libctru v2.0.1

• Added CFG_SystemModel enum.
• Fixed bug in condvar code.
• Fixed bug in srvpm code.
• Fixed const correctness issues in gspgpu code.
• Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.

libctru v2.0.0

This is a major release. Many essential components have been overhauled, although breaking changes are minimal and only affect rarely used functionality.

system

• Added support for userAppInit/userAppExit (backported from libnx).
• Changed default heap allocation logic to be more robust:
  • Resource limit SVCs are now used to detect available memory.
  • The heap size calculation algorithm was tweaked so that 32MB of linear heap are available for normal apps running under the default appmemtype layout on Old 3DS, as it was the case prior to libctru 1.8.0.
• SVC enhancements:
  • Added svcControlPerformanceCounter with corresponding enums.
  • Overhauled support for DMA related SVCs:
    • Added svcRestartDma.
    • Added enums and structures needed for DMA SVCs.
    • Added dmaDeviceConfigInitDefault, dmaConfigInitDefault.
  • Added svcArbitrateAddressNoTimeout (minor ABI optimization for the svcArbitrateAddress syscall when the timeout parameter is not used).
  • Changed process memory SVCs to use u32 parameters instead of void* for foreign-process addresses.
• Major refactor of OS related functions:
  • Added defines for Arm11 userland memory region addresses/sizes.
  • Added struct definitions for the kernel/system shared config pages: osKernelConfig_s, osSharedConfig_s.
  • Added macros to access the kernel/system shared config pages: OS_KernelConfig, OS_SharedConfig.
  • Fixed return type of osGetMemRegionUsed, osGetMemRegionFree (s64 -> u32).
  • Refactored osConvertVirtToPhys and added support for the missing linearly mapped memory regions.
  • Rewritten RTC time reading support to improve accuracy and match official logic more closely.
    • Time drift correction is now implemented.
    • Added osGetTimeRef function for reading the current reference timepoint published by the PTM sysmodule.
  • Fixed osStrError to actually work properly.
  • Cleaned up osGetSystemVersionData implementation.
  • Other miscellaneous internal cleanup.

synchronization

• Improved safety of usermode synchronization primitives when used in intercore contexts.
• Added CondVar synchronization primitive implementation.
• Added syncArbitrateAddress, syncArbitrateAddressWithTimeout.
  • These functions replace __sync_get_arbiter (which has been removed).
• Added __dmb (Data Memory Barrier) intrinsic.
• Added LightEvent_WaitTimeout.
• Added LightSemaphore_TryAcquire.
• Changed LightLock to support 0 as a valid initial (unlocked) state.
  • This effectively adds support for trivially initialized/zerofilled locks.
• Fixed bug in LightSemaphore_Acquire.

graphics

• Major refactor of the GSP service wrapper. It should now be possible to use GSP directly without the gfx API, if the user so desires.
• Major internal refactor of the gfx wrapper API that increases maintainability.
• Added support for 800px wide mode with non-square pixels on the top screen - usable on every 3DS model except for Old 2DS (but including New 2DS XL).
• Added support for 800px wide mode to the libctru console.
• Transferred most of the GSP initialization duties to gspInit/gspExit (previously done by the gfx wrapper).
• Added defines for screen IDs and screen dimensions.
• Added gspPresentBuffer for pushing a framebuffer to the internal GSP swap queue (previously this was an internal function in the gfx wrapper).
• Added gspGetBytesPerPixel, gspHasGpuRight.
• Added gfxScreenSwapBuffers, with support for duplicating left->right eye content during stereoscopic 3D mode.
• Fixed LCD configuration mode when using framebuffers on VRAM with the gfx wrapper.
• Changed gfxExit to set LCD force-black status to true.
• Changed the gfx wrapper to always use gspPresentBuffer during swap. This means the immediate parameter of gfxConfigScreen no longer has any effect, and gfxSwapBuffers/gfxSwapBuffersGpu now do the same thing - that is, present the rendered content during the next VBlank.
• Renamed GSPGPU_FramebufferFormats enum to GSPGPU_FramebufferFormat.
• Deprecated gfxConfigScreen (use gfxScreenSwapBuffers instead).
• Removed gspInitEventHandler, gspExitEventHandler (now handled automatically inside gspInit/gspExit).
• Removed sharedGspCmdBuf param from gspSubmitGxCommand (now uses the proper GSP shared memory address automatically).
• Removed GSPGPU_REBASE_REG define (leftover from early 3DS homebrew).
• Removed numerous internal fields that were previously publicly accessible.

