Visopsys 0.84 released

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Visopsys 0.84 released

Post by andymc » Wed May 15, 2019 9:56 pm

There is a new minor release available from the download page

To summarize, this is a collection of patches that have been back-ported as I work on the 0.9 version. It's mostly under-the-hood (under-the-bonnet for my British friends) stuff that wouldn't be very noticeable to a casual user, but improvements nonetheless.

Here's the official change list:

Overview: This minor maintenance version consists of developer-oriented features, stability and performance enhancements, and bug fixes.
  • Introduced login sessions (userSession in <sys/user.h>) in preparation for the implementation of multi-user operation.
  • Added a kernelUserGetSessions() function (userGetSessions() in user space) for getting a list of current login sessions, and a command-line ‘who’ program to show who’s logged in. For the time being, only one user can be logged in.
  • The ‘help’ command is now more intelligent about what commands it lists, simply by searching the PATH for the names of the binaries, for the time being. If a command is not available, it won’t be shown in the summary listing.
  • Created a new Visopsys library (libvis) with Visopsys-specific code that’s useful in both kernel and user space. Initially populated with the linked-list and variable list code that was previously in the kernel. Definitions for these are now in <sys/vis.h>, and <sys/variable.h> has been removed.
  • Code hardening, to try and ensure that string buffers can – and will – be larger than their maximum lengths, while still being memory-aligned for best performance.
  • Added a <sys/crypt.h> header file for definitions and structures related to hashing and cryptography.
  • Upgraded the kernel multitasker’s process queue, from a simple process array to a linkedList, to benefit from locking and more sophisticated management capabilities.
  • Upgraded the kernel’s font cache, and the window library’s event handlers, from simple arrays to linkedLists, to benefit from locking and more sophisticated management capabilities.
  • Enhanced the kernelGraphicCopyBuffer function so that it can copy a clip of one buffer into another – not necessarily the whole thing.
  • Added a kernelWindowGetList() (windowGetList() in user space) function that fills an array with the objectKeys of the current list of windows.
  • Added a user space ‘windowInfo’ structure for getting information about a window, and a kernelWindowGetInfo() (windowGetInfo() in user space) function to return it.
  • Removed the redundant functions kernelWindowGetSize() and kernelWindowGetLocation() (windowGetSize() and windowGetLocation() in user space).
  • Added a kernelWindowSetRoot() function (windowSetRoot() in user space) to set the attributes of a window so that it is always at the bottom level.
  • Added the kernelWindowMenuUpdate() (windowMenuUpdate() in user space) function for changing the title, character set, contents, or colours of a menu, and updated the window shell and most of the programs to do a better job at refreshing – e.g. in the case of a language switch.
  • Added a kernelWindowComponentLayout() function (windowComponentLayout() in user space) for (re-)doing layout of GUI container components.
  • Added kernelWindowContainerAdd() and kernelWindowContainerDelete() functions, for adding and removing components from generic container components, respectively.
  • Added a kernelWindowMenuDestroy() function (windowMenuDestroy() in user space) for destroying a window menu and properly removing it from any menu bars.
  • Added an optional window parameter to the kernelWindowToggleMenuBar() function, and exported it to user space as windowToggleMenuBar().
  • Added a draw_buffer window drawing operation type, initially for use with the windowCanvas widget.
  • Made the kernelWindowLogin() and kernelWindowLogout() (windowLogin() and windowLogout() in user space) functions ‘wrap’ the kernelUserLogin() and kernelUserLogout() (userLogin() and userLogout() in user space) functions, performing authentication and logging the user in to, or out of, the system, respectively.
  • Exported the kernelTouchAvailable(), which reports whether a touchscreen interface is available, to user space as touchAvailable().
  • Removed the notion of a window context menu – only window components can have them – and removed the unused kernelWindowContextAdd() (windowContextAdd in user space) function.
  • Altered kernelWindowShellDestroyTaskbarComp() (windowShellDestroyTaskbarComp() in user space) to return a status value.
