FileTest#setuid?

(::path | ::io file_name) -> bool

File.setuid?(file_name) → true or false

static VALUE
rb_file_suid_p(VALUE obj, VALUE fname)
{
#ifdef S_ISUID
    return check3rdbyte(fname, S_ISUID);
#else
    return Qfalse;
#endif
}

Returns true if the named file has the setuid bit set.

file_name can be an IO object.

See also #setgid? #size #readable_real? #size? also in 4.1 · 4.0 · 3.3 · 3.2 · 3.1 · 3.0