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
198 ;;;; runtime/stat-wrapper.h
200 ;;; this looks like "struct stat" according to stat(2). It may not
201 ;;; correspond to the real in-memory stat structure that the syscall
202 ;;; uses, and if it doesn't, shouldn't. Linux in particular is packed
203 ;;; full of stat macros, so we do this stuff in runtime/stat-wrapper.c
205 ;;; Note that st-dev is a long, not a dev-t. This is because dev-t on
206 ;;; linux 32 bit archs is a 64 bit quantity, but alien doesn's support
207 ;;; those. We don't actually access that field anywhere, though, so until
208 ;;; we can get 64 bit alien support it'll do
212 (st-dev unsigned-long) ;would be dev-t in a real stat
218 (st-rdev unsigned-long) ;ditto
220 (st-blksize unsigned-long)
221 (st-blocks unsigned-long)
228 ;;; Given a file path (a string) and one of four constant modes,
229 ;;; return T if the file is accessible with that mode and NIL if not.
230 ;;; When NIL, also return an errno value with NIL which tells why the
231 ;;; file was not accessible.
233 ;;; The access modes are:
234 ;;; r_ok Read permission.
235 ;;; w_ok Write permission.
236 ;;; x_ok Execute permission.
237 ;;; f_ok Presence of file.
238 (defun unix-access (path mode)
239 (declare (type unix-pathname path)
241 (void-syscall ("access" c-string int) path mode))
243 ;;; values for the second argument to UNIX-LSEEK
244 (defconstant l_set 0) ; to set the file pointer
245 (defconstant l_incr 1) ; to increment the file pointer
246 (defconstant l_xtnd 2) ; to extend the file size
248 ;;; Accept a file descriptor and move the file pointer ahead
249 ;;; a certain offset for that file. WHENCE can be any of the following:
250 ;;; L_SET Set the file pointer.
251 ;;; L_INCR Increment the file pointer.
252 ;;; L_XTND Extend the file size.
253 (defun unix-lseek (fd offset whence)
254 (declare (type unix-fd fd)
255 (type (unsigned-byte 32) offset)
256 (type (integer 0 2) whence))
258 (int-syscall ("lseek" int off-t int) fd offset whence)
259 ;; Need a 64-bit return value type for this. TBD. For now,
260 ;; don't use this with any 2G+ partitions.
262 (int-syscall ("lseek" int unsigned-long unsigned-long int)
265 ;;; UNIX-READ accepts a file descriptor, a buffer, and the length to read.
266 ;;; It attempts to read len bytes from the device associated with fd
267 ;;; and store them into the buffer. It returns the actual number of
269 (defun unix-read (fd buf len)
270 (declare (type unix-fd fd)
271 (type (unsigned-byte 32) len))
273 (int-syscall ("read" int (* char) int) fd buf len))
275 ;;; UNIX-WRITE accepts a file descriptor, a buffer, an offset, and the
276 ;;; length to write. It attempts to write len bytes to the device
277 ;;; associated with fd from the the buffer starting at offset. It returns
278 ;;; the actual number of bytes written.
279 (defun unix-write (fd buf offset len)
280 (declare (type unix-fd fd)
281 (type (unsigned-byte 32) offset len))
282 (int-syscall ("write" int (* char) int)
284 (with-alien ((ptr (* char) (etypecase buf
285 ((simple-array * (*))
289 (addr (deref ptr offset)))
292 ;;; Set up a unix-piping mechanism consisting of an input pipe and an
293 ;;; output pipe. Return two values: if no error occurred the first
294 ;;; value is the pipe to be read from and the second is can be written
295 ;;; to. If an error occurred the first value is NIL and the second the
298 (with-alien ((fds (array int 2)))
299 (syscall ("pipe" (* int))
300 (values (deref fds 0) (deref fds 1))
301 (cast fds (* int)))))
303 ;;; UNIX-CHDIR accepts a directory name and makes that the
304 ;;; current working directory.
305 (defun unix-chdir (path)
306 (declare (type unix-pathname path))
307 (void-syscall ("chdir" c-string) path))
309 ;;; Return the current directory as a SIMPLE-STRING.
310 (defun unix-current-directory ()
311 ;; FIXME: Gcc justifiably complains that getwd is dangerous and should
312 ;; not be used; especially with a hardwired 1024 buffer size, yecch.
