macFUSE 5.3.3

Version 5.3.3:

General:

• Update build process to use Xcode 26.6 (macOS 26.5 SDK)
• Improve daemonization compatibility for file systems using the FSKit backend through libfuse and libfuse3

Kernel Extension (Kernel Backend):

• Update the kernel extension version to 5.3.3
• Add support for interrupting readers blocked on the FUSE device
• This is used by MFMount.framework to wake worker threads during teardown.

MFMount.framework:

• Add function MFChannelInterrupt()
• This allows callers to interrupt threads blocked in MFChannelCopyNextMessage() and MFChannelWaitForNextMessage() without closing the channel. When interrupted, both functions return an error and set errno to EINTR.
• Make channel receives interruptible by SIGHUP, SIGINT, SIGTERM, and SIGPIPE
• Add a cancel-safe C trampoline for Swift API entry points
• Swift code now runs with pthread cancellation disabled. Pending cancellation is delivered after returning from Swift to the C trampoline in the framework.
• Use XPC lightweight code requirements on macOS 14.4 and later when verifying the mount service
• Please note that parts of the MFMount.framework API may still change in future releases.

libfuse:

• Defer the actual macOS mount process until first session use
• This prevents XPC, DiskArbitration, CoreFoundation, and MFMount state from being created before daemonization in the normal fuse_main() flow.
• Avoid forking in fuse_daemonize() after the macOS mount process has started
• Improve signal handling on macOS by requesting an interrupt from the signal handler and performing the actual unmount from regular library code
• Improve multithreaded loop teardown by interrupting the MFChannel after cancelling worker threads
• Replace dispatch_semaphore_t with a pthread-based fallback and use timed waits where signal responsiveness is required

libfuse3:

• Defer the actual macOS mount process until first session use
• This prevents XPC, DiskArbitration, CoreFoundation, and MFMount state from being created before daemonization in the normal fuse_main() flow.
• Avoid forking in fuse_daemonize() after the macOS mount process has started
• Improve signal handling on macOS by routing interrupts through the normal unmount path
• For custom_io sessions, interrupts fall back to the regular session-exit behavior because libfuse3 does not own the mount lifecycle.
• Improve multithreaded loop teardown by interrupting the MFChannel after cancelling worker threads
• Replace dispatch_semaphore_t with a pthread-based fallback and use timed waits where signal responsiveness is required