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)
68 (declare (optimize (sb!c::float-accuracy 0)))
69 (let ((result (alien-funcall (extern-alien ,name (function int ,@arg-types))
72 (values nil (get-errno))
75 ;;; This is like SYSCALL, but if it fails, signal an error instead of
76 ;;; returning error codes. Should only be used for syscalls that will
77 ;;; never really get an error.
78 (defmacro syscall* ((name &rest arg-types) success-form &rest args)
80 (declare (optimize (sb!c::float-accuracy 0)))
81 (let ((result (alien-funcall (extern-alien ,name (function int ,@arg-types))
84 (error "Syscall ~A failed: ~A" ,name (strerror))
87 (/show0 "unix.lisp 109")
89 (defmacro void-syscall ((name &rest arg-types) &rest args)
90 `(syscall (,name ,@arg-types) (values t 0) ,@args))
92 (defmacro int-syscall ((name &rest arg-types) &rest args)
93 `(syscall (,name ,@arg-types) (values result 0) ,@args))
95 (defmacro with-restarted-syscall ((&optional (value (gensym))
97 syscall-form &rest body)
99 "Evaluate BODY with VALUE and ERRNO bound to the return values of
100 SYSCALL-FORM. Repeat evaluation of SYSCALL-FORM if it is interrupted."
101 `(let (,value ,errno)
102 (loop (multiple-value-setq (,value ,errno)
104 (unless #!-win32 (eql ,errno sb!unix:eintr) #!+win32 nil
105 (return (values ,value ,errno))))
110 (defconstant espipe 29)
111 ;; For stat-wrapper hack (different-type or non-existing win32 fields).
112 (define-alien-type nlink-t short)
113 (define-alien-type uid-t short)
114 (define-alien-type gid-t short))
116 ;;;; hacking the Unix environment
119 (define-alien-routine ("getenv" posix-getenv) c-string
120 "Return the \"value\" part of the environment string \"name=value\" which
121 corresponds to NAME, or NIL if there is none."
126 ;;; Rename the file with string NAME1 to the string NAME2. NIL and an
127 ;;; error code is returned if an error occurs.
129 (defun unix-rename (name1 name2)
130 (declare (type unix-pathname name1 name2))
131 (void-syscall ("rename" c-string c-string) name1 name2))
133 ;;; from sys/types.h and gnu/types.h
135 (/show0 "unix.lisp 220")
137 ;;; FIXME: We shouldn't hand-copy types from header files into Lisp
138 ;;; like this unless we have extreme provocation. Reading directories
139 ;;; is not extreme enough, since it doesn't need to be blindingly
140 ;;; fast: we can just implement those functions in C as a wrapper
142 (define-alien-type fd-mask unsigned-long)
144 (eval-when (:compile-toplevel :load-toplevel :execute)
145 (defconstant fd-setsize 1024))
147 (define-alien-type nil
149 (fds-bits (array fd-mask #.(/ fd-setsize
150 sb!vm:n-machine-word-bits)))))
152 (/show0 "unix.lisp 304")
157 ;;;; POSIX Standard: 6.5 File Control Operations <fcntl.h>
159 ;;; Open the file whose pathname is specified by PATH for reading
160 ;;; and/or writing as specified by the FLAGS argument. Various FLAGS
161 ;;; masks (O_RDONLY etc.) are defined in fcntlbits.h.
163 ;;; If the O_CREAT flag is specified, then the file is created with a
164 ;;; permission of argument MODE if the file doesn't exist. An integer
165 ;;; file descriptor is returned by UNIX-OPEN.
166 (defun unix-open (path flags mode)
167 (declare (type unix-pathname path)
169 (type unix-file-mode mode))
170 (int-syscall ("open" c-string int int)
172 (logior #!+win32 o_binary
173 #!+largefile o_largefile
177 ;;; UNIX-CLOSE accepts a file descriptor and attempts to close the file
178 ;;; associated with it.
179 (/show0 "unix.lisp 391")
180 (defun unix-close (fd)
181 (declare (type unix-fd fd))
182 (void-syscall ("close" int) fd))
186 ;; A time value that is accurate to the nearest
187 ;; microsecond but also has a range of years.
188 (define-alien-type nil
190 (tv-sec time-t) ; seconds
191 (tv-usec time-t))) ; and microseconds
195 (defconstant rusage_self 0) ; the calling process
196 (defconstant rusage_children -1) ; terminated child processes
197 (defconstant rusage_both -2)
199 (define-alien-type nil
201 (ru-utime (struct timeval)) ; user time used
202 (ru-stime (struct timeval)) ; system time used.
