https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99533
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jonathan Wakely from comment #1) > > On Linux, called with / it stops when hitting for example a > > "/proc/1/task/1/cwd", resulting in EPERM too. > > But that happens in your code, not in the library. The error is: > > Error: filesystem error: status: Permission denied [/proc/1/task/1/cwd] And that's an EACCES error anyway (as POSIX requires for stat(3) permission errors). The text would be "Operation not permitted" for EPERM.