Here are the data structures with brief descriptions:

__atomic_fool_gcc_struct
__attribute__
__dummy
__pt_thread_list_s
__pthread_attr_s
__pthread_cancel_s
__pthread_cond_s
__pthread_mutex_s
__pthread_s
_AGP_Memory_s
_AIOContext
_ArgCopy
_ArpHeader
_CacheBlock
_CacheHeap
_DbgCmd
_Device
_DisabledDevice
_ElfImage
_ElfImageInst
_ElfSymbol
_EthernetHeader
_File
_FileLockRec
_FileSysDesc
_fpreg
_fpstate
_fpxreg
_ICMPHeader
_Inode
_IpFragQueue
_IpHeader
_MemArea
_MemContext
_MessageNode
_MsgPort
_NetQueue
_NodeMonitor
_old_mixer_info
_PacketBuf
_Page
_Process
_PublicPort
_RawEndPoint
_RawPort
_RWHolder
_RWLock
_RWWaiter
_Semaphore
_TCPCtrl
_TCPEvent
_TCPFragment
_TCPHeader
_Thread
_TimerNode
_UDPEndPoint
_UDPHeader
_UDPPort
_Volume
_WaitQueue
_xmmreg
AcpiMadt_s
AGP_Allocate_s
AGP_Bind_s
AGP_Bridge_s
AGP_bus_s
AGP_Device_s
AGP_Gatt_s
AGP_Info_s
AGP_Memory_Info_s
AGP_Methods_s
AGP_Mmap_s
AGP_Node_s
AGP_Setup_s
AGP_Unbind_s
AGP_Version_s
aiocb
AreaInfo_s
atomic_t
attr_info
audio_buf_info
BatteryStatus_s
block_header
BlockCache_s
BootModule_s
buffmem_desc
BusHandle_t
CacheEntryList_s
cdda_block
cdrom_audio_track
cdrom_msf
cdrom_packet_cmd
cdrom_toc
cdrom_toc_entry
cdrom_toc_header
ClientHandle_t
ClientInfo_s
ClockTime_s
copr_buffer
copr_debug_buf
copr_msg
count_info
CPU_Extended_Info_v1_s
CPUIdleState_s
CPUInfo_s
CPUPerformanceState_s
DBPacketHdr_s
device_geometry
DeviceEntry_s
DeviceHandle_t
DeviceInfo_s
DevVolume_s
DMAChannel_s
DR_ThreadDied_s
Elf32_Dynamic_s
Elf32_ElfHdr_s
Elf32_HashTable_s
Elf32_PrgHeader_s
Elf32_Reloc_s
Elf32_RelocA_s
Elf32_SectionHeader_s
Elf32_Symbol_s
elf_fpregset_t
elf_fpxregset_t
Errno_info
fd_set
FileNode
flock
fs_info
HashTable_s
ifconf
ifreq
image_info
ImageContext_s
index_info
InodeList_s
IoContext_s
iovec
irqaction
kaiocb
kernel_dirent
kernel_itimerval
kernel_timeval
kernel_vm86_struct
KernelSymbol_s
LocalBuffer_s
MBBootModule_s
MBMemoryMapEntry_s
MemAreaOps
MemChunk
MemHeader
midi_info
mixer_info
mixer_vol_table
MouseEvent_s
MpConfigBus_s
MpConfigIntLocal_s
MpConfigIntSrc_s
MpConfigIOAPIC_s
MpConfigProcessor_s
MpConfigTable_s
MpFloatingPointer_s
mpu_command_rec
MultiArray_s
MultiBootHeader_s
net_device
net_device_stats
NodeWatchEvent_s
page_descriptor
Partition_s
PartitionRecord_s
patch_info
PCI_bus_s
pci_device_id
PCI_Entry_s
PCI_Info_s
pgd_t
PipeCookie_s
PipeNode_s
port_info
ProcessorInfo_s
pte_t
pthread_condattr_t
pthread_mutexattr_t
pthread_rwlockattr_t
PtyFileCookie_s
PtyVolume_s
remove_sample
Resource_s	Descriptor of the resource
RFSCookie_s
RMREGS
RootVolume_s
rtabentry
rtc_time
rtentry
rttable
rusage
sbi_instrument
SCSI_bus_s
SCSI_cmd_t
SCSI_device_t
SCSI_host_t
SCSI_sense_s
sem_info
SemContext_s
seq_event_rec
seqcount
SeqLock_s
ServiceHandle_t
SFBlockRun_s
sigcontext
sigevent
sigval
size_descriptor
SmpTrampolineCfg_s
sound_timer_info
SpinLock_s
stat
stat64
SwapInfo_s
SwapNode_s
synth_control
synth_info
SysCall_info
SysCallRegs_s
sysex_info
system_info
system_info_v3
SystemBase
TermInfo_s
termio
termios
thread_info
timespec
uqe
usb_alt_interface
USB_bus_driver_t
USB_bus_s
usb_ctl_request
USB_desc_config_s
USB_desc_device_s
USB_desc_endpoint_s
USB_desc_header_s
USB_desc_interface_s
USB_desc_string_s
USB_device_t
USB_driver_t
USB_interface_s
usb_io_request
USB_ISO_frame_s
USB_libusb_node_t
USB_packet_t
USB_request_s
user
user_regs_struct
utimbuf
Vesa_Info
VESA_Mode_Info
Virtual86Regs_s
Virtual86Struct_s
WaitThreadNode
winsize
WriteAttrParams_s