1 ;;;; RUN-PROGRAM and friends, a facility for running Unix programs
4 ;;;; This software is part of the SBCL system. See the README file for
7 ;;;; This software is derived from the CMU CL system, which was
8 ;;;; written at Carnegie Mellon University and released into the
9 ;;;; public domain. The software is in the public domain and is
10 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
11 ;;;; files for more information.
13 (in-package "SB-IMPL")
15 ;;;; hacking the Unix environment
17 ;;;; In the original CMU CL code that LOAD-FOREIGN is derived from, the
18 ;;;; Unix environment (as in "man environ") was represented as an
19 ;;;; alist from keywords to strings, so that e.g. the Unix environment
20 ;;;; "SHELL=/bin/bash" "HOME=/root" "PAGER=less"
21 ;;;; was represented as
22 ;;;; ((:SHELL . "/bin/bash") (:HOME . "/root") (:PAGER "less"))
23 ;;;; This had a few problems in principle: the mapping into
24 ;;;; keyword symbols smashed the case of environment
25 ;;;; variables, and the whole mapping depended on the presence of
26 ;;;; #\= characters in the environment strings. In practice these
27 ;;;; problems weren't hugely important, since conventionally environment
28 ;;;; variables are uppercase strings followed by #\= followed by
29 ;;;; arbitrary data. However, since it's so manifestly not The Right
30 ;;;; Thing to make code which breaks unnecessarily on input which
31 ;;;; doesn't follow what is, after all, only a tradition, we've switched
32 ;;;; formats in SBCL, so that the fundamental environment list
33 ;;;; is just a list of strings, with a one-to-one-correspondence
34 ;;;; to the C-level representation. I.e., in the example above,
35 ;;;; the SBCL representation is
36 ;;;; '("SHELL=/bin/bash" "HOME=/root" "PAGER=less")
37 ;;;; CMU CL's implementation is currently supported to help with porting.
39 ;;;; It's not obvious that this code belongs here (instead of e.g. in
40 ;;;; unix.lisp), since it has only a weak logical connection with
41 ;;;; RUN-PROGRAM. However, physically it's convenient to put it here.
42 ;;;; It's not needed at cold init, so we *can* put it in this
43 ;;;; warm-loaded file. And by putting it in this warm-loaded file, we
44 ;;;; make it easy for it to get to the C-level 'environ' variable.
45 ;;;; which (at least in sbcl-0.6.10 on Red Hat Linux 6.2) is not
46 ;;;; visible at GENESIS time.
48 (def-alien-variable "environ" (* c-string))
50 (defun posix-environ ()
51 "Return the Unix environment (\"man environ\") as a list of SIMPLE-STRINGs."
52 (c-strings->string-list environ))
54 ;;; Convert as best we can from a SBCL representation of a Unix
55 ;;; environment to a CMU CL representation.
57 ;;; * (UNIX-ENVIRONMENT-CMUCL-FROM-SBCL '("Bletch=fub" "Noggin" "YES=No!"))
59 ;;; smashing case of "Bletch=fub" in conversion to CMU-CL-style
62 ;;; no #\= in "Noggin", eliding it in CMU-CL-style environment alist
63 ;;; ((:BLETCH . "fub") (:YES . "No!"))
64 (defun unix-environment-cmucl-from-sbcl (sbcl)
67 (declare (type simple-string string))
68 (let ((=-pos (position #\= string :test #'equal)))
71 (let* ((key-as-string (subseq string 0 =-pos))
72 (key-as-upcase-string (string-upcase key-as-string))
73 (key (keywordicate key-as-upcase-string))
74 (val (subseq string (1+ =-pos))))
75 (unless (string= key-as-string key-as-upcase-string)
76 (warn "smashing case of ~S in conversion to CMU-CL-style ~
80 (warn "no #\\= in ~S, eliding it in CMU-CL-style environment alist"
84 ;;; Convert from a CMU CL representation of a Unix environment to a
85 ;;; SBCL representation.
86 (defun unix-environment-sbcl-from-cmucl (cmucl)
89 (destructuring-bind (key . val) cons
90 (declare (type keyword key) (type simple-string val))
91 (concatenate 'simple-string (symbol-name key) "=" val)))
94 ;;;; Import wait3(2) from Unix.
