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 ;;; Given a C-level zero-terminated array of C strings, return a
31 ;;; corresponding Lisp-level list of SIMPLE-STRINGs.
32 (defun c-strings->string-list (c-strings)
33 (declare (type (alien (* c-string)) c-strings))
34 (let ((reversed-result nil))
35 (dotimes (i most-positive-fixnum (error "argh! can't happen"))
36 (declare (type index i))
37 (let ((c-string (deref c-strings i)))
39 (push c-string reversed-result)
40 (return (nreverse reversed-result)))))))
42 ;;;; Lisp types used by syscalls
44 (deftype unix-pathname () 'simple-string)
45 (deftype unix-fd () `(integer 0 ,sb!xc:most-positive-fixnum))
47 (deftype unix-file-mode () '(unsigned-byte 32))
48 (deftype unix-pid () '(unsigned-byte 32))
49 (deftype unix-uid () '(unsigned-byte 32))
50 (deftype unix-gid () '(unsigned-byte 32))
54 (/show0 "unix.lisp 74")
56 ;;; FIXME: The various FOO-SYSCALL-BAR macros, and perhaps some other
57 ;;; macros in this file, are only used in this file, and could be
58 ;;; implemented using SB!XC:DEFMACRO wrapped in EVAL-WHEN.
60 ;;; SB-EXECUTABLE, at least, uses one of these macros; other libraries
61 ;;; and programs have been known to use them as well. Perhaps they
62 ;;; should live in SB-SYS or even SB-EXT?
64 (defmacro syscall ((name &rest arg-types) success-form &rest args)
65 (when (eql 3 (mismatch "[_]" name))
67 (concatenate 'string #!+win32 "_" (subseq name 3))))
69 (declare (optimize (sb!c::float-accuracy 0)))
70 (let ((result (alien-funcall (extern-alien ,name (function int ,@arg-types))
73 (values nil (get-errno))
76 ;;; This is like SYSCALL, but if it fails, signal an error instead of
77 ;;; returning error codes. Should only be used for syscalls that will
78 ;;; never really get an error.
79 (defmacro syscall* ((name &rest arg-types) success-form &rest args)
81 (declare (optimize (sb!c::float-accuracy 0)))
82 (let ((result (alien-funcall (extern-alien ,name (function int ,@arg-types))
85 (error "Syscall ~A failed: ~A" ,name (strerror))
88 (defmacro int-syscall ((name &rest arg-types) &rest args)
89 `(syscall (,name ,@arg-types) (values result 0) ,@args))
91 (defmacro with-restarted-syscall ((&optional (value (gensym))
93 syscall-form &rest body)
95 "Evaluate BODY with VALUE and ERRNO bound to the return values of
96 SYSCALL-FORM. Repeat evaluation of SYSCALL-FORM if it is interrupted."
98 (loop (multiple-value-setq (,value ,errno)
100 (unless #!-win32 (eql ,errno sb!unix:eintr) #!+win32 nil
101 (return (values ,value ,errno))))
104 (defmacro void-syscall ((name &rest arg-types) &rest args)
105 `(syscall (,name ,@arg-types) (values t 0) ,@args))
109 (defconstant espipe 29))
111 ;;;; hacking the Unix environment
114 (define-alien-routine ("getenv" posix-getenv) c-string
115 "Return the \"value\" part of the environment string \"name=value\" which
116 corresponds to NAME, or NIL if there is none."
117 (name (c-string :not-null t)))
121 ;;; Rename the file with string NAME1 to the string NAME2. NIL and an
122 ;;; error code is returned if an error occurs.
124 (defun unix-rename (name1 name2)
125 (declare (type unix-pathname name1 name2))
126 (void-syscall ("rename" (c-string :not-null t)
127 (c-string :not-null t))
130 ;;; from sys/types.h and gnu/types.h
132 (/show0 "unix.lisp 220")
134 ;;; FIXME: We shouldn't hand-copy types from header files into Lisp
135 ;;; like this unless we have extreme provocation. Reading directories
136 ;;; is not extreme enough, since it doesn't need to be blindingly
137 ;;; fast: we can just implement those functions in C as a wrapper
139 (define-alien-type fd-mask unsigned-long)
141 (define-alien-type nil
143 (fds-bits (array fd-mask #.(/ fd-setsize
144 sb!vm:n-machine-word-bits)))))
146 (/show0 "unix.lisp 304")
151 ;;;; POSIX Standard: 6.5 File Control Operations <fcntl.h>
153 ;;; Open the file whose pathname is specified by PATH for reading
154 ;;; and/or writing as specified by the FLAGS argument. Various FLAGS
155 ;;; masks (O_RDONLY etc.) are defined in fcntlbits.h.
157 ;;; If the O_CREAT flag is specified, then the file is created with a
158 ;;; permission of argument MODE if the file doesn't exist. An integer
159 ;;; file descriptor is returned by UNIX-OPEN.
160 (defun unix-open (path flags mode)
161 (declare (type unix-pathname path)
163 (type unix-file-mode mode))
164 #!+win32 (sb!win32:unixlike-open path flags mode)
166 (with-restarted-syscall (value errno)
167 (int-syscall ("open" c-string int int)
169 (logior #!+win32 o_binary
170 #!+largefile o_largefile
174 ;;; UNIX-CLOSE accepts a file descriptor and attempts to close the file
175 ;;; associated with it.
176 (/show0 "unix.lisp 391")
177 (defun unix-close (fd)
178 #!+win32 (sb!win32:unixlike-close fd)
179 #!-win32 (declare (type unix-fd fd))
180 #!-win32 (void-syscall ("close" int) fd))
184 ;;; There are good reasons to implement some OPEN options with an
185 ;;; mkstemp(3)-like routine, but we don't do that yet. Instead, this
186 ;;; function is used only to make a temporary file for RUN-PROGRAM.
187 ;;; sb_mkstemp() is a wrapper that lives in src/runtime/wrap.c. Since
188 ;;; SUSv3 mkstemp() doesn't specify the mode of the created file and
189 ;;; since we have to implement most of this ourselves for Windows
190 ;;; anyway, it seems worthwhile to depart from the mkstemp()
191 ;;; specification by taking a mode to use when creating the new file.
