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 unlink(FAR const char *pathname)
{
FAR struct inode *inode;
const char *relpath = NULL;
int errcode;
int ret;
/* Get an inode for this file */
inode = inode_find(pathname, &relpath);
if (!inode)
{
/* There is no inode that includes in this path */
errcode = ENOENT;
goto errout;
}
#ifndef CONFIG_DISABLE_MOUNTPOINT
/* Check if the inode is a valid mountpoint. */
if (INODE_IS_MOUNTPT(inode) && inode->u.i_mops)
{
/* Perform the unlink operation using the relative path at the
* mountpoint.
*/
if (inode->u.i_mops->unlink)
{
ret = inode->u.i_mops->unlink(inode, relpath);
if (ret < 0)
{
errcode = -ret;
goto errout_with_inode;
}
}
else
{
errcode = ENOSYS;
goto errout_with_inode;
}
}
else
#endif
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
/* If this is a "dangling" pseudo-file node (i.e., it has operations) then rm
* should remove the node.
*/
if (!INODE_IS_SPECIAL(inode) && inode->u.i_ops)
{
/* If this is a pseudo-file node (i.e., it has no operations)
* then rmdir should remove the node.
*/
if (inode->u.i_ops)
{
inode_semtake();
/* Refuse to unlink the inode if it has children. I.e., if it is
* functioning as a directory and the directory is not empty.
*/
if (inode->i_child != NULL)
{
errcode = ENOTEMPTY;
inode_semgive();
goto errout_with_inode;
}
/* Remove the old inode. Because we hold a reference count on the
* inode, it will not be deleted now. It will be deleted when all
* of the references to to the inode have been released (perhaps
* when inode_release() is called below). inode_remove() will
* return -EBUSY to indicate that the inode was not deleted now.
*/
ret = inode_remove(pathname);
inode_semgive();
if (ret < 0 && ret != -EBUSY)
{
errcode = -ret;
goto errout_with_inode;
}
}
else
{
errcode = EISDIR;
goto errout_with_inode;
}
}
else
#endif
{
errcode = ENXIO;
goto errout_with_inode;
}
/* Successfully unlinked */
inode_release(inode);
return OK;
errout_with_inode:
inode_release(inode);
errout:
set_errno(errcode);
return ERROR;
}