[PATCH] Byte compile the code s-expressions stored by defcustom
15 years, 6 months
Aidan Kehoe
At the moment, defcustom forms are compiled with the value expression
uncompiled, which, given how much slower uncompiled code is in XEmacs, is a
loss for us if complex expressions are given, which is routine. This byte
compiles those expressions. It also byte compiles any #'-quoted or unquoted
lambdas in the arguments, which is something GNU does (but they don’t *do*
the former right now, though they are discussing it). Their bytecomp.el has,
beyond this, lots of functionality that it should be worth merging--nothing
huge, but helpful all the same.
lisp/ChangeLog addition:
2007-11-15 Aidan Kehoe <kehoea(a)parhasard.net>
* bytecomp.el (byte-compile-file-form-custom-declare-variable):
Byte compile the DEFAULT argument to custom-declare-variable, to
speed up complex expressions; also byte compile any lambda
expressions in the argument list.
XEmacs Trunk source patch:
Diff command: cvs -q diff -Nu
Files affected: lisp/bytecomp.el
===================================================================
RCS
Index: lisp/bytecomp.el
===================================================================
RCS file: /pack/xemacscvs/XEmacs/xemacs/lisp/bytecomp.el,v
retrieving revision 1.20
diff -u -u -r1.20 bytecomp.el
--- lisp/bytecomp.el 2007/05/12 10:17:01 1.20
+++ lisp/bytecomp.el 2007/11/15 21:24:51
＠＠ -2376,13 +2376,33 ＠＠
(put 'custom-declare-variable 'byte-hunk-handler
'byte-compile-file-form-custom-declare-variable)
(defun byte-compile-file-form-custom-declare-variable (form)
- (if (memq 'free-vars byte-compile-warnings)
- (setq byte-compile-bound-variables
- (cons (cons (nth 1 (nth 1 form))
- byte-compile-global-bit)
- byte-compile-bound-variables)))
- form)
-
+ ;; XEmacs change; our implementation byte compiles the default value code,
+ ;; which GNU's doesn't.
+ (let* ((quoted-default (car-safe (cdr-safe (cdr-safe form))))
+ (to-examine (car-safe (cdr-safe quoted-default))))
+ (if (memq 'free-vars byte-compile-warnings)
+ (setq byte-compile-bound-variables
+ (cons (cons (nth 1 (nth 1 form))
+ byte-compile-global-bit)
+ byte-compile-bound-variables)))
+ ;; Byte compile the default value, as we do for defvar.
+ (when (consp to-examine)
+ (setq form (copy-sequence form))
+ (setcdr (third form)
+ (list (byte-compile-top-level to-examine nil 'file))))
+ ;; Byte compile anything that smells like a lambda. I initially
+ ;; considered limiting it to the :initialize, :set and :get args, but
+ ;; that's not amazingly forward-compatible, and anyone expecting other
+ ;; things to be stored as data, not code, is unrealistic.
+ (loop
+ for entry in-ref (nthcdr 4 form)
+ do (cond ((and (eq 'function (car-safe entry))
+ (consp (car-safe (cdr-safe entry))))
+ (setf entry (copy-sequence entry))
+ (setcar (cdr entry) (byte-compile-lambda (car (cdr entry)))))
+ ((and (eq 'lambda (car-safe entry)))
+ (setf entry (byte-compile-lambda entry)))))
+ form))
;;;###autoload
(defun byte-compile (form)
--
On the quay of the little Black Sea port, where the rescued pair came once
more into contact with civilization, Dobrinton was bitten by a dog which was
assumed to be mad, though it may only have been indiscriminating. (Saki)
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[COMMIT] Remove a useless let binding in byte-optimize-featurep
15 years, 6 months
Aidan Kehoe
APPROVE COMMIT
NOTE: This patch has been committed.
lisp/ChangeLog addition:
2007-11-27 Aidan Kehoe <kehoea(a)parhasard.net>
* byte-optimize.el (byte-optimize-featurep):
Remove a useless let binding that was a hangover from an earlier
version of the code. Eliminates a byte-compile time warning.
