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: We shouldn't hand-copy types from header files into Lisp
111 ;;; like this unless we have extreme provocation. Reading directories
112 ;;; is not extreme enough, since it doesn't need to be blindingly
113 ;;; fast: we can just implement those functions in C as a wrapper
115 (def-alien-type fd-mask unsigned-long)
117 (eval-when (:compile-toplevel :load-toplevel :execute)
118 (defconstant fd-setsize 1024))
122 (fds-bits (array fd-mask #.(/ fd-setsize 32)))))
124 (/show0 "unix.lisp 304")
129 ;;;; POSIX Standard: 6.5 File Control Operations <fcntl.h>
131 ;;; Open the file whose pathname is specified by PATH for reading
132 ;;; and/or writing as specified by the FLAGS argument. Various FLAGS
133 ;;; masks (O_RDONLY etc.) are defined in fcntlbits.h.
135 ;;; If the O_CREAT flag is specified, then the file is created with a
136 ;;; permission of argument MODE if the file doesn't exist. An integer
137 ;;; file descriptor is returned by UNIX-OPEN.
138 (defun unix-open (path flags mode)
139 (declare (type unix-pathname path)
141 (type unix-file-mode mode))
142 (int-syscall ("open" c-string int int) path flags mode))
144 ;;; UNIX-CLOSE accepts a file descriptor and attempts to close the file
145 ;;; associated with it.
146 (/show0 "unix.lisp 391")
147 (defun unix-close (fd)
148 (declare (type unix-fd fd))
149 (void-syscall ("close" int) fd))
153 ;; A time value that is accurate to the nearest
154 ;; microsecond but also has a range of years.
157 (tv-sec time-t) ; seconds
158 (tv-usec time-t))) ; and microseconds
162 (defconstant rusage_self 0) ; the calling process
163 (defconstant rusage_children -1) ; terminated child processes
164 (defconstant rusage_both -2)
168 (ru-utime (struct timeval)) ; user time used
169 (ru-stime (struct timeval)) ; system time used.
170 (ru-maxrss long) ; maximum resident set size (in kilobytes)
171 (ru-ixrss long) ; integral shared memory size
172 (ru-idrss long) ; integral unshared data size
173 (ru-isrss long) ; integral unshared stack size
174 (ru-minflt long) ; page reclaims
175 (ru-majflt long) ; page faults
176 (ru-nswap long) ; swaps
177 (ru-inblock long) ; block input operations
178 (ru-oublock long) ; block output operations
179 (ru-msgsnd long) ; messages sent
180 (ru-msgrcv long) ; messages received
181 (ru-nsignals long) ; signals received
182 (ru-nvcsw long) ; voluntary context switches
183 (ru-nivcsw long))) ; involuntary context switches
187 ;;; Given a file path (a string) and one of four constant modes,
188 ;;; return T if the file is accessible with that mode and NIL if not.
189 ;;; When NIL, also return an errno value with NIL which tells why the
190 ;;; file was not accessible.
192 ;;; The access modes are:
193 ;;; r_ok Read permission.
194 ;;; w_ok Write permission.
195 ;;; x_ok Execute permission.
196 ;;; f_ok Presence of file.
197 (defun unix-access (path mode)
198 (declare (type unix-pathname path)
200 (void-syscall ("access" c-string int) path mode))
202 ;;; values for the second argument to UNIX-LSEEK
203 (defconstant l_set 0) ; to set the file pointer
204 (defconstant l_incr 1) ; to increment the file pointer
205 (defconstant l_xtnd 2) ; to extend the file size
207 ;;; Accept a file descriptor and move the file pointer ahead
208 ;;; a certain offset for that file. WHENCE can be any of the following:
209 ;;; L_SET Set the file pointer.
210 ;;; L_INCR Increment the file pointer.
211 ;;; L_XTND Extend the file size.
212 (defun unix-lseek (fd offset whence)
213 (declare (type unix-fd fd)
214 (type (unsigned-byte 32) offset)
215 (type (integer 0 2) whence))
217 (int-syscall ("lseek" int off-t int) fd offset whence)
218 ;; Need a 64-bit return value type for this. TBD. For now,
219 ;; don't use this with any 2G+ partitions.
