28 lines
577 B
Perl
28 lines
577 B
Perl
#!/usr/bin/perl
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#
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# Test program for /dev/urandom
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# Read and display random numbers.
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# This also reads /dev/zero to make sure there is no brokenness there.
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#
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# $Id$
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#
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open(ZERO, "/dev/zero") || die "Cannot open /dev/zero - $!\n";
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for (;;) {
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open(BIN, "/dev/urandom");
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$len = sysread(BIN, $a, 20);
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sysread(ZERO, $b, 20);
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close(BIN);
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if ($len > 0) {
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for ($j = 0; $j < $len; $j += 2) {
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$k = unpack("S", substr($a, $j, 2));
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$z = unpack("S", substr($b, $j, 2));
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$z == 0 || die "/dev/zero is returning non-zero!\n";
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printf("%.4X ", $k);
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}
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printf "\n";
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}
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}
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