End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Zlib::GzipFile#os_code

os_code

static VALUE
rb_gzfile_os_code(VALUE obj)
{
    return INT2FIX(get_gzfile(obj)->os_code);
}

Returns OS code number recorded in the gzip file header.

See also #orig_name #sync #mtime #sync= also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0