sem_t

pub const sem_t = switch (native_os) {
    .linux, .emscripten => extern struct {
        __size: [4 * @sizeOf(usize)]u8 align(@alignOf(usize)),
    },
    .driverkit, .ios, .maccatalyst, .macos, .tvos, .visionos, .watchos => c_int,
    .freebsd => extern struct {
        _magic: u32,
        _kern: extern struct {
            _count: u32,
            _flags: u32,
        },
        _padding: u32,
    },
    .illumos => extern struct {
        count: u32 = 0,
        type: u16 = 0,
        magic: u16 = 0x534d,
        __pad1: [3]u64 = @splat(0),
        __pad2: [2]u64 = @splat(0),
    },
    .openbsd, .netbsd, .dragonfly => ?*opaque {},
    .haiku => extern struct {
        type: i32,
        u: extern union {
            named_sem_id: i32,
            unnamed_sem: i32,
        },
        padding: [2]i32,
    },
    // https://github.com/SerenityOS/serenity/blob/aae106e37b48f2158e68902293df1e4bf7b80c0f/Userland/Libraries/LibC/semaphore.h#L23-L27
    .serenity => extern struct {
        magic: u32,
        value: u32,
        flags: u8,
    },
    else => void,
}