221 (int-syscall ("lseek" int unsigned-long unsigned-long int)
224 ;;; UNIX-READ accepts a file descriptor, a buffer, and the length to read.
225 ;;; It attempts to read len bytes from the device associated with fd
226 ;;; and store them into the buffer. It returns the actual number of
228 (defun unix-read (fd buf len)
229 (declare (type unix-fd fd)
230 (type (unsigned-byte 32) len))
232 (int-syscall ("read" int (* char) int) fd buf len))
234 ;;; UNIX-WRITE accepts a file descriptor, a buffer, an offset, and the
235 ;;; length to write. It attempts to write len bytes to the device
236 ;;; associated with fd from the the buffer starting at offset. It returns
237 ;;; the actual number of bytes written.
238 (defun unix-write (fd buf offset len)
239 (declare (type unix-fd fd)
240 (type (unsigned-byte 32) offset len))
241 (int-syscall ("write" int (* char) int)
243 (with-alien ((ptr (* char) (etypecase buf
244 ((simple-array * (*))
248 (addr (deref ptr offset)))
251 ;;; Set up a unix-piping mechanism consisting of an input pipe and an
252 ;;; output pipe. Return two values: if no error occurred the first
253 ;;; value is the pipe to be read from and the second is can be written
254 ;;; to. If an error occurred the first value is NIL and the second the
257 (with-alien ((fds (array int 2)))
258 (syscall ("pipe" (* int))
259 (values (deref fds 0) (deref fds 1))
260 (cast fds (* int)))))
262 ;;; UNIX-CHDIR accepts a directory name and makes that the
263 ;;; current working directory.
264 (defun unix-chdir (path)
265 (declare (type unix-pathname path))
266 (void-syscall ("chdir" c-string) path))
268 (defun unix-mkdir (name mode)
269 (declare (type unix-pathname name)
270 (type unix-file-mode mode))
271 (void-syscall ("mkdir" c-string int) name mode))
273 ;;; Return the current directory as a SIMPLE-STRING.
274 (defun unix-current-directory ()
275 ;; FIXME: Gcc justifiably complains that getwd is dangerous and should
276 ;; not be used; especially with a hardwired 1024 buffer size, yecch.
277 ;; This should be rewritten to use getcwd(3), perhaps by writing
278 ;; a C service routine to do the actual call to getcwd(3) and check
280 (with-alien ((buf (array char 1024)))
281 (values (not (zerop (alien-funcall (extern-alien "getwd"
282 (function int (* char)))
283 (cast buf (* char)))))
284 (cast buf c-string))))
286 ;;; Duplicate an existing file descriptor (given as the argument) and
287 ;;; return it. If FD is not a valid file descriptor, NIL and an error
288 ;;; number are returned.
290 (declare (type unix-fd fd))
291 (int-syscall ("dup" int) fd))
293 ;;; Terminate the current process with an optional error code. If
294 ;;; successful, the call doesn't return. If unsuccessful, the call
295 ;;; returns NIL and an error number.
296 (defun unix-exit (&optional (code 0))
297 (declare (type (signed-byte 32) code))
298 (void-syscall ("exit" int) code))
300 ;;; Return the process id of the current process.
301 (def-alien-routine ("getpid" unix-getpid) int)
303 ;;; Return the real user-id associated with the current process.
304 (def-alien-routine ("getuid" unix-getuid) int)
306 ;;; Invoke readlink(2) on the file name specified by the simple string
307 ;;; PATH. Return up to two values: the contents of the symbolic link
308 ;;; if the call is successful, or NIL and the Unix error number.
309 (defun unix-readlink (path)
310 (declare (type unix-pathname path))
311 (with-alien ((buf (array char 1024)))
312 (syscall ("readlink" c-string (* char) int)
313 (let ((string (make-string result)))
314 (sb!kernel:copy-from-system-area
316 string (* sb!vm:vector-data-offset sb!vm:word-bits)
317 (* result sb!vm:byte-bits))
319 path (cast buf (* char)) 1024)))
321 ;;; UNIX-UNLINK accepts a name and deletes the directory entry for that
322 ;;; name and the file if this is the last link.
323 (defun unix-unlink (name)
324 (declare (type unix-pathname name))
325 (void-syscall ("unlink" c-string) name))
327 ;;; Set the tty-process-group for the unix file-descriptor FD to PGRP.
