Westermo service starter and supervisor, inspired by daemontools

finit.c:
        o New service and shell_service stanzas for finit.conf
        o Run service_startup() before /etc/finit.d/ hooks
        o Run service_monitor() at end of startup

helpers.c:
        o Several new functions:
          - print_desc() displays a service starting up
          - print_result() shows if service started OK or not
          - start_process() is used by the services framework

svc.c:
        Generic API for managing svc_t structures

ipc.o:
        TIPC based framework for communicating with the service monitor.
        E.g., to relay (re)configuration signals from a Web/CLI
        front-end via finit to one or many setup daemons, and back.

services.c:
        Service monitor framework

strlcpy.c:
        Secure strncpy() replacement from OpenBSD under the free ISC License.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

svc.c

@@ -0,0 +1,111 @@
+/* Generic API for managing svc_t structures
+ *
+ * Copyright (c) 2008-2010  Claudio Matsuoka <cmatsuoka@gmail.com>
+ * Copyright (c) 2008-2012  Joachim Nilsson <troglobit@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <string.h>
+
+#include "finit.h"
+#include "svc.h"
+
+/* The registered services are kept in shared memory for easy read-only access
+ * by 3rd party APIs.  Mostly because of the ability to, from the outside, query
+ * liveness state of all daemons that should run. */
+static int svc_counter = 0;		/* Number of registered services to monitor. */
+static svc_t *services = NULL;          /* List of registered services, in shared memory. */
+
+/* Connect to/create shared memory area of registered servies */
+static void __connect_shm(void)
+{
+	if (!services) {
+		services = finit_connect_shm();
+		if (!services) {
+			/* This should never happen, but if it does we're probably
+			 * knee-deep in more serious problems already... */
+			_e("Failed setting up shared memory for service monitor.\n");
+			abort();
+		}
+	}
+}
+
+svc_t *svc_new_service (void)
+{
+	svc_t *svc = NULL;
+
+	__connect_shm();
+	if (svc_counter < MAX_NUM_SVC) {
+		svc = &services[svc_counter++];
+		memset(svc, 0, sizeof(*svc));
+	}
+
+	return svc;
+}
+
+svc_t *svc_find_by_id (int id)
+{
+	__connect_shm();
+	if (id >= svc_counter)
+		return NULL;
+
+	return &services[id];
+}
+
+svc_t *svc_find_by_name (char *name)
+{
+	int i;
+
+	__connect_shm();
+	for (i = 0; i < svc_counter; i++) {
+		svc_t *svc = &services[i];
+
+		if (!strncmp(name, svc->cmd, strlen(svc->cmd))) {
+			_d("Found a matching svc for %s", name);
+			return svc;
+		}
+	}
+
+	return NULL;
+}
+
+/* Iterates over all registered services. Get first svc_t by setting @restart */
+svc_t *svc_iterator (int restart)
+{
+	static int id = 0;
+
+	__connect_shm();
+	if (restart)
+		id = 0;
+
+	if (id >= svc_counter)
+		return NULL;
+
+	return &services[id++];
+}
+
+/**
+ * Local Variables:
+ *  compile-command: "gcc -g -DUNITTEST -o unittest svc.c"
+ *  version-control: t
+ *  indent-tabs-mode: t
+ *  c-file-style: "linux"
+ * End:
+ */