On Sat, Nov 15, 2025 at 3:43 PM Thomas Wolff via Cygwin <[email protected]> wrote: > > > Am 15.11.2025 um 13:58 schrieb Aurélien Couderc via Cygwin: > > Does Cygwin have an API to atomically create a new file with an ACL? > > > > Aurélien > I don't think there's such an API in POSIX. Instead it's the purpose of > the directory default ACL entries to support this. > While the manual pages of setfacl/getfacl are lousy, a fairly lucid > description is in 7.6. POSIX Access Control Lists | Administration Guide > | Red Hat Gluster Storage | 3 | Red Hat Documentation > <https://docs.redhat.com/en/documentation/red_hat_gluster_storage/3/html/administration_guide/sect-posix_access_control_lists>.
That does not help. There are valid use cases, where this becomes security relevant due race conditions between file creation and setting of the ACLs. That's why all mainframe operating systems (and Windows WinNT as VMS descendant) which support ACLs also support file creation with ACLs as an argument. Aurélien -- Aurélien Couderc <[email protected]> Big Data/Data mining expert, chess enthusiast -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