192 (defun sb-mkstemp (template-string mode)
193 (declare (type string template-string)
194 (type unix-file-mode mode))
195 (let ((template-buffer (string-to-octets template-string :null-terminate t)))
196 (with-pinned-objects (template-buffer)
197 (let ((fd (alien-funcall (extern-alien "sb_mkstemp"
198 (function int (* char) int))
199 (vector-sap template-buffer)
202 (values nil (get-errno))
203 (values fd (octets-to-string template-buffer)))))))
207 ;; A time value that is accurate to the nearest
208 ;; microsecond but also has a range of years.
209 ;; CLH: Note that tv-usec used to be a time-t, but that this seems
210 ;; problematic on Darwin x86-64 (and wrong). Trying suseconds-t.
211 #!-(or win32 openbsd netbsd)
212 (define-alien-type nil
214 (tv-sec time-t) ; seconds
215 (tv-usec suseconds-t))) ; and microseconds
217 ;; The above definition doesn't work on 64-bit OpenBSD platforms.
218 ;; Both tv_sec and tv_usec are declared as long instead of time_t, and
219 ;; time_t is a typedef for int.
220 #!+(or openbsd netbsd)
221 (define-alien-type nil
223 (tv-sec long) ; seconds
224 (tv-usec long))) ; and microseconds
227 (define-alien-type nil
229 (tv-sec time-t) ; seconds
230 (tv-usec long))) ; and microseconds
234 (defconstant rusage_self 0) ; the calling process
235 (defconstant rusage_children -1) ; terminated child processes
236 (defconstant rusage_both -2)
238 (define-alien-type nil
240 (ru-utime (struct timeval)) ; user time used
241 (ru-stime (struct timeval)) ; system time used.
242 (ru-maxrss long) ; maximum resident set size (in kilobytes)
243 (ru-ixrss long) ; integral shared memory size
244 (ru-idrss long) ; integral unshared data size
245 (ru-isrss long) ; integral unshared stack size
246 (ru-minflt long) ; page reclaims
247 (ru-majflt long) ; page faults
248 (ru-nswap long) ; swaps
249 (ru-inblock long) ; block input operations
250 (ru-oublock long) ; block output operations
251 (ru-msgsnd long) ; messages sent
252 (ru-msgrcv long) ; messages received
253 (ru-nsignals long) ; signals received
254 (ru-nvcsw long) ; voluntary context switches
255 (ru-nivcsw long))) ; involuntary context switches
259 ;;; Given a file path (a string) and one of four constant modes,
260 ;;; return T if the file is accessible with that mode and NIL if not.
261 ;;; When NIL, also return an errno value with NIL which tells why the
262 ;;; file was not accessible.
264 ;;; The access modes are:
265 ;;; r_ok Read permission.
266 ;;; w_ok Write permission.
267 ;;; x_ok Execute permission.
268 ;;; f_ok Presence of file.
270 ;;; In Windows, the MODE argument to access is defined in terms of
271 ;;; literal magic numbers---there are no constants to grovel. X_OK
277 (defconstant r_ok 4))
279 (defun unix-access (path mode)
280 (declare (type unix-pathname path)
282 (void-syscall ("[_]access" c-string int) path mode))
284 ;;; values for the second argument to UNIX-LSEEK
285 ;;; Note that nowadays these are called SEEK_SET, SEEK_CUR, and SEEK_END
286 (defconstant l_set 0) ; to set the file pointer
287 (defconstant l_incr 1) ; to increment the file pointer
288 (defconstant l_xtnd 2) ; to extend the file size
290 ;;; Is a stream interactive?
291 (defun unix-isatty (fd)
292 (declare (type unix-fd fd))
293 (int-syscall ("[_]isatty" int) fd))
295 (defun unix-lseek (fd offset whence)
296 "Unix-lseek accepts a file descriptor and moves the file pointer by
297 OFFSET octets. Whence can be any of the following:
299 L_SET Set the file pointer.
300 L_INCR Increment the file pointer.
301 L_XTND Extend the file size.
303 (declare (type unix-fd fd)
304 (type (integer 0 2) whence))
305 (let ((result #!-win32
306 (alien-funcall (extern-alien #!-largefile "lseek"
307 #!+largefile "lseek_largefile"
308 (function off-t int off-t int))
310 #!+win32 (sb!win32:lseeki64 fd offset whence)))
312 (values nil (get-errno))
315 ;;; UNIX-READ accepts a file descriptor, a buffer, and the length to read.
316 ;;; It attempts to read len bytes from the device associated with fd
317 ;;; and store them into the buffer. It returns the actual number of
321 (declaim (maybe-inline unix-read))
323 (defun unix-read (fd buf len)
324 (declare (type unix-fd fd)
325 (type (unsigned-byte 32) len))
326 (int-syscall (#!-win32 "read" #!+win32 "win32_unix_read"
327 int (* char) int) fd buf len))
329 ;;; UNIX-WRITE accepts a file descriptor, a buffer, an offset, and the
330 ;;; length to write. It attempts to write len bytes to the device
331 ;;; associated with fd from the buffer starting at offset. It returns
332 ;;; the actual number of bytes written.
333 (defun unix-write (fd buf offset len)
334 (declare (type unix-fd fd)
335 (type (unsigned-byte 32) offset len))
337 (declare (system-area-pointer sap))
338 (int-syscall (#!-win32 "write" #!+win32 "win32_unix_write"
341 (with-alien ((ptr (* char) sap))
342 (addr (deref ptr offset)))
345 ((simple-array * (*))
346 (with-pinned-objects (buf)
347 (%write (vector-sap buf))))
351 ;;; Set up a unix-piping mechanism consisting of an input pipe and an
352 ;;; output pipe. Return two values: if no error occurred the first
353 ;;; value is the pipe to be read from and the second is can be written
354 ;;; to. If an error occurred the first value is NIL and the second the
358 (with-alien ((fds (array int 2)))
359 (syscall ("pipe" (* int))
360 (values (deref fds 0) (deref fds 1))
361 (cast fds (* int)))))
363 (defun msvcrt-raw-pipe (fds size mode)
364 (syscall ("_pipe" (* int) int int)
365 (values (deref fds 0) (deref fds 1))
366 (cast fds (* int)) size mode))
369 (with-alien ((fds (array int 2)))
370 (msvcrt-raw-pipe fds 256 o_binary)))
372 ;; Windows mkdir() doesn't take the mode argument. It's cdecl, so we could
373 ;; actually call it passing the mode argument, but some sharp-eyed reader
374 ;; would put five and twenty-seven together and ask us about it, so...