313 ;; This should be rewritten to use getcwd(3), perhaps by writing
314 ;; a C service routine to do the actual call to getcwd(3) and check
316 (with-alien ((buf (array char 1024)))
317 (values (not (zerop (alien-funcall (extern-alien "getwd"
318 (function int (* char)))
319 (cast buf (* char)))))
320 (cast buf c-string))))
322 ;;; Duplicate an existing file descriptor (given as the argument) and
323 ;;; return it. If FD is not a valid file descriptor, NIL and an error
324 ;;; number are returned.
326 (declare (type unix-fd fd))
327 (int-syscall ("dup" int) fd))
329 ;;; Terminate the current process with an optional error code. If
330 ;;; successful, the call doesn't return. If unsuccessful, the call
331 ;;; returns NIL and an error number.
332 (defun unix-exit (&optional (code 0))
333 (declare (type (signed-byte 32) code))
334 (void-syscall ("exit" int) code))
336 ;;; Return the process id of the current process.
337 (def-alien-routine ("getpid" unix-getpid) int)
339 ;;; Return the real user-id associated with the current process.
340 (def-alien-routine ("getuid" unix-getuid) int)
342 ;;; Invoke readlink(2) on the file name specified by the simple string
343 ;;; PATH. Return up to two values: the contents of the symbolic link
344 ;;; if the call is successful, or NIL and the Unix error number.
345 (defun unix-readlink (path)
346 (declare (type unix-pathname path))
347 (with-alien ((buf (array char 1024)))
348 (syscall ("readlink" c-string (* char) int)
349 (let ((string (make-string result)))
350 (sb!kernel:copy-from-system-area
352 string (* sb!vm:vector-data-offset sb!vm:word-bits)
353 (* result sb!vm:byte-bits))
355 path (cast buf (* char)) 1024)))
357 ;;; UNIX-UNLINK accepts a name and deletes the directory entry for that
358 ;;; name and the file if this is the last link.
359 (defun unix-unlink (name)
360 (declare (type unix-pathname name))
361 (void-syscall ("unlink" c-string) name))
363 ;;; Set the tty-process-group for the unix file-descriptor FD to PGRP.
364 ;;; If not supplied, FD defaults to "/dev/tty".
365 (defun %set-tty-process-group (pgrp &optional fd)
366 (let ((old-sigs (unix-sigblock (sigmask :sigttou
370 (declare (type (unsigned-byte 32) old-sigs))
374 (multiple-value-bind (tty-fd errno) (unix-open "/dev/tty" o_rdwr 0)
376 (multiple-value-prog1
377 (tcsetpgrp tty-fd pgrp)
378 (unix-close tty-fd)))
380 (values nil errno)))))
381 (unix-sigsetmask old-sigs))))
383 ;;; Return the name of the host machine as a string.
384 (defun unix-gethostname ()
385 (with-alien ((buf (array char 256)))
386 (syscall ("gethostname" (* char) int)
388 (cast buf (* char)) 256)))
390 ;;; Write the core image of the file described by FD to disk.
391 (defun unix-fsync (fd)
392 (declare (type unix-fd fd))
393 (void-syscall ("fsync" int) fd))
397 ;;; UNIX-IOCTL performs a variety of operations on open i/o
398 ;;; descriptors. See the UNIX Programmer's Manual for more
400 (defun unix-ioctl (fd cmd arg)
401 (declare (type unix-fd fd)
402 (type (unsigned-byte 32) cmd))
403 (void-syscall ("ioctl" int unsigned-int (* char)) fd cmd arg))
407 ;;; FIXME: All we seem to need is the RUSAGE_SELF version of this.
409 ;;; Like getrusage(2), but return only the system and user time,
410 ;;; and return the seconds and microseconds as separate values.
