Announcing macFUSE 5.3.3

Announcing macFUSE 5.3.3 Posted on 04 Jul 2026

Download macFUSE 5.3.3 macOS 12 or later Apple Silicon or Intel SHA-256: 7a0b7b66c0e7f8932707d1215dc9cf486e178d097ae0a2dcdf17d8530566aa15

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

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.

Add MFChannelInterrupt() function

This allows callers to interrupt threads blocked in MFChannelCopyNextMessage() without closing the channel.
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.

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

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

Your support is important to sustaining the future development of this project. If macFUSE makes your life easier, consider sponsoring the project through GitHub Sponsors.