377 (defun unix-mkdir (name mode)
378 (declare (type unix-pathname name)
379 (type unix-file-mode mode)
380 #!+win32 (ignore mode))
381 (void-syscall ("mkdir" c-string #!-win32 int) name #!-win32 mode))
383 ;;; Given a C char* pointer allocated by malloc(), free it and return a
384 ;;; corresponding Lisp string (or return NIL if the pointer is a C NULL).
385 (defun newcharstar-string (newcharstar)
386 (declare (type (alien (* char)) newcharstar))
387 (if (null-alien newcharstar)
390 (cast newcharstar c-string)
391 (free-alien newcharstar))))
393 ;;; Return the Unix current directory as a SIMPLE-STRING, in the
394 ;;; style returned by getcwd() (no trailing slash character).
396 (defun posix-getcwd ()
397 ;; This implementation relies on a BSD/Linux extension to getcwd()
398 ;; behavior, automatically allocating memory when a null buffer
399 ;; pointer is used. On a system which doesn't support that
400 ;; extension, it'll have to be rewritten somehow.
402 ;; SunOS and OSF/1 provide almost as useful an extension: if given a null
403 ;; buffer pointer, it will automatically allocate size space. The
404 ;; KLUDGE in this solution arises because we have just read off
405 ;; PATH_MAX+1 from the Solaris header files and stuck it in here as
406 ;; a constant. Going the grovel_headers route doesn't seem to be
407 ;; helpful, either, as Solaris doesn't export PATH_MAX from
410 ;; FIXME: The (,stub,) nastiness produces an error message about a
411 ;; comma not inside a backquote. This error has absolutely nothing
412 ;; to do with the actual meaning of the error (and little to do with
413 ;; its location, either).
414 #!-(or linux openbsd freebsd netbsd sunos osf1 darwin hpux win32) (,stub,)
415 #!+(or linux openbsd freebsd netbsd sunos osf1 darwin hpux win32)
416 (or (newcharstar-string (alien-funcall (extern-alien "getcwd"
421 #!+(or linux openbsd freebsd netbsd darwin win32) 0
422 #!+(or sunos osf1 hpux) 1025))
423 (simple-perror "getcwd")))
425 ;;; Return the Unix current directory as a SIMPLE-STRING terminated
426 ;;; by a slash character.
427 (defun posix-getcwd/ ()
428 (concatenate 'string (posix-getcwd) "/"))
430 ;;; Duplicate an existing file descriptor (given as the argument) and
431 ;;; return it. If FD is not a valid file descriptor, NIL and an error
432 ;;; number are returned.
434 (declare (type unix-fd fd))
435 (int-syscall ("[_]dup" int) fd))
437 ;;; Terminate the current process with an optional error code. If
438 ;;; successful, the call doesn't return. If unsuccessful, the call
439 ;;; returns NIL and an error number.
440 (deftype exit-code ()
442 (defun os-exit (code &key abort)
444 "Exit the process with CODE. If ABORT is true, exit is performed using _exit(2),
445 avoiding atexit(3) hooks, etc. Otherwise exit(2) is called."
446 (unless (typep code 'exit-code)
447 (setf code (if abort 1 0)))
449 (void-syscall ("_exit" int) code)
450 (void-syscall ("exit" int) code)))
452 (define-deprecated-function :early "1.0.56.55" unix-exit os-exit (code)
455 ;;; Return the process id of the current process.
456 (define-alien-routine (#!+win32 "_getpid" #!-win32 "getpid" unix-getpid) int)
458 ;;; Return the real user id associated with the current process.
460 (define-alien-routine ("getuid" unix-getuid) int)
462 ;;; Translate a user id into a login name.
464 (defun uid-username (uid)
465 (or (newcharstar-string (alien-funcall (extern-alien "uid_username"
466 (function (* char) int))
468 (error "found no match for Unix uid=~S" uid)))
470 ;;; Return the namestring of the home directory, being careful to
471 ;;; include a trailing #\/
474 (defun uid-homedir (uid)
475 (or (newcharstar-string (alien-funcall (extern-alien "uid_homedir"
476 (function (* char) int))
478 (error "failed to resolve home directory for Unix uid=~S" uid)))
480 (defun user-homedir (uid)
481 (or (newcharstar-string (alien-funcall (extern-alien "user_homedir"
482 (function (* char) c-string))
484 (error "failed to resolve home directory for Unix uid=~S" uid))))
486 ;;; Invoke readlink(2) on the file name specified by PATH. Return
487 ;;; (VALUES LINKSTRING NIL) on success, or (VALUES NIL ERRNO) on
490 (defun unix-readlink (path)
491 (declare (type unix-pathname path))
492 (with-alien ((ptr (* char)
493 (alien-funcall (extern-alien
495 (function (* char) c-string))
498 (values nil (get-errno))
499 (multiple-value-prog1
500 (values (with-alien ((c-string c-string ptr)) c-string)
504 ;; Win32 doesn't do links, but something likes to call this anyway.
505 ;; Something in this file, no less. But it only takes one result, so...
506 (defun unix-readlink (path)
507 (declare (ignore path))
510 (defun unix-realpath (path)
511 (declare (type unix-pathname path))
512 (with-alien ((ptr (* char)
513 (alien-funcall (extern-alien
515 (function (* char) c-string))
518 (values nil (get-errno))
519 (multiple-value-prog1
520 (values (with-alien ((c-string c-string ptr)) c-string)
524 ;;; UNIX-UNLINK accepts a name and deletes the directory entry for that
525 ;;; name and the file if this is the last link.
