Messages in this thread | | | From | Florian Weimer <> | Subject | Re: /dev/random vs. /dev/urandom | Date | Fri, 07 Jan 2005 20:26:21 +0100 |
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* Ron Peterson:
> When I compile and run the code below, the string of octal characters > generated by reading /dev/random contains long strings of zeroes. I was > under the impression that /dev/random is "more random" than > /dev/urandom, and will block when it runs out of entropy until it > gathers more. It's only when RAND_LEN is on the largish side that these > strings of zeroes appear.
> read( fd, dat, RAND_LEN );
This is the bug. *Always* check the return value of read.
(Try running your program with "strace -e read" for a hint of what's really going on.) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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