328 ;;; If not supplied, FD defaults to "/dev/tty".
329 (defun %set-tty-process-group (pgrp &optional fd)
330 (let ((old-sigs (unix-sigblock (sigmask :sigttou
334 (declare (type (unsigned-byte 32) old-sigs))
338 (multiple-value-bind (tty-fd errno) (unix-open "/dev/tty" o_rdwr 0)
340 (multiple-value-prog1
341 (tcsetpgrp tty-fd pgrp)
342 (unix-close tty-fd)))
344 (values nil errno)))))
345 (unix-sigsetmask old-sigs))))
347 ;;; Return the name of the host machine as a string.
348 (defun unix-gethostname ()
349 (with-alien ((buf (array char 256)))
350 (syscall ("gethostname" (* char) int)
352 (cast buf (* char)) 256)))
354 ;;; Write the core image of the file described by FD to disk.
355 (defun unix-fsync (fd)
356 (declare (type unix-fd fd))
357 (void-syscall ("fsync" int) fd))
361 ;;; UNIX-IOCTL performs a variety of operations on open i/o
362 ;;; descriptors. See the UNIX Programmer's Manual for more
364 (defun unix-ioctl (fd cmd arg)
365 (declare (type unix-fd fd)
366 (type (unsigned-byte 32) cmd))
367 (void-syscall ("ioctl" int unsigned-int (* char)) fd cmd arg))
371 ;;; FIXME: All we seem to need is the RUSAGE_SELF version of this.
373 ;;; Like getrusage(2), but return only the system and user time,
374 ;;; and return the seconds and microseconds as separate values.
375 #!-sb-fluid (declaim (inline unix-fast-getrusage))
376 (defun unix-fast-getrusage (who)
377 (declare (values (member t)
378 (unsigned-byte 31) (mod 1000000)
379 (unsigned-byte 31) (mod 1000000)))
380 (with-alien ((usage (struct rusage)))
381 (syscall* ("getrusage" int (* (struct rusage)))
383 (slot (slot usage 'ru-utime) 'tv-sec)
384 (slot (slot usage 'ru-utime) 'tv-usec)
385 (slot (slot usage 'ru-stime) 'tv-sec)
386 (slot (slot usage 'ru-stime) 'tv-usec))
389 ;;; Return information about the resource usage of the process
390 ;;; specified by WHO. WHO can be either the current process
391 ;;; (rusage_self) or all of the terminated child processes
392 ;;; (rusage_children). NIL and an error number is returned if the call
394 (defun unix-getrusage (who)
395 (with-alien ((usage (struct rusage)))
396 (syscall ("getrusage" int (* (struct rusage)))
398 (+ (* (slot (slot usage 'ru-utime) 'tv-sec) 1000000)
399 (slot (slot usage 'ru-utime) 'tv-usec))
400 (+ (* (slot (slot usage 'ru-stime) 'tv-sec) 1000000)
401 (slot (slot usage 'ru-stime) 'tv-usec))
402 (slot usage 'ru-maxrss)
403 (slot usage 'ru-ixrss)
404 (slot usage 'ru-idrss)
405 (slot usage 'ru-isrss)
406 (slot usage 'ru-minflt)
407 (slot usage 'ru-majflt)
408 (slot usage 'ru-nswap)
409 (slot usage 'ru-inblock)
410 (slot usage 'ru-oublock)
411 (slot usage 'ru-msgsnd)
412 (slot usage 'ru-msgrcv)
413 (slot usage 'ru-nsignals)
414 (slot usage 'ru-nvcsw)
415 (slot usage 'ru-nivcsw))
420 (defmacro unix-fast-select (num-descriptors
421 read-fds write-fds exception-fds
422 timeout-secs &optional (timeout-usecs 0))
424 "Perform the UNIX select(2) system call."
425 (declare (type (integer 0 #.FD-SETSIZE) num-descriptors)
426 (type (or (alien (* (struct fd-set))) null)
427 read-fds write-fds exception-fds)
428 (type (or null (unsigned-byte 31)) timeout-secs)
429 (type (unsigned-byte 31) timeout-usecs) )
431 ;; (optimize (speed 3) (safety 0) (inhibit-warnings 3))
432 ;; in the declarations above. If they're important, they should
433 ;; be in a declaration inside the LET expansion, not in the
434 ;; macro compile-time code.
