
773 (setf name-start 0)))
775 (return (subseq result 0 new-fill-ptr)))
776 ((eq kind :directory)
777 (setf (schar result new-fill-ptr) #\/)
778 (setf fill-ptr (1+ new-fill-ptr))
779 (setf name-start (1+ name-end)))
781 (return nil))))))))))
783 (defun unix-simplify-pathname (src)
784 (declare (simple-string src))
785 (let* ((src-len (length src))
786 (dst (make-string src-len))
790 (macrolet ((deposit (char)
792 (setf (schar dst dst-len) ,char)
794 (dotimes (src-index src-len)
795 (let ((char (schar src src-index)))
796 (cond ((char= char #\.)
803 ;; Either ``/...' or ``...//...'
805 (setf last-slash dst-len)
808 ;; Either ``./...'' or ``..././...''
813 ((and last-slash (not (zerop last-slash)))
814 ;; There is something before this ..
815 (let ((prev-prev-slash
816 (position #\/ dst :end last-slash :from-end t)))
817 (cond ((and (= (+ (or prev-prev-slash 0) 2)
819 (char= (schar dst (- last-slash 2)) #\.)
820 (char= (schar dst (1- last-slash)) #\.))
821 ;; The something before this .. is another ..
823 (setf last-slash dst-len))
825 ;; The something is some directory or other.
830 (setf last-slash prev-prev-slash)))))
832 ;; There is nothing before this .., so we need to keep it
833 (setf last-slash dst-len)
836 ;; Something other than a dot between slashes.
837 (setf last-slash dst-len)
842 (setf (schar dst dst-len) char)
844 (when (and last-slash (not (zerop last-slash)))
847 ;; We've got ``foobar/.''
850 ;; We've got ``foobar/..''
851 (unless (and (>= last-slash 2)
852 (char= (schar dst (1- last-slash)) #\.)
853 (char= (schar dst (- last-slash 2)) #\.)
855 (char= (schar dst (- last-slash 3)) #\/)))
856 (let ((prev-prev-slash
857 (position #\/ dst :end last-slash :from-end t)))
859 (setf dst-len (1+ prev-prev-slash))
860 (return-from unix-simplify-pathname "./")))))))
861 (cond ((zerop dst-len)
866 (subseq dst 0 dst-len)))))
868 ;;;; stuff not yet found in the header files
870 ;;;; Abandon all hope who enters here...
872 ;;; not checked for linux...
873 (defmacro fd-set (offset fd-set)
874 (let ((word (gensym))
876 `(multiple-value-bind (,word ,bit) (floor ,offset 32)
877 (setf (deref (slot ,fd-set 'fds-bits) ,word)
878 (logior (truly-the (unsigned-byte 32) (ash 1 ,bit))
879 (deref (slot ,fd-set 'fds-bits) ,word))))))
881 ;;; not checked for linux...
882 (defmacro fd-clr (offset fd-set)
883 (let ((word (gensym))
885 `(multiple-value-bind (,word ,bit) (floor ,offset 32)
886 (setf (deref (slot ,fd-set 'fds-bits) ,word)
887 (logand (deref (slot ,fd-set 'fds-bits) ,word)
888 (sb!kernel:32bit-logical-not
889 (truly-the (unsigned-byte 32) (ash 1 ,bit))))))))
891 ;;; not checked for linux...
892 (defmacro fd-isset (offset fd-set)
893 (let ((word (gensym))
895 `(multiple-value-bind (,word ,bit) (floor ,offset 32)
896 (logbitp ,bit (deref (slot ,fd-set 'fds-bits) ,word)))))
898 ;;; not checked for linux...
899 (defmacro fd-zero (fd-set)
901 ,@(loop for index upfrom 0 below (/ fd-setsize 32)
902 collect `(setf (deref (slot ,fd-set 'fds-bits) ,index) 0))))