int inode_stat(FAR struct inode *inode, FAR struct stat *buf)
{
DEBUGASSERT(inode != NULL && buf != NULL);
memset(buf, 0, sizeof(*buf));
if (INODE_IS_SPECIAL(inode)) {
#if defined(CONFIG_FS_NAMED_SEMAPHORES)
if (INODE_IS_NAMEDSEM(inode)) {
buf->st_mode = S_IFSEM;
} else
#endif
#if !defined(CONFIG_DISABLE_MQUEUE)
if (INODE_IS_MQUEUE(inode)) {
buf->st_mode = S_IFMQ;
} else
#endif
{
}
} else if (inode->u.i_ops != NULL) {
/* Determine read/write privileges based on the existence of read
* and write methods.
*/
if (inode->u.i_ops->read) {
buf->st_mode = S_IROTH | S_IRGRP | S_IRUSR;
}
if (inode->u.i_ops->write) {
buf->st_mode |= S_IWOTH | S_IWGRP | S_IWUSR;
}
/* Determine the type of the inode */
if (INODE_IS_MOUNTPT(inode)) {
buf->st_mode |= S_IFDIR;
} else if (INODE_IS_BLOCK(inode)) {
/* What is if also has child inodes? */
buf->st_mode |= S_IFBLK;
} else /* if (INODE_IS_DRIVER(inode)) */ {
/* What is it if it also has child inodes? */
buf->st_mode |= S_IFCHR;
}
} else {
/* If it has no operations, then it must just be a intermediate
* node in the inode tree. It is something like a directory.
* We'll say that all pseudo-directories are read-able but not
* write-able.
*/
buf->st_mode |= S_IFDIR | S_IROTH | S_IRGRP | S_IRUSR;
}
return OK;
}
int sem_unlink(FAR const char *name)
{
FAR struct inode *inode;
FAR const char *relpath = NULL;
char fullpath[MAX_SEMPATH];
int errcode;
int ret;
/* Get the full path to the semaphore */
snprintf(fullpath, MAX_SEMPATH, CONFIG_FS_NAMED_SEMPATH "/%s", name);
/* Get the inode for this semaphore. */
sched_lock();
inode = inode_find(fullpath, &relpath);
if (!inode)
{
/* There is no inode that includes in this path */
errcode = ENOENT;
goto errout;
}
/* Verify that what we found is, indeed, a semaphore */
if (!INODE_IS_NAMEDSEM(inode))
{
errcode = ENXIO;
goto errout_with_inode;
}
/* Refuse to unlink the inode if it has children. I.e., if it is
* functioning as a directory and the directory is not empty.
*/
inode_semtake();
if (inode->i_child != NULL)
{
errcode = ENOTEMPTY;
goto errout_with_semaphore;
}
/* Remove the old inode from the tree. Because we hold a reference count
* on the inode, it will not be deleted now. This will set the
* FSNODEFLAG_DELETED bit in the inode flags.
*/
ret = inode_remove(fullpath);
/* inode_remove() should always fail with -EBUSY because we hae a reference
* on the inode. -EBUSY means taht the inode was, indeed, unlinked but
* thatis could not be freed because there are refrences.
*/
DEBUGASSERT(ret >= 0 || ret == -EBUSY);
UNUSED(ret);
/* Now we do not release the reference count in the normal way (by calling
* inode release. Rather, we call sem_close(). sem_close will decrement
* the reference count on the inode. But it will also free the semaphore
* if that reference count decrements to zero. Since we hold one reference,
* that can only occur if the semaphore is not in-use.
*/
inode_semgive();
ret = sem_close((FAR sem_t *)inode->u.i_nsem);
sched_unlock();
return ret;
errout_with_semaphore:
inode_semgive();
errout_with_inode:
inode_release(inode);
errout:
set_errno(errcode);
sched_unlock();
return ERROR;
}