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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* 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 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright (C) 2014 Red Hat, Inc.
*/
#include "config.h"
#include <glib.h>
#include <unistd.h>
#include <errno.h>
#include "sd-event.h"
#include "time-util.h"
struct sd_event_source {
guint refcount;
guint id;
gpointer user_data;
GIOChannel *channel;
union {
struct {
sd_event_io_handler_t cb;
} io;
struct {
sd_event_time_handler_t cb;
uint64_t usec;
} time;
};
};
static struct sd_event_source *
source_new (void)
{
struct sd_event_source *source;
source = g_slice_new0 (struct sd_event_source);
source->refcount = 1;
return source;
}
int
sd_event_source_set_priority (sd_event_source *s, int64_t priority)
{
return 0;
}
sd_event_source*
sd_event_source_unref (sd_event_source *s)
{
if (!s)
return NULL;
g_return_val_if_fail (s->refcount, NULL);
s->refcount--;
if (s->refcount == 0) {
if (s->id)
g_source_remove (s->id);
if (s->channel) {
/* Don't shut down the channel since systemd will soon close
* the file descriptor itself, which would cause -EBADF.
*/
g_io_channel_unref (s->channel);
}
g_slice_free (struct sd_event_source, s);
}
return NULL;
}
int
sd_event_source_set_description(sd_event_source *s, const char *description)
{
if (!s)
return -EINVAL;
g_source_set_name_by_id (s->id, description);
return 0;
}
static gboolean
io_ready (GIOChannel *channel, GIOCondition condition, struct sd_event_source *source)
{
int r, revents = 0;
gboolean result;
if (condition & G_IO_IN)
revents |= EPOLLIN;
if (condition & G_IO_OUT)
revents |= EPOLLOUT;
if (condition & G_IO_PRI)
revents |= EPOLLPRI;
if (condition & G_IO_ERR)
revents |= EPOLLERR;
if (condition & G_IO_HUP)
revents |= EPOLLHUP;
source->refcount++;
r = source->io.cb (source, g_io_channel_unix_get_fd (channel), revents, source->user_data);
if (r < 0 || source->refcount <= 1) {
source->id = 0;
result = G_SOURCE_REMOVE;
} else
result = G_SOURCE_CONTINUE;
sd_event_source_unref (source);
return result;
}
int
sd_event_add_io (sd_event *e, sd_event_source **s, int fd, uint32_t events, sd_event_io_handler_t callback, void *userdata)
{
struct sd_event_source *source;
GIOChannel *channel;
GIOCondition condition = 0;
/* systemd supports floating sd_event_source by omitting the @s argument.
* We don't have such users and don't implement floating references. */
g_return_val_if_fail (s, -EINVAL);
channel = g_io_channel_unix_new (fd);
if (!channel)
return -EINVAL;
source = source_new ();
source->io.cb = callback;
source->user_data = userdata;
source->channel = channel;
if (events & EPOLLIN)
condition |= G_IO_IN;
if (events & EPOLLOUT)
condition |= G_IO_OUT;
if (events & EPOLLPRI)
condition |= G_IO_PRI;
if (events & EPOLLERR)
condition |= G_IO_ERR;
if (events & EPOLLHUP)
condition |= G_IO_HUP;
g_io_channel_set_encoding (source->channel, NULL, NULL);
g_io_channel_set_buffered (source->channel, FALSE);
source->id = g_io_add_watch (source->channel, condition, (GIOFunc) io_ready, source);
*s = source;
return 0;
}
static gboolean
time_ready (struct sd_event_source *source)
{
int r;
gboolean result;
source->refcount++;
r = source->time.cb (source, source->time.usec, source->user_data);
if (r < 0 || source->refcount <= 1) {
source->id = 0;
result = G_SOURCE_REMOVE;
} else
result = G_SOURCE_CONTINUE;
sd_event_source_unref (source);
return result;
}
int
sd_event_add_time(sd_event *e, sd_event_source **s, clockid_t clock, uint64_t usec, uint64_t accuracy, sd_event_time_handler_t callback, void *userdata)
{
struct sd_event_source *source;
uint64_t n = now (clock);
/* systemd supports floating sd_event_source by omitting the @s argument.
* We don't have such users and don't implement floating references. */
g_return_val_if_fail (s, -EINVAL);
source = source_new ();
source->time.cb = callback;
source->user_data = userdata;
source->time.usec = usec;
if (usec > 1000)
usec = n < usec - 1000 ? usec - n : 1000;
source->id = g_timeout_add (usec / 1000, (GSourceFunc) time_ready, source);
*s = source;
return 0;
}
/* sd_event is basically a GMainContext; but since we only
* ever use the default context, nothing to do here.
*/
int
sd_event_default (sd_event **e)
{
*e = GUINT_TO_POINTER (1);
return 0;
}
sd_event*
sd_event_ref (sd_event *e)
{
return e;
}
sd_event*
sd_event_unref (sd_event *e)
{
return NULL;
}
int
sd_event_now (sd_event *e, clockid_t clock, uint64_t *usec)
{
*usec = now (clock);
return 0;
}
int asynchronous_close(int fd) {
safe_close(fd);
return -1;
}
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