Improve the lexical scoping in #'block, #'return-from. lisp/ChangeLog addition: 2011-02-07 Aidan Kehoe <kehoea@parhasard.net> * bytecomp.el: * bytecomp.el (byte-compile-initial-macro-environment): Shadow `block', `return-from' here, we implement them differently when byte-compiling. * bytecomp.el (byte-compile-active-blocks): New. * bytecomp.el (byte-compile-block-1): New. * bytecomp.el (byte-compile-return-from-1): New. * bytecomp.el (return-from-1): New. * bytecomp.el (block-1): New. These are two aliases that exist to have their own associated byte-compile functions, which functions implement `block' and `return-from'. * cl-extra.el (cl-macroexpand-all): Fix a bug here when macros in the environment have been compiled. * cl-macs.el (block): * cl-macs.el (return): * cl-macs.el (return-from): Be more careful about lexical scope in these macros. * cl.el: * cl.el ('cl-block-wrapper): Removed. * cl.el ('cl-block-throw): Removed. These aren't needed in code generated by this XEmacs. They shouldn't be needed in code generated by XEmacs 21.4, but if it turns out the packages do need them, we can put them back. 2011-01-30 Mike Sperber <mike@xemacs.org> * font-lock.el (font-lock-fontify-pending-extents): Don't fail if `font-lock-mode' is unset, which can happen in the middle of `revert-buffer'. 2011-01-23 Aidan Kehoe <kehoea@parhasard.net> * cl-macs.el (delete): * cl-macs.el (delq): * cl-macs.el (remove): * cl-macs.el (remq): Don't use the compiler macro if these functions were given the wrong number of arguments, as happens in lisp-tests.el. * cl-seq.el (remove, remq): Removed. I added these to subr.el, and forgot to remove them from here. 2011-01-22 Aidan Kehoe <kehoea@parhasard.net> * bytecomp.el (byte-compile-setq, byte-compile-set): Remove kludge allowing keywords' values to be set, all the code that does that is gone. * cl-compat.el (elt-satisfies-test-p): * faces.el (set-face-parent): * faces.el (face-doc-string): * gtk-font-menu.el: * gtk-font-menu.el (gtk-reset-device-font-menus): * msw-font-menu.el: * msw-font-menu.el (mswindows-reset-device-font-menus): * package-get.el (package-get-installedp): * select.el (select-convert-from-image-data): * sound.el: * sound.el (load-sound-file): * x-font-menu.el (x-reset-device-font-menus-core): Don't quote keywords, they're self-quoting, and the win from backward-compatibility is sufficiently small now that the style problem overrides it. 2011-01-22 Aidan Kehoe <kehoea@parhasard.net> * cl-macs.el (block, return-from): Require that NAME be a symbol in these macros, as always documented in the #'block docstring and as required by Common Lisp. * descr-text.el (unidata-initialize-unihan-database): Correct the use of non-symbols in #'block and #'return-from in this function. 2011-01-15 Aidan Kehoe <kehoea@parhasard.net> * cl-extra.el (concatenate): Accept more complicated TYPEs in this function, handing the sequences over to #'coerce if we don't understand them here. * cl-macs.el (inline): Don't proclaim #'concatenate as inline, its compiler macro is more useful than doing that. 2011-01-11 Aidan Kehoe <kehoea@parhasard.net> * subr.el (delete, delq, remove, remq): Move #'remove, #'remq here, they don't belong in cl-seq.el; move #'delete, #'delq here from fns.c, implement them in terms of #'delete*, allowing support for sequences generally. * update-elc.el (do-autoload-commands): Use #'delete*, not #'delq here, now the latter's no longer dumped. * cl-macs.el (delete, delq): Add compiler macros transforming #'delete and #'delq to #'delete* calls. 2011-01-10 Aidan Kehoe <kehoea@parhasard.net> * dialog.el (make-dialog-box): Correct a misplaced parenthesis here, thank you Mats Lidell in 87zkr9gqrh.fsf@mail.contactor.se ! 2011-01-02 Aidan Kehoe <kehoea@parhasard.net> * dialog.el (make-dialog-box): * list-mode.el (display-completion-list): These functions used to use cl-parsing-keywords; change them to use defun* instead, fixing the build. (Not sure what led to me not including this change in d1b17a33450b!) 2011-01-02 Aidan Kehoe <kehoea@parhasard.net> * cl-macs.el (define-star-compiler-macros): Make sure the form has ITEM and LIST specified before attempting to change to calls with explicit tests; necessary for some tests in lisp-tests.el to compile correctly. (stable-union, stable-intersection): Add compiler macros for these functions, in the same way we do for most of the other functions in cl-seq.el. 2011-01-01 Aidan Kehoe <kehoea@parhasard.net> * cl-macs.el (dolist, dotimes, do-symbols, macrolet) (symbol-macrolet): Define these macros with defmacro* instead of parsing the argument list by hand, for the sake of style and readability; use backquote where appropriate, instead of calling #'list and and friends, for the same reason. 