+/*
+ Copyright 2017 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 <assert.h>
+#include <string.h>
+#include <errno.h>
+
+#include <systemd/sd-daemon.h>
+
+static int init_done;
+static char *null;
+static char **names;
+
+int sd_fds_init()
+{
+ int rc;
+
+ if (init_done)
+ rc = 0;
+ else {
+ init_done = 1;
+ rc = sd_listen_fds_with_names(1, &names);
+ if (rc < 0) {
+ errno = -rc;
+ rc = -1;
+ names = &null;
+ }
+ }
+ return rc;
+}
+
+int sd_fds_count()
+{
+ int count;
+
+ assert(init_done);
+ for (count = 0 ; names[count] != NULL ; count++);
+ return count;
+}
+
+int sd_fds_for(const char *name)
+{
+ int idx;
+
+ assert(init_done);
+ for (idx = 0 ; names[idx] != NULL ; idx++)
+ if (!strcmp(name, names[idx]))
+ return idx + SD_LISTEN_FDS_START;
+
+ errno = ENOENT;
+ return -1;
+}
+