XEmacs Trunk source patch:
Diff command: cvs -q diff -u
Files affected: lisp/byte-optimize.el
===================================================================
RCS
Index: lisp/byte-optimize.el
===================================================================
RCS file: /pack/xemacscvs/XEmacs/xemacs/lisp/byte-optimize.el,v
retrieving revision 1.13
diff -u -r1.13 byte-optimize.el
--- lisp/byte-optimize.el 2007/10/15 10:55:49 1.13
+++ lisp/byte-optimize.el 2007/11/27 15:28:58
＠＠ -1174,15 +1174,14 ＠＠
(put 'featurep 'byte-optimizer 'byte-optimize-featurep)
(defun byte-optimize-featurep (form)
- (let ((to-check (cdr-safe form)))
- (if (memq (car-safe
- (cdr-safe
- (car-safe
- (cdr-safe
- form))))
- byte-optimize-ever-present-features)
- t
- form)))
+ (if (memq (car-safe
+ (cdr-safe
+ (car-safe
+ (cdr-safe
+ form))))
+ byte-optimize-ever-present-features)
+ t
+ form))
;;; enumerating those functions which need not be called if the returned
--
¿Dónde estará ahora mi sobrino Yoghurtu Nghé, que tuvo que huir
precipitadamente de la aldea por culpa de la escasez de rinocerontes?
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[COMMIT] Merge a bugfix to some previously merged SXEmacs #'format code.
15 years, 6 months
Aidan Kehoe
Thank you Hans!
APPROVE COMMIT
NOTE: This patch has been committed.
src/ChangeLog addition:
2007-11-26 Aidan Kehoe <kehoea(a)parhasard.net>
* doprnt.c:
Default to a buffer size of 350 for the sprintf call, but increase
it if the precision and minwidth indicate that it should be
bigger. Issue reported by Hans de Graaff; bug originally fixed by
Sebastian Freundt in SXEmacs following the change I merged on
2006-11-28. Forks have their disadvantages.
tests/ChangeLog addition:
2007-11-26 Aidan Kehoe <kehoea(a)parhasard.net>
* automated/lisp-tests.el:
Check that a couple of previously problematic calls to #'format
succeed.
XEmacs Trunk source patch:
Diff command: cvs -q diff -u
Files affected: tests/automated/lisp-tests.el
===================================================================
RCS src/doprnt.c
===================================================================
RCS
Index: src/doprnt.c
===================================================================
RCS file: /pack/xemacscvs/XEmacs/xemacs/src/doprnt.c,v
retrieving revision 1.32
diff -u -r1.32 doprnt.c
--- src/doprnt.c 2006/11/28 16:09:47 1.32
+++ src/doprnt.c 2007/11/27 13:49:06
＠＠ -776,9 +776,21 ＠＠
#endif /* HAVE_BIGFLOAT */
else
{
- Ascbyte *text_to_print = alloca_array (char, 350);
+ Ascbyte *text_to_print;
Ascbyte constructed_spec[100];
Ascbyte *p = constructed_spec;
+ int alloca_sz = 350;
+ int min = spec->minwidth, prec = spec->precision;
+
+ if (prec < 0)
+ prec = 0;
+ if (min < 0)
+ min = 0;
+
+ if (32+min+prec > alloca_sz)
+ alloca_sz = 32 + min + prec;
+
+ text_to_print = alloca_array(char, alloca_sz);
/* Mostly reconstruct the spec and use sprintf() to
format the string. */
Index: tests/automated/lisp-tests.el
===================================================================
RCS file: /pack/xemacscvs/XEmacs/xemacs/tests/automated/lisp-tests.el,v
retrieving revision 1.7
diff -u -r1.7 lisp-tests.el
--- tests/automated/lisp-tests.el 2004/05/13 15:33:18 1.7
+++ tests/automated/lisp-tests.el 2007/11/27 13:49:06
＠＠ -1279,6 +1279,10 ＠＠
(Assert (= (read (format "%d" most-negative-fixnum)) most-negative-fixnum))
(Assert (= (read (format "%ld" most-negative-fixnum)) most-negative-fixnum))
+;; These used to crash.
+(Assert (eql (read (format "%f" 1.2e+302)) 1.2e+302))
+(Assert (eql (read (format "%.1000d" 1)) 1))
+
;;; "%u" is undocumented, and Emacs Lisp has no unsigned type.
;;; What to do if "%u" is used with a negative number?
;;; For non-bignum XEmacsen, the most reasonable thing seems to be to print an
--
¿Dónde estará ahora mi sobrino Yoghurtu Nghé, que tuvo que huir
precipitadamente de la aldea por culpa de la escasez de rinocerontes?