411 #!-sb-fluid (declaim (inline unix-fast-getrusage))
412 (defun unix-fast-getrusage (who)
413 (declare (values (member t)
414 (unsigned-byte 31) (mod 1000000)
415 (unsigned-byte 31) (mod 1000000)))
416 (with-alien ((usage (struct rusage)))
417 (syscall* ("getrusage" int (* (struct rusage)))
419 (slot (slot usage 'ru-utime) 'tv-sec)
420 (slot (slot usage 'ru-utime) 'tv-usec)
421 (slot (slot usage 'ru-stime) 'tv-sec)
422 (slot (slot usage 'ru-stime) 'tv-usec))
425 ;;; Return information about the resource usage of the process
426 ;;; specified by WHO. WHO can be either the current process
427 ;;; (rusage_self) or all of the terminated child processes
428 ;;; (rusage_children). NIL and an error number is returned if the call
430 (defun unix-getrusage (who)
431 (with-alien ((usage (struct rusage)))
432 (syscall ("getrusage" int (* (struct rusage)))
434 (+ (* (slot (slot usage 'ru-utime) 'tv-sec) 1000000)
435 (slot (slot usage 'ru-utime) 'tv-usec))
436 (+ (* (slot (slot usage 'ru-stime) 'tv-sec) 1000000)
437 (slot (slot usage 'ru-stime) 'tv-usec))
438 (slot usage 'ru-maxrss)
439 (slot usage 'ru-ixrss)
440 (slot usage 'ru-idrss)
441 (slot usage 'ru-isrss)
442 (slot usage 'ru-minflt)
443 (slot usage 'ru-majflt)
444 (slot usage 'ru-nswap)
445 (slot usage 'ru-inblock)
446 (slot usage 'ru-oublock)
447 (slot usage 'ru-msgsnd)
448 (slot usage 'ru-msgrcv)
449 (slot usage 'ru-nsignals)
450 (slot usage 'ru-nvcsw)
451 (slot usage 'ru-nivcsw))
456 (defmacro unix-fast-select (num-descriptors
457 read-fds write-fds exception-fds
458 timeout-secs &optional (timeout-usecs 0))
460 "Perform the UNIX select(2) system call."
461 (declare (type (integer 0 #.FD-SETSIZE) num-descriptors)
462 (type (or (alien (* (struct fd-set))) null)
463 read-fds write-fds exception-fds)
464 (type (or null (unsigned-byte 31)) timeout-secs)
465 (type (unsigned-byte 31) timeout-usecs) )
467 ;; (optimize (speed 3) (safety 0) (inhibit-warnings 3))
468 ;; in the declarations above. If they're important, they should
469 ;; be in a declaration inside the LET expansion, not in the
470 ;; macro compile-time code.
471 `(let ((timeout-secs ,timeout-secs))
472 (with-alien ((tv (struct timeval)))
474 (setf (slot tv 'tv-sec) timeout-secs)
475 (setf (slot tv 'tv-usec) ,timeout-usecs))
476 (int-syscall ("select" int (* (struct fd-set)) (* (struct fd-set))
477 (* (struct fd-set)) (* (struct timeval)))
478 ,num-descriptors ,read-fds ,write-fds ,exception-fds
479 (if timeout-secs (alien-sap (addr tv)) (int-sap 0))))))
481 ;;; UNIX-SELECT accepts sets of file descriptors and waits for an event
482 ;;; to happen on one of them or to time out.
483 (defmacro num-to-fd-set (fdset num)
486 (setf (deref (slot ,fdset 'fds-bits) 0) ,num)
487 ,@(loop for index upfrom 1 below (/ fd-setsize 32)
488 collect `(setf (deref (slot ,fdset 'fds-bits) ,index) 0)))
490 ,@(loop for index upfrom 0 below (/ fd-setsize 32)
491 collect `(setf (deref (slot ,fdset 'fds-bits) ,index)
492 (ldb (byte 32 ,(* index 32)) ,num))))))
494 (defmacro fd-set-to-num (nfds fdset)
496 (deref (slot ,fdset 'fds-bits) 0)
497 (+ ,@(loop for index upfrom 0 below (/ fd-setsize 32)
498 collect `(ash (deref (slot ,fdset 'fds-bits) ,index)
501 ;;; Examine the sets of descriptors passed as arguments to see whether
502 ;;; they are ready for reading and writing. See the UNIX Programmer's
503 ;;; Manual for more information.
