/*
 * call-seq:
 *
 *      Kgio.accept_cloexec = true
 *      Kgio.accept_cloexec = false
 *
 * Sets whether or not Kgio::Socket objects created by
 * TCPServer#kgio_accept,
 * TCPServer#kgio_tryaccept,
 * UNIXServer#kgio_accept,
 * and UNIXServer#kgio_tryaccept
 * default to being created with the FD_CLOEXEC file descriptor flag.
 *
 * This is on by default, as there is little reason to deal to enable
 * it for client sockets on a socket server.
 */
static VALUE set_cloexec(VALUE mod, VALUE boolean)
{
        switch (TYPE(boolean)) {
        case T_TRUE:
                accept4_flags |= SOCK_CLOEXEC;
                return boolean;
        case T_FALSE:
                accept4_flags &= ~SOCK_CLOEXEC;
                return boolean;
        }
        rb_raise(rb_eTypeError, "not true or false");
        return Qnil;
}