// SPDX-License-Identifier: GPL-2.0+

/*

 * Copyright (C) 2014 - 2016 Red Hat, Inc.

 */

#include "nm-default.h"

#include "nm-sd.h"

#include "sd-event.h"

/*****************************************************************************

 * Integrating sd_event into glib. Taken and adjusted from

 * https://www.freedesktop.org/software/systemd/man/sd_event_get_fd.html

 *****************************************************************************/

typedef struct SDEventSource {

	GSource source;

	GPollFD pollfd;

	sd_event *event;

} SDEventSource;

static gboolean

event_prepare (GSource *source, int *timeout_)

{

	return sd_event_prepare (((SDEventSource *) source)->event) > 0;

}

static gboolean

event_check (GSource *source)

{

	return sd_event_wait (((SDEventSource *) source)->event, 0) > 0;

}

static gboolean

event_dispatch (GSource *source, GSourceFunc callback, gpointer user_data)

{

	return sd_event_dispatch (((SDEventSource *) source)->event) > 0;

}

static void

event_finalize (GSource *source)

{

	SDEventSource *s = (SDEventSource *) source;

	sd_event_unref (s->event);

}

static SDEventSource *

event_create_source (sd_event *event)

{

	static const GSourceFuncs event_funcs = {

		.prepare = event_prepare,

		.check = event_check,

		.dispatch = event_dispatch,

		.finalize = event_finalize,

	};

	SDEventSource *source;

	gboolean is_default_event = FALSE;

	int r;

	if (!event) {

		is_default_event = TRUE;

		r = sd_event_default (&event);

		if (r < 0)

			g_return_val_if_reached (NULL);

	}

	source = (SDEventSource *) g_source_new ((GSourceFuncs *) &event_funcs, sizeof (SDEventSource));

	source->event =   is_default_event

	                ? g_steal_pointer (&event)

	                : sd_event_ref (event);

	source->pollfd = (GPollFD) {

	    .fd     = sd_event_get_fd (source->event),

	    .events = G_IO_IN | G_IO_HUP | G_IO_ERR,

	};

	g_source_add_poll (&source->source, &source->pollfd);

	return source;

}

static guint

event_attach (sd_event *event, GMainContext *context)

{

	SDEventSource *source;

	guint id;

	source = event_create_source (event);

	g_return_val_if_fail (source, 0);

	id = g_source_attach ((GSource *) source, context);

	g_source_unref ((GSource *) source);

	nm_assert (id != 0);

	return id;

}

guint

nm_sd_event_attach_default (void)

{

	return event_attach (NULL, NULL);

}

/*****************************************************************************/

/* ensure that defines in nm-sd.h correspond to the internal defines. */

#include "nm-sd-adapt-core.h"

#include "dhcp-lease-internal.h"

/*****************************************************************************/