Hello:
I've found this problem when compile
casync(https://github.com/systemd/casync.git) in cygwin,workflow to
trigger this :
rootfd=open(".",O_CLOEXEC|O_RDONLY|O_NOCTTY);
scandirat(rootfd,".", firstLevelDirEnts......);
foreach dirent in firstLevelDirEnts:
if dirent is dir:
subdirfd=openat(rootfd,
dirent->d_name,O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
scandirat(subdirfd,".", secondLevelDirEnts......);
at this time, secondLevelDirEnts should be files in subdir, but
in cygwin, secondLevelDirEnts is just same as firstLevelDirEnts.
This problem didn't happen in linux , nor win10 WSL, but
happens in both cygwin/msys2.
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