96 (sb-alien:def-alien-routine ("wait3" c-wait3) sb-c-call:int
97 (status sb-c-call:int :out)
98 (options sb-c-call:int)
99 (rusage sb-c-call:int))
101 (defconstant wait-wnohang #-svr4 1 #+svr4 #o100)
102 (defconstant wait-wuntraced #-svr4 2 #+svr4 4)
103 (defconstant wait-wstopped #-svr4 #o177 #+svr4 wait-wuntraced)
105 (defun wait3 (&optional do-not-hang check-for-stopped)
106 "Return any available status information on child process. "
107 (multiple-value-bind (pid status)
108 (c-wait3 (logior (if do-not-hang
111 (if check-for-stopped
115 (cond ((or (minusp pid)
118 ((eql (ldb (byte 8 0) status)
122 (ldb (byte 8 8) status)))
123 ((zerop (ldb (byte 7 0) status))
126 (ldb (byte 8 8) status)))
128 (let ((signal (ldb (byte 7 0) status)))
132 (sb-unix:unix-signal-number :sigstop)
133 (sb-unix:unix-signal-number :sigtstp)
134 (sb-unix:unix-signal-number :sigttin)
135 (sb-unix:unix-signal-number :sigttou)))
139 (not (zerop (ldb (byte 1 7) status)))))))))
141 ;;;; process control stuff
143 (defvar *active-processes* nil
144 "List of process structures for all active processes.")
146 (defstruct (process (:copier nil))
147 pid ; PID of child process
148 %status ; either :RUNNING, :STOPPED, :EXITED, or :SIGNALED
149 exit-code ; either exit code or signal
150 core-dumped ; T if a core image was dumped
151 pty ; stream to child's pty, or NIL
152 input ; stream to child's input, or NIL
153 output ; stream from child's output, or NIL
154 error ; stream from child's error output, or NIL
155 status-hook ; closure to call when PROC changes status
156 plist ; a place for clients to stash things
157 cookie) ; list of the number of pipes from the subproc
159 (defmethod print-object ((process process) stream)
160 (print-unreadable-object (process stream :type t)
163 (process-pid process)
164 (process-status process)))
167 (defun process-status (proc)
168 "Return the current status of process. The result is one of :RUNNING,
169 :STOPPED, :EXITED, or :SIGNALED."
170 (get-processes-status-changes)
171 (process-%status proc))
173 (defun process-wait (proc &optional check-for-stopped)
174 "Wait for PROC to quit running for some reason. Returns PROC."
176 (case (process-status proc)
179 (when check-for-stopped
182 (when (zerop (car (process-cookie proc)))
184 (sb-sys:serve-all-events 1))
188 ;;; Find the current foreground process group id.
189 (defun find-current-foreground-process (proc)
190 (sb-alien:with-alien ((result sb-c-call:int))
193 (sb-unix:unix-ioctl (sb-sys:fd-stream-fd (process-pty proc))
195 (sb-alien:alien-sap (sb-alien:addr result)))
197 (error "TIOCPGRP ioctl failed: ~S" (strerror error)))
201 (defun process-kill (proc signal &optional (whom :pid))
202 "Hand SIGNAL to PROC. If WHOM is :PID, use the kill Unix system call. If
203 WHOM is :PROCESS-GROUP, use the killpg Unix system call. If WHOM is
204 :PTY-PROCESS-GROUP deliver the signal to whichever process group is
205 currently in the foreground."
206 (let ((pid (ecase whom
207 ((:pid :process-group)
211 (find-current-foreground-process proc)))))
217 (sb-unix:unix-ioctl (sb-sys:fd-stream-fd (process-pty proc))
220 (sb-unix:unix-signal-number signal))))
221 ((:process-group #-hpux :pty-process-group)
222 (sb-unix:unix-killpg pid signal))
224 (sb-unix:unix-kill pid signal)))
227 ((and (eql pid (process-pid proc))
228 (= (sb-unix:unix-signal-number signal)
229 (sb-unix:unix-signal-number :sigcont)))
230 (setf (process-%status proc) :running)
231 (setf (process-exit-code proc) nil)
232 (when (process-status-hook proc)
233 (funcall (process-status-hook proc) proc))
238 (defun process-alive-p (proc)
239 "Return T if the process is still alive, NIL otherwise."
