turbonss/lib/cgroup.zig

const meta = @import("std").meta;

// All string fields are 0-terminated, but that's not part of the type.
// members field is null-terminated, but that's also not part of the type.
// Making it part of the type crashes zig compiler in pre-0.10.
// https://github.com/ziglang/zig/issues/7517

pub const CGroup = struct {
    gid: u32,
    // should be [*:0]const u8
    name: [*]const u8,
    // Should be [*:null]align(1) const ?[*:0]const u8
    members: []align(1) const ?[*:0]const u8,

    pub fn ptr(self: *const CGroup) CGroupPtr {
        return CGroupPtr{
            .gid = self.gid,
            .name = self.name,
            .members = @intToPtr([*]const u8, @ptrToInt(self.members.ptr)),
        };
    }
};

// size of the pointer to a single member.
pub const ptr_size = @sizeOf(meta.Child(meta.fieldInfo(CGroup, .members).field_type));

// a workaround of not having sentinel-terminated `name` and `members`.
pub const CGroupPtr = extern struct {
    gid: u32,
    name: [*]const u8,
    members: [*]const u8,
};