203 (ru-maxrss long) ; maximum resident set size (in kilobytes)
204 (ru-ixrss long) ; integral shared memory size
205 (ru-idrss long) ; integral unshared data size
206 (ru-isrss long) ; integral unshared stack size
207 (ru-minflt long) ; page reclaims
208 (ru-majflt long) ; page faults
209 (ru-nswap long) ; swaps
210 (ru-inblock long) ; block input operations
211 (ru-oublock long) ; block output operations
212 (ru-msgsnd long) ; messages sent
213 (ru-msgrcv long) ; messages received
214 (ru-nsignals long) ; signals received
215 (ru-nvcsw long) ; voluntary context switches
216 (ru-nivcsw long))) ; involuntary context switches
220 ;;; Given a file path (a string) and one of four constant modes,
221 ;;; return T if the file is accessible with that mode and NIL if not.
222 ;;; When NIL, also return an errno value with NIL which tells why the
223 ;;; file was not accessible.
225 ;;; The access modes are:
226 ;;; r_ok Read permission.
227 ;;; w_ok Write permission.
228 ;;; x_ok Execute permission.
229 ;;; f_ok Presence of file.
231 ;;; In Windows, the MODE argument to access is defined in terms of
232 ;;; literal magic numbers---there are no constants to grovel. X_OK
238 (defconstant r_ok 4))
240 (defun unix-access (path mode)
241 (declare (type unix-pathname path)
243 (void-syscall ("access" c-string int) path mode))
245 ;;; values for the second argument to UNIX-LSEEK
246 (defconstant l_set 0) ; to set the file pointer
247 (defconstant l_incr 1) ; to increment the file pointer
248 (defconstant l_xtnd 2) ; to extend the file size
250 ;;; Is a stream interactive?
251 (defun unix-isatty (fd)
252 (declare (type unix-fd fd))
253 (int-syscall ("isatty" int) fd))
255 (defun unix-lseek (fd offset whence)
256 "Unix-lseek accepts a file descriptor and moves the file pointer by
257 OFFSET octets. Whence can be any of the following:
259 L_SET Set the file pointer.
260 L_INCR Increment the file pointer.
261 L_XTND Extend the file size.
263 (declare (type unix-fd fd)
264 (type (integer 0 2) whence))
265 (let ((result (alien-funcall (extern-alien #!-largefile "lseek"
266 #!+largefile "lseek_largefile"
267 (function off-t int off-t int))
270 (values nil (get-errno))
273 ;;; UNIX-READ accepts a file descriptor, a buffer, and the length to read.
274 ;;; It attempts to read len bytes from the device associated with fd
275 ;;; and store them into the buffer. It returns the actual number of
277 (defun unix-read (fd buf len)
278 (declare (type unix-fd fd)
279 (type (unsigned-byte 32) len))
281 (int-syscall ("read" int (* char) int) fd buf len))
283 ;;; UNIX-WRITE accepts a file descriptor, a buffer, an offset, and the
284 ;;; length to write. It attempts to write len bytes to the device
285 ;;; associated with fd from the buffer starting at offset. It returns
286 ;;; the actual number of bytes written.
287 (defun unix-write (fd buf offset len)
288 (declare (type unix-fd fd)
289 (type (unsigned-byte 32) offset len))
290 (int-syscall ("write" int (* char) int)
292 (with-alien ((ptr (* char) (etypecase buf
293 ((simple-array * (*))
297 (addr (deref ptr offset)))
300 ;;; Set up a unix-piping mechanism consisting of an input pipe and an
301 ;;; output pipe. Return two values: if no error occurred the first
302 ;;; value is the pipe to be read from and the second is can be written
303 ;;; to. If an error occurred the first value is NIL and the second the
307 (with-alien ((fds (array int 2)))
308 (syscall ("pipe" (* int))
309 (values (deref fds 0) (deref fds 1))
310 (cast fds (* int)))))
312 (defun msvcrt-raw-pipe (fds size mode)
313 (syscall ("_pipe" (* int) int int)
314 (values (deref fds 0) (deref fds 1))
315 (cast fds (* int)) size mode))
318 (with-alien ((fds (array int 2)))
319 (msvcrt-raw-pipe fds 256 o_binary)))
321 ;; Windows mkdir() doesn't take the mode argument. It's cdecl, so we could
322 ;; actually call it passing the mode argument, but some sharp-eyed reader
323 ;; would put five and twenty-seven together and ask us about it, so...
326 (defun unix-mkdir (name mode)
327 (declare (type unix-pathname name)
328 (type unix-file-mode mode)
329 #!+win32 (ignore mode))
330 (void-syscall ("mkdir" c-string #!-win32 int) name #!-win32 mode))
332 ;;; Given a C char* pointer allocated by malloc(), free it and return a
333 ;;; corresponding Lisp string (or return NIL if the pointer is a C NULL).
334 (defun newcharstar-string (newcharstar)
335 (declare (type (alien (* char)) newcharstar))
336 (if (null-alien newcharstar)
339 (cast newcharstar c-string)
340 (free-alien newcharstar))))
342 ;;; Return the Unix current directory as a SIMPLE-STRING, in the
343 ;;; style returned by getcwd() (no trailing slash character).