240 (let ((status (process-status proc)))
241 (if (or (eq status :running)
242 (eq status :stopped))
246 (defun process-close (proc)
247 "Close all streams connected to PROC and stop maintaining the status slot."
248 (macrolet ((frob (stream abort)
249 `(when ,stream (close ,stream :abort ,abort))))
250 (frob (process-pty proc) t) ; Don't FLUSH-OUTPUT to dead process, ..
251 (frob (process-input proc) t) ; .. 'cause it will generate SIGPIPE.
252 (frob (process-output proc) nil)
253 (frob (process-error proc) nil))
254 (sb-sys:without-interrupts
255 (setf *active-processes* (delete proc *active-processes*)))
258 ;;; the handler for SIGCHLD signals that RUN-PROGRAM establishes
259 (defun sigchld-handler (ignore1 ignore2 ignore3)
260 (declare (ignore ignore1 ignore2 ignore3))
261 (get-processes-status-changes))
263 (defun get-processes-status-changes ()
265 (multiple-value-bind (pid what code core)
269 (let ((proc (find pid *active-processes* :key #'process-pid)))
271 (setf (process-%status proc) what)
272 (setf (process-exit-code proc) code)
273 (setf (process-core-dumped proc) core)
274 (when (process-status-hook proc)
275 (funcall (process-status-hook proc) proc))
276 (when (position what #(:exited :signaled))
277 (sb-sys:without-interrupts
278 (setf *active-processes*
279 (delete proc *active-processes*)))))))))
281 ;;;; RUN-PROGRAM and close friends
283 ;;; list of file descriptors to close when RUN-PROGRAM exits due to an error
284 (defvar *close-on-error* nil)
286 ;;; list of file descriptors to close when RUN-PROGRAM returns in the parent
287 (defvar *close-in-parent* nil)
289 ;;; list of handlers installed by RUN-PROGRAM
290 (defvar *handlers-installed* nil)
295 (sg-ispeed sb-c-call:char) ; input speed
296 (sg-ospeed sb-c-call:char) ; output speed
297 (sg-erase sb-c-call:char) ; erase character
298 (sg-kill sb-c-call:char) ; kill character
299 (sg-flags sb-c-call:short))) ; mode flags
303 (sg-four sb-c-call:int)
304 (sg-chars (array sb-c-call:char 4))
305 (sg-flags sb-c-call:int)))
307 ;;; Find an unused pty. Return three values: the file descriptor for
308 ;;; the master side of the pty, the file descriptor for the slave side
309 ;;; of the pty, and the name of the tty device for the slave side.
311 (dolist (char '(#\p #\q))
313 (let* ((master-name (format nil "/dev/pty~C~X" char digit))
314 (master-fd (sb-unix:unix-open master-name
318 (let* ((slave-name (format nil "/dev/tty~C~X" char digit))
319 (slave-fd (sb-unix:unix-open slave-name
323 ;; comment from classic CMU CL:
324 ;; Maybe put a vhangup here?
326 ;; FIXME: It seems as though this logic should be in
327 ;; OPEN-PTY, not FIND-A-PTY (both from the comments
328 ;; documenting DEFUN FIND-A-PTY, and from the
329 ;; connotations of the function names).
331 ;; FIXME: It would be nice to have a note, and/or a pointer
332 ;; to some reference material somewhere, explaining
333 ;; why we need this on *BSD and not on Linux.
