[devmgr][rpc-server] fsync should return ZX_ERR_NOT_SUPPORTED on block devices ZX-3294 Block devices in Zircon do not support flushing/fsync operations. * This patch updates the rpc-server to return an error (rather than success) when a caller tries to perform fsync on a block device to indicat that the operation is not supported. Test: Verify that fsync returns an error when called on a block device. Change-Id: Ie23fe7b71eef54fb3e4ea0ee0a50626c9d193d34
Zircon is the core platform that powers the Fuchsia OS. Zircon is composed of a microkernel (source in kernel/...) as well as a small set of userspace services, drivers, and libraries (source in system/...) necessary for the system to boot, talk to hardware, load userspace processes and run them, etc. Fuchsia builds a much larger OS on top of this foundation.
The canonical Zircon Git repository is located at: https://fuchsia.googlesource.com/zircon
The Zircon Kernel provides syscalls to manage processes, threads, virtual memory, inter-process communication, waiting on object state changes, and locking (via futexes).
Currently there are some temporary syscalls that have been used for early bringup work, which will be going away in the future as the long term syscall API/ABI surface is finalized. The expectation is that there will be about 100 syscalls.
Zircon syscalls are generally non-blocking. The wait_one, wait_many port_wait and thread sleep being the notable exceptions.
This page is a non-comprehensive index of the zircon documentation.