  • De-exported the unused user space functions windowDrawAll(), windowProcessEvent(), windowRedrawArea(), and windowUpdateBuffer().
  • Changed the Visopsys library’s linkedList functionality so that new items are added to the end of the list – rather than the start – and when iterating, the list is oldest-first.
  • Added a kernelUserGetCurrentLoginPid() function to return the process ID of the current user’s login process.
  • Added a login process ID to the kenelUserLogin() (userLogin() in user space) function, so that a login session is tied to a particular process.
  • Removed the redundant kernelUserGetPid() and kernelUserSetPid() (userGetPid() and userSetPid() in user space) functions.
  • Added an optional login program name to the kernelConsoleLogin() function, and used that to clean up the kernelMain() function.
  • Modified the kernelMultitaskerPropagateEnvironment() function so that the parent process whose environment is to be propagated is specified, rather than assumed to be the current process.
  • Exported the kernelWindowSetBackgroundImage() function to user space as windowSetBackgroundImage().
  • Enabled the login program to set up the environment of a user’s login process without polluting its own.
  • Added a process ID argument to kernelEnvironmentLoad(), added the environment functions kernelEnvironmentProcessGet() and kernelEnvironmentProcessSet(), and added kernelMultitaskerGetProcessEnvironment() and kernelMultitaskerSetProcessCurrentDirectory() to the multitasker.
  • Added a ‘run’ parameter to kernelMultitaskerSpawn() (multitaskerSpawn() in user space) and kernelMultitaskerSpawnKernelThread() functions, so that the caller can choose whether the thread runs at the first opportunity, or waits until it is explicitly made runnable at a more appropriate time.
  • Exported the kernelFontGetSystem() function to userspace as fontGetSystem(). Returns a default font that is built in to the kernel and always guaranteed to be available.
  • Packed the window event EVENT_* type flags to make room for more types, and separated the window and window component WINFLAG_* flags into WINDOW_FLAG_* (defined in user space) and WINDOW_COMP_FLAG_* (not defined in user space) respectively.
  • The user space componentParameters flags have been renamed from WINDOW_COMPFLAG_* to COMP_PARAMS_FLAG_*.
  • Packed the windowEvent structure with a union composed of discrete sections for – initially – coordinate and keyboard events, which should never coincide.
  • Removed the unused kernel function kernelPause(), and removed the kernel macro POW() in favour of the C library version.
  • Added vshPageBuffer() and vshPageFile() functions to the Visopsys shell library (libvsh), for showing the contents of a buffer or file, respectively, one screenfull at a time (like the ‘more’ command).
  • Removed the redundant Visopsys Shell library (libvsh) functions vshDeleteFile() and vshMoveFile().
  • Improved header file idempotency, and separated the definitions (including objectKey) from <sys/api.h> into <sys/apidefs.h>, to eliminate circular dependencies with, for example <sys/window.h>.
  • Renamed a number of things in the <sys/window.h> header for better namespace consistency.
  • Fixed: When a user with a touchscreen logs in, the virtual keyboard no longer briefly flashes up on the screen before iconifying.
  • Fixed: Restored the ‘View’ icon to the ‘Programs’ window — missing since the ‘Virtual Keyboard’ icon was added for version 0.8!
  • Fixed: a spurious error condition parsing command line arguments in the ‘kill’ program.
  • Fixed: the kernelMultitaskerPropagateEnvironment() function so that it propagates the environment to children of parent processes’ threads.
  • Fixed: the kernelWindowLayout() (windowLayout() in user space) function for (re-)laying out fixed-size windows, such as the window shell’s root window; switching languages on the fly would cause the root window’s main container to shrink to minimum size.
  • Fixed: a window list iteration in the window thread.
  • Fixed: a linked list iteration in the kernelWindowLogout() (windowLogout() in user space) function, in which a failed kernelWindowDestroy() could theoretically cause a window to be left in the list.
  • Fixed: the kernel API parameter specification for the font objectKey in graphicDrawText().
  • Fixed: the way the C library function strcat() enforces the MAXSTRINGLENGTH limit on string lengths, so that the limit applies to the new concatenated destination string, rather than just the original strings.
  • Fixed: compilation issues when using an older gcc 4 compiler; most notably the ‘lock’ structure has been renamed to ‘spinLock’.

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