see the reference here: https://pubs.opengroup.org/onlinepubs/009695399/basedefs/ftw.h.html Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com> Change-Id: I3b368106a56b0e9d4c653f3ae16304b0a9d55fbc
Add the ftw.h header file as specified at OpenGroup.org: https://pubs.opengroup.org/onlinepubs/009695399/basedefs/ftw.h.html