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comparison util/random.lua @ 12446:e54b8a5e35ad 0.12

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util.random: Test whether util.crand works before using it (fix #1734) util.crand can be configured at compile time to use the Linux getrandom() system call, available from Linux 3.17, but it is still possible to load it with an older kernel lacking that system call, where attempting to use it throws an ENOSYS error. By testing for this on load we can fall back to /dev/urandom in this case.
author Kim Alvefur <zash@zash.se>
date Sat, 02 Apr 2022 16:33:27 +0200
parents af8c514e5cf7
children d10957394a3c
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12444:b33558969b3e 12446:e54b8a5e35ad
5 -- This project is MIT/X11 licensed. Please see the 5 -- This project is MIT/X11 licensed. Please see the
6 -- COPYING file in the source package for more information. 6 -- COPYING file in the source package for more information.
7 -- 7 --
8 8
9 local ok, crand = pcall(require, "util.crand"); 9 local ok, crand = pcall(require, "util.crand");
10 if ok then return crand; end 10 if ok and pcall(crand.bytes, 1) then return crand; end
11 11
12 local urandom, urandom_err = io.open("/dev/urandom", "r"); 12 local urandom, urandom_err = io.open("/dev/urandom", "r");
13 13
14 local function bytes(n) 14 local function bytes(n)
15 local data, err = urandom:read(n); 15 local data, err = urandom:read(n);