Hi,
Using `openssl rand' with version 0.9.8g-16ubuntu3.1 I find it ignores
SIGPIPE.
$ strace -s 3 -e write openssl rand 40960 |
> dd bs=1 count=1 of=/dev/null
write(1, "Tgz"..., 4096) = 4096
write(1, "e\214\252"..., 4096) = 4096
write(1, "\202\244\343"..., 4096) = 4096
write(1, "k\21\16"..., 4096) = 4096
write(1, "\27\342\340"..., 4096) = 4096
write(1, "\4b\26"..., 4096) = 4096
write(1, "ZS\273"..., 4096) = 4096
1+0 records in
1+0 records out
1 byte (1 B) copied, 0.01789 s, 0.1 kB/s
write(1, "\341\341\200"..., 4096) = -1 EPIPE (Broken pipe)
--- SIGPIPE (Broken pipe) @ 0 (0) ---
write(1, "x\214\30"..., 4096) = -1 EPIPE (Broken pipe)
--- SIGPIPE (Broken pipe) @ 0 (0) ---
write(3, "hz\21"..., 1024) = 1024
$
This means I can't do
while openssl rand $bignum; :; done |
dd bs=4096 of=/dev/foo
The first invocation of openssl can take ages writing the remaining
$bignum bytes to a closed pipe and then, because openssl hasn't left the
default action of SIGPIPE, terminate, in place it exits without error
and the while-loop starts it again.
What's the thinking behind this undocumented behaviour? It lessens the
utility of the command and makes it an ill-fit for the Unix way of doing
things.
Cheers,
Ralph.
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