335 (sb-alien:with-alien ((stuff (sb-alien:struct sgttyb)))
336 (let ((sap (sb-alien:alien-sap stuff)))
337 (sb-unix:unix-ioctl slave-fd sb-unix:TIOCGETP sap)
338 (setf (sb-alien:slot stuff 'sg-flags)
339 ;; This is EVENP|ODDP, the same numeric code
340 ;; both on FreeBSD and on OpenBSD. -- WHN 20000929
342 (sb-unix:unix-ioctl slave-fd sb-unix:TIOCSETP sap)
343 (sb-unix:unix-ioctl master-fd sb-unix:TIOCGETP sap)
344 (setf (sb-alien:slot stuff 'sg-flags)
345 (logand (sb-alien:slot stuff 'sg-flags)
346 ;; This is ~ECHO, the same numeric
347 ;; code both on FreeBSD and on OpenBSD.
350 (sb-unix:unix-ioctl master-fd sb-unix:TIOCSETP sap)))
351 (return-from find-a-pty
355 (sb-unix:unix-close master-fd))))))
356 (error "could not find a pty"))
358 (defun open-pty (pty cookie)
363 (push master *close-on-error*)
364 (push slave *close-in-parent*)
366 (multiple-value-bind (new-fd errno) (sb-unix:unix-dup master)
368 (error "couldn't SB-UNIX:UNIX-DUP ~D: ~A" master (strerror errno)))
369 (push new-fd *close-on-error*)
370 (copy-descriptor-to-stream new-fd pty cookie)))
372 (sb-sys:make-fd-stream master :input t :output t)))))
374 (defmacro round-bytes-to-words (n)
375 `(logand (the fixnum (+ (the fixnum ,n) 3)) (lognot 3)))
377 (defun string-list-to-c-strvec (string-list)
378 ;; Make a pass over STRING-LIST to calculate the amount of memory
379 ;; needed to hold the strvec.
380 (let ((string-bytes 0)
381 ;; We need an extra for the null, and an extra 'cause exect
382 ;; clobbers argv[-1].
383 (vec-bytes (* #-alpha 4 #+alpha 8 (+ (length string-list) 2))))
384 (declare (fixnum string-bytes vec-bytes))
385 (dolist (s string-list)
386 (enforce-type s simple-string)
387 (incf string-bytes (round-bytes-to-words (1+ (length s)))))
388 ;; Now allocate the memory and fill it in.
389 (let* ((total-bytes (+ string-bytes vec-bytes))
390 (vec-sap (sb-sys:allocate-system-memory total-bytes))
391 (string-sap (sap+ vec-sap vec-bytes))
392 (i #-alpha 4 #+alpha 8))
393 (declare (type (and unsigned-byte fixnum) total-bytes i)
394 (type sb-sys:system-area-pointer vec-sap string-sap))
395 (dolist (s string-list)
396 (declare (simple-string s))
397 (let ((n (length s)))
398 ;; Blast the string into place.
399 (sb-kernel:copy-to-system-area (the simple-string s)
400 (* sb-vm:vector-data-offset
403 (* (1+ n) sb-vm:byte-bits))
404 ;; Blast the pointer to the string into place.
405 (setf (sap-ref-sap vec-sap i) string-sap)
406 (setf string-sap (sap+ string-sap (round-bytes-to-words (1+ n))))
407 (incf i #-alpha 4 #+alpha 8)))
408 ;; Blast in the last null pointer.
409 (setf (sap-ref-sap vec-sap i) (int-sap 0))
410 (values vec-sap (sap+ vec-sap #-alpha 4 #+alpha 8) total-bytes))))
412 (defmacro with-c-strvec ((var str-list) &body body)
413 (let ((sap (gensym "SAP-"))
414 (size (gensym "SIZE-")))
415 `(multiple-value-bind
417 (string-list-to-c-strvec ,str-list)
421 (sb-sys:deallocate-system-memory ,sap ,size)))))
423 (sb-alien:def-alien-routine spawn sb-c-call:int
424 (program sb-c-call:c-string)
425 (argv (* sb-c-call:c-string))
426 (envp (* sb-c-call:c-string))
427 (pty-name sb-c-call:c-string)
428 (stdin sb-c-call:int)
429 (stdout sb-c-call:int)
430 (stderr sb-c-call:int))
432 ;;; FIXME: There shouldn't be two semiredundant versions of the
433 ;;; documentation. Since this is a public extension function, the
434 ;;; documentation should be in the doc string. So all information from
435 ;;; this comment should be merged into the doc string, and then this
436 ;;; comment can go away.
