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/* Copyright (c) 2018, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include <sstream>
// build with -DWITH_SYSTEMD_DEBUG=1 as needed!
namespace sysd {
void notify_connect();
void notify();
template <typename T, typename... Ts>
inline void notify(T, Ts...);
/**
Class wrapping the "globals" as static members so that they can only
be accessed from the friend-declared notify functions.
*/
class NotifyGlobals {
static int socket;
static std::stringstream fmt;
NotifyGlobals() = delete;
friend void notify_connect();
friend void notify();
template <typename T, typename... Ts>
friend void notify(T t, Ts... ts);
};
/**
Takes a variable number of arguments of different type and formats
them on NotifyGlobals::fmt, and sends result to notification socket.
@param t current argument to format
@param ts remaining args parameter pack for recursive call
*/
template <typename T, typename... Ts>
inline void notify(T t [[maybe_unused]], Ts... ts [[maybe_unused]]) {
#ifndef _WIN32
#ifndef WITH_SYSTEMD_DEBUG
if (NotifyGlobals::socket == -1) {
return;
}
#endif /* WITH_SYSTEMD_DEBUG */
NotifyGlobals::fmt << t;
notify(ts...);
#endif /* not defined _WIN32 */
}
} // namespace sysd
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