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[C] xemacsweb: I can finally commit issue36 now that it is resolved
15 years, 6 months
Adrian Aichner
COMMIT
xemacsweb ChangeLog patch:
Diff command: cvs -q diff -U 0
Files affected: About/ChangeLog
Index: About/ChangeLog
===================================================================
RCS file: /pack/xemacscvs/XEmacs/xemacsweb/About/ChangeLog,v
retrieving revision 1.218
diff -u -U0 -r1.218 ChangeLog
--- About/ChangeLog 6 Nov 2007 20:58:59 -0000 1.218
+++ About/ChangeLog 26 Nov 2007 19:00:20 -0000
＠＠ -0,0 +1,4 ＠＠
+2007-11-26 Adrian Aichner <adrian(a)xemacs.org>
+
+ * XEmacsServices.content: Document and resolve issue 36.
+
xemacsweb source patch:
Diff command: cvs -f -z3 -q diff -u -w -N
Files affected: About/XEmacsServices.content
===================================================================
RCS
Index: About/XEmacsServices.content
===================================================================
RCS file: /pack/xemacscvs/XEmacs/xemacsweb/About/XEmacsServices.content,v
retrieving revision 1.71
diff -u -w -r1.71 XEmacsServices.content
--- About/XEmacsServices.content 6 Nov 2007 20:59:00 -0000 1.71
+++ About/XEmacsServices.content 26 Nov 2007 18:56:51 -0000
＠＠ -87,9 +87,57 ＠＠
;; See `sgml-comment-begin', `sgml-comment-end', and
;; http://htmlhelp.com/reference/wilbur/misc/comment.html
(format
- " <tr>\n %2$s Issue ID %3$s\n <td rowspan=\"7\" valign=\"top\"><a id=\"issue%1$d\" name=\"issue%1$d\">%1$d</a></td>\n %2$s Service(s) %3$s\n <td>all services of gwyn.tux.org are unavailable: DNS for xemacs.org, ssh, http, ftp</td>\n %2$s YYYY-MM-DD( HH:MM:SS UTC) Date found %3$s\n <td nowrap=\"nowrap\">YYYY-MM-DD( HH:MM:SS UTC)</td>\n %2$s YYYY-MM-DD( HH:MM:SS UTC) Date fixed %3$s\n <td nowrap=\"nowrap\">YYYY-MM-DD( HH:MM:SS UTC)</td>\n </tr>\n <tr>\n\t%2$s Error(s), Symptom(s) %3$s\n <th colspan=\"3\">Error(s), Symptom(s)</th>\n </tr>\n <tr>\n <td colspan=\"3\">\n\t <p>free-form description of a error or symptom.</p>\n <pre xml:space=\"preserve\">\nSending failed; SMTP protocol error\n221 Closing connection. Good bye.\n\t </pre>\n\t</td>\n </tr>\n <tr>\n\t%2$s Resolution(s) %3$s\n <th colspan=\"3\">Resolution(s)</th>\n </tr>\n <tr>\n !
<td colspan=\"3\">\n\t <p>Description of resolution.</p>\n\t</td>\n </tr>\n <tr>\n\t%2$s Reference(s) %3$s\n <th colspan=\"3\">References</th>\n </tr>\n <tr>\n <td colspan=\"3\">\n\t <p>References to other information, like URLs for external issue documenation.</p>\n\t</td>\n </tr>\n\n"
+ " <tr>\n %2$s Issue ID %3$s\n <td rowspan=\"7\" valign=\"top\"><a id=\"issue%1$d\" name=\"issue%1$d\">%1$d</a></td>\n %2$s Service(s) %3$s\n <td>all services of gwyn.tux.org are unavailable: DNS for xemacs.org, ssh, http, ftp</td>\n %2$s YYYY-MM-DD( HH:MM:SS UTC) Date found %3$s\n <td nowrap=\"nowrap\">YYYY-MM-DD( HH:MM:SS UTC)</td>\n %2$s YYYY-MM-DD( HH:MM:SS UTC) Date fixed %3$s\n <td nowrap=\"nowrap\">YYYY-MM-DD( HH:MM:SS UTC)</td>\n </tr>\n <tr>\n\t%2$s Error(s), Symptom(s) %3$s\n <th colspan=\"3\">Error(s), Symptom(s)</th>\n </tr>\n <tr>\n <td colspan=\"3\">\n\t <p>free-form description of a error or symptom.</p>\n <pre xml:space=\"preserve\">\nSending failed; SMTP protocol error\n221 Closing connection. Good bye.\n\t </pre>\n\t</td>\n </tr>\n <tr>\n\t%2$s Resolution(s) %3$s\n <th colspan=\"3\">Resolution(s)</th>\n </tr>\n <tr>\n !