2010-12-30 Aidan Kehoe <kehoea@parhasard.net> * x-misc.el (device-x-display): Provide this function, documented in the Lispref for years, but not existing previously. Thank you Julian Bradfield, thank you Jeff Mincy. 2010-12-30 Aidan Kehoe <kehoea@parhasard.net> * cl-seq.el: Move the heavy lifting from this file to C. Dump the cl-parsing-keywords macro, but don't use defun* for the functions we define that do take keywords, dynamic scope lossage makes that not practical. * subr.el (sort, fillarray): Move these aliases here. (map-plist): #'nsublis is now built-in, but at this point #'eql isn't necessarily available as a test; use #'eq. * obsolete.el (cl-delete-duplicates): Make this available for old compiler macros and old code. (memql): Document that this is equivalent to #'member*, and worse. * cl.el (adjoin, subst): Removed. These are in C. 2010-12-30 Aidan Kehoe <kehoea@parhasard.net> * simple.el (assoc-ignore-case): Remove a duplicate definition of this function (it's already in subr.el). * iso8859-1.el (char-width): On non-Mule, make this function equivalent to that produced by (constantly 1), but preserve its docstring. * subr.el (subst-char-in-string): Define this in terms of #'substitute, #'nsubstitute. (string-width): Define this using #'reduce and #'char-width. (char-width): Give this a simpler definition, it makes far more sense to check for mule at load time and redefine, as we do in iso8859-1.el. (store-substring): Implement this in terms of #'replace, now #'replace is cheap. 2010-12-30 Aidan Kehoe <kehoea@parhasard.net> * update-elc.el (lisp-files-needed-for-byte-compilation) (lisp-files-needing-early-byte-compilation): cl-macs belongs in the former, not the latter, it is as fundamental as bytecomp.el. 2010-12-30 Aidan Kehoe <kehoea@parhasard.net> * cl.el: Provde the Common Lisp program-error, type-error as error symbols. This doesn't nearly go far enough for anyone using the Common Lisp errors. 2010-12-29 Aidan Kehoe <kehoea@parhasard.net> * cl-macs.el (delete-duplicates): If the form has an incorrect number of arguments, don't attempt a compiler macroexpansion. 2010-12-29 Aidan Kehoe <kehoea@parhasard.net> * cl-macs.el (cl-safe-expr-p): Forms that start with the symbol lambda are also safe. 2010-12-29 Aidan Kehoe <kehoea@parhasard.net> * cl-macs.el (= < > <= >=): For these functions' compiler macros, the optimisation is safe even if the first and the last arguments have side effects, since they're only used the once. 2010-12-29 Aidan Kehoe <kehoea@parhasard.net> * cl-macs.el (inline-side-effect-free-compiler-macros): Unroll a loop here at macro-expansion time, so these compiler macros are compiled. Use #'eql instead of #'eq in a couple of places for better style. 2010-12-29 Aidan Kehoe <kehoea@parhasard.net> * cl-extra.el (notany, notevery): Avoid some dynamic scope stupidity with local variable names in these functions, when they weren't prefixed with cl-; go into some more detail in the doc strings. 2010-12-29 Aidan Kehoe <kehoea@parhasard.net> * byte-optimize.el (side-effect-free-fns): #'remove, #'remq are free of side-effects. (side-effect-and-error-free-fns): Drop dot, dot-marker from the list. 2010-11-17 Aidan Kehoe <kehoea@parhasard.net> * cl-extra.el (coerce): In the argument list, name the first argument OBJECT, not X; the former name was always used in the doc string and is clearer. Handle vector type specifications which include the length of the target sequence, error if there's a mismatch. * cl-macs.el (cl-make-type-test): Handle type specifications starting with the symbol 'eql. 2010-11-14 Aidan Kehoe <kehoea@parhasard.net> * cl-macs.el (eql): Don't remove the byte-compile property of this symbol. That was necessary to override a bug in bytecomp.el where #'eql was confused with #'eq, which bug we no longer have. If neither expression is constant, don't attempt to handle the expression in this compiler macro, leave it to byte-compile-eql, which produces better code anyway. * bytecomp.el (eq): #'eql is not the function associated with the byte-eq byte code. (byte-compile-eql): Add an explicit compile method for this function, for cases where the cl-macs compiler macro hasn't reduced it to #'eq or #'equal. 