526 (defun unix-unlink (name)
527 (declare (type unix-pathname name))
528 (void-syscall ("[_]unlink" c-string) name))
530 ;;; Return the name of the host machine as a string.
532 (defun unix-gethostname ()
533 (with-alien ((buf (array char 256)))
534 (syscall ("gethostname" (* char) int)
536 (cast buf (* char)) 256)))
539 (defun unix-setsid ()
540 (int-syscall ("setsid")))
544 ;;; UNIX-IOCTL performs a variety of operations on open i/o
545 ;;; descriptors. See the UNIX Programmer's Manual for more
548 (defun unix-ioctl (fd cmd arg)
549 (declare (type unix-fd fd)
550 (type (signed-byte 32) cmd))
551 (void-syscall ("ioctl" int int (* char)) fd cmd arg))
555 ;;; FIXME: All we seem to need is the RUSAGE_SELF version of this.
557 ;;; This is like getrusage(2), except it returns only the system and
558 ;;; user time, and returns the seconds and microseconds as separate
560 #!-sb-fluid (declaim (inline unix-fast-getrusage))
562 (defun unix-fast-getrusage (who)
563 (declare (values (member t)
564 (unsigned-byte 31) (integer 0 1000000)
565 (unsigned-byte 31) (integer 0 1000000)))
566 (with-alien ((usage (struct rusage)))
567 (syscall* ("getrusage" int (* (struct rusage)))
569 (slot (slot usage 'ru-utime) 'tv-sec)
570 (slot (slot usage 'ru-utime) 'tv-usec)
571 (slot (slot usage 'ru-stime) 'tv-sec)
572 (slot (slot usage 'ru-stime) 'tv-usec))
575 ;;; Return information about the resource usage of the process
576 ;;; specified by WHO. WHO can be either the current process
577 ;;; (rusage_self) or all of the terminated child processes
578 ;;; (rusage_children). NIL and an error number is returned if the call
581 (defun unix-getrusage (who)
582 (with-alien ((usage (struct rusage)))
583 (syscall ("getrusage" int (* (struct rusage)))
585 (+ (* (slot (slot usage 'ru-utime) 'tv-sec) 1000000)
586 (slot (slot usage 'ru-utime) 'tv-usec))
587 (+ (* (slot (slot usage 'ru-stime) 'tv-sec) 1000000)
588 (slot (slot usage 'ru-stime) 'tv-usec))
589 (slot usage 'ru-maxrss)
590 (slot usage 'ru-ixrss)
591 (slot usage 'ru-idrss)
592 (slot usage 'ru-isrss)
593 (slot usage 'ru-minflt)
594 (slot usage 'ru-majflt)
595 (slot usage 'ru-nswap)
596 (slot usage 'ru-inblock)
597 (slot usage 'ru-oublock)
598 (slot usage 'ru-msgsnd)
599 (slot usage 'ru-msgrcv)
600 (slot usage 'ru-nsignals)
601 (slot usage 'ru-nvcsw)
602 (slot usage 'ru-nivcsw))
605 (defvar *on-dangerous-wait* :warn)
607 ;;; Calling select in a bad place can hang in a nasty manner, so it's better
608 ;;; to have some way to detect these.
609 (defun note-dangerous-wait (type)
610 (let ((action *on-dangerous-wait*)
611 (*on-dangerous-wait* nil))
614 (warn "Starting a ~A without a timeout while interrupts are ~
618 (error "Starting a ~A without a timeout while interrupts are ~
623 "~&=== Starting a ~A without a timeout while interrupts are disabled. ===~%"
625 (sb!debug:backtrace)))
631 (define-alien-type nil
634 (events short) ; requested events
635 (revents short))) ; returned events
637 (defun unix-simple-poll (fd direction to-msec)
638 (declare (fixnum fd to-msec))
639 (when (and (minusp to-msec) (not *interrupts-enabled*))
640 (note-dangerous-wait "poll(2)"))
641 (let ((events (ecase direction
642 (:input (logior pollin pollpri))
644 (with-alien ((fds (struct pollfd)))
645 (with-restarted-syscall (count errno)
647 (setf (slot fds 'fd) fd
648 (slot fds 'events) events
649 (slot fds 'revents) 0)
650 (int-syscall ("poll" (* (struct pollfd)) int int)
651 (addr fds) 1 to-msec))
653 (let ((revents (slot fds 'revents)))
654 (or (and (eql 1 count) (logtest events revents))
655 (logtest pollhup revents)))
656 (error "Syscall poll(2) failed: ~A" (strerror))))))))
660 (defmacro with-fd-setsize ((n) &body body)
661 `(let ((,n (if (< 0 ,n fd-setsize)
663 (error "Cannot select(2) on ~D: above FD_SETSIZE limit."
664 (1- num-descriptors)))))
665 (declare (type (integer 0 #.fd-setsize) ,n))
668 ;;;; FIXME: Why have both UNIX-SELECT and UNIX-FAST-SELECT?
670 ;;; Perform the UNIX select(2) system call.
671 (declaim (inline unix-fast-select))
672 (defun unix-fast-select (num-descriptors
673 read-fds write-fds exception-fds
674 timeout-secs timeout-usecs)
675 (declare (type integer num-descriptors)
676 (type (or (alien (* (struct fd-set))) null)
677 read-fds write-fds exception-fds)
678 (type (or null (unsigned-byte 31)) timeout-secs timeout-usecs))
679 (with-fd-setsize (num-descriptors)
680 (flet ((select (tv-sap)
681 (int-syscall ("select" int (* (struct fd-set)) (* (struct fd-set))
682 (* (struct fd-set)) (* (struct timeval)))
683 num-descriptors read-fds write-fds exception-fds
685 (cond ((or timeout-secs timeout-usecs)
686 (with-alien ((tv (struct timeval)))
687 (setf (slot tv 'tv-sec) (or timeout-secs 0))
688 (setf (slot tv 'tv-usec) (or timeout-usecs 0))
689 (select (alien-sap (addr tv)))))
691 (unless *interrupts-enabled*
692 (note-dangerous-wait "select(2)"))
693 (select (int-sap 0)))))))
695 ;;; UNIX-SELECT accepts sets of file descriptors and waits for an event
696 ;;; to happen on one of them or to time out.
