| CaccelVector | Accelerometer vector |
| CacuConfig | Struct to contain the data for connecting to a Wifi network from a stored slot |
| Caddrinfo | |
| CAM_ContentInfo | Contains information about a title's content |
| CAM_PendingTitleEntry | |
| CAM_TitleEntry | Contains basic information about a title |
| CAM_TWLPartitionInfo | Information about the TWL NAND partition |
| CangularRate | Gyroscope angular rate |
| CaptCaptureBufInfo | APT capture buffer information |
| CaptHookCookie | APT hook cookie |
| Carchive_dir_t | Open directory struct |
| CAttachProcessEvent | Event relating to the attachment of a process |
| CAttachThreadEvent | Event relating to the attachment of a thread |
| CbossContext | BOSS context |
| CCAMU_ImageQualityCalibrationData | Image quality calibration data |
| CCAMU_PackageParameterCameraSelect | Batch camera configuration for use without a context |
| CCAMU_PackageParameterContext | Batch camera configuration for use with a context |
| CCAMU_PackageParameterContextDetail | Batch camera configuration for use with a context and with detailed size information |
| CCAMU_StereoCameraCalibrationData | Stereo camera calibration data |
| CCFNT_s | Font structure |
| CcharWidthInfo_s | Character width information structure |
| CcirclePosition | Circle Pad position |
| CCMAP_s | Font character map structure |
| CCodeSetHeader | Information on address space for process. All sizes are in pages (0x1000 bytes) |
| CConsoleFont | A font struct for the console |
| CCpuRegisters | Structure representing CPU registers |
| CCSND_CapInfo | Capture info |
| CCSND_ChnInfo | Channel info |
| CCWDH_s | Font character width information block structure |
| CDebugEventInfo | Information about a debug event |
| CDebuggerBreakExceptionEvent | Event relating to svcBreakDebugProcess |
| CdecompressIOVec | I/O vector |
| CDmaConfig | Configuration stucture for svcStartInterProcessDma |
| CDmaDeviceConfig | Device configuration structure, part of DmaConfig |
| CdspHookCookie | DSP hook cookie |
| CDVLB_s | DVLB data |
| CDVLE_constEntry_s | DVLE constant entry data |
| CDVLE_outEntry_s | DVLE output entry data |
| CDVLE_s | DVLE data |
| CDVLE_uniformEntry_s | DVLE uniform entry data |
| CDVLP_s | DVLP data |
| CERRF_ExceptionData | |
| CERRF_ExceptionInfo | |
| CERRF_FatalErrInfo | |
| CerrorConf | |
| CExceptionEvent | Event relating to exceptions |
| CExHeader | The NCCH Extended Header of a title |
| CExHeader_AccessControlInfo | The access control information of a title |
| CExHeader_AccessDescriptor | Extended header access descriptor |
| CExHeader_Arm11CoreInfo | The CPU-related and memory-layout-related info of a title |
| CExHeader_Arm11KernelCapabilities | The ARM11 kernel capabilities of a title |
| CExHeader_Arm11StorageInfo | The ARM11 filesystem info of a title |
| CExHeader_Arm11SystemLocalCapabilities | The ARM11 system-local capabilities of a title |
| CExHeader_Arm9AccessControl | The ARM9 access control of a title |
| CExHeader_CodeSectionInfo | Information about a title's section |
| CExHeader_CodeSetInfo | The name of a title and infomation about its section |
| CExHeader_Info | Main extended header data, as returned by PXIPM, Loader and FSREG service commands |
| CExHeader_SystemControlInfo | The code set info, dependencies and system info of a title (SCI) |
| CExHeader_SystemInfo | The savedata size and jump ID of a title |
| CExHeader_SystemInfoFlags | The system info flags and remaster version of a title |
| CExitProcessEvent | Event relating to the exiting of a process |
| CExitThreadEvent | Event relating to the exiting of a thread |
| CFaultExceptionEvent | Event relating to fault exceptions (CPU exceptions other than stop points and undefined syscalls) |
| CFINF_s | Font information structure |
| Cfloat24Uniform_s | 24-bit float uniforms |
| CfontGlyphPos_s | Font glyph position structure |
| CFpuRegisters | Structure representing FPU registers |
| CFriendKey | Friend key data |
| CFriendProfile | Friend profile data |
| CFS_ArchiveResource | Archive resource information |
| CFS_DeviceMoveContext | Device move context |
| CFS_DirectoryEntry | Directory entry |
| CFS_ExtSaveDataInfo | Ext save data information |
| CFS_IntegrityVerificationSeed | Integrity verification seed |
| CFS_Path | Filesystem path data, detailing the specific target of an operation |
| CFS_ProductInfo | Product information |
| CFS_ProgramInfo | Program information |
| CFS_SdMmcSpeedInfo | SDMC/NAND speed information |
| CFS_SystemSaveDataInfo | System save data information |
| CGameDescription | Game Description structure |
| CGSPGPU_CaptureInfo | Capture info |
| CGSPGPU_CaptureInfoEntry | Capture info entry |
| CGSPGPU_FramebufferInfo | Framebuffer information |
| CgxCmdEntry_s | GX command entry |
| CgxCmdQueue_s | GX command queue structure |
| Chostent | |
| ChttpcContext | HTTP context |
| Cin_addr | |
| CInfoLedPattern | |
| Cip_mreq | |
| CLightEvent | A light event |
| CLightSemaphore | A light semaphore |
| Clinger | |
| CMapEvent | Event relating to the mapping of memory |
| CMemInfo | Memory information |
