core.sys.linux.io_uring

struct io_uring_sqe;

IO submission data structure (Submission Queue Entry)

ubyte opcode;

type of operation for this sqe

ubyte flags;

IOSQE_* flags

ushort ioprio;

ioprio for the request

int fd;

file descriptor to do IO on

ulong off;

offset into file

ulong addr;

pointer to buffer or iovecs

uint len;

buffer size or number of iovecs

ushort poll_events;

compatibility

uint poll32_events;

word-reversed for BE

ulong user_data;

data to be passed back at completion time

ushort buf_index;

index into fixed buffers, if used

pack this to avoid bogus arm OABI complaints

ushort buf_group;

for grouped buffer selection

pack this to avoid bogus arm OABI complaints

ushort personality;

personality to use, if used

IOSQE_FIXED_FILE

use fixed fileset

IOSQE_IO_DRAIN

issue after inflight IO

IOSQE_IO_LINK

links next sqe

IOSQE_IO_HARDLINK

like LINK, but stronger

IOSQE_ASYNC

always go async

IOSQE_BUFFER_SELECT

select buffer from sqe.buf_group

IORING_SETUP_IOPOLL

io_context is polled

IORING_SETUP_SQPOLL

SQ poll thread

IORING_SETUP_SQ_AFF

sq_thread_cpu is valid

IORING_SETUP_CQSIZE

app defines CQ size

IORING_SETUP_CLAMP

clamp SQ/CQ ring sizes

IORING_SETUP_ATTACH_WQ

attach to existing wq

IORING_SETUP_R_DISABLED

start with ring disabled

struct io_uring_cqe;

IO completion data structure (Completion Queue Entry)

ulong user_data;

submission passed back

int res;

result code for this event

enum uint IORING_CQE_F_BUFFER;

If set, the upper 16 bits are the buffer ID

struct io_sqring_offsets;

Filled with the offset for mmap(2)

IORING_SQ_NEED_WAKEUP

needs io_uring_enter wakeup

IORING_SQ_CQ_OVERFLOW

CQ ring is overflown

IORING_CQ_EVENTFD_DISABLED

disable eventfd notifications

struct io_uring_params;

Passed in for io_uring_setup(2)

IORING_RESTRICTION_REGISTER_OP

Allow an io_uring_register(2) opcode

IORING_RESTRICTION_SQE_OP

Allow an sqe opcode

IORING_RESTRICTION_SQE_FLAGS_ALLOWED

Allow sqe flags

IORING_RESTRICTION_SQE_FLAGS_REQUIRED

Require sqe flags (these flags must be set on each submission)