697 (defmacro num-to-fd-set (fdset num)
700 (setf (deref (slot ,fdset 'fds-bits) 0) ,num)
701 ,@(loop for index upfrom 1 below (/ fd-setsize
702 sb!vm:n-machine-word-bits)
703 collect `(setf (deref (slot ,fdset 'fds-bits) ,index) 0)))
705 ,@(loop for index upfrom 0 below (/ fd-setsize
706 sb!vm:n-machine-word-bits)
707 collect `(setf (deref (slot ,fdset 'fds-bits) ,index)
708 (ldb (byte sb!vm:n-machine-word-bits
709 ,(* index sb!vm:n-machine-word-bits))
712 (defmacro fd-set-to-num (nfds fdset)
713 `(if (<= ,nfds sb!vm:n-machine-word-bits)
714 (deref (slot ,fdset 'fds-bits) 0)
715 (+ ,@(loop for index upfrom 0 below (/ fd-setsize
716 sb!vm:n-machine-word-bits)
717 collect `(ash (deref (slot ,fdset 'fds-bits) ,index)
718 ,(* index sb!vm:n-machine-word-bits))))))
720 ;;; Examine the sets of descriptors passed as arguments to see whether
721 ;;; they are ready for reading and writing. See the UNIX Programmer's
722 ;;; Manual for more information.
723 (defun unix-select (nfds rdfds wrfds xpfds to-secs &optional (to-usecs 0))
724 (declare (type integer nfds)
725 (type unsigned-byte rdfds wrfds xpfds)
726 (type (or (unsigned-byte 31) null) to-secs)
727 (type (unsigned-byte 31) to-usecs)
728 (optimize (speed 3) (safety 0) (inhibit-warnings 3)))
729 (with-fd-setsize (nfds)
730 (with-alien ((tv (struct timeval))
731 (rdf (struct fd-set))
732 (wrf (struct fd-set))
733 (xpf (struct fd-set)))
735 (setf (slot tv 'tv-sec) to-secs
736 (slot tv 'tv-usec) to-usecs))
737 ((not *interrupts-enabled*)
738 (note-dangerous-wait "select(2)")))
739 (num-to-fd-set rdf rdfds)
740 (num-to-fd-set wrf wrfds)
741 (num-to-fd-set xpf xpfds)
742 (macrolet ((frob (lispvar alienvar)
743 `(if (zerop ,lispvar)
745 (alien-sap (addr ,alienvar)))))
746 (syscall ("select" int (* (struct fd-set)) (* (struct fd-set))
747 (* (struct fd-set)) (* (struct timeval)))
749 (fd-set-to-num nfds rdf)
750 (fd-set-to-num nfds wrf)
751 (fd-set-to-num nfds xpf))
752 nfds (frob rdfds rdf) (frob wrfds wrf) (frob xpfds xpf)
753 (if to-secs (alien-sap (addr tv)) (int-sap 0)))))))
755 ;;; Lisp-side implmentations of FD_FOO macros. Abandon all hope who enters
758 (defmacro fd-set (offset fd-set)
759 (with-unique-names (word bit)
760 `(multiple-value-bind (,word ,bit) (floor ,offset
761 sb!vm:n-machine-word-bits)
762 (setf (deref (slot ,fd-set 'fds-bits) ,word)
763 (logior (truly-the (unsigned-byte #.sb!vm:n-machine-word-bits)
765 (deref (slot ,fd-set 'fds-bits) ,word))))))
767 (defmacro fd-clr (offset fd-set)
768 (with-unique-names (word bit)
769 `(multiple-value-bind (,word ,bit) (floor ,offset
770 sb!vm:n-machine-word-bits)
771 (setf (deref (slot ,fd-set 'fds-bits) ,word)
772 (logand (deref (slot ,fd-set 'fds-bits) ,word)
773 (sb!kernel:word-logical-not
774 (truly-the (unsigned-byte #.sb!vm:n-machine-word-bits)
777 (defmacro fd-isset (offset fd-set)
778 (with-unique-names (word bit)
779 `(multiple-value-bind (,word ,bit) (floor ,offset
780 sb!vm:n-machine-word-bits)
781 (logbitp ,bit (deref (slot ,fd-set 'fds-bits) ,word)))))
783 (defmacro fd-zero (fd-set)
785 ,@(loop for index upfrom 0 below (/ fd-setsize sb!vm:n-machine-word-bits)
786 collect `(setf (deref (slot ,fd-set 'fds-bits) ,index) 0))))
789 (defun unix-simple-poll (fd direction to-msec)
790 (multiple-value-bind (to-sec to-usec)
793 (multiple-value-bind (to-sec to-msec2) (truncate to-msec 1000)
794 (values to-sec (* to-msec2 1000))))
795 (sb!unix:with-restarted-syscall (count errno)
796 (sb!alien:with-alien ((fds (sb!alien:struct sb!unix:fd-set)))
797 (sb!unix:fd-zero fds)
798 (sb!unix:fd-set fd fds)
799 (multiple-value-bind (read-fds write-fds)
802 (values (addr fds) nil))
804 (values nil (addr fds))))
805 (sb!unix:unix-fast-select (1+ fd)
806 read-fds write-fds nil
812 (error "Syscall select(2) failed on fd ~D: ~A" fd (strerror)))))))
816 ;;; This is a structure defined in src/runtime/wrap.c, to look
817 ;;; basically like "struct stat" according to stat(2). It may not
818 ;;; actually correspond to the real in-memory stat structure that the
819 ;;; syscall uses, and that's OK. Linux in particular is packed full of
820 ;;; stat macros, and trying to keep Lisp code in correspondence with
821 ;;; it is more pain than it's worth, so we just let our C runtime
822 ;;; synthesize a nice consistent structure for us.
