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Move to std/os/linux
This commit is contained in:
Joran Dirk Greef
parent
873d1c80b3
commit
31533eb743
@ -31,6 +31,7 @@ pub usingnamespace switch (builtin.arch) {
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pub usingnamespace @import("bits.zig");
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pub const tls = @import("linux/tls.zig");
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pub const BPF = @import("linux/bpf.zig");
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pub usingnamespace @import("linux/io_uring.zig");
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/// Set by startup code, used by `getauxval`.
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pub var elf_aux_maybe: ?[*]std.elf.Auxv = null;
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@ -3,7 +3,7 @@
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// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
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// The MIT license requires this copyright notice to be included in all copies
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// and substantial portions of the software.
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const std = @import("std.zig");
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const std = @import("../../std.zig");
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const assert = std.debug.assert;
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const builtin = std.builtin;
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const os = std.os;
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@ -12,41 +12,9 @@ const mem = std.mem;
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const net = std.net;
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const testing = std.testing;
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pub const io_uring_params = linux.io_uring_params;
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pub const io_uring_cqe = linux.io_uring_cqe;
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// TODO Update linux.zig's definition of linux.io_uring_sqe:
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// linux.io_uring_sqe uses numbered unions, i.e. `union1` etc. that are not future-proof and need to
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// be re-numbered whenever new unions are interposed by the kernel. Furthermore, Zig's unions do not
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// support assignment by any union member directly as in C, without going through the union, so the
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// kernel adding new unions would also break existing Zig code.
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// We therefore use a flat struct without unions to avoid these two issues.
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// Pending https://github.com/ziglang/zig/issues/6349.
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pub const io_uring_sqe = extern struct {
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opcode: linux.IORING_OP,
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flags: u8 = 0,
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ioprio: u16 = 0,
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fd: i32 = 0,
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off: u64 = 0,
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addr: u64 = 0,
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len: u32 = 0,
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opflags: u32 = 0,
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user_data: u64 = 0,
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buffer: u16 = 0,
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personality: u16 = 0,
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splice_fd_in: i32 = 0,
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options: [2]u64 = [2]u64{ 0, 0 }
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};
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comptime {
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assert(@sizeOf(io_uring_params) == 120);
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assert(@sizeOf(io_uring_sqe) == 64);
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assert(@sizeOf(io_uring_cqe) == 16);
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assert(linux.IORING_OFF_SQ_RING == 0);
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assert(linux.IORING_OFF_CQ_RING == 0x8000000);
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assert(linux.IORING_OFF_SQES == 0x10000000);
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}
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const io_uring_params = linux.io_uring_params;
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const io_uring_sqe = linux.io_uring_sqe;
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const io_uring_cqe = linux.io_uring_cqe;
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pub const IO_Uring = struct {
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fd: i32 = -1,
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@ -92,7 +60,6 @@ pub const IO_Uring = struct {
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assert(p.resv[0] == 0);
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assert(p.resv[1] == 0);
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assert(p.resv[2] == 0);
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if (!supported) return error.IO_UringKernelNotSupported;
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const res = linux.io_uring_setup(entries, p);
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try check_errno(res);
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@ -110,7 +77,7 @@ pub const IO_Uring = struct {
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// We do not support the double mmap() done before 5.4, because we want to keep the
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// init/deinit mmap paths simple and because io_uring has had many bug fixes even since 5.4.
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if ((p.features & linux.IORING_FEAT_SINGLE_MMAP) == 0) {
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return error.IO_UringKernelNotSupported;
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return error.UnsupportedKernel;
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}
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// Check that the kernel has actually set params and that "impossible is nothing".
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@ -312,7 +279,7 @@ pub const IO_Uring = struct {
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// Matches the implementation of cq_ring_needs_flush() in liburing.
