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Message-ID: <2f11576a0905170901x41e15f65sf10bb5ee36050d14@mail.gmail.com> Date: Mon, 18 May 2009 01:01:58 +0900 From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> To: Jon Grant <jg@...k.org> Cc: linux-kernel@...r.kernel.org Subject: Re: dd if=/dev/random of=data.bin bs=512 count=1 > Hello > > Issuing this command, I expected to get a file 4096 bytes in size. > Could someone let me know if I have missed something..? Or is there a > problem with using /dev/random this way? > > if I have a count=10 it hangs forever (several hours). > > Changing to use /dev/urandom and it generates the file ok. you already have the answer. /dev/random might blocked, /dev/urandom doesn't. > Please include my email address in replies, as I'm not a member of this list. > > Best regards, Jon > > $ dd if=/dev/random of=data.bin bs=512 count=1 > 0+1 records in > 0+1 records out > 8 bytes (8 B) copied, 4.47366 s, 0.0 kB/s > > $ dd --version > dd (coreutils) 6.10 > > $ uname -a > Linux ubuntu 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:57:59 UTC > 2009 i686 GNU/Linux > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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