345 (defun posix-getcwd ()
346 ;; This implementation relies on a BSD/Linux extension to getcwd()
347 ;; behavior, automatically allocating memory when a null buffer
348 ;; pointer is used. On a system which doesn't support that
349 ;; extension, it'll have to be rewritten somehow.
351 ;; SunOS and OSF/1 provide almost as useful an extension: if given a null
352 ;; buffer pointer, it will automatically allocate size space. The
353 ;; KLUDGE in this solution arises because we have just read off
354 ;; PATH_MAX+1 from the Solaris header files and stuck it in here as
355 ;; a constant. Going the grovel_headers route doesn't seem to be
356 ;; helpful, either, as Solaris doesn't export PATH_MAX from
359 ;; FIXME: The (,stub,) nastiness produces an error message about a
360 ;; comma not inside a backquote. This error has absolutely nothing
361 ;; to do with the actual meaning of the error (and little to do with
362 ;; its location, either).
363 #!-(or linux openbsd freebsd netbsd sunos osf1 darwin win32) (,stub,)
364 #!+(or linux openbsd freebsd netbsd sunos osf1 darwin win32)
365 (or (newcharstar-string (alien-funcall (extern-alien "getcwd"
370 #!+(or linux openbsd freebsd netbsd darwin win32) 0
371 #!+(or sunos osf1) 1025))
372 (simple-perror "getcwd")))
374 ;;; Return the Unix current directory as a SIMPLE-STRING terminated
375 ;;; by a slash character.
376 (defun posix-getcwd/ ()
377 (concatenate 'string (posix-getcwd) "/"))
379 ;;; Duplicate an existing file descriptor (given as the argument) and
380 ;;; return it. If FD is not a valid file descriptor, NIL and an error
381 ;;; number are returned.
383 (declare (type unix-fd fd))
384 (int-syscall ("dup" int) fd))
386 ;;; Terminate the current process with an optional error code. If
387 ;;; successful, the call doesn't return. If unsuccessful, the call
388 ;;; returns NIL and an error number.
389 (defun unix-exit (&optional (code 0))
390 (declare (type (signed-byte 32) code))
391 (void-syscall ("exit" int) code))
393 ;;; Return the process id of the current process.
394 (define-alien-routine ("getpid" unix-getpid) int)
396 ;;; Return the real user id associated with the current process.
398 (define-alien-routine ("getuid" unix-getuid) int)
400 ;;; Translate a user id into a login name.
402 (defun uid-username (uid)
403 (or (newcharstar-string (alien-funcall (extern-alien "uid_username"
404 (function (* char) int))
406 (error "found no match for Unix uid=~S" uid)))
408 ;;; Return the namestring of the home directory, being careful to
409 ;;; include a trailing #\/
411 (defun uid-homedir (uid)
412 (or (newcharstar-string (alien-funcall (extern-alien "uid_homedir"
413 (function (* char) int))
415 (error "failed to resolve home directory for Unix uid=~S" uid)))
417 ;;; Invoke readlink(2) on the file name specified by PATH. Return
418 ;;; (VALUES LINKSTRING NIL) on success, or (VALUES NIL ERRNO) on
421 (defun unix-readlink (path)
422 (declare (type unix-pathname path))
423 (with-alien ((ptr (* char)
424 (alien-funcall (extern-alien
426 (function (* char) c-string))
429 (values nil (get-errno))
430 (multiple-value-prog1
431 (values (with-alien ((c-string c-string ptr)) c-string)
435 ;; Win32 doesn't do links, but something likes to call this anyway.
436 ;; Something in this file, no less. But it only takes one result, so...
437 (defun unix-readlink (path)
438 (declare (ignore path))
441 ;;; UNIX-UNLINK accepts a name and deletes the directory entry for that
442 ;;; name and the file if this is the last link.
443 (defun unix-unlink (name)
444 (declare (type unix-pathname name))
445 (void-syscall ("unlink" c-string) name))
447 ;;; Return the name of the host machine as a string.
449 (defun unix-gethostname ()
450 (with-alien ((buf (array char 256)))
451 (syscall ("gethostname" (* char) int)
453 (cast buf (* char)) 256)))
456 (defun unix-setsid ()
457 (int-syscall ("setsid")))
461 ;;; UNIX-IOCTL performs a variety of operations on open i/o
462 ;;; descriptors. See the UNIX Programmer's Manual for more
465 (defun unix-ioctl (fd cmd arg)
466 (declare (type unix-fd fd)
467 (type (signed-byte 32) cmd))
468 (void-syscall ("ioctl" int int (* char)) fd cmd arg))
472 ;;; FIXME: All we seem to need is the RUSAGE_SELF version of this.
