On 10/16/2013 02:16:47 PM, William Haddon wrote:
How exactly should this behave? I haven't been able to decipher what
POSIX
has to say about the subject. The GNU version executes the command
with no
arguments, so that "xargs" with blank input is equivalent to "echo"
and
"xargs ls" with blank input is equivalent to "ls".
In cases like this I test existing implementations (usually busybox,
what's installed in ubuntu, and my old Red Hat 9 qemu image from 2003)
to see what "expected Linux behavior" is.
For xargs, I also have a pending todo item: Rich Felker pointed out
that our whitespace and quote handling behavior doesn't match the
horrible posix corner cases that predate the -0 option. (Something
about backslash escapes and multiline processing, I forget.) There's
also a requirement ot leave 2048 bytes of environment variable space,
which I don't think it's currently doing...
I need to reread the spec for fiddlybits and do another pass...
Toybox currently appears to do nothing, but actually forks a child
process
which silently seg-faults as a result of calling xexec() with argv[0]
== NULL.
Ok, that's wrong. :)
Patching toybox to implement the GNU behavior fixes a lot of scripts
on my
test system that broke when I switched the xargs implementation from
busybox
to toybox, including the Linux build scripts.
Sounds good. I'll take a look, but have to catch a bus in something
like 3 minutes...
Thanks,
Rob
_______________________________________________
Toybox mailing list
Toybox@lists.landley.net
http://lists.landley.net/listinfo.cgi/toybox-landley.net