<td colspan=\"3\">\n\t <p>Description of resolution.</p>\n\t</td>\n </tr>\n <tr>\n\t%2$s Reference(s) %3$s\n <th colspan=\"3\">References</th>\n </tr>\n <tr>\n <td colspan=\"3\">\n\t <p>References to other information, like URLs for external issue documentation.</p>\n\t</td>\n </tr>\n\n"
next-issue-number sgml-comment-begin sgml-comment-end))))
-->
+
+ <tr>
+ <!-- Issue ID -->
+ <td rowspan="7" valign="top"><a id="issue36" name="issue36">36</a></td>
+ <!-- Service(s) -->
+ <td>ssh</td>
+ <!-- YYYY-MM-DD( HH:MM:SS UTC) Date found -->
+ <td nowrap="nowrap">2007-11-24</td>
+ <!-- YYYY-MM-DD( HH:MM:SS UTC) Date fixed -->
+ <td nowrap="nowrap">2007-11-26</td>
+ </tr>
+ <tr>
+ <!-- Error(s), Symptom(s) -->
+ <th colspan="3">Error(s), Symptom(s)</th>
+ </tr>
+ <tr>
+ <td colspan="3">
+ <p>ssh is not functional on cvs.xemacs.org.
+ Consequencially, cvs operations involving access via ssh do
+ not work. CVS read-only access via pserver is
+ operational.</p>
+ <pre xml:space="preserve">
+Connection to cvs.xemacs.org closed by remote host.
+cvs [update aborted]: end of file from server (consult above messages if any)
+ </pre>
+ <pre xml:space="preserve">
+ssh: connect to host dotsrc.org port 22: Connection timed out
+ </pre>
+ </td>
+ </tr>
+ <tr>
+ <!-- Resolution(s) -->
+ <th colspan="3">Resolution(s)</th>
+ </tr>
+ <tr>
+ <td colspan="3">
+ <p></p>
+ </td>
+ </tr>
+ <tr>
+ <!-- Reference(s) -->
+ <th colspan="3">References</th>
+ </tr>
+ <tr>
+ <td colspan="3">
+ <p>The problem has been reported to dotsrc.org.</p>
+ </td>
+ </tr>
<tr>
<!-- Issue ID -->
--
Adrian Aichner
mailto:adrian＠xemacs.org
http://www.xemacs.org/
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[AC21.5] Updating my 21.5 bio info
15 years, 6 months
Vin Shelton
Updating by 21.5 bio.
- Vin
ChangeLog addition:
2007-11-22 Vin Shelton <acs(a)xemacs.org>
* etc/photos/vin.png:
* etc/photos/vinm.png: Updated.
lisp/ChangeLog addition:
2007-11-22 Vin Shelton <acs(a)xemacs.org>
* about.el (about-hacker-contribution): Updated my bio.
- Vin
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[AC21.4] Update my biographical info
15 years, 6 months
Vin Shelton
I'm updating my bio in 21.4 with 21.5 soon to follow.
- Vin
ChangeLog addition:
2007-11-22 Vin Shelton <acs(a)xemacs.org>
* etc/photos/vin.png:
* etc/photos/vinm.png: Updated.
lisp/ChangeLog addition:
2007-11-22 Vin Shelton <acs(a)xemacs.org>
* about.el (about-hacker-contribution): Updated my bio.
- Vin
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Re: [COMMIT] Import make-temp-name (the functionality of mkstemp(3)) from GNU
15 years, 6 months
Aidan Kehoe
Ar an séú lá déag de mí na Samhain, scríobh Stephen J. Turnbull:
> Aidan Kehoe writes:
>
> > > Wouldn't it be better to keep the CODING-SYSTEM name and simply document
> > > the additional semantics? I don't think we should encourage use of this
> > > misfeature in application code.
> >
> > There's no other way, beyond using write-region-internal--not portable to
> > GNU--to access this functionality--avoiding the race condition between
> > checking for a file's existence and creating it. It's ugly, but it is a
> > positive feature.
>
> I'm not suggesting otherwise. I'm just suggesting keeping the *name*
> CODING-SYSTEM.
That’s reasonable enough, and your docstring does that.
