From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 6751 invoked by alias); 9 Aug 2016 20:36:15 -0000 Mailing-List: contact zsh-workers-help@zsh.org; run by ezmlm Precedence: bulk X-No-Archive: yes List-Id: Zsh Workers List List-Post: List-Help: X-Seq: 39012 Received: (qmail 15796 invoked from network); 9 Aug 2016 20:36:15 -0000 X-Qmail-Scanner-Diagnostics: from mail-qk0-f170.google.com by f.primenet.com.au (envelope-from , uid 7791) with qmail-scanner-2.11 (clamdscan: 0.99.2/21882. spamassassin: 3.4.1. Clear:RC:0(209.85.220.170):SA:0(0.0/5.0):. Processed in 0.137701 secs); 09 Aug 2016 20:36:15 -0000 X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on f.primenet.com.au X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=FREEMAIL_FROM,SPF_PASS, T_DKIM_INVALID autolearn=unavailable autolearn_force=no version=3.4.1 X-Envelope-From: mikachu@gmail.com X-Qmail-Scanner-Mime-Attachments: | X-Qmail-Scanner-Zip-Files: | Received-SPF: pass (ns1.primenet.com.au: SPF record at _netblocks.google.com designates 209.85.220.170 as permitted sender) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=Stt/Y4Of7xQ9YrQvUwnK9tqpnjiho/pRe3q+CrwJsPA=; b=dcYQAsfMUzdch2ysqX/shR7eN7bYCOm3rlRO7t6PAb5gFuJMbWoyT6GZHLtescgKuc Rp7APXuGYbL3STKikHhe6KDCPePLojhwoFeKfr9SiSo+PN4ClAeBaQmrBy3dqAjx6HZS jLG4P2hMV/goioBtFdzvUZiyXSQu3XlejFCqDLNBapRs+VQQBVn9g43KcOIXtmCVP0uv 0ZRJy3lmENhqZss+clIfm3K4S3lF8gBpTDIqsQcCKkBzVeHnlKPKfdCRR+ewJvfji76t rYBAIScC0oREmTTdwrrHBO55v+CZG0LioV1dt7vSf/gM1MZNIuAfhxlukQ10LbRVQ3AN Ak3g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=Stt/Y4Of7xQ9YrQvUwnK9tqpnjiho/pRe3q+CrwJsPA=; b=krTKlqXs2sTEgvpM7BHAPL1QcyDgVkOcEVHHqshvcGy53vWqTQtHX6F43LetAmnpuM F2+RKHJ34XsQWtLkyQ6IsgO9qjXwu4z+CxZgw3/jQF2pP9+wCznpPZnTkdDrh+BYtwd/ TYxrzBUDbRWYfP0E/WebkGHvZZLaZDPMZpL7FwHodAXJ1WVET8fJqCMm1I2fi1RmdeTj NtG58vV3pWQYxfl7mI6wCk5l+nrdIwWg85+dIm/tNd0K7ezikTQ5qWl7pLh5Szs3pAvk 8QPDBCDOPwhxyd7SSJ9QoDjQZ4FliIxZ6qIEYmo9EXrWdg0sGS4lKNs3oNFuk9Xgp3EB sirg== X-Gm-Message-State: AEkooutjUmL1RvfDDZrfmM8SK8i0gBi+/JxfHedp0zRnwwJoD7aJ2V4Dkv5j+mlbNXoJE2y48+gx/czjeNHEQA== X-Received: by 10.55.19.23 with SMTP id d23mr363962qkh.230.1470774498117; Tue, 09 Aug 2016 13:28:18 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <20160809201539.25399-1-mikachu@gmail.com> References: <20160809201539.25399-1-mikachu@gmail.com> From: Mikael Magnusson Date: Tue, 9 Aug 2016 22:28:17 +0200 Message-ID: Subject: Re: PATCH: OpenBSD requires special hoops to get correct random numbers To: zsh workers Content-Type: text/plain; charset=UTF-8 On Tue, Aug 9, 2016 at 10:15 PM, Mikael Magnusson wrote: > Apparently there was a change in OpenBSD fairly recently[1] that > causes random numbers generated by rand() to ignore the value passed to > srand(). Since zsh guarantees repeatable sequences we have to use their > non-standard interface to continue providing this guarantee. > > If someone has an opinion on where to stick the #define or if the two > call-sites should be explicitly #ifdef'd, let me know. > > At home, > % zsh -c 'repeat 3 { RANDOM=5; echo $RANDOM }' > 23835 > 23835 > 23835 > On OpenBSD system, > % zsh -c 'repeat 3 { RANDOM=5; echo $RANDOM }' > 24254 > 32257 > 4161 > On OpenBSD system with patch applied, > % Src/zsh -c 'repeat 3 { RANDOM=5; echo $RANDOM }' > 14426 > 14426 > 14426 > > [1] http://marc.info/?l=openbsd-cvs&m=141807513728073&w=2 (The rand48 zsh math function uses erand48() internally, and that is unaffected by the change.) -- Mikael Magnusson