utils-systemd: introduction of systemd interface

[src/app-framework-main.git] / src / utils-systemd.c

diff --git a/src/utils-systemd.c b/src/utils-systemd.c
new file mode 100644 (file)
index 0000000..757a52c
--- /dev/null
+++ b/src/utils-systemd.c
@@ -0,0 +1,77 @@
+/*
+ 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 <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <poll.h>
+#include <assert.h>
+
+#include <systemd/sd-bus.h>
+#include <systemd/sd-bus-protocol.h>
+
+#include "utils-systemd.h"
+
+#if !defined(SYSTEMD_UNITS_ROOT)
+# define SYSTEMD_UNITS_ROOT "/usr/local/lib/systemd"
+#endif
+
+int systemd_get_unit_path(char *path, size_t pathlen, int isuser, const char *unit, const char *uext)
+{
+       int rc = snprintf(path, pathlen, "%s/%s/%s.%s", 
+                       SYSTEMD_UNITS_ROOT,
+                       isuser ? "user" : "system",
+                       unit,
+                       uext);
+
+       if (rc >= 0 && (size_t)rc >= pathlen) {
+               errno = ENAMETOOLONG;
+               rc = -1;
+       }
+       return rc;
+}
+
+int systemd_get_wants_path(char *path, size_t pathlen, int isuser, const char *wanter, const char *unit, const char *uext)
+{
+       int rc = snprintf(path, pathlen, "%s/%s/%s.wants/%s.%s", 
+                       SYSTEMD_UNITS_ROOT,
+                       isuser ? "user" : "system",
+                       wanter,
+                       unit,
+                       uext);
+
+       if (rc >= 0 && (size_t)rc >= pathlen) {
+               errno = ENAMETOOLONG;
+               rc = -1;
+       }
+       return rc;
+}
+
+int systemd_get_wants_target(char *path, size_t pathlen, const char *unit, const char *uext)
+{
+       int rc = snprintf(path, pathlen, "../%s.%s", unit, uext);
+
+       if (rc >= 0 && (size_t)rc >= pathlen) {
+               errno = ENAMETOOLONG;
+               rc = -1;
+       }
+       return rc;
+}
+