From ef844d88632c8456ed4ddb856bb88f05bcb9fe09 Mon Sep 17 00:00:00 2001
From: "Martine S. Lenders" <mail@martine-lenders.eu>
Date: Fri, 13 Dec 2019 12:30:18 +0100
Subject: [PATCH] vfs: provide function to get internal file information by fd

---
 sys/include/vfs.h | 15 +++++++++++++++
 sys/vfs/vfs.c     | 10 ++++++++++
 2 files changed, 25 insertions(+)

diff --git a/sys/include/vfs.h b/sys/include/vfs.h
index 2b547822e06a..9029e1508027 100644
--- a/sys/include/vfs.h
+++ b/sys/include/vfs.h
@@ -882,6 +882,21 @@ int vfs_normalize_path(char *buf, const char *path, size_t buflen);
  */
 const vfs_mount_t *vfs_iterate_mounts(const vfs_mount_t *cur);
 
+/**
+ * @brief   Get information about the file for internal purposes
+ *
+ * @attention   Not thread safe! Do not modify any of the fields in the returned
+ * struct.
+ * @note        For file descriptor internal usage only.
+ *
+ * @internal
+ * @param[in] fd    A file descriptor
+ *
+ * @return  Pointer to the file information struct if a file with @p fd exists.
+ * @return  NULL, when no file with file descriptor @p fd exists.
+ */
+const vfs_file_t *vfs_file_get(int fd);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/sys/vfs/vfs.c b/sys/vfs/vfs.c
index 0938e67f86f3..6cf7232d600a 100644
--- a/sys/vfs/vfs.c
+++ b/sys/vfs/vfs.c
@@ -864,6 +864,16 @@ const vfs_mount_t *vfs_iterate_mounts(const vfs_mount_t *cur)
     return container_of(node, vfs_mount_t, list_entry);
 }
 
+const vfs_file_t *vfs_file_get(int fd)
+{
+    if (_fd_is_valid(fd) == 0) {
+        return &_vfs_open_files[fd];
+    }
+    else {
+        return NULL;
+    }
+}
+
 static inline int _allocate_fd(int fd)
 {
     if (fd < 0) {