qemu-common: Document qemu_find_file()

Document qemu_find_file(), in particular the returned
value which must be freed.

Signed-off-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Peter Maydell <[email protected]>
Reviewed-by: Li Qiang <[email protected]>
Reviewed-by: Michael Rolnik <[email protected]>
Tested-by: Michael Rolnik <[email protected]>
Reviewed-by: Daniel P. Berrangé <[email protected]>
Message-Id: <[email protected]>

Author: philmd

include/qemu-common.h

@@ -110,6 +110,23 @@ const char *qemu_get_vm_name(void);
 
 #define QEMU_FILE_TYPE_BIOS   0
 #define QEMU_FILE_TYPE_KEYMAP 1
+/**
+ * qemu_find_file:
+ * @type: QEMU_FILE_TYPE_BIOS (for BIOS, VGA BIOS)
+ *        or QEMU_FILE_TYPE_KEYMAP (for keymaps).
+ * @name: Relative or absolute file name
+ *
+ * If @name exists on disk as an absolute path, or a path relative
+ * to the current directory, then returns @name unchanged.
+ * Otherwise searches for @name file in the data directories, either
+ * configured at build time (DATADIR) or registered with the -L command
+ * line option.
+ *
+ * The caller must use g_free() to free the returned data when it is
+ * no longer required.
+ *
+ * Returns: a path that can access @name, or NULL if no matching file exists.
+ */
 char *qemu_find_file(int type, const char *name);
 
 /* OS specific functions */