2010-10-25 Aidan Kehoe <kehoea@parhasard.net> Add compiler macros and compilation sanity-checking for various functions that take keywords. * byte-optimize.el (side-effect-free-fns): #'symbol-value is side-effect free and not error free. * bytecomp.el (byte-compile-normal-call): Check keyword argument lists for sanity; store information about the positions where keyword arguments start using the new byte-compile-keyword-start property. * cl-macs.el (cl-const-expr-val): Take a new optional argument, cl-not-constant, defaulting to nil, in this function; return it if the expression is not constant. (cl-non-fixnum-number-p): Make this into a separate function, we want to pass it to #'every. (eql): Use it. (define-star-compiler-macros): Use the same code to generate the member*, assoc* and rassoc* compiler macros; special-case some code in #'add-to-list in subr.el. (remove, remq): Add compiler macros for these two functions, in preparation for #'remove being in C. (define-foo-if-compiler-macros): Transform (remove-if-not ...) calls to (remove ... :if-not) at compile time, which will be a real win once the latter is in C. (define-substitute-if-compiler-macros) (define-subst-if-compiler-macros): Similarly for these functions. (delete-duplicates): Change this compiler macro to use #'plists-equal; if we don't have information about the type of SEQUENCE at compile time, don't bother attempting to inline the call, the function will be in C soon enough. (equalp): Remove an old commented-out compiler macro for this, if we want to see it it's in version control. (subst-char-in-string): Transform this to a call to nsubstitute or nsubstitute, if that is appropriate. * cl.el (ldiff): Don't call setf here, this makes for a load-time dependency problem in cl-macs.el 2010-06-14 Stephen J. Turnbull <stephen@xemacs.org> * term/vt100.el: Refer to XEmacs, not GNU Emacs, in permissions. * term/bg-mouse.el: * term/sup-mouse.el: Put copyright notice in canonical "Copyright DATE AUTHOR" form. Refer to XEmacs, not GNU Emacs, in permissions. * site-load.el: Add permission boilerplate. * mule/canna-leim.el: * alist.el: Refer to XEmacs, not APEL/this program, in permissions. * mule/canna-leim.el: Remove my copyright, I've assigned it to the FSF. 2010-06-14 Stephen J. Turnbull <stephen@xemacs.org> * gtk.el: * gtk-widget-accessors.el: * gtk-package.el: * gtk-marshal.el: * gtk-compose.el: * gnome.el: Add copyright notice based on internal evidence. 2010-06-14 Stephen J. Turnbull <stephen@xemacs.org> * easymenu.el: Add reference to COPYING to permission notice. * gutter.el: * gutter-items.el: * menubar-items.el: Fix typo "Xmacs" in permissions notice. 2010-06-14 Stephen J. Turnbull <stephen@xemacs.org> * auto-save.el: * font.el: * fontconfig.el: * mule/kinsoku.el: Add "part of XEmacs" text to permission notice. 2010-10-14 Aidan Kehoe <kehoea@parhasard.net> * byte-optimize.el (side-effect-free-fns): * cl-macs.el (remf, getf): * cl-extra.el (tailp, cl-set-getf, cl-do-remf): * cl.el (ldiff, endp): Tighten up Common Lisp compatibility for #'ldiff, #'endp, #'tailp; add circularity checking for the first two. #'cl-set-getf and #'cl-do-remf were Lisp implementations of #'plist-put and #'plist-remprop; change the names to aliases, changes the macros that use them to using #'plist-put and #'plist-remprop directly. 2010-10-12 Aidan Kehoe <kehoea@parhasard.net> * abbrev.el (fundamental-mode-abbrev-table, global-abbrev-table): Create both these abbrev tables using the usual #'define-abbrev-table calls, rather than attempting to special-case them. * cl-extra.el: Force cl-macs to be loaded here, if cl-extra.el is being loaded interpreted. Previously other, later files would redundantly call (load "cl-macs") when interpreted, it's more reasonable to do it here, once. * cmdloop.el (read-quoted-char-radix): Use defcustom here, we don't have any dump-order dependencies that would prevent that. * custom.el (eval-when-compile): Don't load cl-macs when interpreted or when byte-compiling, rely on cl-extra.el in the former case and the appropriate entry in bytecomp-load-hook in the latter. Get rid of custom-declare-variable-list, we have no dump-time dependencies that would require it. * faces.el (eval-when-compile): Don't load cl-macs when interpreted or when byte-compiling. * packages.el: Remove some inaccurate comments. * post-gc.el (cleanup-simple-finalizers): Use #'delete-if-not here, now the order of preloaded-file-list has been changed to make it available. * subr.el (custom-declare-variable-list): Remove. No need for it. Also remove a stub define-abbrev-table