474 ;;; This is like getrusage(2), except it returns only the system and
475 ;;; user time, and returns the seconds and microseconds as separate
477 #!-sb-fluid (declaim (inline unix-fast-getrusage))
479 (defun unix-fast-getrusage (who)
480 (declare (values (member t)
481 (unsigned-byte 31) (integer 0 1000000)
482 (unsigned-byte 31) (integer 0 1000000)))
483 (with-alien ((usage (struct rusage)))
484 (syscall* ("getrusage" int (* (struct rusage)))
486 (slot (slot usage 'ru-utime) 'tv-sec)
487 (slot (slot usage 'ru-utime) 'tv-usec)
488 (slot (slot usage 'ru-stime) 'tv-sec)
489 (slot (slot usage 'ru-stime) 'tv-usec))
492 ;;; Return information about the resource usage of the process
493 ;;; specified by WHO. WHO can be either the current process
494 ;;; (rusage_self) or all of the terminated child processes
495 ;;; (rusage_children). NIL and an error number is returned if the call
498 (defun unix-getrusage (who)
499 (with-alien ((usage (struct rusage)))
500 (syscall ("getrusage" int (* (struct rusage)))
502 (+ (* (slot (slot usage 'ru-utime) 'tv-sec) 1000000)
503 (slot (slot usage 'ru-utime) 'tv-usec))
504 (+ (* (slot (slot usage 'ru-stime) 'tv-sec) 1000000)
505 (slot (slot usage 'ru-stime) 'tv-usec))
506 (slot usage 'ru-maxrss)
507 (slot usage 'ru-ixrss)
508 (slot usage 'ru-idrss)
509 (slot usage 'ru-isrss)
510 (slot usage 'ru-minflt)
511 (slot usage 'ru-majflt)
512 (slot usage 'ru-nswap)
513 (slot usage 'ru-inblock)
514 (slot usage 'ru-oublock)
515 (slot usage 'ru-msgsnd)
516 (slot usage 'ru-msgrcv)
517 (slot usage 'ru-nsignals)
518 (slot usage 'ru-nvcsw)
519 (slot usage 'ru-nivcsw))
524 ;;;; FIXME: Why have both UNIX-SELECT and UNIX-FAST-SELECT?
526 ;;; Perform the UNIX select(2) system call.
527 (declaim (inline unix-fast-select)) ; (used to be a macro in CMU CL)
528 (defun unix-fast-select (num-descriptors
529 read-fds write-fds exception-fds
530 timeout-secs &optional (timeout-usecs 0))
531 (declare (type (integer 0 #.fd-setsize) num-descriptors)
532 (type (or (alien (* (struct fd-set))) null)
533 read-fds write-fds exception-fds)
534 (type (or null (unsigned-byte 31)) timeout-secs)
535 (type (unsigned-byte 31) timeout-usecs))
537 ;; (declare (optimize (speed 3) (safety 0) (inhibit-warnings 3)))
538 ;; here. Is that important for SBCL? If so, why? Profiling might tell us..
539 (with-alien ((tv (struct timeval)))
541 (setf (slot tv 'tv-sec) timeout-secs)
542 (setf (slot tv 'tv-usec) timeout-usecs))
543 (int-syscall ("select" int (* (struct fd-set)) (* (struct fd-set))
544 (* (struct fd-set)) (* (struct timeval)))
545 num-descriptors read-fds write-fds exception-fds
546 (if timeout-secs (alien-sap (addr tv)) (int-sap 0)))))
548 ;;; UNIX-SELECT accepts sets of file descriptors and waits for an event
549 ;;; to happen on one of them or to time out.
550 (defmacro num-to-fd-set (fdset num)
553 (setf (deref (slot ,fdset 'fds-bits) 0) ,num)
554 ,@(loop for index upfrom 1 below (/ fd-setsize
555 sb!vm:n-machine-word-bits)
556 collect `(setf (deref (slot ,fdset 'fds-bits) ,index) 0)))
558 ,@(loop for index upfrom 0 below (/ fd-setsize
559 sb!vm:n-machine-word-bits)
560 collect `(setf (deref (slot ,fdset 'fds-bits) ,index)
561 (ldb (byte sb!vm:n-machine-word-bits
562 ,(* index sb!vm:n-machine-word-bits))
565 (defmacro fd-set-to-num (nfds fdset)
566 `(if (<= ,nfds sb!vm:n-machine-word-bits)
567 (deref (slot ,fdset 'fds-bits) 0)
568 (+ ,@(loop for index upfrom 0 below (/ fd-setsize
569 sb!vm:n-machine-word-bits)
570 collect `(ash (deref (slot ,fdset 'fds-bits) ,index)
571 ,(* index sb!vm:n-machine-word-bits))))))
573 ;;; Examine the sets of descriptors passed as arguments to see whether
574 ;;; they are ready for reading and writing. See the UNIX Programmer's
575 ;;; Manual for more information.
