Date: Fri, 12 Oct 2012 02:12:53 +0000 (UTC) From: Eitan Adler <eadler@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-7@freebsd.org Subject: svn commit: r241477 - stable/7/lib/libc/stdlib Message-ID: <201210120212.q9C2Creo023983@svn.freebsd.org>
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Author: eadler Date: Fri Oct 12 02:12:53 2012 New Revision: 241477 URL: http://svn.freebsd.org/changeset/base/241477 Log: MFC r241373: Remove undefined behavior from sranddev() and srandomdev(). This doesn't actually work with any modern C compiler: In particular, both clang and modern gcc verisons silently elide any xor operation with 'junk'. Approved by: cperciva (implicit) Modified: stable/7/lib/libc/stdlib/rand.c Directory Properties: stable/7/lib/libc/ (props changed) Modified: stable/7/lib/libc/stdlib/rand.c ============================================================================== --- stable/7/lib/libc/stdlib/rand.c Fri Oct 12 02:12:53 2012 (r241476) +++ stable/7/lib/libc/stdlib/rand.c Fri Oct 12 02:12:53 2012 (r241477) @@ -130,10 +130,9 @@ sranddev() if (!done) { struct timeval tv; - unsigned long junk; gettimeofday(&tv, NULL); - srand((getpid() << 16) ^ tv.tv_sec ^ tv.tv_usec ^ junk); + srand((getpid() << 16) ^ tv.tv_sec ^ tv.tv_usec); } }
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