438 ;;; RUN-PROGRAM uses fork() and execve() to run a different program.
439 ;;; Strange stuff happens to keep the Unix state of the world
442 ;;; The child process needs to get its input from somewhere, and send
443 ;;; its output (both standard and error) to somewhere. We have to do
444 ;;; different things depending on where these somewheres really are.
446 ;;; For input, there are five options:
447 ;;; -- T: Just leave fd 0 alone. Pretty simple.
448 ;;; -- "file": Read from the file. We need to open the file and
449 ;;; pull the descriptor out of the stream. The parent should close
450 ;;; this stream after the child is up and running to free any
451 ;;; storage used in the parent.
452 ;;; -- NIL: Same as "file", but use "/dev/null" as the file.
453 ;;; -- :STREAM: Use Unix pipe() to create two descriptors. Use
454 ;;; SB-SYS:MAKE-FD-STREAM to create the output stream on the
455 ;;; writeable descriptor, and pass the readable descriptor to
456 ;;; the child. The parent must close the readable descriptor for
457 ;;; EOF to be passed up correctly.
458 ;;; -- a stream: If it's a fd-stream, just pull the descriptor out
459 ;;; of it. Otherwise make a pipe as in :STREAM, and copy
460 ;;; everything across.
462 ;;; For output, there are five options:
463 ;;; -- T: Leave descriptor 1 alone.
464 ;;; -- "file": dump output to the file.
465 ;;; -- NIL: dump output to /dev/null.
466 ;;; -- :STREAM: return a stream that can be read from.
467 ;;; -- a stream: if it's a fd-stream, use the descriptor in it.
468 ;;; Otherwise, copy stuff from output to stream.
470 ;;; For error, there are all the same options as output plus:
471 ;;; -- :OUTPUT: redirect to the same place as output.
473 ;;; RUN-PROGRAM returns a PROCESS structure for the process if
474 ;;; the fork worked, and NIL if it did not.
475 (defun run-program (program args
478 (environment (if env-p
479 (unix-environment-sbcl-from-cmucl env)
485 if-input-does-not-exist
487 (if-output-exists :error)
489 (if-error-exists :error)
491 "RUN-PROGRAM creates a new Unix process running the Unix program found in
492 the file specified by the PROGRAM argument. ARGS are the standard
493 arguments that can be passed to a Unix program. For no arguments, use NIL
494 (which means that just the name of the program is passed as arg 0).
496 RUN-PROGRAM will either return NIL or a PROCESS structure. See the CMU
497 Common Lisp Users Manual for details about the PROCESS structure.
499 notes about Unix environments (as in the :ENVIRONMENT and :ENV args):
500 1. The SBCL implementation of RUN-PROGRAM, like Perl and many other
501 programs, but unlike the original CMU CL implementation, copies
502 the Unix environment by default.
503 2. Running Unix programs from a setuid process, or in any other
504 situation where the Unix environment is under the control of someone
505 else, is a mother lode of security problems. If you are contemplating
506 doing this, read about it first. (The Perl community has a lot of good
507 documentation about this and other security issues in script-like
510 The &KEY arguments have the following meanings:
512 a list of SIMPLE-STRINGs describing the new Unix environment (as
513 in \"man environ\"). The default is to copy the environment of
516 an alternative lossy representation of the new Unix environment,
517 for compatibility with CMU CL
519 If non-NIL (default), wait until the created process finishes. If
520 NIL, continue running Lisp until the program finishes.
522 Either T, NIL, or a stream. Unless NIL, the subprocess is established
523 under a PTY. If :pty is a stream, all output to this pty is sent to
524 this stream, otherwise the PROCESS-PTY slot is filled in with a stream
525 connected to pty that can read output and write input.
527 Either T, NIL, a pathname, a stream, or :STREAM. If T, the standard
528 input for the current process is inherited. If NIL, /dev/null
529 is used. If a pathname, the file so specified is used. If a stream,
530 all the input is read from that stream and send to the subprocess. If
531 :STREAM, the PROCESS-INPUT slot is filled in with a stream that sends
532 its output to the process. Defaults to NIL.
