Export some more useful info about shared memory objects to userland

via procstat(1) and fstat(1):
- Change shm file descriptors to track the pathname they are associated
  with and add a shm_path() method to copy the path out to a caller-supplied
  buffer.
- Use the fo_stat() method of shared memory objects and shm_path() to
  export the path, mode, and size of a shared memory object via
  struct kinfo_file.
- Add a struct shmstat to the libprocstat(3) interface along with a
  procstat_get_shm_info() to export the mode and size of a shared memory
  object.
- Change procstat to always print out the path for a given object if it
  is valid.
- Teach fstat about shared memory objects and to display their path,
  mode, and size.

MFC after:	2 weeks

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/libprocstat/Versions.def b/lib/libprocstat/Versions.def
index d69f5c9..ed958db 100644
--- a/lib/libprocstat/Versions.def
+++ b/lib/libprocstat/Versions.def
@@ -3,3 +3,8 @@
 # This version was first added to 9.0-current.
 FBSD_1.2 {
 };
+
+# This version was first added to 10.0-current.
+FBSD_1.3 {
+} FBSD_1.2;
+