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, 2 insertions, 8 deletions

diff --git a/usr.bin/procstat/procstat_files.c b/usr.bin/procstat/procstat_files.c
index 84737a1..4c1905c 100644
--- a/usr.bin/procstat/procstat_files.c
+++ b/usr.bin/procstat/procstat_files.c
@@ -440,13 +440,6 @@ procstat_files(struct procstat *procstat, struct kinfo_proc *kipp)
 			printf(" ");
 		}
 		switch (fst->fs_type) {
-		case PS_FST_TYPE_VNODE:
-		case PS_FST_TYPE_FIFO:
-		case PS_FST_TYPE_PTS:
-			printf("%-3s ", "-");
-			printf("%-18s", fst->fs_path != NULL ? fst->fs_path : "-");
-			break;
-
 		case PS_FST_TYPE_SOCKET:
 			error = procstat_get_socket_info(procstat, fst, &sock, NULL);
 			if (error != 0)
@@ -477,7 +470,8 @@ procstat_files(struct procstat *procstat, struct kinfo_proc *kipp)
 			break;
 
 		default:
-			printf("%-18s", "-");
+			printf("%-3s ", "-");
+			printf("%-18s", fst->fs_path != NULL ? fst->fs_path : "-");
 		}
 
 		printf("\n");