> > I'm not sure you're clear on the point of the MUSTBENEW argument. To make
> > the check-for-an-existing-file-if-it-doesn't-exist-create-it operation
> > atomic¹--which it needs to be to avoid security issues for temporary
> > files--it needs to be done in the OS kernel. Which means a subr is needed to
> > expose it to Lisp.
>
> That could be taken as an argument for implementing make-temp-file in
> C. I would prefer that to overengineering `write-region*'. Are there
> security implications for other than make-temp-file,
No.
> and does anybody actually use this feature on non-temp files?
The existing checks in the rest of the emacs code offer the same
functionality, they just don’t offer the atomic guarantee of the O_CREAT |
O_EXCL combination.
> > > BTW, do you insist on 'excl (eg, for gagmacs compatibility)?
> >
> > Yes.
>
> Excuse me while I retch, then.
>
> > I read that to mean that O_EXCL does have function when O_CREAT isn't set,
> > but I admittedly haven't written any code to test that understanding.
>
> I think we'd better, since this is an area with security implications.
>
> My understanding FWIW is that the passage you quoted simply documents
> a possibly astonishing corner case, where there is a dangling symlink.
Yes, from my tests and from looking at vfs_vnops.c, that seems correct.
> Without O_EXCL, the symlink will be followed and the target file
> created if it doesn't exist. With O_EXCL, open(2) notices a directory
> entry, and errors rather than creating the file. The man page also says
>
> O_EXCL error if create and file exists
>
> and
>
> [EEXIST] O_CREAT and O_EXCL were specified and the file exists.
>
> In other words, there is no documented functionality without O_CREAT.
--
¿Dónde estará ahora mi sobrino Yoghurtu Nghé, que tuvo que huir
precipitadamente de la aldea por culpo de la escasez de rinocerontes?
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[PATCH] Call #'find-coding-system as appropriate in #'write-region.
15 years, 6 months
Aidan Kehoe
Ar an cúigiú lá déag de mí na Samhain, scríobh Vin Shelton:
> Thank you for that fix. It fixed my -debug and non-mule builds, but
> my -mule build is still failing (sorry I didn't mention previously
> that all 3 of my builds were failing). Here's the relevant info from
> the build failure here at work:
Thanks for the report. Does this fix the issue for you? I wasn’t seeing the
problem locally when developing because the ELC files were not rebuilt every
time; you need to have a fresh checkout to provoke the problem.
lisp/ChangeLog addition:
2007-11-15 Aidan Kehoe <kehoea(a)parhasard.net>
* code-files.el (write-region):
Call #'find-coding-system on the (possible) coding system argument
before checking it with #'coding-system-p; the latter function
gives false results when passed coding system names as symbols.
Preserve the old order of determination of the coding system
better.
XEmacs Trunk source patch:
Diff command: cvs -q diff -u
Files affected: lisp/code-files.el
===================================================================
RCS
Index: lisp/code-files.el
===================================================================
RCS file: /pack/xemacscvs/XEmacs/xemacs/lisp/code-files.el,v
retrieving revision 1.23
diff -u -r1.23 code-files.el
--- lisp/code-files.el 2007/11/14 18:51:31 1.23
+++ lisp/code-files.el 2007/11/15 14:32:36
＠＠ -559,14 +559,19 ＠＠
'write-region-pre-hook
start end filename append visit lockname
coding-system-or-mustbenew)
- coding-system
+ (if (and coding-system-or-mustbenew
+ (coding-system-p
+ (find-coding-system coding-system-or-mustbenew)))
+ coding-system-or-mustbenew)
buffer-file-coding-system
(find-file-coding-system-for-write-from-filename filename)))
(if (consp hook-result)
;; One of the `write-region-pre-hook' functions wrote the file.
hook-result
;; The hooks didn't do the work; do it ourselves.
- (setq mustbenew (unless (coding-system-p coding-system-or-mustbenew)
+ (setq hook-result (find-coding-system hook-result)
+ mustbenew (unless (coding-system-p
+ (find-coding-system coding-system-or-mustbenew))
coding-system-or-mustbenew)
coding-system (cond ((coding-system-p hook-result) hook-result)
((null mustbenew) coding-system-or-mustbenew))
--
¿Dónde estará ahora mi sobrino Yoghurtu Nghé, que tuvo que huir
precipitadamente de la aldea por culpo de la escasez de rinocerontes?
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Re: [COMMIT] Import make-temp-name (the functionality of mkstemp(3)) from GNU
15 years, 6 months
Aidan Kehoe
Ar an cúigiú lá déag de mí na Samhain, scríobh Stephen J. Turnbull:
> QUERY
>
> AFAICS your implementation is basically buggy. Some suggestions for
> alternative implementation below.