576 (defun unix-select (nfds rdfds wrfds xpfds to-secs &optional (to-usecs 0))
577 (declare (type (integer 0 #.fd-setsize) nfds)
578 (type unsigned-byte rdfds wrfds xpfds)
579 (type (or (unsigned-byte 31) null) to-secs)
580 (type (unsigned-byte 31) to-usecs)
581 (optimize (speed 3) (safety 0) (inhibit-warnings 3)))
582 (with-alien ((tv (struct timeval))
583 (rdf (struct fd-set))
584 (wrf (struct fd-set))
585 (xpf (struct fd-set)))
587 (setf (slot tv 'tv-sec) to-secs)
588 (setf (slot tv 'tv-usec) to-usecs))
589 (num-to-fd-set rdf rdfds)
590 (num-to-fd-set wrf wrfds)
591 (num-to-fd-set xpf xpfds)
592 (macrolet ((frob (lispvar alienvar)
593 `(if (zerop ,lispvar)
595 (alien-sap (addr ,alienvar)))))
596 (syscall ("select" int (* (struct fd-set)) (* (struct fd-set))
597 (* (struct fd-set)) (* (struct timeval)))
599 (fd-set-to-num nfds rdf)
600 (fd-set-to-num nfds wrf)
601 (fd-set-to-num nfds xpf))
602 nfds (frob rdfds rdf) (frob wrfds wrf) (frob xpfds xpf)
603 (if to-secs (alien-sap (addr tv)) (int-sap 0))))))
607 ;;; This is a structure defined in src/runtime/wrap.c, to look
608 ;;; basically like "struct stat" according to stat(2). It may not
609 ;;; actually correspond to the real in-memory stat structure that the
610 ;;; syscall uses, and that's OK. Linux in particular is packed full of
611 ;;; stat macros, and trying to keep Lisp code in correspondence with
612 ;;; it is more pain than it's worth, so we just let our C runtime
613 ;;; synthesize a nice consistent structure for us.
615 ;;; Note that st-dev is a long, not a dev-t. This is because dev-t on
616 ;;; linux 32 bit archs is a 64 bit quantity, but alien doesn't support
617 ;;; those. We don't actually access that field anywhere, though, so
618 ;;; until we can get 64 bit alien support it'll do. Also note that
619 ;;; st_size is a long, not an off-t, because off-t is a 64-bit
620 ;;; quantity on Alpha. And FIXME: "No one would want a file length
621 ;;; longer than 32 bits anyway, right?":-|
622 (define-alien-type nil
624 (st-dev #!-(or mips largefile) unsigned-int
625 #!+mips unsigned-long
632 (st-rdev #!-(or mips largefile) unsigned-int
633 #!+mips unsigned-long
635 (st-size #!-(or mips largefile) unsigned-int
636 #!+(or mips largefile) off-t)
637 (st-blksize unsigned-long)
638 (st-blocks unsigned-long)
643 ;;; shared C-struct-to-multiple-VALUES conversion for the stat(2)
644 ;;; family of Unix system calls
646 ;;; FIXME: I think this should probably not be INLINE. However, when
647 ;;; this was not inline, it seemed to cause memory corruption
648 ;;; problems. My first guess is that it's a bug in the FFI code, where
649 ;;; the WITH-ALIEN expansion doesn't deal well with being wrapped
650 ;;; around a call to a function returning >10 values. But I didn't try
651 ;;; to figure it out, just inlined it as a quick fix. Perhaps someone
652 ;;; who's motivated to debug the FFI code can go over the DISASSEMBLE
653 ;;; output in the not-inlined case and see whether there's a problem,
654 ;;; and maybe even find a fix..
655 (declaim (inline %extract-stat-results))
656 (defun %extract-stat-results (wrapped-stat)
657 (declare (type (alien (* (struct wrapped_stat))) wrapped-stat))
659 (slot wrapped-stat 'st-dev)
660 (slot wrapped-stat 'st-ino)
661 (slot wrapped-stat 'st-mode)
662 (slot wrapped-stat 'st-nlink)
663 (slot wrapped-stat 'st-uid)
664 (slot wrapped-stat 'st-gid)
665 (slot wrapped-stat 'st-rdev)
666 (slot wrapped-stat 'st-size)
667 (slot wrapped-stat 'st-atime)
668 (slot wrapped-stat 'st-mtime)
669 (slot wrapped-stat 'st-ctime)
670 (slot wrapped-stat 'st-blksize)
671 (slot wrapped-stat 'st-blocks)))
673 ;;; Unix system calls in the stat(2) family are handled by calls to
674 ;;; C-level wrapper functions which copy all the raw "struct stat"
675 ;;; slots into the system-independent wrapped_stat format.
