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author | jhb <jhb@FreeBSD.org> | 2012-04-01 18:22:48 +0000 |
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committer | jhb <jhb@FreeBSD.org> | 2012-04-01 18:22:48 +0000 |
commit | 506e2f15b93a1584a9103782c48037c858a30609 (patch) | |
tree | c2db61e497320454ff8abdab4b6faede73162985 /sys/kern/uipc_shm.c | |
parent | d5bc632dfb8beb870403790342bc3e9573c4f038 (diff) | |
download | FreeBSD-src-506e2f15b93a1584a9103782c48037c858a30609.zip FreeBSD-src-506e2f15b93a1584a9103782c48037c858a30609.tar.gz |
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
Diffstat (limited to 'sys/kern/uipc_shm.c')
-rw-r--r-- | sys/kern/uipc_shm.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/sys/kern/uipc_shm.c b/sys/kern/uipc_shm.c index ce7c722..7f75bdc 100644 --- a/sys/kern/uipc_shm.c +++ b/sys/kern/uipc_shm.c @@ -468,6 +468,7 @@ shm_insert(char *path, Fnv32_t fnv, struct shmfd *shmfd) map->sm_path = path; map->sm_fnv = fnv; map->sm_shmfd = shm_hold(shmfd); + shmfd->shm_path = path; LIST_INSERT_HEAD(SHM_HASH(fnv), map, sm_link); } @@ -490,6 +491,7 @@ shm_remove(char *path, Fnv32_t fnv, struct ucred *ucred) FREAD | FWRITE); if (error) return (error); + map->sm_shmfd->shm_path = NULL; LIST_REMOVE(map, sm_link); shm_drop(map->sm_shmfd); free(map->sm_path, M_SHMFD); @@ -844,3 +846,15 @@ shm_unmap(struct file *fp, void *mem, size_t size) VM_OBJECT_UNLOCK(obj); return (0); } + +void +shm_path(struct shmfd *shmfd, char *path, size_t size) +{ + + if (shmfd->shm_path == NULL) + return; + sx_slock(&shm_dict_lock); + if (shmfd->shm_path != NULL) + strlcpy(path, shmfd->shm_path, size); + sx_sunlock(&shm_dict_lock); +} |