435 `(let ((timeout-secs ,timeout-secs))
436 (with-alien ((tv (struct timeval)))
438 (setf (slot tv 'tv-sec) timeout-secs)
439 (setf (slot tv 'tv-usec) ,timeout-usecs))
440 (int-syscall ("select" int (* (struct fd-set)) (* (struct fd-set))
441 (* (struct fd-set)) (* (struct timeval)))
442 ,num-descriptors ,read-fds ,write-fds ,exception-fds
443 (if timeout-secs (alien-sap (addr tv)) (int-sap 0))))))
445 ;;; UNIX-SELECT accepts sets of file descriptors and waits for an event
446 ;;; to happen on one of them or to time out.
447 (defmacro num-to-fd-set (fdset num)
450 (setf (deref (slot ,fdset 'fds-bits) 0) ,num)
451 ,@(loop for index upfrom 1 below (/ fd-setsize 32)
452 collect `(setf (deref (slot ,fdset 'fds-bits) ,index) 0)))
454 ,@(loop for index upfrom 0 below (/ fd-setsize 32)
455 collect `(setf (deref (slot ,fdset 'fds-bits) ,index)
456 (ldb (byte 32 ,(* index 32)) ,num))))))
458 (defmacro fd-set-to-num (nfds fdset)
460 (deref (slot ,fdset 'fds-bits) 0)
461 (+ ,@(loop for index upfrom 0 below (/ fd-setsize 32)
462 collect `(ash (deref (slot ,fdset 'fds-bits) ,index)
465 ;;; Examine the sets of descriptors passed as arguments to see whether
466 ;;; they are ready for reading and writing. See the UNIX Programmer's
467 ;;; Manual for more information.
468 (defun unix-select (nfds rdfds wrfds xpfds to-secs &optional (to-usecs 0))
469 (declare (type (integer 0 #.FD-SETSIZE) nfds)
470 (type unsigned-byte rdfds wrfds xpfds)
471 (type (or (unsigned-byte 31) null) to-secs)
472 (type (unsigned-byte 31) to-usecs)
473 (optimize (speed 3) (safety 0) (inhibit-warnings 3)))
474 (with-alien ((tv (struct timeval))
475 (rdf (struct fd-set))
476 (wrf (struct fd-set))
477 (xpf (struct fd-set)))
479 (setf (slot tv 'tv-sec) to-secs)
480 (setf (slot tv 'tv-usec) to-usecs))
481 (num-to-fd-set rdf rdfds)
482 (num-to-fd-set wrf wrfds)
483 (num-to-fd-set xpf xpfds)
484 (macrolet ((frob (lispvar alienvar)
485 `(if (zerop ,lispvar)
487 (alien-sap (addr ,alienvar)))))
488 (syscall ("select" int (* (struct fd-set)) (* (struct fd-set))
489 (* (struct fd-set)) (* (struct timeval)))
491 (fd-set-to-num nfds rdf)
492 (fd-set-to-num nfds wrf)
493 (fd-set-to-num nfds xpf))
494 nfds (frob rdfds rdf) (frob wrfds wrf) (frob xpfds xpf)
495 (if to-secs (alien-sap (addr tv)) (int-sap 0))))))
499 ;;; This is a structure defined in src/runtime/wrap.c, to look
500 ;;; basically like "struct stat" according to stat(2). It may not
501 ;;; actually correspond to the real in-memory stat structure that the
502 ;;; syscall uses, and that's OK. Linux in particular is packed full of
503 ;;; stat macros, and trying to keep Lisp code in correspondence with
504 ;;; it is more pain than it's worth, so we just let our C runtime
505 ;;; synthesize a nice consistent structure for us.