audio

• DSP access rights are now managed using a hook mechanism, similar to the APT hook.
  • This fixes audio playback during libapplet invocations, as they no longer relinquish DSP rights.
• Changed NDSP to use the DSP hook instead of the APT hook.
• Added dspIsComponentLoaded, dspHook, dspUnhook.
• Fixed and improved robustness of wavebuf handling in NDSP code.
• Fixed and refactored NDSP sleep/wakeup code to improve accuracy compared to official logic.

filesystem

• Reduced TLS footprint of the archive/romfs devices by sharing buffers.
• Reduced the maximum number of concurrently registered archive devices from 32 to 8 in order to save memory.
• Backported multi-mount romfs system from libnx, with additional optimizations (breaking API change).
• Added romfsMountFromTitle.
• Fixed stat for romfs device to return -1 for non-existent files/directories.

applet

• Major internal refactor of the APT service wrapper that should improve accuracy compared to official logic.
• Fixed sleep handling when the app is inactive (i.e. app is suspended).
• Added support for screen capture during libapplet transitions.
• Added support for proper DSP access right management.
• aptLaunchLibraryApplet no longer calls aptMainLoop internally. Library applet calls no longer return a bool value, users are advised to check APT state manually afterwards.
• Added functions for checking APT state: aptIsActive, aptShouldClose, aptShouldJumpToHome, aptCheckHomePressRejected (replaces aptIsHomePressed).
• Added functions for handling incoming requests: aptHandleSleep, aptHandleJumpToHome.
• Added aptJumpToHomeMenu.
• Changed aptMainLoop to use the new wrapper functions (this means aptMainLoop can now be replaced by custom logic if desired).
• Changed APTHOOK_ONEXIT to be invoked during aptExit instead of during aptMainLoop.
• Added aptClearChainloader, aptSetChainloaderToSelf.

miscellaneous

• Fix decompress out-of-bounds access.
• Added NDM_ prefix to NDM enum members in order to avoid name collisions.
• Corrected parameter type in several CFGU functions.
• Corrected return value of GSPLCD_GetBrightness.
• Removed obsolete support for ninjhax 1.x's fake hb:HB service.
• Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.

libctru 1.9.0

• hid: Added hidKeysDownRepeat, hidWaitForAnyEvent. Allow user override of irsst usage.
• Add ptm rtc time commands
• Add sleep state FSM handling service commands
• Revamp mappableAlloc
• Fixed stat on romfs for directories, implemented lstat via stat (FAT32 has no symlinks)
• Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.

binaries available via devkitPro pacman

libctru 1.8.0

• Added support for environments where the home menu is not launched (such as running under SAFE_FIRM)
• Added FSPXI service wrappers
• Changed heap allocation logic to be more flexible; this fixes support for certain system memory layouts
• Cleaned up and optimized light lock locking code
• Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.

binaries available via devkitPro pacman

libctru 1.7.0

• fix FIONBIO ioctl
• Fix CAMU_GetLatestVsyncTiming
• Add archive STDIO device driver
• Add AC commands that allow forcing a wifi connection
• Fix dspInit() error handling in ndspInit()
• Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.

libctru v1.6.0

• Major overhaul to font loading code in order to support loading external fonts.
• Major overhaul to PM service wrappers, now with separate support for pm:app and pm:dbg.
• Added Rosalina GDB host IO (gdbhio) support.
• Added support for the fs:REG service.
• Added support for the PxiPM service.
• Added PM launch flag definitions.
• Added SO_BROADCAST.
• Added new APT helper functions: aptIsHomeAllowed, aptSetHomeAllowed, aptIsHomePressed.
• Added support for the Mii selector libapplet, and other improvements to Mii support.
• Renamed IPC_Desc_CurProcessHandle to IPC_Desc_CurProcessId.
• Changed signature of LOADER_RegisterProgram to use FS_ProgramInfo structs.
• Fixed IPC bugs in the Loader service.
• Fixed svcCreateResourceLimit.
• Fixed corner case bug in GPUCMD_Add.
• Fixed bugs in select and herror.
• Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.

