On Thursday 17 March 2016, Benno Schulenberg wrote:
> On Thu, Mar 17, 2016, at 13:50, Ruediger Meier wrote:
> > I have some guesses about "ipcs" and "fallocate" but some more
> > questions:
> >
> > 1. Which kernel version?
>
> 2.6.32
Hehe my guess was right.
I've noticed already 2 years ago on Debian 6 that our scanf code in
ipc_shm_get_info() is not compatible to this kernel version. (2.6.34
worked AFAIR.)
Could you show us
$ cat /proc/sysvipc/shm
Maybe it's easy to fix.
Generally I think we should make a statement about "what is the minimum
kernel version" for util-linux. Two years ago I decided for myself that
I should fix bugs for newer kernels first. On the other hand 2.6.32
would have been worth to support because it was officially maintained
from 2009 until last month!
> > 2. Which file system? (findmnt -n -o FSTYPE -T tests/output)
>
> ext3
ext3 is not supported but the system call should return an error and the
test should look like this:
misc: fallocate ... SKIPPED ('ext3' not supported)
I guess the kernel syscall does not return error thus our fallocate
succeed but the file is empty. It's a kernel bug we can't fix. Or
should we add a stat() call to validate the syscall?
> > 3. Is /proc mounted?
>
> $ ./findmnt -n -t proc
> /proc none proc rw,nosuid,nodev,noexec,relatime
>
> > 4 grep "FALL" config.h
>
> #define HAVE_FALLOCATE 1
> #define HAVE_LINUX_FALLOC_H 1
>
> Benno
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