507 ;;; Note that st-dev is a long, not a dev-t. This is because dev-t on
508 ;;; linux 32 bit archs is a 64 bit quantity, but alien doesn's support
509 ;;; those. We don't actually access that field anywhere, though, so
510 ;;; until we can get 64 bit alien support it'll do. Also note that
511 ;;; st_size is a long, not an off-t, because off-t is a 64-bit
512 ;;; quantity on Alpha. And FIXME: "No one would want a file length
513 ;;; longer than 32 bits anyway, right?":-|
516 (st-dev unsigned-long) ; would be dev-t in a real stat
522 (st-rdev unsigned-long) ; would be dev-t in a real stat
523 (st-size unsigned-long) ; would be off-t in a real stat
524 (st-blksize unsigned-long)
525 (st-blocks unsigned-long)
530 ;;; shared C-struct-to-multiple-VALUES conversion for the stat(2)
531 ;;; family of Unix system calls
533 ;;; FIXME: I think this should probably not be INLINE. However, when
534 ;;; this was not inline, it seemed to cause memory corruption
535 ;;; problems. My first guess is that it's a bug in the FFI code, where
536 ;;; the WITH-ALIEN expansion doesn't deal well with being wrapped
537 ;;; around a call to a function returning >10 values. But I didn't try
538 ;;; to figure it out, just inlined it as a quick fix. Perhaps someone
539 ;;; who's motivated to debug the FFI code can go over the DISASSEMBLE
540 ;;; output in the not-inlined case and see whether there's a problem,
541 ;;; and maybe even find a fix..
542 (declaim (inline %extract-stat-results))
543 (defun %extract-stat-results (wrapped-stat)
544 (declare (type (alien (* (struct wrapped_stat))) wrapped-stat))
546 (slot wrapped-stat 'st-dev)
547 (slot wrapped-stat 'st-ino)
548 (slot wrapped-stat 'st-mode)
549 (slot wrapped-stat 'st-nlink)
550 (slot wrapped-stat 'st-uid)
551 (slot wrapped-stat 'st-gid)
552 (slot wrapped-stat 'st-rdev)
553 (slot wrapped-stat 'st-size)
554 (slot wrapped-stat 'st-atime)
555 (slot wrapped-stat 'st-mtime)
556 (slot wrapped-stat 'st-ctime)
557 (slot wrapped-stat 'st-blksize)
558 (slot wrapped-stat 'st-blocks)))
560 ;;; Unix system calls in the stat(2) family are handled by calls to
561 ;;; C-level wrapper functions which copy all the raw "struct stat"
562 ;;; slots into the system-independent wrapped_stat format.
563 ;;; stat(2) <-> stat_wrapper()
564 ;;; fstat(2) <-> fstat_wrapper()
565 ;;; lstat(2) <-> lstat_wrapper()
566 (defun unix-stat (name)
567 (declare (type unix-pathname name))
568 (with-alien ((buf (struct wrapped_stat)))
569 (syscall ("stat_wrapper" c-string (* (struct wrapped_stat)))
570 (%extract-stat-results (addr buf))
572 (defun unix-lstat (name)
573 (declare (type unix-pathname name))
574 (with-alien ((buf (struct wrapped_stat)))
575 (syscall ("lstat_wrapper" c-string (* (struct wrapped_stat)))
576 (%extract-stat-results (addr buf))
578 (defun unix-fstat (fd)
579 (declare (type unix-fd fd))
580 (with-alien ((buf (struct wrapped_stat)))
581 (syscall ("fstat_wrapper" int (* (struct wrapped_stat)))
582 (%extract-stat-results (addr buf))
587 ;; the POSIX.4 structure for a time value. This is like a "struct
588 ;; timeval" but has nanoseconds instead of microseconds.
591 (tv-sec long) ; seconds
592 (tv-nsec long))) ; nanoseconds
594 ;; used by other time functions
597 (tm-sec int) ; Seconds. [0-60] (1 leap second)
598 (tm-min int) ; Minutes. [0-59]
599 (tm-hour int) ; Hours. [0-23]
600 (tm-mday int) ; Day. [1-31]
601 (tm-mon int) ; Month. [0-11]
602 (tm-year int) ; Year - 1900.
603 (tm-wday int) ; Day of week. [0-6]
604 (tm-yday int) ; Days in year. [0-365]
605 (tm-isdst int) ; DST. [-1/0/1]
606 (tm-gmtoff long) ; Seconds east of UTC.
607 (tm-zone c-string))) ; Timezone abbreviation.
