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Re: Bug#589103: lsof on Debian FreeBSD

Steven,
Thanks for your quick response and efforts. Crucially when I poke around in /proc/self on asdfasdf.debian.net (or the Hurd exodar.debian.net for that matter) I can find no /proc/sef/fd directory. From what I understand that is crucial to a /proc-basd lsof.
Please feel free to check in your experiments into the collab-maint repository but please could you do it on a "kfreebsd" branch. We could release it to the experiemntal distribution. 


On 20/04/12 03:23, Steven Chamberlain wrote:

Hi!

On 20/04/12 00:45, Nicholas Bamber wrote:

8.6    Why can't Configure create lsof_owner.h for FreeBSD 6 and above?



     ...  Lsof needs to access elements of that
     lockf_owner structure to determine if a lock belongs to the
     process that has a file open.


The goal really is to keep userland tools out of kernel internals to
produce better software;  that's one of many good things I hope will
come as a side effect out of the GNU/kFreeBSD effort.


Since the 'freebsd' dialect of lsof has been relying on kernel internals
for some time, I expect that code will be in pretty bad shape.  You
could try to get what you need from the kfreebsd source but I think it
would be a bad idea.  (A kernel with an incompatible definition might be
booted at any time, and no dpkg dependency can help with that).

However, if the 'linux' dialect does not depend on kernel source code I
think that would make a better starting point.


I tried just now with the freebsd/machine.h and Makefile, but replaced
the symlinks to use dialect/linux code instead, except for node1/2 and
zfs.  That way I even managed to build something, which almost looks
like it works:


steven@kfreebsd-i386:~/lsof-4.81.dfsg.1+wtf$ ./lsof -c lsof
COMMAND   PID   USER   FD   TYPE        DEVICE   SIZE   NODE NAME
lsof    99812 steven  cwd    DIR 92,2340356138     72  15497 /home/steven/lsof-4.81.dfsg.1+wtf
lsof    99812 steven  rtd    DIR          0,71    512      2 /
lsof    99812 steven  txt    REG 92,2340356138 145071  15837 /home/steven/lsof-4.81.dfsg.1+wtf/lsof
lsof    99812 steven  mem    REG           0,0         15837 /home/steven/lsof-4.81.dfsg.1+wtf/lsof (path dev=92,-1954611158)
lsof    99812 steven  mem    REG           0,0        117963 /lib/i386-kfreebsd-gnu/ld-2.13.so (path dev=0,71)
lsof    99812 steven  mem    REG           0,0        213682 /etc/ld.so.cache (path dev=0,71)
lsof    99812 steven  mem    REG           0,0        117953 /lib/libkvm.so.0 (path dev=0,71)
lsof    99812 steven  mem    REG           0,0        117809 /lib/i386-kfreebsd-gnu/i686/cmov/libc-2.13.so (path dev=0,71)
lsof    99812 steven  mem    REG           0,0        117827 /lib/i386-kfreebsd-gnu/libbsd.so.0.3.0 (path dev=0,71)
lsof    99812 steven  mem    REG           0,0        108648 /usr/lib/locale/locale-archive (path dev=164,284950746)
lsof    99812 steven  mem    REG           0,0        117898 /lib/i386-kfreebsd-gnu/i686/cmov/libnss_compat-2.13.so (path dev=0,71)
lsof    99812 steven  mem    REG           0,0        117829 /lib/i386-kfreebsd-gnu/i686/cmov/libnsl-2.13.so (path dev=0,71)
lsof    99812 steven  mem    REG           0,0        117834 /lib/i386-kfreebsd-gnu/i686/cmov/libnss_nis-2.13.so (path dev=0,71)
lsof    99812 steven  mem    REG           0,0        117838 /lib/i386-kfreebsd-gnu/i686/cmov/libnss_files-2.13.so (path dev=0,71)
lsof    99812 steven NOFD                                    /proc/99812/fd (opendir: No such file or directory)
lsof    99813 steven  cwd    DIR 92,2340356138     72  15497 /home/steven/lsof-4.81.dfsg.1+wtf
lsof    99813 steven  rtd    DIR          0,71    512      2 /
lsof    99813 steven  txt    REG 92,2340356138 145071  15837 /home/steven/lsof-4.81.dfsg.1+wtf/lsof
lsof    99813 steven  mem    REG           0,0         15837 /home/steven/lsof-4.81.dfsg.1+wtf/lsof (path dev=92,-1954611158)
lsof    99813 steven  mem    REG           0,0        117963 /lib/i386-kfreebsd-gnu/ld-2.13.so (path dev=0,71)
lsof    99813 steven  mem    REG           0,0        213682 /etc/ld.so.cache (path dev=0,71)
lsof    99813 steven  mem    REG           0,0        117953 /lib/libkvm.so.0 (path dev=0,71)
lsof    99813 steven  mem    REG           0,0        117809 /lib/i386-kfreebsd-gnu/i686/cmov/libc-2.13.so (path dev=0,71)
lsof    99813 steven  mem    REG           0,0        117827 /lib/i386-kfreebsd-gnu/libbsd.so.0.3.0 (path dev=0,71)
lsof    99813 steven  mem    REG           0,0        108648 /usr/lib/locale/locale-archive (path dev=164,284950746)
lsof    99813 steven NOFD                                    /proc/99813/fd (opendir: No such file or directory)


Sadly though we're missing /proc/*/fd in linprocfs as you can see. :(
No pipes, network or unix-style sockets can be listed either.  So it's
not very functional yet, but being able to build something is a start.

To build this I had to change declarations in machine.h to turn off each
bit of code that touches the structs usually guarded by #ifdef _KERNEL
as seen in:
http://fxr.watson.org/fxr/source/sys/file.h?v=FREEBSD9#L40

I'll try to turn this into some sort of diff.  The approach I'd like to
take is to add ifdefs into the linux dialect to make that more portable,
rather than invent a new one.

Regards,
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