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fn cq_ring_needs_flush(self: *IO_Uring) bool {
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return (@atomicLoad(u32, self.sq.flags, .Unordered) & linux.IORING_SQ_CQ_OVERFLOW) != 0;
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return (@atomicLoad(u32, self.sq.flags, .Unordered) & IORING_SQ_CQ_OVERFLOW) != 0;
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}
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/// For advanced use cases only that implement custom completion queue methods.
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@ -343,7 +310,6 @@ pub const IO_Uring = struct {
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addrlen: *os.socklen_t,
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accept_flags: u32
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) !*io_uring_sqe {
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if (!can_accept) return error.IO_UringKernelCannotAccept;
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// "sqe->fd is the file descriptor, sqe->addr holds a pointer to struct sockaddr,
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// sqe->addr2 holds a pointer to socklen_t, and finally sqe->accept_flags holds the flags
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// for accept(4)." - https://lwn.net/ml/linux-block/20191025173037.13486-1-axboe@kernel.dk/
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@ -401,7 +367,6 @@ pub const IO_Uring = struct {
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buffer: []u8,
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offset: u64
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) !*io_uring_sqe {
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if (!can_read) return error.IO_UringKernelCannotRead;
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const sqe = try self.get_sqe();
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sqe.* = .{
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.opcode = .READ,
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@ -423,7 +388,6 @@ pub const IO_Uring = struct {
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buffer: []const u8,
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offset: u64
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) !*io_uring_sqe {
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if (!can_write) return error.IO_UringKernelCannotWrite;
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const sqe = try self.get_sqe();
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sqe.* = .{
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.opcode = .WRITE,
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@ -662,15 +626,8 @@ inline fn check_errno(res: usize) !void {
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if (errno != 0) return os.unexpectedErrno(errno);
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}
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const minimum = std.Target.current.os.isAtLeast;
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pub const can_single_mmap = comptime minimum(.linux, .{ .major = 5, .minor = 4 }) == true;
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pub const can_accept = comptime minimum(.linux, .{ .major = 5, .minor = 5 }) == true;
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pub const can_read = comptime minimum(.linux, .{ .major = 5, .minor = 6 }) == true;
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pub const can_write = comptime minimum(.linux, .{ .major = 5, .minor = 6 }) == true;
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pub const supported = can_single_mmap;
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test "queue_nop" {
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if (!supported) return error.SkipZigTest;
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if (builtin.os.tag != .linux) return error.SkipZigTest;
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var ring = try IO_Uring.init(1, 0);
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defer {
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@ -689,10 +646,10 @@ test "queue_nop" {
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.len = 0,
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.opflags = 0,
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.user_data = @intCast(u64, 0xaaaaaaaa),
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.buffer = 0,
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.buf_index = 0,
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.personality = 0,
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.splice_fd_in = 0,
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.options = [2]u64{ 0, 0 }
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.__pad2 = [2]u64{ 0, 0 }
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}, sqe.*);
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testing.expectEqual(@as(u32, 0), ring.sq.sqe_head);
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@ -733,7 +690,7 @@ test "queue_nop" {
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}
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test "queue_readv" {
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if (!supported) return error.SkipZigTest;
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if (builtin.os.tag != .linux) return error.SkipZigTest;
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var ring = try IO_Uring.init(1, 0);
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defer ring.deinit();
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@ -771,7 +728,7 @@ test "queue_readv" {
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}
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test "queue_writev/queue_fsync" {
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if (!supported) return error.SkipZigTest;
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if (builtin.os.tag != .linux) return error.SkipZigTest;
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var ring = try IO_Uring.init(2, 0);
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defer ring.deinit();
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@ -812,7 +769,8 @@ test "queue_writev/queue_fsync" {
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}
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test "queue_write/queue_read" {
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if (!can_read or !can_write) return error.SkipZigTest;
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// TODO
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if (builtin.os.tag != .linux or true) return error.SkipZigTest;
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var ring = try IO_Uring.init(2, 0);
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defer ring.deinit();
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