609 (def-alien-routine get-timezone sb!c-call:void
610 (when sb!c-call:long :in)
611 (minutes-west sb!c-call:int :out)
612 (daylight-savings-p sb!alien:boolean :out))
614 (defun unix-get-minutes-west (secs)
615 (multiple-value-bind (ignore minutes dst) (get-timezone secs)
616 (declare (ignore ignore) (ignore dst))
619 (defun unix-get-timezone (secs)
620 (multiple-value-bind (ignore minutes dst) (get-timezone secs)
621 (declare (ignore ignore) (ignore minutes))
622 (values (deref unix-tzname (if dst 1 0)))))
627 ;;; Structure crudely representing a timezone. KLUDGE: This is
628 ;;; obsolete and should never be used.
631 (tz-minuteswest int) ; minutes west of Greenwich
632 (tz-dsttime int))) ; type of dst correction
634 ;;; If it works, UNIX-GETTIMEOFDAY returns 5 values: T, the seconds
635 ;;; and microseconds of the current time of day, the timezone (in
636 ;;; minutes west of Greenwich), and a daylight-savings flag. If it
637 ;;; doesn't work, it returns NIL and the errno.
638 #!-sb-fluid (declaim (inline unix-gettimeofday))
639 (defun unix-gettimeofday ()
640 (with-alien ((tv (struct timeval))
641 (tz (struct timezone)))
642 (syscall* ("gettimeofday" (* (struct timeval))
643 (* (struct timezone)))
647 (slot tz 'tz-minuteswest)
648 (slot tz 'tz-dsttime))
653 (defconstant ENOENT 2) ; Unix error code, "No such file or directory"
654 (defconstant EINTR 4) ; Unix error code, "Interrupted system call"
655 (defconstant EIO 5) ; Unix error code, "I/O error"
656 (defconstant EEXIST 17) ; Unix error code, "File exists"
657 (defconstant ESPIPE 29) ; Unix error code, "Illegal seek"
658 (defconstant EWOULDBLOCK 11) ; Unix error code, "Operation would block"
659 ;;; FIXME: Many Unix error code definitions were deleted from the old
660 ;;; CMU CL source code here, but not in the exports of SB-UNIX. I
661 ;;; (WHN) hope that someday I'll figure out an automatic way to detect
662 ;;; unused symbols in package exports, but if I don't, there are
663 ;;; enough of them all in one place here that they should probably be
667 ;;;; support routines for dealing with Unix pathnames
669 (defun unix-file-kind (name &optional check-for-links)
671 "Return either :FILE, :DIRECTORY, :LINK, :SPECIAL, or NIL."
672 (declare (simple-string name))
673 (multiple-value-bind (res dev ino mode)
674 (if check-for-links (unix-lstat name) (unix-stat name))
675 (declare (type (or fixnum null) mode)
678 (let ((kind (logand mode s-ifmt)))
679 (cond ((eql kind s-ifdir) :directory)
680 ((eql kind s-ifreg) :file)
681 ((eql kind s-iflnk) :link)
684 (defun unix-maybe-prepend-current-directory (name)
685 (declare (simple-string name))
686 (if (and (> (length name) 0) (char= (schar name 0) #\/))
688 (multiple-value-bind (win dir) (unix-current-directory)
690 (concatenate 'simple-string dir "/" name)
693 ;;; Return the pathname with all symbolic links resolved.
695 ;;; FIXME: Could we just use Unix readlink(2) instead?
696 (defun unix-resolve-links (pathname)
697 (declare (simple-string pathname))
698 (let ((len (length pathname))
700 (declare (fixnum len) (simple-string pending))
703 (let ((result (make-string 1024 :initial-element (code-char 0)))
707 (let* ((name-end (or (position #\/ pending :start name-start) len))
708 (new-fill-ptr (+ fill-ptr (- name-end name-start))))
709 (replace result pending
714 (let ((kind (unix-file-kind (if (zerop name-end) "/" result) t)))
715 (unless kind (return nil))
716 (cond ((eq kind :link)
717 (multiple-value-bind (link err) (unix-readlink result)
719 (error 'simple-file-error
722 "~@<error reading link ~S: ~2I~_~A~:>"
723 :format-arguments (list (subseq
726 (cond ((or (zerop (length link))
727 (char/= (schar link 0) #\/))
728 ;; It's a relative link.
729 (fill result (code-char 0)
732 ((string= result "/../" :end1 4)
733 ;; It's across the super-root.