676 ;;; stat(2) <-> stat_wrapper()
677 ;;; fstat(2) <-> fstat_wrapper()
678 ;;; lstat(2) <-> lstat_wrapper()
679 (defun unix-stat (name)
680 (declare (type unix-pathname name))
681 (with-alien ((buf (struct wrapped_stat)))
682 (syscall ("stat_wrapper" c-string (* (struct wrapped_stat)))
683 (%extract-stat-results (addr buf))
685 (defun unix-lstat (name)
686 (declare (type unix-pathname name))
687 (with-alien ((buf (struct wrapped_stat)))
688 (syscall ("lstat_wrapper" c-string (* (struct wrapped_stat)))
689 (%extract-stat-results (addr buf))
691 (defun unix-fstat (fd)
692 (declare (type unix-fd fd))
693 (with-alien ((buf (struct wrapped_stat)))
694 (syscall ("fstat_wrapper" int (* (struct wrapped_stat)))
695 (%extract-stat-results (addr buf))
700 ;; the POSIX.4 structure for a time value. This is like a "struct
701 ;; timeval" but has nanoseconds instead of microseconds.
702 (define-alien-type nil
704 (tv-sec long) ; seconds
705 (tv-nsec long))) ; nanoseconds
707 ;; used by other time functions
708 (define-alien-type nil
710 (tm-sec int) ; Seconds. [0-60] (1 leap second)
711 (tm-min int) ; Minutes. [0-59]
712 (tm-hour int) ; Hours. [0-23]
713 (tm-mday int) ; Day. [1-31]
714 (tm-mon int) ; Month. [0-11]
715 (tm-year int) ; Year - 1900.
716 (tm-wday int) ; Day of week. [0-6]
717 (tm-yday int) ; Days in year. [0-365]
718 (tm-isdst int) ; DST. [-1/0/1]
719 (tm-gmtoff long) ; Seconds east of UTC.
720 (tm-zone c-string))) ; Timezone abbreviation.
722 (define-alien-routine get-timezone sb!alien:void
723 (when sb!alien:long :in)
724 (seconds-west sb!alien:int :out)
725 (daylight-savings-p sb!alien:boolean :out))
728 (defun nanosleep (secs nsecs)
729 (with-alien ((req (struct timespec))
730 (rem (struct timespec)))
731 (setf (slot req 'tv-sec) secs)
732 (setf (slot req 'tv-nsec) nsecs)
733 (loop while (eql sb!unix:eintr
735 (int-syscall ("nanosleep" (* (struct timespec))
736 (* (struct timespec)))
737 (addr req) (addr rem))))
738 do (rotatef req rem))))
740 (defun unix-get-seconds-west (secs)
741 (multiple-value-bind (ignore seconds dst) (get-timezone secs)
742 (declare (ignore ignore) (ignore dst))
747 ;;; Structure crudely representing a timezone. KLUDGE: This is
748 ;;; obsolete and should never be used.
749 (define-alien-type nil
751 (tz-minuteswest int) ; minutes west of Greenwich
752 (tz-dsttime int))) ; type of dst correction
754 ;;; If it works, UNIX-GETTIMEOFDAY returns 5 values: T, the seconds
755 ;;; and microseconds of the current time of day, the timezone (in
756 ;;; minutes west of Greenwich), and a daylight-savings flag. If it
757 ;;; doesn't work, it returns NIL and the errno.
758 #!-sb-fluid (declaim (inline unix-gettimeofday))
759 (defun unix-gettimeofday ()
760 (with-alien ((tv (struct timeval))
761 (tz (struct timezone)))
762 (syscall* ("gettimeofday" (* (struct timeval))
763 (* (struct timezone)))
767 (slot tz 'tz-minuteswest)
768 (slot tz 'tz-dsttime))
773 ;; Type of the second argument to `getitimer' and
774 ;; the second and third arguments `setitimer'.
775 (define-alien-type nil
777 (it-interval (struct timeval)) ; timer interval
778 (it-value (struct timeval)))) ; current value
780 (defconstant itimer-real 0)
781 (defconstant itimer-virtual 1)
782 (defconstant itimer-prof 2)
785 (defun unix-getitimer (which)
786 "Unix-getitimer returns the INTERVAL and VALUE slots of one of
787 three system timers (:real :virtual or :profile). On success,
788 unix-getitimer returns 5 values,
789 T, it-interval-secs, it-interval-usec, it-value-secs, it-value-usec."
790 (declare (type (member :real :virtual :profile) which)
792 (unsigned-byte 29) (mod 1000000)
793 (unsigned-byte 29) (mod 1000000)))
794 (let ((which (ecase which
796 (:virtual itimer-virtual)
797 (:profile itimer-prof))))
798 (with-alien ((itv (struct itimerval)))
799 (syscall* ("getitimer" int (* (struct itimerval)))
801 (slot (slot itv 'it-interval) 'tv-sec)
802 (slot (slot itv 'it-interval) 'tv-usec)
803 (slot (slot itv 'it-value) 'tv-sec)
804 (slot (slot itv 'it-value) 'tv-usec))
805 which (alien-sap (addr itv))))))
808 (defun unix-setitimer (which int-secs int-usec val-secs val-usec)
809 " Unix-setitimer sets the INTERVAL and VALUE slots of one of
810 three system timers (:real :virtual or :profile). A SIGALRM signal
811 will be delivered VALUE <seconds+microseconds> from now. INTERVAL,
812 when non-zero, is <seconds+microseconds> to be loaded each time
813 the timer expires. Setting INTERVAL and VALUE to zero disables
814 the timer. See the Unix man page for more details. On success,
815 unix-setitimer returns the old contents of the INTERVAL and VALUE
816 slots as in unix-getitimer."
