ACCMODE

pub const ACCMODE = switch (native_os) {
    // POSIX has a note about the access mode values:
    //
    // In historical implementations the value of O_RDONLY is zero. Because of
    // that, it is not possible to detect the presence of O_RDONLY and another
    // option. Future implementations should encode O_RDONLY and O_WRONLY as
    // bit flags so that: O_RDONLY | O_WRONLY == O_RDWR
    //
    // In practice SerenityOS is the only system supported by Zig that
    // implements this suggestion.
    // https://github.com/SerenityOS/serenity/blob/4adc51fdf6af7d50679c48b39362e062f5a3b2cb/Kernel/API/POSIX/fcntl.h#L28-L30
    .serenity => enum(u2) {
        NONE = 0,
        RDONLY = 1,
        WRONLY = 2,
        RDWR = 3,
    },
    else => enum(u2) {
        RDONLY = 0,
        WRONLY = 1,
        RDWR = 2,
    },
}