> On Feb 26, 2018, at 12:11 PM, James Bucanek <subscri...@gloaming.com> wrote: > > More annoying questions... > > How does one use "AFP-style mandatory file locking" in macOS (10.9...current)? > > I'm trying to implement file locking/coordination across various filesystems > and servers. > > The man page for getattrlist() includes the following filesystem capability > test: > > VOL_CAP_INT_MANLOCK If this bit is set, the volume format implementation > supports AFP-style mandatory byte range locks > via ioctl(2). > > AFPFS (a.k.a. AppleShare) volumes, particularly those on AirPort Extreme / > Time Capsule devices, return 1 for this capability. These volumes do not > support flock() or fcntl(F_SETLK) style advisory locking. > > I looked at the man page for ioctl(2) and it contains no real information. It > says the commands for ioctl(2) are documented in <sys/ioctl.h>. > > So I had a look at <sys/ioctl.h> and found very little there; it's basically > an umbrella header for several other headers. So I went through them one at a > time: <sys/ttycom.h>, <sys/ioccom.h>, <sys/filio.h> (the one I would have > assumed it would be in), and <sys/sockio.h>. I could found no mention of any > kind of file or byte range locking commands defined. > > So, is it possible to lock files/ranges on an AFPFS volume using ioctl(2), > and if so where are these commands defined?
> You're going to be in deprecated & unsupported territory but you're going to find your answers in http://www.sqlite.org/src/raw/src/os_unix.c?name=10e0c4dcdbec8d4189890fdf3e71b32efae194e3 > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Filesystem-dev mailing list (Filesystem-dev@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/filesystem-dev/vivek_verma%40apple.com > > This email sent to vivek_ve...@apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Filesystem-dev mailing list (Filesystem-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/filesystem-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