817 (declare (type (member :real :virtual :profile) which)
818 (type (unsigned-byte 29) int-secs val-secs)
819 (type (integer 0 (1000000)) int-usec val-usec)
821 (unsigned-byte 29) (mod 1000000)
822 (unsigned-byte 29) (mod 1000000)))
823 (let ((which (ecase which
825 (:virtual itimer-virtual)
826 (:profile itimer-prof))))
827 (with-alien ((itvn (struct itimerval))
828 (itvo (struct itimerval)))
829 (setf (slot (slot itvn 'it-interval) 'tv-sec ) int-secs
830 (slot (slot itvn 'it-interval) 'tv-usec) int-usec
831 (slot (slot itvn 'it-value ) 'tv-sec ) val-secs
832 (slot (slot itvn 'it-value ) 'tv-usec) val-usec)
833 (syscall* ("setitimer" int (* (struct timeval))(* (struct timeval)))
835 (slot (slot itvo 'it-interval) 'tv-sec)
836 (slot (slot itvo 'it-interval) 'tv-usec)
837 (slot (slot itvo 'it-value) 'tv-sec)
838 (slot (slot itvo 'it-value) 'tv-usec))
839 which (alien-sap (addr itvn))(alien-sap (addr itvo))))))
842 ;;; FIXME: Many Unix error code definitions were deleted from the old
843 ;;; CMU CL source code here, but not in the exports of SB-UNIX. I
844 ;;; (WHN) hope that someday I'll figure out an automatic way to detect
845 ;;; unused symbols in package exports, but if I don't, there are
846 ;;; enough of them all in one place here that they should probably be
849 ;;;; support routines for dealing with Unix pathnames
851 (defun unix-file-kind (name &optional check-for-links)
853 "Return either :FILE, :DIRECTORY, :LINK, :SPECIAL, or NIL."
854 (declare (simple-string name))
855 (multiple-value-bind (res dev ino mode)
856 (if check-for-links (unix-lstat name) (unix-stat name))
857 (declare (type (or fixnum null) mode)
860 (let ((kind (logand mode s-ifmt)))
861 (cond ((eql kind s-ifdir) :directory)
862 ((eql kind s-ifreg) :file)
864 ((eql kind s-iflnk) :link)
867 ;;; Is the Unix pathname PATHNAME relative, instead of absolute? (E.g.
868 ;;; "passwd" or "etc/passwd" instead of "/etc/passwd"?)
869 (defun relative-unix-pathname? (pathname)
870 (declare (type simple-string pathname))
871 (or (zerop (length pathname))
872 (char/= (schar pathname 0) #\/)))
874 ;;; Return PATHNAME with all symbolic links resolved. PATHNAME should
875 ;;; already be a complete absolute Unix pathname, since at least in
876 ;;; sbcl-0.6.12.36 we're called only from TRUENAME, and only after
877 ;;; paths have been converted to absolute paths, so we don't need to
878 ;;; try to handle any more generality than that.
879 (defun unix-resolve-links (pathname)
880 (declare (type simple-string pathname))
881 ;; KLUDGE: The Win32 platform doesn't have symbolic links, so
882 ;; short-cut this computation (and the check for being an absolute
884 #!+win32 (return-from unix-resolve-links pathname)
885 (aver (not (relative-unix-pathname? pathname)))
886 ;; KLUDGE: readlink and lstat are unreliable if given symlinks
887 ;; ending in slashes -- fix the issue here instead of waiting for
890 ;; but be careful! Must not strip the final slash from "/". (This
891 ;; adjustment might be a candidate for being transferred into the C
892 ;; code in a wrap_readlink() function, too.) CSR, 2006-01-18
893 (let ((len (length pathname)))
894 (when (and (> len 1) (eql #\/ (schar pathname (1- len))))
895 (setf pathname (subseq pathname 0 (1- len)))))
896 (/noshow "entering UNIX-RESOLVE-LINKS")
897 (loop with previous-pathnames = nil do
898 (/noshow pathname previous-pathnames)
899 (let ((link (unix-readlink pathname)))
901 ;; Unlike the old CMU CL code, we handle a broken symlink by
902 ;; returning the link itself. That way, CL:TRUENAME on a
903 ;; broken link returns the link itself, so that CL:DIRECTORY
904 ;; can return broken links, so that even without
905 ;; Unix-specific extensions to do interesting things with
906 ;; them, at least Lisp programs can see them and, if
907 ;; necessary, delete them. (This is handy e.g. when your
908 ;; managed-by-Lisp directories are visited by Emacs, which
909 ;; creates broken links as notes to itself.)
