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/*
* Copyright (C) 2015-2020 "IoT.bzh"
* Author José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define _GNU_SOURCE
#include <unistd.h>
#include <errno.h>
#include <systemd/sd-event.h>
#include <systemd/sd-bus.h>
#include <systemd/sd-daemon.h>
#include "systemd.h"
static struct sd_bus *sdbusopen(struct sd_bus **p, int (*f)(struct sd_bus **))
{
int rc;
struct sd_bus *r;
r = *p;
if (!r) {
rc = f(&r);
if (rc >= 0) {
rc = sd_bus_attach_event(r, systemd_get_event_loop(), 0);
if (rc < 0) {
sd_bus_unref(r);
r = 0;
}
}
if (rc < 0)
errno = -rc;
*p = r;
}
return r;
}
struct sd_event *systemd_get_event_loop()
{
static struct sd_event *result = 0;
int rc;
if (!result) {
rc = sd_event_new(&result);
if (rc < 0) {
errno = -rc;
result = NULL;
}
}
return result;
}
struct sd_bus *systemd_get_user_bus()
{
static struct sd_bus *result = 0;
return sdbusopen((void*)&result, (void*)sd_bus_open_user);
}
struct sd_bus *systemd_get_system_bus()
{
static struct sd_bus *result = 0;
return sdbusopen((void*)&result, (void*)sd_bus_open_system);
}
static char **fds_names()
{
static char *null;
static char **names;
int rc;
if (!names) {
rc = sd_listen_fds_with_names(1, &names);
if (rc <= 0) {
errno = -rc;
names = &null;
}
}
return names;
}
int systemd_fds_init()
{
errno = 0;
fds_names();
return -!!errno;
}
int systemd_fds_for(const char *name)
{
int idx;
char **names;
names = fds_names();
for (idx = 0 ; names[idx] != NULL ; idx++)
if (!strcmp(name, names[idx]))
return idx + SD_LISTEN_FDS_START;
errno = ENOENT;
return -1;
}
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