libctru v1.5.1

• Added support for the FRD service.
• Added gas-related GPU definitions.
• Implemented nanosleep.
• Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.

libctru 1.5.0

Version 1.5.0

• Added new decompression API which supports LZSS/LZ10, LZ11, RLE & Huffman formats, and which can read compressed data from memory or from a file.
• Added srvSetBlockingPolicy, which controls whether srvGetServiceHandle blocks when the service isn't yet registered (or returns an error otherwise).
• Added ACU commands: ACU_GetStatus, ACU_GetSecurityMode, ACU_GetSSIDLength, ACU_GetSecurityMode, ACU_GetProxyEnable, ACU_GetProxyPort, ACU_GetProxyUserName, ACU_GetProxyPassword, ACU_GetLastErrorCode, ACU_GetLastDetailErrorCode.
• Added CFGI commands: CFGI_SecureInfoGetSerialNumber, CFGU_IsNFCSupported, CFGI_GetLocalFriendCodeSeed, CFGI_GetLocalFriendCodeSeedData, CFGI_GetSecureInfoData, CFGI_GetSecureInfoSignature.
• Added MCUHWC commands: MCUHWC_SetWifiLedState, MCUHWC_SetPowerLedState, MCUHWC_Get3dSliderLevel, MCUHWC_GetFwVerHigh, MCUHWC_GetFwVerLow.
• Added NS commands: NS_TerminateTitle, NS_TerminateProcessTID (with timeout), NS_RebootSystem.
• Added PM commands: PM_TerminateCurrentApplication, PM_TerminateProcess, PM_UnregisterProcess.
• Overhauled NDMU service support and added many commands that were previously missing.
• Fixed bugs in srv:pm implementation.
• Fixed calculation of vertical texture coordinates in fontCalcGlyphPos.
• Fixed shaderProgramSetGshInputPermutation.
• Fixed and added clock speed constants (affects system clock and NDSP).
• Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.

libctru 1.4.0

• Added LightSemaphore synchronization primitive.
• Added exheader definitions.
• Added support for the Loader service.
• Added support for the mcu::HWC service.
• Added support for the Mii selector applet.
• Added ResourceLimitType.
• Added AM commands: AM_DeleteAllTemporaryTitles, AM_DeleteAllExpiredTitles, AM_DeleteAllTwlTitles.
• Added CFGI commands: CFGI_RestoreLocalFriendCodeSeed, CFGI_RestoreSecureInfo, CFGI_DeleteConfigSavefile, CFGI_FormatConfig, CFGI_ClearParentalControls, CFGI_VerifySigLocalFriendCodeSeed, CFGI_VerifySigSecureInfo.
• Added GSPGPU commands: GSPGPU_SetLedForceOff.
• Added GSPLCD commands: GSPLCD_SetBrightness, GSPLCD_SetBrightnessRaw, GSPLCD_PowerOnAllBacklights, GSPLCD_PowerOffAllBacklights, GSPLCD_SetLedForceOff.
• Fixed srv:pm handling in pre-7.x system versions.
• Fixed GPU_LIGHTPERM macro definition.
• Removed the remaining deprecated GPUCMD commands.
• Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.

libctru 1.3.0

• Implement more svc calls
  • svcCreateResourceLimit
  • svcSetResourceLimitValues
  • svcSetProcessResourceLimits
  • svcCreateSession
  • svcCreateSessionToPort
  • svcSetGpuProt
  • svcSetWifiEnabled
• Additional functions
  • implement httpcAddPostDataBinary
  • implement PTMU_GetAdapterState
  • implement GSPLCD_GetBrightness
  • add threadDetach
• srv fixes
  • Fix srvPublishToSubscriber documentation
  • Fix handling of service/named port names of length 8
  • Fix srvRegisterPort
• debugging support
  • Add support for user-specified exception handlers
  • Rename debugDevice_3DMOO to debugDevice_SVC
  • created debug version of library
• Implement error applet
• GPU updates
  • Add GX command queue system for batching GX commands
  • Correct GPU_PROCTEX_LUTID definition
  • Add GPU_FOGMODE, GPU_GASMODE and GPU_GASLUTINPUT
• Other improvements and minor adjustments for overall system stability to enhance the user experience

With thanks to @TuxSH, @fincs, @mtheall, @HiddenRambler, @Pirater12, @BlackLotus and @yuriks for their contributions to this release.