504 (defun unix-select (nfds rdfds wrfds xpfds to-secs &optional (to-usecs 0))
505 (declare (type (integer 0 #.FD-SETSIZE) nfds)
506 (type unsigned-byte rdfds wrfds xpfds)
507 (type (or (unsigned-byte 31) null) to-secs)
508 (type (unsigned-byte 31) to-usecs)
509 (optimize (speed 3) (safety 0) (inhibit-warnings 3)))
510 (with-alien ((tv (struct timeval))
511 (rdf (struct fd-set))
512 (wrf (struct fd-set))
513 (xpf (struct fd-set)))
515 (setf (slot tv 'tv-sec) to-secs)
516 (setf (slot tv 'tv-usec) to-usecs))
517 (num-to-fd-set rdf rdfds)
518 (num-to-fd-set wrf wrfds)
519 (num-to-fd-set xpf xpfds)
520 (macrolet ((frob (lispvar alienvar)
521 `(if (zerop ,lispvar)
523 (alien-sap (addr ,alienvar)))))
524 (syscall ("select" int (* (struct fd-set)) (* (struct fd-set))
525 (* (struct fd-set)) (* (struct timeval)))
527 (fd-set-to-num nfds rdf)
528 (fd-set-to-num nfds wrf)
529 (fd-set-to-num nfds xpf))
530 nfds (frob rdfds rdf) (frob wrfds wrf) (frob xpfds xpf)
531 (if to-secs (alien-sap (addr tv)) (int-sap 0))))))
535 ;;; FIXME: This is only used in this file, and needn't be in target Lisp
536 ;;; runtime. It's also unclear why it needs to be a macro instead of a
537 ;;; function. Perhaps it should become a FLET.
538 (defmacro extract-stat-results (buf)
543 (slot ,buf 'st-nlink)
548 (slot ,buf 'st-atime)
549 (slot ,buf 'st-mtime)
550 (slot ,buf 'st-ctime)
551 (slot ,buf 'st-blksize)
552 (slot ,buf 'st-blocks)))
554 ;;; Retrieve information about the specified file returning them in
555 ;;; the form of multiple values. See the UNIX Programmer's Manual for
556 ;;; a description of the values returned. If the call fails, then NIL
557 ;;; and an error number is returned instead.
559 (defun unix-stat (name)
560 (declare (type unix-pathname name))
561 (when (string= name "")
563 (with-alien ((buf (struct stat)))
564 (syscall ("stat_wrapper" c-string (* (struct stat)))
565 (extract-stat-results buf)
568 (defun unix-lstat (name)
570 "Unix-lstat is identical to unix-stat, except if NAME is
571 a symlink, in which case it returns information about the
572 link itself rather than dereferencing it."
573 (declare (type unix-pathname name))
574 (with-alien ((buf (struct stat)))
575 (syscall ("lstat_wrapper" c-string (* (struct stat)))
576 (extract-stat-results buf)
579 ;;; like UNIX-STAT except the file is specified by the file descriptor FD
580 (defun unix-fstat (fd)
581 (declare (type unix-fd fd))
582 (with-alien ((buf (struct stat)))
583 (syscall ("fstat_wrapper" int (* (struct stat)))
584 (extract-stat-results buf)
588 ;;; UNIX-MKDIR accepts a name and a mode and attempts to create the
589 ;;; corresponding directory with mode mode.
590 (defun unix-mkdir (name mode)
591 (declare (type unix-pathname name)
592 (type unix-file-mode mode))
593 (void-syscall ("mkdir" c-string int) name mode))
597 ;; the POSIX.4 structure for a time value. This is like a `struct
598 ;; timeval' but has nanoseconds instead of microseconds.
601 (tv-sec long) ;Seconds
602 (tv-nsec long))) ;Nanoseconds
604 ;; used by other time functions
607 (tm-sec int) ; Seconds. [0-60] (1 leap second)
608 (tm-min int) ; Minutes. [0-59]
609 (tm-hour int) ; Hours. [0-23]
610 (tm-mday int) ; Day. [1-31]
611 (tm-mon int) ; Month. [0-11]
612 (tm-year int) ; Year - 1900.
613 (tm-wday int) ; Day of week. [0-6]
614 (tm-yday int) ; Days in year.[0-365]
615 (tm-isdst int) ; DST. [-1/0/1]
616 (tm-gmtoff long) ; Seconds east of UTC.
617 (tm-zone c-string))) ; Timezone abbreviation.