from this file, given the current order of preloaded-file-list there's no need for it. 2010-10-10 Aidan Kehoe <kehoea@parhasard.net> * bytecomp.el (byte-compile-constp) Forms quoted with FUNCTION are also constant. (byte-compile-initial-macro-environment): In #'the, if FORM is constant and does not match TYPE, warn at byte-compile time. 2010-10-10 Aidan Kehoe <kehoea@parhasard.net> * backquote.el (bq-vector-contents, bq-list*): Remove; the former is equivalent to (append VECTOR nil), the latter to (list* ...). (bq-process-2): Use (append VECTOR nil) instead of using #'bq-vector-contents to convert to a list. (bq-process-1): Now we use list* instead of bq-list * subr.el (list*): Moved from cl.el, since it is now required to be available the first time a backquoted form is encountered. * cl.el (list*): Move to subr.el. 2010-09-16 Aidan Kehoe <kehoea@parhasard.net> * test-harness.el (Check-Message): Add an omitted comma here, thank you the buildbot. 2010-09-16 Aidan Kehoe <kehoea@parhasard.net> * hash-table.el (hash-table-key-list, hash-table-value-list) (hash-table-key-value-alist, hash-table-key-value-plist): Remove some useless #'nreverse calls in these files; our hash tables have no order, it's not helpful to pretend they do. * behavior.el (read-behavior): Do the same in this file, in some code evidently copied from hash-table.el. 2010-09-16 Aidan Kehoe <kehoea@parhasard.net> * info.el (Info-insert-dir): * format.el (format-deannotate-region): * files.el (cd, save-buffers-kill-emacs): Use #'some, #'every and related functions for applying boolean operations to lists, instead of rolling our own ones that cons and don't short-circuit. 2010-09-16 Aidan Kehoe <kehoea@parhasard.net> * bytecomp.el (byte-compile-initial-macro-environment): * cl-macs.el (the): Rephrase the docstring, make its implementation when compiling files a little nicer. 2010-09-16 Aidan Kehoe <kehoea@parhasard.net> * descr-text.el (unidata-initialize-unicodedata-database) (unidata-initialize-unihan-database, describe-char-unicode-data) (describe-char-unicode-data): Wrap calls to the database functions with (with-fboundp ...), avoiding byte compile warnings on builds without support for the database functions. (describe-char): (reduce #'max ...), not (apply #'max ...), no need to cons needlessly. (describe-char): Remove a redundant lambda wrapping #'extent-properties. (describe-char-unicode-data): Call #'nsubst when replacing "" with nil in the result of #'split-string, instead of consing inside mapcar. 2010-09-16 Aidan Kehoe <kehoea@parhasard.net> * x-faces.el (x-available-font-sizes): * specifier.el (let-specifier): * package-ui.el (pui-add-required-packages): * msw-faces.el (mswindows-available-font-sizes): * modeline.el (modeline-minor-mode-menu): * minibuf.el (minibuf-directory-files): Replace the O2N (delq nil (mapcar (lambda (W) (and X Y)) Z)) with the ON (mapcan (lambda (W) (and X (list Y))) Z) in these files. 2010-09-16 Aidan Kehoe <kehoea@parhasard.net> * cl-macs.el (= < > <= >=): When these functions are handed more than two arguments, and those arguments have no side effects, transform to a series of two argument calls, avoiding funcall in the byte-compiled code. * mule/mule-cmds.el (finish-set-language-environment): Take advantage of this change in a function called 256 times at startup. 2010-09-16 Aidan Kehoe <kehoea@parhasard.net> * bytecomp.el (byte-compile-function-form, byte-compile-quote) (byte-compile-quote-form): Warn at compile time, and error at runtime, if a (quote ...) or a (function ...) form attempts to quote more than one object. 2010-09-16 Aidan Kehoe <kehoea@parhasard.net> * byte-optimize.el (byte-optimize-apply): Transform (apply 'nconc (mapcar ...)) to (mapcan ...); warn about use of the first idiom. * update-elc.el (do-autoload-commands): * packages.el (packages-find-package-library-path): * frame.el (frame-list): * extents.el (extent-descendants): * etags.el (buffer-tag-table-files): * dumped-lisp.el (preloaded-file-list): * device.el (device-list): * bytecomp-runtime.el (proclaim-inline, proclaim-notinline) Use #'mapcan, not (apply #'nconc (mapcar ...) in all these files. * bytecomp-runtime.el (eval-when-compile, eval-and-compile): In passing, mention that these macros also evaluate the body when interpreted. tests/ChangeLog addition: 2011-02-07 Aidan Kehoe <kehoea@parhasard.net> * automated/lisp-tests.el: Test lexical scope for `block', `return-from'; add a Known-Bug-Expect-Failure for a contorted example that fails when byte-compiled.

