Merge pull request #6356 from jorangreef/io_uring

std: add io_uring library

lib/std/os/bits/linux.zig

@@ -1200,6 +1200,8 @@ pub const IORING_FEAT_NODROP = 1 << 1;
 pub const IORING_FEAT_SUBMIT_STABLE = 1 << 2;
 pub const IORING_FEAT_RW_CUR_POS = 1 << 3;
 pub const IORING_FEAT_CUR_PERSONALITY = 1 << 4;
+pub const IORING_FEAT_FAST_POLL = 1 << 5;
+pub const IORING_FEAT_POLL_32BITS = 1 << 6;
 
 // io_uring_params.flags
 
@@ -1252,6 +1254,9 @@ pub const io_sqring_offsets = extern struct {
 /// needs io_uring_enter wakeup
 pub const IORING_SQ_NEED_WAKEUP = 1 << 0;
 
+/// kernel has cqes waiting beyond the cq ring
+pub const IORING_SQ_CQ_OVERFLOW = 1 << 1;
+
 pub const io_cqring_offsets = extern struct {
     head: u32,
     tail: u32,
@@ -1263,48 +1268,19 @@ pub const io_cqring_offsets = extern struct {
 };
 
 pub const io_uring_sqe = extern struct {
-    pub const union1 = extern union {
-        off: u64,
-        addr2: u64,
-    };
-
-    pub const union2 = extern union {
-        rw_flags: kernel_rwf,
-        fsync_flags: u32,
-        poll_events: u16,
-        sync_range_flags: u32,
-        msg_flags: u32,
-        timeout_flags: u32,
-        accept_flags: u32,
-        cancel_flags: u32,
-        open_flags: u32,
-        statx_flags: u32,
-        fadvise_flags: u32,
-    };
-
-    pub const union3 = extern union {
-        struct1: extern struct {
-            /// index into fixed buffers, if used
-            buf_index: u16,
-
-            /// personality to use, if used
-            personality: u16,
-        },
-        __pad2: [3]u64,
-    };
     opcode: IORING_OP,
     flags: u8,
     ioprio: u16,
     fd: i32,
-
-    union1: union1,
+    off: u64,
     addr: u64,
     len: u32,
-
-    union2: union2,
+    rw_flags: u32,
     user_data: u64,
-
-    union3: union3,
+    buf_index: u16,
+    personality: u16,
+    splice_fd_in: i32,
+    __pad2: [2]u64
 };
 
 pub const IOSQE_BIT = extern enum(u8) {
@@ -1313,7 +1289,8 @@ pub const IOSQE_BIT = extern enum(u8) {
     IO_LINK,
     IO_HARDLINK,
     ASYNC,
-
+    BUFFER_SELECT,
+    
     _,
 };
 
@@ -1332,7 +1309,10 @@ pub const IOSQE_IO_LINK = 1 << @enumToInt(IOSQE_BIT.IO_LINK);
 pub const IOSQE_IO_HARDLINK = 1 << @enumToInt(IOSQE_BIT.IO_HARDLINK);
 
 /// always go async
-pub const IOSQE_ASYNC = 1 << IOSQE_BIT.ASYNC;
+pub const IOSQE_ASYNC = 1 << @enumToInt(IOSQE_BIT.ASYNC);
+
+/// select buffer from buf_group
+pub const IOSQE_BUFFER_SELECT = 1 << @enumToInt(IOSQE_BIT.BUFFER_SELECT);
 
 pub const IORING_OP = extern enum(u8) {
     NOP,
@@ -1365,6 +1345,10 @@ pub const IORING_OP = extern enum(u8) {
     RECV,
     OPENAT2,
     EPOLL_CTL,
+    SPLICE,
+    PROVIDE_BUFFERS,
+    REMOVE_BUFFERS,
+    TEE,
 
     _,
 };

lib/std/os/bits/linux/mips.zig

@@ -383,6 +383,9 @@ pub const SYS = extern enum(usize) {
     statx = Linux + 366,
     rseq = Linux + 367,
     io_pgetevents = Linux + 368,
+    io_uring_setup = Linux + 425,
+    io_uring_enter = Linux + 426,
+    io_uring_register = Linux + 427,
     openat2 = Linux + 437,
     pidfd_getfd = Linux + 438,
 

lib/std/os/linux.zig

@@ -31,6 +31,7 @@ pub usingnamespace switch (builtin.arch) {
 pub usingnamespace @import("bits.zig");
 pub const tls = @import("linux/tls.zig");
 pub const BPF = @import("linux/bpf.zig");
+pub usingnamespace @import("linux/io_uring.zig");
 
 /// Set by startup code, used by `getauxval`.
 pub var elf_aux_maybe: ?[*]std.elf.Auxv = null;