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posix shm: add shm_get_path(9)

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(cherry picked from commit bda73e441f)
This commit is contained in:
Konstantin Belousov 2024-10-07 04:44:49 +03:00
parent ec35a9c65d
commit 64de7b789b
2 changed files with 32 additions and 0 deletions
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31
sys/kern/uipc_shm.c
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@ -2196,3 +2196,34 @@ sys_shm_open2(struct thread *td, struct shm_open2_args *uap)
return (kern_shm_open2(td, uap->path, uap->flags, uap->mode,
uap->shmflags, NULL, uap->name));
}
int
shm_get_path(struct vm_object *obj, char *path, size_t sz)
{
struct shmfd *shmfd;
int error;
error = 0;
shmfd = NULL;
sx_slock(&shm_dict_lock);
VM_OBJECT_RLOCK(obj);
if ((obj->flags & OBJ_POSIXSHM) == 0) {
error = EINVAL;
} else {
if (obj->type == shmfd_pager_type)
shmfd = obj->un_pager.swp.swp_priv;
else if (obj->type == OBJT_PHYS)
shmfd = obj->un_pager.phys.phys_priv;
if (shmfd == NULL) {
error = ENXIO;
} else {
strlcpy(path, shmfd->shm_path == NULL ? "anon" :
shmfd->shm_path, sz);
}
}
if (error != 0)
path[0] = '\0';
VM_OBJECT_RUNLOCK(obj);
sx_sunlock(&shm_dict_lock);
return (error);
}

1
sys/sys/mman.h
View file

@ -310,6 +310,7 @@ void shm_drop(struct shmfd *shmfd);
int shm_dotruncate(struct shmfd *shmfd, off_t length);
bool shm_largepage(struct shmfd *shmfd);
void shm_remove_prison(struct prison *pr);
int shm_get_path(struct vm_object *obj, char *path, size_t sz);
extern struct fileops shm_ops;