/* Get the system load averages.
   Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93, 1994, 1995
	Free Software Foundation, Inc.

This file is part of XEmacs.

XEmacs is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

XEmacs is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with XEmacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Compile-time symbols that this file uses:

   FIXUP_KERNEL_SYMBOL_ADDR()	Adjust address in returned struct nlist.
   KERNEL_FILE			Pathname of the kernel to nlist.
   LDAV_CVT()			Scale the load average from the kernel.
				Returns a double.
   LDAV_SYMBOL			Name of kernel symbol giving load average.
   LOAD_AVE_TYPE		Type of the load average array in the kernel.
				Must be defined; otherwise, no load average
				is available.
   NLIST_STRUCT			Include nlist.h, not a.out.h, and
				the nlist n_name element is a pointer,
				not an array.
   LINUX_LDAV_FILE		[__linux__]: File containing load averages.

   Specific system predefines this file uses, aside from setting
   default values if not emacs:

   BSD				Real BSD, not just BSD-like.
   hpux
   sgi
   WIN32_NATIVE			No-op for Windows9x/NT.
   CYGWIN			No-op for Cygwin.
   __linux__			Linux: assumes /proc filesystem mounted.
   				Support from Michael K. Johnson.
   __NetBSD__			NetBSD: assumes /kern filesystem mounted.
   __OpenBSD__			OpenBSD: ditto.

   In addition, to avoid nesting many #ifdefs, we internally set
   LDAV_DONE to indicate that the load average has been computed.

   We also #define LDAV_PRIVILEGED if a program will require
   special installation to be able to call getloadavg.  */

/* This should always be first.  */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "lisp.h"
#include "sysfile.h" /* for encapsulated open, close, read, write */

#ifndef HAVE_GETLOADAVG

/* The existing Emacs configuration files define a macro called
   LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
   returns the load average multiplied by 100.  What we actually want
   is a macro called LDAV_CVT, which returns the load average as an
   unmultiplied double.

   For backwards compatibility, we'll define LDAV_CVT in terms of
   LOAD_AVE_CVT, but future machine config files should just define
   LDAV_CVT directly.  */

#if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
#define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
#endif

#if defined (HAVE_KSTAT_H)
#include <kstat.h>
#endif /* HAVE_KSTAT_H */

/* Set values that are different from the defaults, which are
   set a little farther down with #ifndef.  */


/* Some shorthands.  */

#if defined (HPUX) && !defined (hpux)
#define hpux
#endif

#if (defined(sun) && defined(SVR4)) || defined (SOLARIS2)
#define SUNOS_5
#endif

#if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
#define OSF_ALPHA
#include <netdb.h>
#include <netinet/in.h>		/* Needed for Digital UNIX V3 */
#include <net/proto_net.h>
#include <sys/table.h>
#endif

#if defined (__osf__) && (defined (mips) || defined (__mips__))
#define OSF_MIPS
#include <sys/table.h>
#endif


/* VAX C can't handle multi-line #ifs, or lines longer than 256 chars.  */
#ifndef LOAD_AVE_TYPE

#ifdef sun
#define LOAD_AVE_TYPE long
#endif

#ifdef decstation
#define LOAD_AVE_TYPE long
#endif

#ifdef sgi
#define LOAD_AVE_TYPE long
#endif

#ifdef SVR4
#define LOAD_AVE_TYPE long
#endif

#ifdef sony_news
#define LOAD_AVE_TYPE long
#endif

#ifdef OSF_ALPHA
#define LOAD_AVE_TYPE long
#endif

#if defined (ardent) && defined (titan)
#define LOAD_AVE_TYPE long
#endif

#ifdef _AIX
#define LOAD_AVE_TYPE long
#endif

#endif /* No LOAD_AVE_TYPE.  */

#ifdef OSF_ALPHA
/* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
   according to ghazi@noc.rutgers.edu.  */
#undef FSCALE
#define FSCALE 1024.0
#endif

#ifndef	FSCALE

/* SunOS and some others define FSCALE in sys/param.h.  */

#if defined(MIPS) || defined(SVR4) || defined(decstation)
#define FSCALE 256
#endif