824 ;;; Note that st-dev is a long, not a dev-t. This is because dev-t on
825 ;;; linux 32 bit archs is a 64 bit quantity, but alien doesn't support
826 ;;; those. We don't actually access that field anywhere, though, so
827 ;;; until we can get 64 bit alien support it'll do. Also note that
828 ;;; st_size is a long, not an off-t, because off-t is a 64-bit
829 ;;; quantity on Alpha. And FIXME: "No one would want a file length
830 ;;; longer than 32 bits anyway, right?":-|
832 ;;; The comment about alien and 64-bit quantities has not been kept in
833 ;;; sync with the comment now in wrap.h (formerly wrap.c), but it's
834 ;;; not clear whether either comment is correct. -- RMK 2007-11-14.
835 (define-alien-type nil
840 (st-nlink wst-nlink-t)
845 (st-blksize wst-blksize-t)
846 (st-blocks wst-blkcnt-t)
851 ;;; shared C-struct-to-multiple-VALUES conversion for the stat(2)
852 ;;; family of Unix system calls
854 ;;; FIXME: I think this should probably not be INLINE. However, when
855 ;;; this was not inline, it seemed to cause memory corruption
856 ;;; problems. My first guess is that it's a bug in the FFI code, where
857 ;;; the WITH-ALIEN expansion doesn't deal well with being wrapped
858 ;;; around a call to a function returning >10 values. But I didn't try
859 ;;; to figure it out, just inlined it as a quick fix. Perhaps someone
860 ;;; who's motivated to debug the FFI code can go over the DISASSEMBLE
861 ;;; output in the not-inlined case and see whether there's a problem,
862 ;;; and maybe even find a fix..
863 (declaim (inline %extract-stat-results))
864 (defun %extract-stat-results (wrapped-stat)
865 (declare (type (alien (* (struct wrapped_stat))) wrapped-stat))
867 (slot wrapped-stat 'st-dev)
868 (slot wrapped-stat 'st-ino)
869 (slot wrapped-stat 'st-mode)
870 (slot wrapped-stat 'st-nlink)
871 (slot wrapped-stat 'st-uid)
872 (slot wrapped-stat 'st-gid)
873 (slot wrapped-stat 'st-rdev)
874 (slot wrapped-stat 'st-size)
875 (slot wrapped-stat 'st-atime)
876 (slot wrapped-stat 'st-mtime)
877 (slot wrapped-stat 'st-ctime)
878 (slot wrapped-stat 'st-blksize)
879 (slot wrapped-stat 'st-blocks)))
881 ;;; Unix system calls in the stat(2) family are handled by calls to
882 ;;; C-level wrapper functions which copy all the raw "struct stat"
883 ;;; slots into the system-independent wrapped_stat format.
884 ;;; stat(2) <-> stat_wrapper()
885 ;;; fstat(2) <-> fstat_wrapper()
886 ;;; lstat(2) <-> lstat_wrapper()
887 (defun unix-stat (name)
888 (declare (type unix-pathname name))
889 (with-alien ((buf (struct wrapped_stat)))
890 (syscall ("stat_wrapper" c-string (* (struct wrapped_stat)))
891 (%extract-stat-results (addr buf))
893 (defun unix-lstat (name)
894 (declare (type unix-pathname name))
895 (with-alien ((buf (struct wrapped_stat)))
896 (syscall ("lstat_wrapper" c-string (* (struct wrapped_stat)))
897 (%extract-stat-results (addr buf))
899 (defun unix-fstat (fd)
900 (declare (type unix-fd fd))
901 (with-alien ((buf (struct wrapped_stat)))
902 (syscall ("fstat_wrapper" int (* (struct wrapped_stat)))
903 (%extract-stat-results (addr buf))
908 (declare (type unix-fd fd))
911 (or (with-alien ((buf (struct wrapped_stat)))
912 (syscall ("fstat_wrapper" int (* (struct wrapped_stat)))
916 (cond ((logtest sb!unix:s-ififo fmt)
918 ((logtest sb!unix:s-ifchr fmt)
920 ((logtest sb!unix:s-ifdir fmt)
922 ((logtest sb!unix:s-ifblk fmt)
924 ((logtest sb!unix:s-ifreg fmt)
926 ((logtest sb!unix:s-ifsock fmt)
933 ;; the POSIX.4 structure for a time value. This is like a "struct
934 ;; timeval" but has nanoseconds instead of microseconds.
935 #!-(or openbsd netbsd)
936 (define-alien-type nil
938 (tv-sec long) ; seconds
939 (tv-nsec long))) ; nanoseconds
941 ;; Just as with struct timeval, 64-bit OpenBSD has problems with the
942 ;; above definition. tv_sec is declared as time_t instead of long,
943 ;; and time_t is a typedef for int.
944 #!+(or openbsd netbsd)
945 (define-alien-type nil
947 (tv-sec time-t) ; seconds
948 (tv-nsec long))) ; nanoseconds
950 ;; used by other time functions
951 (define-alien-type nil
953 (tm-sec int) ; Seconds. [0-60] (1 leap second)
954 (tm-min int) ; Minutes. [0-59]
955 (tm-hour int) ; Hours. [0-23]
956 (tm-mday int) ; Day. [1-31]
957 (tm-mon int) ; Month. [0-11]
958 (tm-year int) ; Year - 1900.
959 (tm-wday int) ; Day of week. [0-6]
960 (tm-yday int) ; Days in year. [0-365]
961 (tm-isdst int) ; DST. [-1/0/1]
962 (tm-gmtoff long) ; Seconds east of UTC.
963 (tm-zone c-string))) ; Timezone abbreviation.
965 (define-alien-routine get-timezone sb!alien:void
967 (seconds-west sb!alien:int :out)
968 (daylight-savings-p sb!alien:boolean :out))
971 (defun nanosleep (secs nsecs)
972 (with-alien ((req (struct timespec))
973 (rem (struct timespec)))
974 (setf (slot req 'tv-sec) secs
975 (slot req 'tv-nsec) nsecs)
976 (loop while (and (eql sb!unix:eintr
978 (int-syscall ("nanosleep" (* (struct timespec))
979 (* (struct timespec)))
980 (addr req) (addr rem))))
981 ;; KLUDGE: On Darwin, if an interrupt cases nanosleep to
982 ;; take longer than the requested time, the call will
983 ;; return with EINT and (unsigned)-1 seconds in the
984 ;; remainder timespec, which would cause us to enter
985 ;; nanosleep again for ~136 years. So, we check that the
986 ;; remainder time is actually decreasing.