>
> Aidan Kehoe writes:
> >
> > Yes, the CODING-SYSTEM-OR-MUSTBENEW argument is ugly. No, I don't see a
> > better approach to this which would be compatible with GNU, given that our
> > CODING-SYSTEM argument was already in 21.4.
>
> Where is this argument used with MUSTBENEW semantics?
http://google.com/codesearch?hl=de&lr=&q=file%3A%5C.el+%27excl%5B%5Ea-z%5...
apel/poe.el
gnus/mm-util.el
gnus/nnmaildir.el
ediff-util.el
And in make-temp-file, the function I just merged.
> Wouldn't it be better to keep the CODING-SYSTEM name and simply document
> the additional semantics? I don't think we should encourage use of this
> misfeature in application code.
There’s no other way, beyond using write-region-internal--not portable to
GNU--to access this functionality--avoiding the race condition between
checking for a file’s existence and creating it. It’s ugly, but it is a
positive feature.
> > * code-files.el (write-region):
> > Provide a new arg, CODING-SYSTEM-OR-MUSTBENEW, for compatibility
> > both with GNU (where it has the MUSTBENEW meaning) and earlier
> > XEmacs code (where it has the CODING-SYSTEM meaning).
>
> For the sake of review, please be accurate. This argument is not new,
> it's just been given additional semantics.
OK.
> > * fileio.c (Fwrite_region_internal):
> > Take a new arg, MUSTBENEW, to error if the file to be written
> > already exists.
>
> *gag* It's just wrong to do this at that level. Isn't there some way to
> avoid this? That function is already way overcomplicated.
I’m not sure you’re clear on the point of the MUSTBENEW argument. To make
the check-for-an-existing-file-if-it-doesn’t-exist-create-it operation
atomic¹--which it needs to be to avoid security issues for temporary
files--it needs to be done in the OS kernel. Which means a subr is needed to
expose it to Lisp. Which means it needs to be done at this level.
> As long as we're here ...
>
> > Kludgy feature:
>
> Wouldn't it be less work to mark the *clean* features of this monster?
> :-( How about something like [...]
Yeah, that’s a much nicer docstring.
> BTW, do you insist on 'excl (eg, for gagmacs compatibility)?
Yes.
> Really I'd like to see t instead of 'excl, and restrict to 'ask for the
> query confirmation.
I agree that would be a better interface. It’s unhelpfully incompatible,
though.
> > Index: src/fileio.c
> > ===================================================================
>
> > + if (!NILP (mustbenew) && !EQ (mustbenew, Qexcl))
> > + barf_or_query_if_file_exists (filename, "overwrite", 1, NULL);
>
> Isn't it cleaner to do
>
> if (!NILP (mustbenew))
> barf_or_query_if_file_exists (filename, "overwrite",
> EQ (mustbenew, Qexcl) ? 0 : 1, NULL);
That would be a little friendlier for most people most of the time, yes. I
copied the logic from GNU, though, so I didn’t write it like that.
> > ＠＠ -3433,12 +3448,14 ＠＠
> > desc = -1;
> > if (!NILP (append))
> > {
> > - desc = qxe_open (XSTRING_DATA (fn), O_WRONLY | OPEN_BINARY, 0);
> > + desc = qxe_open (XSTRING_DATA (fn), O_WRONLY | OPEN_BINARY
> > + | (EQ (mustbenew, Qexcl) ? O_EXCL : 0), 0);
>
> Note that on Mac OS X, at least, O_EXCL is documented to have no
> effect unless O_CREAT is also specified. Even if this does work on
> some systems, the user will get a less specific `file-error' rather
> than `file-already-exists'.
FreeBSD: ‘If O_EXCL is set with O_CREAT and the file already exists, open()
returns an error. This may be used to implement a simple exclusive access
locking mechanism. If O_EXCL is set and the last component of the pathname
is a symbolic link, open() will fail even if the symbolic link points to a
non-existent name.’
I read that to mean that O_EXCL does have function when O_CREAT isn’t set,
but I admittedly haven’t written any code to test that understanding.
¹ In the sense that it cannot be interrupted by other processes and resumed.
--
¿Dónde estará ahora mi sobrino Yoghurtu Nghé, que tuvo que huir
precipitadamente de la aldea por culpo de la escasez de rinocerontes?
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