#if defined (sgi)
/* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
   above under #ifdef MIPS.  But we want the sgi value.  */
#undef FSCALE
#define	FSCALE 1000.0
#endif

#if defined (ardent) && defined (titan)
#define FSCALE 65536.0
#endif

#ifdef _AIX
#define FSCALE 65536.0
#endif

#endif	/* Not FSCALE.  */

#if !defined (LDAV_CVT) && defined (FSCALE)
#define	LDAV_CVT(n) (((double) (n)) / FSCALE)
#endif

/* VAX C can't handle multi-line #ifs, or lines longer that 256 characters.  */
#ifndef NLIST_STRUCT

#ifdef sun
#define NLIST_STRUCT
#endif

#ifdef decstation
#define NLIST_STRUCT
#endif

#ifdef hpux
#define NLIST_STRUCT
#endif

#ifdef sgi
#define NLIST_STRUCT
#endif

#ifdef SVR4
#define NLIST_STRUCT
#endif

#ifdef sony_news
#define NLIST_STRUCT
#endif

#ifdef OSF_ALPHA
#define NLIST_STRUCT
#endif

#if defined (ardent) && defined (titan)
#define NLIST_STRUCT
#endif

#ifdef butterfly
#define NLIST_STRUCT
#endif

#ifdef _AIX
#define NLIST_STRUCT
#endif

#endif /* defined (NLIST_STRUCT) */


#if defined(sgi) || (defined(mips) && !defined(BSD))
#define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
#endif

#if !defined (KERNEL_FILE) && defined (hpux)
#define KERNEL_FILE "/hp-ux"
#endif

#if !defined(KERNEL_FILE) && (defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || defined(SVR4) || (defined (ardent) && defined (titan)))
#define KERNEL_FILE "/unix"
#endif

#if !defined(LDAV_SYMBOL) && (defined(hpux) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)) || defined (_AIX))
#define LDAV_SYMBOL "avenrun"
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include <stdio.h>

/* LOAD_AVE_TYPE should only get defined if we're going to use the
   nlist method.  */
#if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL))
#define LOAD_AVE_TYPE double
#endif

#ifdef LOAD_AVE_TYPE

#ifndef NLIST_STRUCT
#include <a.out.h>
#else /* NLIST_STRUCT */
#include <nlist.h>
#endif /* NLIST_STRUCT */

#ifdef SUNOS_5
#include <fcntl.h>
#include <kvm.h>
#endif

#ifndef KERNEL_FILE
#define KERNEL_FILE "/vmunix"
#endif /* KERNEL_FILE */

#ifndef LDAV_SYMBOL
#define LDAV_SYMBOL "_avenrun"
#endif /* LDAV_SYMBOL */

#ifndef LDAV_CVT
#define LDAV_CVT(n) ((double) (n))
#endif /* !LDAV_CVT */

#endif /* LOAD_AVE_TYPE */

#ifdef sgi
#include <sys/sysmp.h>
#endif /* sgi */

#if defined (HAVE_SYS_PSTAT_H)
#include <sys/pstat.h>
#endif /* HAVE_SYS_PSTAT_H (on HPUX) */


/* Avoid static vars inside a function since in HPUX they dump as pure.  */

#ifdef LOAD_AVE_TYPE
/* File descriptor open to /dev/kmem */
static int channel;
/* Nonzero iff channel is valid.  */
static int getloadavg_initialized;
/* Offset in kmem to seek to read load average, or 0 means invalid.  */
static long offset;

#ifndef sgi
static struct nlist nl[2];
#endif /* not sgi */

#ifdef SUNOS_5
static kvm_t *kd;
#endif /* SUNOS_5 */

#ifndef countof
# define countof(x) (sizeof (x) / sizeof (*(x)))
#endif

#endif /* LOAD_AVE_TYPE */

/* Put the 1 minute, 5 minute and 15 minute load averages
   into the first NELEM elements of LOADAVG.
   Return the number written (never more than 3, but may be less than NELEM),
   or -1 if an error occurred.  */

int getloadavg (double loadavg[], int nelem);

int
getloadavg (double loadavg[], int nelem)
{
  int elem = 0;			/* Return value.  */

#ifdef NO_GET_LOAD_AVG
#define LDAV_DONE
  /* Set errno to zero to indicate that there was no particular error;
     this function just can't work at all on this system.  */
  errno = 0;
  elem = -2;
#endif /* NO_GET_LOAD_AVG */

#if ! defined (LDAV_DONE) && defined (HAVE_KSTAT_H) && defined (HAVE_LIBKSTAT)
#define LDAV_DONE
/* getloadavg is best implemented using kstat (kernel stats), on
   systems (like SunOS5) that support it, since you don't need special
   privileges to use it.