533 :IF-INPUT-DOES-NOT-EXIST (when :INPUT is the name of a file)
535 :ERROR to generate an error
536 :CREATE to create an empty file
537 NIL (the default) to return NIL from RUN-PROGRAM
539 Either T, NIL, a pathname, a stream, or :STREAM. If T, the standard
540 output for the current process is inherited. If NIL, /dev/null
541 is used. If a pathname, the file so specified is used. If a stream,
542 all the output from the process is written to this stream. If
543 :STREAM, the PROCESS-OUTPUT slot is filled in with a stream that can
544 be read to get the output. Defaults to NIL.
545 :IF-OUTPUT-EXISTS (when :OUTPUT is the name of a file)
547 :ERROR (the default) to generate an error
548 :SUPERSEDE to supersede the file with output from the program
549 :APPEND to append output from the program to the file
550 NIL to return NIL from RUN-PROGRAM, without doing anything
551 :ERROR and :IF-ERROR-EXISTS
552 Same as :OUTPUT and :IF-OUTPUT-EXISTS, except that :ERROR can also be
553 specified as :OUTPUT in which case all error output is routed to the
554 same place as normal output.
556 This is a function the system calls whenever the status of the
557 process changes. The function takes the process as an argument."
559 (when (and env-p environment-p)
560 (error "can't specify :ENV and :ENVIRONMENT simultaneously"))
561 ;; Make sure that the interrupt handler is installed.
562 (sb-sys:enable-interrupt :sigchld #'sigchld-handler)
563 ;; Prepend the program to the argument list.
564 (push (namestring program) args)
565 (let (;; Clear various specials used by GET-DESCRIPTOR-FOR to
566 ;; communicate cleanup info.
570 ;; Establish PROC at this level so that we can return it.
572 ;; It's friendly to allow the caller to pass any string
573 ;; designator, but internally we'd like SIMPLE-STRINGs.
574 (simple-args (mapcar (lambda (x) (coerce x 'simple-string)) args)))
576 (let (;; FIXME: The old code here used to do
577 ;; (MERGE-PATHNAMES PROGRAM "path:"),
578 ;; which is the right idea (searching through the Unix
579 ;; PATH). Unfortunately, there is no logical pathname
580 ;; "path:" defined in sbcl-0.6.10. It would probably be
581 ;; reasonable to restore Unix PATH searching in SBCL, e.g.
582 ;; with a function FIND-EXECUTABLE-FILE-IN-POSIX-PATH.
583 ;; (I don't want to do it with search lists the way
584 ;; that CMU CL did, because those are a non-ANSI
585 ;; extension which I'd like to get rid of. -- WHN)
586 (pfile (unix-namestring program t t))
589 (error "no such program: ~S" program))
590 (multiple-value-bind (stdin input-stream)
591 (get-descriptor-for input cookie
593 :if-does-not-exist if-input-does-not-exist)
594 (multiple-value-bind (stdout output-stream)
595 (get-descriptor-for output cookie
597 :if-exists if-output-exists)
598 (multiple-value-bind (stderr error-stream)
599 (if (eq error :output)
600 (values stdout output-stream)
601 (get-descriptor-for error cookie
603 :if-exists if-error-exists))
604 (multiple-value-bind (pty-name pty-stream)
605 (open-pty pty cookie)
606 ;; Make sure we are not notified about the child
607 ;; death before we have installed the PROCESS
608 ;; structure in *ACTIVE-PROCESSES*.
