Beginning of integration as systemd service

This allows to receive socket activation by names.

Change-Id: I6896dec785e8d434da452ed2d1341016f6eadb60
Signed-off-by: José Bollo <jose.bollo@iot.bzh>

4 files changed, 100 insertions, 2 deletions

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 08a22901..8d0121a5 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -81,6 +81,7 @@ ADD_LIBRARY(afb-lib STATIC
 	locale-root.c
 	verbose.c
 	websock.c
+	sd-fds.c
 )
 
 ###########################################
diff --git a/src/main.c b/src/main.c
index 4ae8af5e..f1ebd969 100644
--- a/src/main.c
+++ b/src/main.c
@@ -30,6 +30,8 @@
 #include <systemd/sd-event.h>
 #include <systemd/sd-daemon.h>
 
+#include <afb/afb-binding.h>
+
 #include "afb-config.h"
 #include "afb-hswitch.h"
 #include "afb-apis.h"
@@ -45,8 +47,7 @@
 #include "verbose.h"
 #include "afb-common.h"
 #include "afb-hook.h"
-
-#include <afb/afb-binding.h>
+#include "sd-fds.h"
 
 /*
    if SELF_PGROUP == 0 the launched command is the group leader
@@ -359,6 +360,8 @@ int main(int argc, char *argv[])
 
 	LOGAUTH("afb-daemon");
 
+	sd_fds_init();
+
 	// ------------- Build session handler & init config -------
 	config = afb_config_parse_arguments(argc, argv);
 	atexit(exit_handler);
diff --git a/src/sd-fds.c b/src/sd-fds.c
new file mode 100644
index 00000000..477da520
--- /dev/null
+++ b/src/sd-fds.c
@@ -0,0 +1,70 @@
+/*
+ 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;
+}
+
diff --git a/src/sd-fds.h b/src/sd-fds.h
new file mode 100644
index 00000000..f2386a85
--- /dev/null
+++ b/src/sd-fds.h
@@ -0,0 +1,24 @@
+/*
+ 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.
+*/
+
+#pragma once
+
+extern int sd_fds_init();
+extern int sd_fds_count();
+extern int sd_fds_for(const char *name);
+