   Initial implementation courtesy Zlatko Calusic <zcalusic@carnet.hr>.
   Integrated to XEmacs by Hrvoje Niksic <hniksic@xemacs.org>.
   Additional cleanup by Hrvoje Niksic, based on code published by
   Casper Dik <Casper.Dik@Holland.Sun.Com>.  */
  kstat_ctl_t *kc;
  kstat_t *ksp;
  static char *avestrings[] = { "avenrun_1min",
				"avenrun_5min",
				"avenrun_15min" };

  if (nelem > countof (avestrings))
    nelem = countof (avestrings);

  kc = kstat_open ();
  if (!kc)
    return -1;
  ksp = kstat_lookup (kc, "unix", 0, "system_misc");
  if (!ksp)
    {
      kstat_close (kc);
      return -1;
    }
  if (kstat_read (kc, ksp, 0) < 0)
    {
      kstat_close (kc);
      return -1;
    }
  for (elem = 0; elem < nelem; elem++)
    {
      kstat_named_t *kn =
	(kstat_named_t *) kstat_data_lookup (ksp, avestrings[elem]);
      if (!kn)
	{
	  kstat_close (kc);
	  return -1;
	}
      loadavg[elem] = (double)kn->value.ul / FSCALE;
    }
  kstat_close (kc);
#endif /* HAVE_KSTAT_H && HAVE_LIBKSTAT */

#if !defined (LDAV_DONE) && defined (HAVE_SYS_PSTAT_H)
#define LDAV_DONE
  /* This is totally undocumented, and is not guaranteed to work, but
     mayhap it might ....  If it does work, it will work only on HP-UX
     8.0 or later.  -- Darryl Okahata <darrylo@sr.hp.com> */
#undef LOAD_AVE_TYPE		/* Make sure these don't exist. */
#undef LOAD_AVE_CVT
#undef LDAV_SYMBOL
  struct pst_dynamic	procinfo;
  union pstun		statbuf;

  statbuf.pst_dynamic = &procinfo;
  if (pstat (PSTAT_DYNAMIC, statbuf, sizeof (struct pst_dynamic), 0, 0) == -1)
    return (-1);
  loadavg[elem++] = procinfo.psd_avg_1_min;
  loadavg[elem++] = procinfo.psd_avg_5_min;
  loadavg[elem++] = procinfo.psd_avg_15_min;
#endif	/* HPUX */

#if !defined (LDAV_DONE) && defined (__linux__)
#define LDAV_DONE
#undef LOAD_AVE_TYPE

#ifndef LINUX_LDAV_FILE
#define LINUX_LDAV_FILE "/proc/loadavg"
#endif

  char ldavgbuf[40];
  double load_ave[3];
  int fd, count;

  fd = retry_open (LINUX_LDAV_FILE, O_RDONLY);
  if (fd == -1)
    return -1;
  count = retry_read (fd, ldavgbuf, 40);
  (void) retry_close (fd);
  if (count <= 0)
    return -1;

  count = sscanf (ldavgbuf, "%lf %lf %lf",
		  &load_ave[0], &load_ave[1], &load_ave[2]);
  if (count < 1)
    return -1;

  for (elem = 0; elem < nelem && elem < count; elem++)
    loadavg[elem] = load_ave[elem];
#endif /* __linux__ */

#if !defined (LDAV_DONE) && defined (__NetBSD__) || defined (__OpenBSD__)
#define LDAV_DONE
#undef LOAD_AVE_TYPE

#ifndef NETBSD_LDAV_FILE
#define NETBSD_LDAV_FILE "/kern/loadavg"
#endif

  unsigned long int load_ave[3], scale;
  int count;
  FILE *fp;

  fp = retry_fopen (NETBSD_LDAV_FILE, "r");
  if (fp == NULL)
    return -1;
  count = fscanf (fp, "%lu %lu %lu %lu\n",
		  &load_ave[0], &load_ave[1], &load_ave[2],
		  &scale);
  (void) retry_fclose (fp);
  if (count != 4)
    return -1;

  for (elem = 0; elem < nelem; elem++)
    loadavg[elem] = (double) load_ave[elem] / (double) scale;
#endif /* __NetBSD__ or __OpenBSD__ */

#if !defined (LDAV_DONE) && defined (WIN32_ANY)
#define LDAV_DONE

  /* A faithful emulation is going to have to be saved for a rainy day.  */
  for ( ; elem < nelem; elem++)
    {
      loadavg[elem] = 0.0;
    }
#endif  /* WIN32_NATIVE or CYGWIN */

