diff options
Diffstat (limited to 'sys/kern/sysv_sem.c')
| -rw-r--r-- | sys/kern/sysv_sem.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/sys/kern/sysv_sem.c b/sys/kern/sysv_sem.c index 6a668906ebd0..d8c10f837105 100644 --- a/sys/kern/sysv_sem.c +++ b/sys/kern/sysv_sem.c @@ -1574,6 +1574,39 @@ sysctl_sema(SYSCTL_HANDLER_ARGS) return (error); } +int +kern_get_sema(struct thread *td, struct semid_kernel **res, size_t *sz) +{ + struct prison *pr, *rpr; + struct semid_kernel *psemak; + int i, mi; + + *sz = mi = seminfo.semmni; + if (res == NULL) + return (0); + + pr = td->td_ucred->cr_prison; + rpr = sem_find_prison(td->td_ucred); + *res = malloc(sizeof(struct semid_kernel) * mi, M_TEMP, M_WAITOK); + for (i = 0; i < mi; i++) { + psemak = &(*res)[i]; + mtx_lock(&sema_mtx[i]); + if ((sema[i].u.sem_perm.mode & SEM_ALLOC) == 0 || + rpr == NULL || sem_prison_cansee(rpr, &sema[i]) != 0) + bzero(psemak, sizeof(*psemak)); + else { + *psemak = sema[i]; + if (psemak->cred->cr_prison != pr) + psemak->u.sem_perm.key = IPC_PRIVATE; + } + mtx_unlock(&sema_mtx[i]); + psemak->u.__sem_base = NULL; + psemak->label = NULL; + psemak->cred = NULL; + } + return (0); +} + static int sem_prison_check(void *obj, void *data) { |