Release Notes for HelenOS 0.7.1

HelenOS 0.7.1 (Enlightened Zeal) was released on November 12, 2017.

This document contains a summary of changes made to HelenOS since release 0.7.0.

Special Notes for this Release

  • HelenOS is still an experimental operating system at this point in time and support for many platforms and hardware devices is not production-ready. For the time being, the agile 6-month release cycle might therefore produce releases that are slightly less "polished" in certain aspects, but it is also a driving force towards turning HelenOS into a production-ready operating system in the near future.

Features Introduced in This Release


  • This is the last release which uses the Bazaar version control system (VCS). Future releases will use Git.
  • The system can again be built by clang for amd64


  • Basic support for capabilities
    • IPC phones have in fact been a sort of capabilities since the beginning. This work generalizes some of the IPC code to support more kernel object types.
    • IRQ structures are now managed using capabilities. It is no longer possible to unregister someone else's IRQ.
    • The limit of 64 IPC phones has been removed and is now virtually infinite.
  • The kernel is now using the resizable hash table which has been already used in uspace since 2012.

Services and Drivers

  • The naming service was converted to use the async framework
  • CUDA driver was converted to the Device Driver Framework
  • The interrupt controller drivers were converted to using the Device Driver Framework
  • User can now unload an idle driver using devctl unload-drv
  • Framebuffer now gets mapped only when actually used

File Systems

  • All file system operations are relative to a specified node, client-side root
  • Mountpoints are no longer stored in the filesystem servers, but in VFS
  • Inbox mechanism for passing files from parent to a new child
  • Client-side I/O cursors (file positions)
  • Overhaul of the client interface; all APIs begin with the vfs_ prefix and can be used after including vfs/vfs.h
  • Removal of some POSIX-ish headers and definitions
  • File system probing
  • Volume label support


  • Lots of networking fixes in TCP, DNS and HTTP protocols
  • TCP unit tests


  • The pkg utility was added which allows installing packages from into a running instance of HelenOS


  • Effort towards greater C11 compliance and a cleaner cut between HelenOS-specific, C11 and POSIX code
  • io/table module to print tabular output (used by devctl, inet).


Fixed Logged Bugs & Enhancements

  • For the list of all logged defects fixed in this release, see this report.
  • For the list of all logged enhancements integrated in this release, see this report.

Known Bugs

  • For the list of known bugs still not fixed in this release, see this report.
  • For the list of all open tickets, see this report.
Last modified 5 years ago Last modified on 2019-05-11T19:31:15Z
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