| CMiiData | Shared Mii struct |
| CMiiSelectorConf | Parameter structure passed to AppletEd |
| CMiiSelectorReturn | Structure written by AppletEd |
| CMVDSTD_Config | Processing configuration |
| CMVDSTD_InitStruct | This can be used to override the default input values for MVDSTD commands during initialization with video-processing. The default for these fields are all-zero, except for cmd1b_inval which is 1. See also here: https://www.3dbrew.org/wiki/MVD_Services |
| CMVDSTD_OutputBuffersEntry | |
| CMVDSTD_OutputBuffersEntryList | |
| CMVDSTD_ProcessNALUnitOut | |
| CndspAdpcmData | ADPCM data |
| CndspWaveBuf | Wave buffer struct |
| CNFC_AmiiboConfig | AmiiboConfig structure, see also here: https://3dbrew.org/wiki/NFC:GetAmiiboConfig |
| CNFC_AmiiboSettings | AmiiboSettings structure, see also here: https://3dbrew.org/wiki/NFC:GetAmiiboSettings |
| CNFC_AppDataInitStruct | Used by nfcInitializeWriteAppData() internally, see also here: https://3dbrew.org/wiki/NFC:GetAppDataInitStruct |
| CNFC_AppDataWriteStruct | Used by nfcWriteAppData() internally, see also: https://3dbrew.org/wiki/NFC:WriteAppData |
| CNFC_TagInfo | |
| CNIM_TitleConfig | Input configuration for NIM download/installation tasks |
| CNIM_TitleProgress | Output struct for NIM downloads/installations in progress |
| CNotificationEvent | Friend Notification Event structure |
| CNotificationHeader | Notification header data |
| CnwmBeaconDataReplyEntry | General NWM output structure from AP scanning, for each entry |
| CnwmBeaconDataReplyHeader | General NWM output structure from AP scanning |
| CnwmScanInputStruct | General NWM input structure used for AP scanning |
| COS_VersionBin | OS_VersionBin. Format of the system version: "<major>.<minor>.<build>-<nupver><region>" |
| CosKernelConfig_s | Kernel configuration page (read-only) |
| CosSharedConfig_s | Shared system configuration page structure (read-only or read-write depending on exheader) |
| CosTimeRef_s | Time reference information struct (filled in by PTM) |
| COutputStringEvent | Event relating to debug output |
| CPageInfo | Memory page information |
| Cpollfd | |
| CPrintConsole | Console structure used to store the state of a console render context |
| CpsRSAContext | RSA context |
| CPtmSleepConfig | |
| CPtmWakeEvents | PDN wake events and MCU interrupts to select, combined with those of other processes |
| CPXIDEV_SPIBuffer | Card SPI transfer buffer |
| CQtmCalibrationData | QTM calibration data (fully enabled/SS3D disabled) in cfg. Usually all-zero on N2DSXL |
| CQtmRawTrackingData | QTM raw eye tracking data |
| CQtmStatusCfgData | QTM status data (fully enabled/SS3D disabled) in cfg. Usually all-zero on N2DSXL |
| CQtmTrackingData | QTM processed eye tracking data, suitable for 3D programming |
| Crbtree_node_t | An rbtree node |
| Crbtree_t | An rbtree |
| Cromfs_dir | RomFS directory |
| Cromfs_file | RomFS file |
| Cromfs_header | RomFS header |
| CScheduleInOutEvent | Event relating to the scheduler |
| CshaderInstance_s | Describes an instance of either a vertex or geometry shader |
| CshaderProgram_s | Describes an instance of a full shader program |
| Csockaddr | |
| Csockaddr_in | |
| Csockaddr_storage | |
| CSOCU_ARPTableEntry | One entry of the ARP table retrieved by using SOCU_GetNetworkOpt and NETOPT_ARP_TABLE |
| CSOCU_DNSTableEntry | One entry of the DNS servers table retrieved by using SOCU_GetNetworkOpt and NETOPT_DNS_TABLE |
| CSOCU_IPInfo | Structure returned by SOCU_GetNetworkOpt when using NETOPT_IP_INFO |
| CSOCU_RoutingTableEntry | One entry of the routing table retrieved by using SOCU_GetNetworkOpt and NETOPT_ROUTING_TABLE |
| CSOCU_TCPTableEntry | One entry of the TCP sockets table retrieved by using SOCU_GetNetworkOpt and NETOPT_TCP_TABLE |
| CSOCU_UDPTableEntry | One entry of the UDP sockets table retrieved by using SOCU_GetNetworkOpt and NETOPT_UDP_TABLE |
| CsslcContext | Sslc context |
| CStartupInfo | Information for the main thread of a process |
| CStopPointExceptionEvent | Event relating to stop points |
| CSwkbdDictWord | Keyboard dictionary word for predictive input |
| CSwkbdExtra | Internal libctru book-keeping structure for software keyboards |
| CSwkbdLearningData | Keyboard predictive input learning data |
| CSwkbdState | Software keyboard parameter structure, it shouldn't be modified directly |
| CSwkbdStatusData | Keyboard status data |
| CSyscallInOutEvent | Event relating to syscalls |
| CTGLP_s | Font texture sheet information |
| CThreadContext | |
| CTickCounter | Tick counter |
| CTitleData | Friend Title data |
| CtouchPosition | Touch position |
| CudsBindContext | |
| CudsConnectionStatus | Connection status struct |
| CudsNetworkScanInfo | Output structure generated from host scanning output |
| CudsNetworkStruct | Network struct stored as big-endian |
| CudsNodeInfo | Node info struct |
| CUserBreakExceptionEvent | Event relating to svcBreak |
| CY2RU_ColorCoefficients | Coefficients of the YUV->RGB conversion formula |
| CY2RU_ConversionParams | Structure used to configure all parameters at once |
| CY2RU_DitheringWeightParams | Dithering weights |