609 (sb-sys:without-interrupts
610 (with-c-strvec (args-vec simple-args)
611 (with-c-strvec (environment-vec environment)
614 (spawn pfile args-vec environment-vec pty-name
615 stdin stdout stderr))))
616 (when (< child-pid 0)
617 (error "couldn't fork child process: ~A"
619 (setf proc (make-process :pid child-pid
623 :output output-stream
625 :status-hook status-hook
627 (push proc *active-processes*))))))))))
628 (dolist (fd *close-in-parent*)
629 (sb-unix:unix-close fd))
631 (dolist (fd *close-on-error*)
632 (sb-unix:unix-close fd))
633 (dolist (handler *handlers-installed*)
634 (sb-sys:remove-fd-handler handler))))
635 (when (and wait proc)
639 ;;; Install a handler for any input that shows up on the file
640 ;;; descriptor. The handler reads the data and writes it to the
642 (defun copy-descriptor-to-stream (descriptor stream cookie)
644 (let ((string (make-string 256))
647 (sb-sys:add-fd-handler
649 :input #'(lambda (fd)
650 (declare (ignore fd))
655 (result readable/errno)
656 (sb-unix:unix-select (1+ descriptor)
660 (error "~@<couldn't select on sub-process: ~
662 (strerror readable/errno)))
665 (sb-alien:with-alien ((buf (sb-alien:array
670 (sb-unix:unix-read descriptor
673 (cond ((or (and (null count)
674 (eql errno sb-unix:eio))
676 (sb-sys:remove-fd-handler handler)
679 (sb-unix:unix-close descriptor)
682 (sb-sys:remove-fd-handler handler)
686 "~@<couldn't read input from sub-process: ~
690 (sb-kernel:copy-from-system-area
692 string (* sb-vm:vector-data-offset
694 (* count sb-vm:byte-bits))
695 (write-string string stream
696 :end count)))))))))))
698 ;;; Find a file descriptor to use for object given the direction.
699 ;;; Returns the descriptor. If object is :STREAM, returns the created
700 ;;; stream as the second value.
701 (defun get-descriptor-for (object
707 ;; No new descriptor is needed.
713 (sb-unix:unix-open "/dev/null"
715 (:input sb-unix:o_rdonly)
716 (:output sb-unix:o_wronly)
720 (error "~@<couldn't open \"/dev/null\": ~2I~_~A~:>"
722 (push fd *close-in-parent*)
725 (multiple-value-bind (read-fd write-fd) (sb-unix:unix-pipe)
727 (error "couldn't create pipe: ~A" (strerror write-fd)))
730 (push read-fd *close-in-parent*)
731 (push write-fd *close-on-error*)
732 (let ((stream (sb-sys:make-fd-stream write-fd :output t)))
733 (values read-fd stream)))
735 (push read-fd *close-on-error*)
736 (push write-fd *close-in-parent*)
737 (let ((stream (sb-sys:make-fd-stream read-fd :input t)))
738 (values write-fd stream)))
740 (sb-unix:unix-close read-fd)
741 (sb-unix:unix-close write-fd)
742 (error "Direction must be either :INPUT or :OUTPUT, not ~S."
744 ((or (pathnamep object) (stringp object))
745 (with-open-stream (file (apply #'open object keys))
748 (sb-unix:unix-dup (sb-sys:fd-stream-fd file))
750 (push fd *close-in-parent*)
753 (error "couldn't duplicate file descriptor: ~A"
754 (strerror errno)))))))
755 ((sb-sys:fd-stream-p object)
756 (values (sb-sys:fd-stream-fd object) nil))
760 ;; FIXME: We could use a better way of setting up
761 ;; temporary files, both here and in LOAD-FOREIGN.
764 (error "could not open a temporary file in /tmp"))
765 (let* ((name (format nil "/tmp/.run-program-~D" count))
766 (fd (sb-unix:unix-open name
767 (logior sb-unix:o_rdwr
771 (sb-unix:unix-unlink name)
773 (let ((newline (string #\Newline)))
777 (read-line object nil nil)
780 (sb-unix:unix-write fd line 0 (length line))
783 (sb-unix:unix-write fd newline 0 1)))))
784 (sb-unix:unix-lseek fd 0 sb-unix:l_set)
785 (push fd *close-in-parent*)
786 (return (values fd nil))))))
788 (multiple-value-bind (read-fd write-fd)
791 (error "couldn't create pipe: ~S" (strerror write-fd)))
792 (copy-descriptor-to-stream read-fd object cookie)
793 (push read-fd *close-on-error*)
794 (push write-fd *close-in-parent*)
795 (values write-fd nil)))))
797 (error "invalid option to RUN-PROGRAM: ~S" object))))