914 (if (relative-unix-pathname? link)
915 (let* ((dir-len (1+ (position #\/
918 (dir (subseq pathname 0 dir-len)))
920 (concatenate 'string dir link))
922 (if (unix-file-kind new-pathname)
923 (setf pathname new-pathname)
924 (return pathname)))))
925 ;; To generalize the principle that even if portable Lisp code
926 ;; can't do anything interesting with a broken symlink, at
927 ;; least it should be able to see and delete it, when we
928 ;; detect a cyclic link, we return the link itself. (So even
929 ;; though portable Lisp code can't do anything interesting
930 ;; with a cyclic link, at least it can see it and delete it.)
931 (if (member pathname previous-pathnames :test #'string=)
933 (push pathname previous-pathnames))))
935 ;;; UNIX specific code, that has been cleanly separated from the
939 (defconstant micro-seconds-per-internal-time-unit
940 (/ 1000000 sb!xc:internal-time-units-per-second))
942 (declaim (inline system-internal-real-time system-internal-run-time))
943 (defun system-internal-real-time ()
944 (multiple-value-bind (ignore seconds useconds) (unix-gettimeofday)
945 (declare (ignore ignore) (type (unsigned-byte 32) seconds useconds))
946 (let ((uint (truncate useconds
947 micro-seconds-per-internal-time-unit)))
948 (declare (type (unsigned-byte 32) uint))
949 (+ (* seconds sb!xc:internal-time-units-per-second)
952 (defun system-internal-run-time ()
953 (multiple-value-bind (ignore utime-sec utime-usec stime-sec stime-usec)
954 (unix-fast-getrusage rusage_self)
955 (declare (ignore ignore)
956 (type (unsigned-byte 31) utime-sec stime-sec)
957 ;; (Classic CMU CL had these (MOD 1000000) instead, but
958 ;; at least in Linux 2.2.12, the type doesn't seem to
959 ;; be documented anywhere and the observed behavior is
960 ;; to sometimes return 1000000 exactly.)
961 (type (integer 0 1000000) utime-usec stime-usec))
962 (let ((result (+ (* (+ utime-sec stime-sec)
963 sb!xc:internal-time-units-per-second)
966 (floor micro-seconds-per-internal-time-unit 2))
967 micro-seconds-per-internal-time-unit))))
970 ;;;; A magic constant for wait3().
972 ;;;; FIXME: This used to be defined in run-program.lisp as
973 ;;;; (defconstant wait-wstopped #-svr4 #o177 #+svr4 wait-wuntraced)
974 ;;;; According to some of the man pages, the #o177 is part of the API
975 ;;;; for wait3(); that said, under SunOS there is a WSTOPPED thing in
976 ;;;; the headers that may or may not be the same thing. To be
977 ;;;; investigated. -- CSR, 2002-03-25
978 (defconstant wstopped #o177)
981 ;;;; stuff not yet found in the header files
983 ;;;; Abandon all hope who enters here...
985 ;;; not checked for linux...
986 (defmacro fd-set (offset fd-set)
987 (let ((word (gensym))
989 `(multiple-value-bind (,word ,bit) (floor ,offset
990 sb!vm:n-machine-word-bits)
991 (setf (deref (slot ,fd-set 'fds-bits) ,word)
992 (logior (truly-the (unsigned-byte #.sb!vm:n-machine-word-bits)
994 (deref (slot ,fd-set 'fds-bits) ,word))))))
996 ;;; not checked for linux...
997 (defmacro fd-clr (offset fd-set)
998 (let ((word (gensym))
1000 `(multiple-value-bind (,word ,bit) (floor ,offset
1001 sb!vm:n-machine-word-bits)
1002 (setf (deref (slot ,fd-set 'fds-bits) ,word)
1003 (logand (deref (slot ,fd-set 'fds-bits) ,word)
1004 (sb!kernel:word-logical-not
1005 (truly-the (unsigned-byte #.sb!vm:n-machine-word-bits)
1008 ;;; not checked for linux...
1009 (defmacro fd-isset (offset fd-set)
1010 (let ((word (gensym))
1012 `(multiple-value-bind (,word ,bit) (floor ,offset
1013 sb!vm:n-machine-word-bits)
1014 (logbitp ,bit (deref (slot ,fd-set 'fds-bits) ,word)))))
1016 ;;; not checked for linux...
1017 (defmacro fd-zero (fd-set)
1019 ,@(loop for index upfrom 0 below (/ fd-setsize sb!vm:n-machine-word-bits)
1020 collect `(setf (deref (slot ,fd-set 'fds-bits) ,index) 0))))