619 (def-alien-routine get-timezone sb!c-call:void
620 (when sb!c-call:long :in)
621 (minutes-west sb!c-call:int :out)
622 (daylight-savings-p sb!alien:boolean :out))
624 (defun unix-get-minutes-west (secs)
625 (multiple-value-bind (ignore minutes dst) (get-timezone secs)
626 (declare (ignore ignore) (ignore dst))
629 (defun unix-get-timezone (secs)
630 (multiple-value-bind (ignore minutes dst) (get-timezone secs)
631 (declare (ignore ignore) (ignore minutes))
632 (values (deref unix-tzname (if dst 1 0)))))
637 ;;; Structure crudely representing a timezone. KLUDGE: This is
638 ;;; obsolete and should never be used.
641 (tz-minuteswest int) ; minutes west of Greenwich
642 (tz-dsttime int))) ; type of dst correction
644 ;;; If it works, UNIX-GETTIMEOFDAY returns 5 values: T, the seconds
645 ;;; and microseconds of the current time of day, the timezone (in
646 ;;; minutes west of Greenwich), and a daylight-savings flag. If it
647 ;;; doesn't work, it returns NIL and the errno.
648 #!-sb-fluid (declaim (inline unix-gettimeofday))
649 (defun unix-gettimeofday ()
650 (with-alien ((tv (struct timeval))
651 (tz (struct timezone)))
652 (syscall* ("gettimeofday" (* (struct timeval))
653 (* (struct timezone)))
657 (slot tz 'tz-minuteswest)
658 (slot tz 'tz-dsttime))
663 (defconstant ENOENT 2) ; Unix error code, "No such file or directory"
664 (defconstant EINTR 4) ; Unix error code, "Interrupted system call"
665 (defconstant EIO 5) ; Unix error code, "I/O error"
666 (defconstant EEXIST 17) ; Unix error code, "File exists"
667 (defconstant ESPIPE 29) ; Unix error code, "Illegal seek"
668 (defconstant EWOULDBLOCK 11) ; Unix error code, "Operation would block"
669 ;;; FIXME: Many Unix error code definitions were deleted from the old
670 ;;; CMU CL source code here, but not in the exports of SB-UNIX. I
671 ;;; (WHN) hope that someday I'll figure out an automatic way to detect
672 ;;; unused symbols in package exports, but if I don't, there are
673 ;;; enough of them all in one place here that they should probably be
677 ;;;; support routines for dealing with Unix pathnames
679 (defun unix-file-kind (name &optional check-for-links)
681 "Return either :FILE, :DIRECTORY, :LINK, :SPECIAL, or NIL."
682 (declare (simple-string name))
683 (multiple-value-bind (res dev ino mode)
684 (if check-for-links (unix-lstat name) (unix-stat name))
685 (declare (type (or fixnum null) mode)
688 (let ((kind (logand mode s-ifmt)))
689 (cond ((eql kind s-ifdir) :directory)
690 ((eql kind s-ifreg) :file)
691 ((eql kind s-iflnk) :link)
694 (defun unix-maybe-prepend-current-directory (name)
695 (declare (simple-string name))
696 (if (and (> (length name) 0) (char= (schar name 0) #\/))
698 (multiple-value-bind (win dir) (unix-current-directory)
700 (concatenate 'simple-string dir "/" name)
703 ;;; Return the pathname with all symbolic links resolved.
705 ;;; FIXME: Could we just use Unix readlink(2) instead?
706 (defun unix-resolve-links (pathname)
707 (declare (simple-string pathname))
708 (let ((len (length pathname))
710 (declare (fixnum len) (simple-string pending))
713 (let ((result (make-string 1024 :initial-element (code-char 0)))
717 (let* ((name-end (or (position #\/ pending :start name-start) len))
718 (new-fill-ptr (+ fill-ptr (- name-end name-start))))
719 (replace result pending
724 (let ((kind (unix-file-kind (if (zerop name-end) "/" result) t)))
725 (unless kind (return nil))
726 (cond ((eq kind :link)
727 (multiple-value-bind (link err) (unix-readlink result)
729 (error 'simple-file-error
732 "~@<error reading link ~S: ~2I~_~A~:>"
733 :format-arguments (list (subseq
736 (cond ((or (zerop (length link))
737 (char/= (schar link 0) #\/))
738 ;; It's a relative link.