988 ;; It would be neat to do this bit of defensive
989 ;; programming on all platforms, but unfortunately on
990 ;; Linux, REM can be a little higher than REQ if the
991 ;; nanosleep() call is interrupted quickly enough,
992 ;; probably due to the request being rounded up to the
993 ;; nearest HZ. This would cause the sleep to return way
996 (let ((rem-sec (slot rem 'tv-sec))
997 (rem-nsec (slot rem 'tv-nsec)))
998 (when (or (> secs rem-sec)
999 (and (= secs rem-sec) (>= nsecs rem-nsec)))
1000 ;; Update for next round.
1004 do (setf (slot req 'tv-sec) (slot rem 'tv-sec)
1005 (slot req 'tv-nsec) (slot rem 'tv-nsec)))))
1007 (defun unix-get-seconds-west (secs)
1008 (multiple-value-bind (ignore seconds dst) (get-timezone secs)
1009 (declare (ignore ignore) (ignore dst))
1014 ;;; Structure crudely representing a timezone. KLUDGE: This is
1015 ;;; obsolete and should never be used.
1016 (define-alien-type nil
1018 (tz-minuteswest int) ; minutes west of Greenwich
1019 (tz-dsttime int))) ; type of dst correction
1022 ;; Type of the second argument to `getitimer' and
1023 ;; the second and third arguments `setitimer'.
1024 (define-alien-type nil
1026 (it-interval (struct timeval)) ; timer interval
1027 (it-value (struct timeval)))) ; current value
1029 (defconstant itimer-real 0)
1030 (defconstant itimer-virtual 1)
1031 (defconstant itimer-prof 2)
1034 (defun unix-getitimer (which)
1035 "Unix-getitimer returns the INTERVAL and VALUE slots of one of
1036 three system timers (:real :virtual or :profile). On success,
1037 unix-getitimer returns 5 values,
1038 T, it-interval-secs, it-interval-usec, it-value-secs, it-value-usec."
1039 (declare (type (member :real :virtual :profile) which)
1041 (unsigned-byte 29) (mod 1000000)
1042 (unsigned-byte 29) (mod 1000000)))
1043 (let ((which (ecase which
1045 (:virtual itimer-virtual)
1046 (:profile itimer-prof))))
1047 (with-alien ((itv (struct itimerval)))
1048 (syscall* ("getitimer" int (* (struct itimerval)))
1050 (slot (slot itv 'it-interval) 'tv-sec)
1051 (slot (slot itv 'it-interval) 'tv-usec)
1052 (slot (slot itv 'it-value) 'tv-sec)
1053 (slot (slot itv 'it-value) 'tv-usec))
1054 which (alien-sap (addr itv))))))
1057 (defun unix-setitimer (which int-secs int-usec val-secs val-usec)
1058 " Unix-setitimer sets the INTERVAL and VALUE slots of one of
1059 three system timers (:real :virtual or :profile). A SIGALRM signal
1060 will be delivered VALUE <seconds+microseconds> from now. INTERVAL,
1061 when non-zero, is <seconds+microseconds> to be loaded each time
1062 the timer expires. Setting INTERVAL and VALUE to zero disables
1063 the timer. See the Unix man page for more details. On success,
1064 unix-setitimer returns the old contents of the INTERVAL and VALUE
1065 slots as in unix-getitimer."
1066 (declare (type (member :real :virtual :profile) which)
1067 (type (unsigned-byte 29) int-secs val-secs)
1068 (type (integer 0 (1000000)) int-usec val-usec)
1070 (unsigned-byte 29) (mod 1000000)
1071 (unsigned-byte 29) (mod 1000000)))
1072 (let ((which (ecase which
1074 (:virtual itimer-virtual)
1075 (:profile itimer-prof))))
1076 (with-alien ((itvn (struct itimerval))
1077 (itvo (struct itimerval)))
1078 (setf (slot (slot itvn 'it-interval) 'tv-sec ) int-secs
1079 (slot (slot itvn 'it-interval) 'tv-usec) int-usec
1080 (slot (slot itvn 'it-value ) 'tv-sec ) val-secs
1081 (slot (slot itvn 'it-value ) 'tv-usec) val-usec)
1082 (syscall* ("setitimer" int (* (struct timeval))(* (struct timeval)))
1084 (slot (slot itvo 'it-interval) 'tv-sec)
1085 (slot (slot itvo 'it-interval) 'tv-usec)
1086 (slot (slot itvo 'it-value) 'tv-sec)
1087 (slot (slot itvo 'it-value) 'tv-usec))
1088 which (alien-sap (addr itvn))(alien-sap (addr itvo))))))
1091 ;;; FIXME: Many Unix error code definitions were deleted from the old
1092 ;;; CMU CL source code here, but not in the exports of SB-UNIX. I
1093 ;;; (WHN) hope that someday I'll figure out an automatic way to detect
1094 ;;; unused symbols in package exports, but if I don't, there are
1095 ;;; enough of them all in one place here that they should probably be
1096 ;;; removed by hand.
1098 (defconstant micro-seconds-per-internal-time-unit
1099 (/ 1000000 sb!xc:internal-time-units-per-second))
1101 ;;; UNIX specific code, that has been cleanly separated from the
1106 #!-sb-fluid (declaim (inline get-time-of-day))
1107 (defun get-time-of-day ()
1108 "Return the number of seconds and microseconds since the beginning of
1109 the UNIX epoch (January 1st 1970.)"
