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std: add io_uring library#6356

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andrewrk merged 50 commits intoziglang:masterziglang/zig:masterfrom jorangreef:io_uringCopy head branch name to clipboardOct 29, 2020

+1,243-37

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Commits on Sep 16, 2020

• std: add io_uring library

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• Add short license and copyright notice

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• Check kernel support for single_mmap, accept, and read/write

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Commits on Sep 17, 2020

• Use != 0 for bitwise flag conditions

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• Remove comment

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• Add IORING_SQ_CQ_OVERFLOW to std/os/bits/linux.zig

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• Use std.builtin

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• Use x.y for C-style x->y instead of x.*.y

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Commits on Sep 19, 2020

• @ptrCast fds.ptr to *const c_void for io_uring_register()

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• Do not register /dev/zero as an fd when testing queue_readv()

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• Test IORING_REGISTER_FILES but avoid sparse fd sets

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• Fix std @import

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• Add splice_fd_in to io_uring_sqe and future-proof for anonymous unions

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• Move to std/os/linux

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• Use linux.IORING_SQ_CQ_OVERFLOW

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• Remove dangling @import from std

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• Return error.UnsupportedKernel for ENOSYS

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• Remove unused import aliases

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• Rename to error.SubmissionQueueFull

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• Allow the kernel to drive feature detection

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• Remove default values from io_uring_sqe struct

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• Zero the SQE slot and assign, instead of initializing with default values

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• Upgrade check_errno() to an exhaustive switch (safer)

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• Fix io_uring_sqe to use the names of the first member of each union

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Commits on Sep 20, 2020

• Handle all possible syscall errors and bring errors in line with os.zig

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• Use os.fd_t instead of i32 and assert against c_int for syscall safety

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• Fix opcode support detection for read/write test

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• Add safety checks

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• Make enter(), flush_sq(), sq_ring_needs_enter(), cq_ring_needs_flush() public

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• Test structs and offsets

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• Add IORING_FEAT_FAST_POLL

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Commits on Sep 21, 2020

• Add io_uring syscalls to os.bits.linux.mips.SYS

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• Cache mask instead of dereferencing mask pointer

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• Use @intcast instead of @truncate on io_uring_enter() result

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• Add flags to queue_fsync() signature as per liburing

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• Use @intcast instead of @truncate

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• Define SPLICE, PROVIDE_BUFFERS, REMOVE_BUFFERS and TEE opcodes and flags

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Commits on Oct 3, 2020

• Handle EBADFD (ring fd in bad state) in enter()

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• Use load acquire semantics when reading the SQPOLL wakeup flag

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• Add IORING_FEAT_POLL_32BITS

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Commits on Oct 4, 2020

• Expose available kernel features

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• Limit entries to u12, add errors for invalid entries, use mem.zeroInit

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• Allow for advanced non-sequential SQE allocation schemes

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• Use load relaxed semantics when reading the SQPOLL wakeup flag

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• Add openat(), close(), connect(), send(), recv(), as well as tests

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• Improve openat/accept test debugging

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• Skip openat test only for older kernels that do not fully support AT_FDCWD

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• Use const wherever possible

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• Split openat/close test into two separate tests

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Commits on Oct 5, 2020

• Test the range of user_data bits

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