info from a process core file.
So now one can run procstat(1) on a process core e.g. to get a list of
files opened by a process when it crashed:
root@lisa:/ # procstat -f /root/vi.core
PID COMM FD T V FLAGS REF OFFSET PRO NAME
658 vi text v r r-------- - - - /usr/bin/vi
658 vi ctty v c rw------- - - - /dev/pts/0
658 vi cwd v d r-------- - - - /root
658 vi root v d r-------- - - - /
658 vi 0 v c rw------- 11 3208 - /dev/pts/0
658 vi 1 v c rw------- 11 3208 - /dev/pts/0
658 vi 2 v c rw------- 11 3208 - /dev/pts/0
658 vi 3 v r r----n-l- 1 0 - /tmp/vi.0AYKz3Lps7
658 vi 4 v r rw------- 1 0 - /var/tmp/vi.recover/vi.GaGYsz
658 vi 5 v r rw------- 1 0 - -
PR: kern/173723
Suggested by: jhb
MFC after: 1 month
capability mode and capabilities.
Right now no attempt is made to unwrap capabilities when operating on
a crashdump, so further refinement is required.
Approved by: re (bz)
Sponsored by: Google Inc
file and processes information retrieval from the running kernel via sysctl
in the form of new library, libprocstat. The library also supports KVM backend
for analyzing memory crash dumps. Both procstat(1) and fstat(1) utilities have
been modified to take advantage of the library (as the bonus point the fstat(1)
utility no longer need superuser privileges to operate), and the procstat(1)
utility is now able to display information from memory dumps as well.
The newly introduced fuser(1) utility also uses this library and able to operate
via sysctl and kvm backends.
The library is by no means complete (e.g. KVM backend is missing vnode name
resolution routines, and there're no manpages for the library itself) so I
plan to improve it further. I'm commiting it so it will get wider exposure
and review.
We won't be able to MFC this work as it relies on changes in HEAD, which
was introduced some time ago, that break kernel ABI. OTOH we may be able
to merge the library with KVM backend if we really need it there.
Discussed with: rwatson
of the missing functionality from procfs(4) and new functionality for
monitoring and debugging specific processes. procstat(1) operates in
the following modes:
-b Display binary information for the process.
-c Display command line arguments for the process.
-f Display file descriptor information for the process.
-k Display the stacks of kernel threads in the process.
-s Display security credential information for the process.
-t Display thread information for the process.
-v Display virtual memory mappings for the process.
Further revision and modes are expected.
Testing, ideas, etc: cognet, sam, Skip Ford <skip at menantico dot com>
Wesley Shields <wxs at atarininja dot org>
