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Re: Should Emacs provide a uuid function?
From: |
Leo |
Subject: |
Re: Should Emacs provide a uuid function? |
Date: |
Mon, 09 May 2011 14:29:20 +0800 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.3.50 (Mac OS X 10.6.7) |
On 2011-04-26 03:52 +0800, Chong Yidong wrote:
> Ken Raeburn <address@hidden> writes:
>
>> I wouldn't consider the elisp 'random' function to be remotely good
>> enough though.
>
> You mean, because of the way it's seeded? I guess we can (should?)
> improve it to use /dev/random where that's available.
I think this is a good proposal. It seems everything can be built on top
of the ability to get some bytes from /dev/random or /dev/urandom.
For example:
(defun secure-random-bytes (n)
(let ((file (cond
((file-exists-p "/dev/random") "/dev/random")
((file-exists-p "/dev/urandom") "/dev/urandom")
(t (error "Secure random device not available")))))
(with-temp-buffer
(set-buffer-multibyte nil)
(insert-file-contents file nil 0 n)
(buffer-string))))
After patching insert-file-contents to support CHAR DEV.
diff --git a/src/fileio.c b/src/fileio.c
index c6e93ceb..c8ab7ef6 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -3275,7 +3275,7 @@ variable `last-coding-system-used' to the coding system
actually used. */)
/* This code will need to be changed in order to work on named
pipes, and it's probably just not worth it. So we should at
least signal an error. */
- if (!S_ISREG (st.st_mode))
+ if (!S_ISREG (st.st_mode) && !S_ISCHR (st.st_mode))
{
not_regular = 1;
Leo
- Re: Should Emacs provide a uuid function?, Stephen J. Turnbull, 2011/05/01
- Re: Should Emacs provide a uuid function?,
Leo <=
- Re: Should Emacs provide a uuid function?, Eli Zaretskii, 2011/05/09
- Re: Should Emacs provide a uuid function?, Stefan Monnier, 2011/05/09
- Re: Should Emacs provide a uuid function?, Eli Zaretskii, 2011/05/09
- Re: Should Emacs provide a uuid function?, Stefan Monnier, 2011/05/09
- Re: Should Emacs provide a uuid function?, Eli Zaretskii, 2011/05/09
- Re: Should Emacs provide a uuid function?, Stefan Monnier, 2011/05/09
- Re: Should Emacs provide a uuid function?, Eli Zaretskii, 2011/05/09