Similar to 233760 and 236717, export some more useful info about the

kernel-based POSIX semaphore descriptors to userland via procstat(1) and
fstat(1):
- Change sem file descriptors to track the pathname they are associated
  with and add a ksem_info() method to copy the path out to a
  caller-supplied buffer.
- Use the fo_stat() method of shared memory objects and ksem_info() to
  export the path, mode, and value of a semaphore via struct kinfo_file.
- Add a struct semstat to the libprocstat(3) interface along with a
  procstat_get_sem_info() to export the mode and value of a semaphore.
- Teach fstat about semaphores and to display their path, mode, and value.

MFC after:	2 weeks

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/libprocstat/libprocstat.h b/lib/libprocstat/libprocstat.h
index 2c2662d..65a5eb9 100644
--- a/lib/libprocstat/libprocstat.h
+++ b/lib/libprocstat/libprocstat.h
@@ -133,6 +133,10 @@ struct pipestat {
 	uint64_t	addr;
 	uint64_t	peer;
 };
+struct semstat {
+	uint32_t	value;
+	uint16_t	mode;
+};
 struct shmstat {
 	uint64_t	size;
 	uint16_t	mode;
@@ -177,6 +181,8 @@ int	procstat_get_pipe_info(struct procstat *procstat, struct filestat *fst,
     struct pipestat *pipe, char *errbuf);
 int	procstat_get_pts_info(struct procstat *procstat, struct filestat *fst,
     struct ptsstat *pts, char *errbuf);
+int	procstat_get_sem_info(struct procstat *procstat, struct filestat *fst,
+    struct semstat *sem, char *errbuf);
 int	procstat_get_shm_info(struct procstat *procstat, struct filestat *fst,
     struct shmstat *shm, char *errbuf);
 int	procstat_get_socket_info(struct procstat *procstat, struct filestat *fst,