1111 (with-alien ((tv (struct timeval)))
1112 ;; CLH: FIXME! This seems to be a MacOS bug, but on x86-64/darwin,
1113 ;; gettimeofday occasionally fails. passing in a null pointer for the
1114 ;; timezone struct seems to work around the problem. NS notes: Darwin
1115 ;; manpage says the timezone is not used anymore in their implementation
1117 (syscall* ("gettimeofday" (* (struct timeval))
1118 (* (struct timezone)))
1119 (values (slot tv 'tv-sec)
1123 #!-(and x86-64 darwin)
1124 (with-alien ((tv (struct timeval))
1125 (tz (struct timezone)))
1126 (syscall* ("gettimeofday" (* (struct timeval))
1127 (* (struct timezone)))
1128 (values (slot tv 'tv-sec)
1133 (declaim (inline system-internal-run-time
1134 system-real-time-values))
1136 (defun system-real-time-values ()
1137 (multiple-value-bind (sec usec) (get-time-of-day)
1138 (declare (type (unsigned-byte 32) sec usec))
1139 (values sec (truncate usec micro-seconds-per-internal-time-unit))))
1141 ;; There are two optimizations here that actually matter (on 32-bit
1142 ;; systems): substract the epoch from seconds and milliseconds
1143 ;; separately, as those should remain fixnums for the first 17 years
1144 ;; or so of runtime. Also, avoid doing consing a new bignum if the
1145 ;; result would be = to the last result given.
1147 ;; Note: the next trick would be to spin a separate thread to update
1148 ;; a global value once per internal tick, so each individual call to
1149 ;; get-internal-real-time would be just a memory read... but that is
1150 ;; probably best left for user-level code. ;)
1152 ;; Thanks to James Anderson for the optimization hint.
1154 ;; Yes, it is possible to a computation to be GET-INTERNAL-REAL-TIME
1163 (declare (type (unsigned-byte 32) e-sec c-sec)
1164 (type fixnum e-msec c-msec)
1165 (type unsigned-byte now))
1166 (defun reinit-internal-real-time ()
1167 (setf (values e-sec e-msec) (system-real-time-values)
1170 ;; If two threads call this at the same time, we're still safe, I
1171 ;; believe, as long as NOW is updated before either of C-MSEC or
1172 ;; C-SEC. Same applies to interrupts. --NS
1174 ;; I believe this is almost correct with x86/x86-64 cache
1175 ;; coherency, but if the new value of C-SEC, C-MSEC can become
1176 ;; visible to another CPU without NOW doing the same then it's
1177 ;; unsafe. It's `almost' correct on x86 because writes by other
1178 ;; processors may become visible in any order provided transitity
1179 ;; holds. With at least three cpus, C-MSEC and C-SEC may be from
1180 ;; different threads and an incorrect value may be returned.
1181 ;; Considering that this failure is not detectable by the caller -
1182 ;; it looks like time passes a bit slowly - and that it should be
1183 ;; an extremely rare occurance I'm inclinded to leave it as it is.
1185 (defun get-internal-real-time ()
1186 (multiple-value-bind (sec msec) (system-real-time-values)
1187 (unless (and (= msec c-msec) (= sec c-sec))
1188 (setf now (+ (* (- sec e-sec)
1189 sb!xc:internal-time-units-per-second)
1195 (defun system-internal-run-time ()
1196 (multiple-value-bind (ignore utime-sec utime-usec stime-sec stime-usec)
1197 (unix-fast-getrusage rusage_self)
1198 (declare (ignore ignore)
1199 (type (unsigned-byte 31) utime-sec stime-sec)
1200 ;; (Classic CMU CL had these (MOD 1000000) instead, but
1201 ;; at least in Linux 2.2.12, the type doesn't seem to
1202 ;; be documented anywhere and the observed behavior is
1203 ;; to sometimes return 1000000 exactly.)
1204 (type (integer 0 1000000) utime-usec stime-usec))
1205 (let ((result (+ (* (+ utime-sec stime-sec)
1206 sb!xc:internal-time-units-per-second)
1207 (floor (+ utime-usec
1209 (floor micro-seconds-per-internal-time-unit 2))
1210 micro-seconds-per-internal-time-unit))))
1213 ;;; FIXME, KLUDGE: GET-TIME-OF-DAY used to be UNIX-GETTIMEOFDAY, and had a
1214 ;;; primary return value indicating sucess, and also returned timezone
1215 ;;; information -- though the timezone data was not there on Darwin.
1216 ;;; Now we have GET-TIME-OF-DAY, but it turns out that despite SB-UNIX being
1217 ;;; an implementation package UNIX-GETTIMEOFDAY has users in the wild.
1218 ;;; So we're stuck with it for a while -- maybe delete it towards the end
1220 (defun unix-gettimeofday ()
1221 (multiple-value-bind (sec usec) (get-time-of-day)
1222 (values t sec usec nil nil)))
1224 ;;;; opendir, readdir, closedir, and dirent-name
1226 (declaim (inline unix-opendir))
1227 (defun unix-opendir (namestring &optional (errorp t))
1228 (let ((dir (alien-funcall
1229 (extern-alien "sb_opendir"
1230 (function system-area-pointer c-string))
1232 (if (zerop (sap-int dir))
1233 (when errorp (simple-perror
1234 (format nil "Error opening directory ~S"
1238 (declaim (inline unix-readdir))
1239 (defun unix-readdir (dir &optional (errorp t) namestring)
1240 (let ((ent (alien-funcall
1241 (extern-alien "sb_readdir"
1242 (function system-area-pointer system-area-pointer))
1244 (if (zerop (sap-int ent))
1245 (when errorp (simple-perror
1246 (format nil "Error reading directory entry~@[ from ~S~]"
1250 (declaim (inline unix-closedir))
1251 (defun unix-closedir (dir &optional (errorp t) namestring)
1252 (let ((r (alien-funcall
1253 (extern-alien "sb_closedir" (function int system-area-pointer))
1256 (when errorp (simple-perror
1257 (format nil "Error closing directory~@[ ~S~]"
1261 (declaim (inline unix-dirent-name))
1262 (defun unix-dirent-name (ent)
1264 (extern-alien "sb_dirent_name" (function c-string system-area-pointer))
1267 ;;;; A magic constant for wait3().
1269 ;;;; FIXME: This used to be defined in run-program.lisp as
1270 ;;;; (defconstant wait-wstopped #-svr4 #o177 #+svr4 wait-wuntraced)
1271 ;;;; According to some of the man pages, the #o177 is part of the API
1272 ;;;; for wait3(); that said, under SunOS there is a WSTOPPED thing in
1273 ;;;; the headers that may or may not be the same thing. To be
1274 ;;;; investigated. -- CSR, 2002-03-25
1275 (defconstant wstopped #o177)