734 (let ((slash (or (position #\/ result :start 4)
736 (fill result (code-char 0)
739 (setf fill-ptr slash)))
742 (and (> (length link) 0)
743 (char= (schar link 0) #\/))
744 (fill result (code-char 0) :end new-fill-ptr)
749 (concatenate 'simple-string
751 (subseq pending name-end))))
752 (setf len (length pending))
753 (setf name-start 0)))
755 (return (subseq result 0 new-fill-ptr)))
756 ((eq kind :directory)
757 (setf (schar result new-fill-ptr) #\/)
758 (setf fill-ptr (1+ new-fill-ptr))
759 (setf name-start (1+ name-end)))
761 (return nil))))))))))
763 (defun unix-simplify-pathname (src)
764 (declare (simple-string src))
765 (let* ((src-len (length src))
766 (dst (make-string src-len))
770 (macrolet ((deposit (char)
772 (setf (schar dst dst-len) ,char)
774 (dotimes (src-index src-len)
775 (let ((char (schar src src-index)))
776 (cond ((char= char #\.)
783 ;; Either ``/...' or ``...//...'
785 (setf last-slash dst-len)
788 ;; Either ``./...'' or ``..././...''
793 ((and last-slash (not (zerop last-slash)))
794 ;; There is something before this ..
795 (let ((prev-prev-slash
796 (position #\/ dst :end last-slash :from-end t)))
797 (cond ((and (= (+ (or prev-prev-slash 0) 2)
799 (char= (schar dst (- last-slash 2)) #\.)
800 (char= (schar dst (1- last-slash)) #\.))
801 ;; The something before this .. is another ..
803 (setf last-slash dst-len))
805 ;; The something is some directory or other.
810 (setf last-slash prev-prev-slash)))))
812 ;; There is nothing before this .., so we need to keep it
813 (setf last-slash dst-len)
816 ;; Something other than a dot between slashes.
817 (setf last-slash dst-len)
822 (setf (schar dst dst-len) char)
824 (when (and last-slash (not (zerop last-slash)))
827 ;; We've got ``foobar/.''
830 ;; We've got ``foobar/..''
831 (unless (and (>= last-slash 2)
832 (char= (schar dst (1- last-slash)) #\.)
833 (char= (schar dst (- last-slash 2)) #\.)
835 (char= (schar dst (- last-slash 3)) #\/)))
836 (let ((prev-prev-slash
837 (position #\/ dst :end last-slash :from-end t)))
839 (setf dst-len (1+ prev-prev-slash))
840 (return-from unix-simplify-pathname "./")))))))
841 (cond ((zerop dst-len)
846 (subseq dst 0 dst-len)))))
848 ;;;; stuff not yet found in the header files
850 ;;;; Abandon all hope who enters here...
852 ;;; not checked for linux...
853 (defmacro fd-set (offset fd-set)
854 (let ((word (gensym))
856 `(multiple-value-bind (,word ,bit) (floor ,offset 32)
857 (setf (deref (slot ,fd-set 'fds-bits) ,word)
858 (logior (truly-the (unsigned-byte 32) (ash 1 ,bit))
859 (deref (slot ,fd-set 'fds-bits) ,word))))))
861 ;;; not checked for linux...
862 (defmacro fd-clr (offset fd-set)
863 (let ((word (gensym))
865 `(multiple-value-bind (,word ,bit) (floor ,offset 32)
866 (setf (deref (slot ,fd-set 'fds-bits) ,word)
867 (logand (deref (slot ,fd-set 'fds-bits) ,word)
868 (sb!kernel:32bit-logical-not
869 (truly-the (unsigned-byte 32) (ash 1 ,bit))))))))
871 ;;; not checked for linux...
872 (defmacro fd-isset (offset fd-set)
873 (let ((word (gensym))
875 `(multiple-value-bind (,word ,bit) (floor ,offset 32)
876 (logbitp ,bit (deref (slot ,fd-set 'fds-bits) ,word)))))
878 ;;; not checked for linux...
879 (defmacro fd-zero (fd-set)
881 ,@(loop for index upfrom 0 below (/ fd-setsize 32)
882 collect `(setf (deref (slot ,fd-set 'fds-bits) ,index) 0))))