739 (fill result (code-char 0)
742 ((string= result "/../" :end1 4)
743 ;; It's across the super-root.
744 (let ((slash (or (position #\/ result :start 4)
746 (fill result (code-char 0)
749 (setf fill-ptr slash)))
752 (and (> (length link) 0)
753 (char= (schar link 0) #\/))
754 (fill result (code-char 0) :end new-fill-ptr)
759 (concatenate 'simple-string
761 (subseq pending name-end))))
762 (setf len (length pending))
763 (setf name-start 0)))
765 (return (subseq result 0 new-fill-ptr)))
766 ((eq kind :directory)
767 (setf (schar result new-fill-ptr) #\/)
768 (setf fill-ptr (1+ new-fill-ptr))
769 (setf name-start (1+ name-end)))
771 (return nil))))))))))
773 (defun unix-simplify-pathname (src)
774 (declare (simple-string src))
775 (let* ((src-len (length src))
776 (dst (make-string src-len))
780 (macrolet ((deposit (char)
782 (setf (schar dst dst-len) ,char)
784 (dotimes (src-index src-len)
785 (let ((char (schar src src-index)))
786 (cond ((char= char #\.)
793 ;; Either ``/...' or ``...//...'
795 (setf last-slash dst-len)
798 ;; Either ``./...'' or ``..././...''
803 ((and last-slash (not (zerop last-slash)))
804 ;; There is something before this ..
805 (let ((prev-prev-slash
806 (position #\/ dst :end last-slash :from-end t)))
807 (cond ((and (= (+ (or prev-prev-slash 0) 2)
809 (char= (schar dst (- last-slash 2)) #\.)
810 (char= (schar dst (1- last-slash)) #\.))
811 ;; The something before this .. is another ..
813 (setf last-slash dst-len))
815 ;; The something is some directory or other.
820 (setf last-slash prev-prev-slash)))))
822 ;; There is nothing before this .., so we need to keep it
823 (setf last-slash dst-len)
826 ;; Something other than a dot between slashes.
827 (setf last-slash dst-len)
832 (setf (schar dst dst-len) char)
834 (when (and last-slash (not (zerop last-slash)))
837 ;; We've got ``foobar/.''
840 ;; We've got ``foobar/..''
841 (unless (and (>= last-slash 2)
842 (char= (schar dst (1- last-slash)) #\.)
843 (char= (schar dst (- last-slash 2)) #\.)
845 (char= (schar dst (- last-slash 3)) #\/)))
846 (let ((prev-prev-slash
847 (position #\/ dst :end last-slash :from-end t)))
849 (setf dst-len (1+ prev-prev-slash))
850 (return-from unix-simplify-pathname "./")))))))
851 (cond ((zerop dst-len)
856 (subseq dst 0 dst-len)))))
858 ;;;; stuff not yet found in the header files
860 ;;;; Abandon all hope who enters here...
862 ;;; not checked for linux...
863 (defmacro fd-set (offset fd-set)
864 (let ((word (gensym))
866 `(multiple-value-bind (,word ,bit) (floor ,offset 32)
867 (setf (deref (slot ,fd-set 'fds-bits) ,word)
868 (logior (truly-the (unsigned-byte 32) (ash 1 ,bit))
869 (deref (slot ,fd-set 'fds-bits) ,word))))))
871 ;;; not checked for linux...
872 (defmacro fd-clr (offset fd-set)
873 (let ((word (gensym))
875 `(multiple-value-bind (,word ,bit) (floor ,offset 32)
876 (setf (deref (slot ,fd-set 'fds-bits) ,word)
877 (logand (deref (slot ,fd-set 'fds-bits) ,word)
878 (sb!kernel:32bit-logical-not
879 (truly-the (unsigned-byte 32) (ash 1 ,bit))))))))
881 ;;; not checked for linux...
882 (defmacro fd-isset (offset fd-set)
883 (let ((word (gensym))
885 `(multiple-value-bind (,word ,bit) (floor ,offset 32)
886 (logbitp ,bit (deref (slot ,fd-set 'fds-bits) ,word)))))
888 ;;; not checked for linux...
889 (defmacro fd-zero (fd-set)
891 ,@(loop for index upfrom 0 below (/ fd-setsize 32)
892 collect `(setf (deref (slot ,fd-set 'fds-bits) ,index) 0))))