#if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE)

  /* UNIX-specific code -- read the average from /dev/kmem.  */

#define LDAV_PRIVILEGED		/* This code requires special installation.  */

  LOAD_AVE_TYPE load_ave[3];

  /* Get the address of LDAV_SYMBOL.  */
  if (offset == 0)
    {
#ifndef sgi
#ifndef NLIST_STRUCT
      strcpy (nl[0].n_name, LDAV_SYMBOL);
      strcpy (nl[1].n_name, "");
#else /* NLIST_STRUCT */
      nl[0].n_name = (char *) LDAV_SYMBOL;
      nl[1].n_name = 0;
#endif /* NLIST_STRUCT */

#ifndef SUNOS_5
      if (
#if !(defined (_AIX) && !defined (ps2))
	  nlist (KERNEL_FILE, nl)
#else  /* _AIX */
	  knlist (nl, 1, sizeof (nl[0]))
#endif
	  >= 0)
	  /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i.  */
	  {
#ifdef FIXUP_KERNEL_SYMBOL_ADDR
	    FIXUP_KERNEL_SYMBOL_ADDR (nl);
#endif
	    offset = nl[0].n_value;
	  }
#endif /* !SUNOS_5 */
#else  /* sgi */
	  int ldav_off;

	  ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
	  if (ldav_off != -1)
	  offset = (long) ldav_off & 0x7fffffff;
#endif /* sgi */
	}

  /* Make sure we have /dev/kmem open.  */
  if (!getloadavg_initialized)
    {
#ifndef SUNOS_5
      channel = retry_open ("/dev/kmem", 0);
      if (channel >= 0)
	{
	  /* Set the channel to close on exec, so it does not
	     litter any child's descriptor table.  */
#ifdef FD_SETFD
#ifndef FD_CLOEXEC
#define FD_CLOEXEC 1
#endif
	  (void) fcntl (channel, F_SETFD, FD_CLOEXEC);
#endif
	  getloadavg_initialized = 1;
	}
#else /* SUNOS_5 */
      /* We pass 0 for the kernel, corefile, and swapfile names
	 to use the currently running kernel.  */
      kd = kvm_open (0, 0, 0, O_RDONLY, 0);
      if (kd != 0)
	{
	  /* nlist the currently running kernel.  */
	  kvm_nlist (kd, nl);
	  offset = nl[0].n_value;
	  getloadavg_initialized = 1;
	}
#endif /* SUNOS_5 */
    }

  /* If we can, get the load average values.  */
  if (offset && getloadavg_initialized)
    {
      /* Try to read the load.  */
#ifndef SUNOS_5
      if (lseek (channel, offset, 0) == -1L
	  || retry_read (channel, (char *) load_ave, sizeof (load_ave))
	  != sizeof (load_ave))
	{
	  retry_close (channel);
	  getloadavg_initialized = 0;
	}
#else  /* SUNOS_5 */
      if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
	  != sizeof (load_ave))
        {
          kvm_close (kd);
          getloadavg_initialized = 0;
	}
#endif /* SUNOS_5 */
    }

  if (offset == 0 || !getloadavg_initialized)
    return -1;

  if (nelem > 0)
    loadavg[elem++] = LDAV_CVT (load_ave[0]);
  if (nelem > 1)
    loadavg[elem++] = LDAV_CVT (load_ave[1]);
  if (nelem > 2)
    loadavg[elem++] = LDAV_CVT (load_ave[2]);

#define LDAV_DONE
#endif /* !LDAV_DONE && LOAD_AVE_TYPE */

  return elem;
}

#endif /* ! HAVE_GETLOADAVG */

#ifdef TEST
void
main (int argc, char **argv)
{
  int naptime = 0;

  if (argc > 1)
    naptime = atoi (argv[1]);

  while (1)
    {
      double avg[3];
      int loads;

      errno = 0;		/* Don't be misled if it doesn't set errno.  */
      loads = getloadavg (avg, 3);
      if (loads == -1)
	{
	  perror ("Error getting load average");
	  exit (1);
	}
      if (loads > 0)
	printf ("1-minute: %f  ", avg[0]);
      if (loads > 1)
	printf ("5-minute: %f  ", avg[1]);
      if (loads > 2)
	printf ("15-minute: %f  ", avg[2]);
      if (loads > 0)
	putchar ('\n');

      if (naptime == 0)
	break;
      sleep (naptime);
    }

  exit (0);
}
#endif /* TEST */