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/** Perform a path lookup.
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/** Perform a path lookup.
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 *
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 *
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 * @param path      Path to be resolved; it needn't be an ASCIIZ string.
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 * @param path      Path to be resolved; it needn't be an ASCIIZ string.
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 * @param len       Number of path characters pointed by path.
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 * @param len       Number of path characters pointed by path.
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 * @param lflag     Flags to be used during lookup.
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 * @param result    Empty structure where the lookup result will be stored.
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 * @param result    Empty structure where the lookup result will be stored.
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 * @param altroot   If non-empty, will be used instead of rootfs as the root
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 * @param altroot   If non-empty, will be used instead of rootfs as the root
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 *          of the whole VFS tree.
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 *          of the whole VFS tree.
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 *
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 *
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 * @return      EOK on success or an error code from errno.h.
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 * @return      EOK on success or an error code from errno.h.
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 */
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 */
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int vfs_lookup_internal(char *path, size_t len, vfs_lookup_res_t *result,
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int vfs_lookup_internal(char *path, size_t len, int lflag,
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    vfs_pair_t *altroot)
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    vfs_lookup_res_t *result, vfs_pair_t *altroot)
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{
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{
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    vfs_pair_t *root;
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    vfs_pair_t *root;
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    if (!len)
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    if (!len)
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        return EINVAL;
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        return EINVAL;
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    memcpy(&plb[first], path, cnt1);
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    memcpy(&plb[first], path, cnt1);
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    memcpy(plb, &path[cnt1], cnt2);
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    memcpy(plb, &path[cnt1], cnt2);
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    ipc_call_t answer;
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    ipc_call_t answer;
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    int phone = vfs_grab_phone(root->fs_handle);
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    int phone = vfs_grab_phone(root->fs_handle);
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    aid_t req = async_send_3(phone, VFS_LOOKUP, (ipcarg_t) first,
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    aid_t req = async_send_4(phone, VFS_LOOKUP, (ipcarg_t) first,
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        (ipcarg_t) (first + len - 1) % PLB_SIZE,
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        (ipcarg_t) (first + len - 1) % PLB_SIZE,
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        (ipcarg_t) root->dev_handle, &answer);
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        (ipcarg_t) root->dev_handle, (ipcarg_t) lflag, &answer);
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    vfs_release_phone(phone);
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    vfs_release_phone(phone);
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    ipcarg_t rc;
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    ipcarg_t rc;
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    async_wait_for(req, &rc);
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    async_wait_for(req, &rc);
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