id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13172	filesystem::directory_iterator::operator++: Function not implemented (errno not reset)	Simon Warta <simon@…>	Beman Dawes	"In `boost/libs/filesystem/src/operations.cpp` we have `readdir_r_simulator`, which throws

> exception of type boost::filesystem::filesystem_error: boost::filesystem::directory_iterator::operator++: Function not implemented: ""/data/local/tmp/my_existing_path""

This is because `errno` is not reset after the `::sysconf(_SC_THREAD_SAFE_FUNCTIONS)` call, which sets errno to 38 = ENOSYS.

A patch is to add the line errno = 0; after `::sysconf(_SC_THREAD_SAFE_FUNCTIONS)`.

This affects Android, e.g. https://github.com/android-ndk/ndk/issues/457 "	Bugs	new	To Be Determined	filesystem	Boost 1.64.0	Problem		filesystem, errno, sysconf, readdir, Android