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Date: Sun, 5 May 2013 11:16:55 +0200 (CEST)
From: Jens <jensl@...s.mine.nu>
To: musl@...ts.openwall.com
Subject: procfs stdio writev problem
Hello!
I've noticed a problem when using bash linked with musl.
laas:~# echo 60 > /proc/sys/kernel/panic
-su: echo: write error: Invalid argument
laas:~# cat t.sh
#!/bin/bash
echo 60 > /proc/sys/kernel/panic
laas:~# strace -f t.sh
...
writev(1, [{"60", 2}, {"\n", 1}], 2) = 2
writev(1, [{"", 0}, {"\n", 1}], 2) = -1 EINVAL (Invalid argument)
I'm guessing that musl uses writev in its stdio implementation.
And I think the error is due to a simplistic implementation in procfs,
that parses each write on its own, and that the writev is split into
several writes.
This is with linux kernel 3.6.0 btw.
I have no idea if something can and should be done about this, but likely
somebody else will run into the same problem.
Regards,
Jens
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