GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 5.5 |
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rngd(8) |
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rngd − Check and feed random data from hardware device to kernel random device
rngd [−b, −−background] [−f, −−foreground] [−o, −−random-device=file] [−r, −−rng-device=file] [−s, −−random-step=nnn] [−W, −−fill-watermark=nnn] [−t, −−timeout=nnn] [−?, −−help] [−V, −−version]
This daemon feeds data from a random number generator to the kernel’s random number entropy pool, after first checking the data to ensure that it is properly random.
The −f or −−foreground options can be used to tell rngd to avoid forking on startup. This is typically used for debugging. The −f or −−foreground options, which fork and put rngd into the background automatically, are the default.
The −r or −−rng-device options can be used to select an alternate source of input, besides the default /dev/hwrandom. The −o or −−random-device options can be used to select an alternate entropy output device, besides the default /dev/random. Note that this device must support the Linux kernel /dev/random ioctl API.
FIXME: document random-step and timeout
−b, −−background
Become a daemon (default)
−f, −−foreground
Do not fork and become a daemon
−o file, −−random-device=file
Kernel device used for random number output (default: /dev/random)
−r file, −−rng-device=file
Kernel device used for random number input (default: /dev/hwrandom)
−s nnn, −−random-step=nnn
Number of bytes written to random-device at a time (default: 64)
−W n, −−fill−watermark=nnn
Once we start doing it, feed entropy to random-device until at least fill-watermark bits of entropy are available in its entropy pool (default: 2048). Setting this too high will cause rngd to dominate the contents of the entropy pool. Low values will hurt system performance during entropy starves. Do not set fill-watermark above the size of the entropy pool (usually 4096 bits).
−t nnn, −−timeout=nnn
Interval written to random-device when the entropy pool is full, in seconds, or 0 to disable (default: 60)
−?, −−help
Give a short summary of all program options.
−V, −−version
Print program version
Philipp Rumpf
Jeff Garzik − jgarzik@pobox.com
Matt Sottek
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rngd(8) | |