Am 4/19/2012 8:03, schrieb Jeff King:
> mkfifo fd
> yes >fd &
> pid=$!
> {
> read line
> echo $line
> cat <fd &
> } <fd
> sleep 1
> kill $pid
> wait $pid
> rm -f fd
...
> Hmm. Yeah, if you strace the cat, it gets an immediate EOF. And even
> weirder, I notice this in the strace output:
>
> clone(...)
> close(0) = 0
> open("/dev/null", O_RDONLY) = 0
> ...
> execve("/bin/cat", ["cat"], [/* 50 vars */]) = 0
>
> What? The shell is literally redirecting the cat process's stdin from
> /dev/null. I'm totally confused.
You don't have to be; it's mandated by POSIX:
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_03_02
-- Hannes
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