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>

service.h

@@ -0,0 +1,92 @@
+/* Service starter and supervisor, inspired by daemontools
+ *
+ * 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.
+ */
+
+#ifndef FINIT_SERVICES_H_
+#define FINIT_SERVICES_H_
+
+#include <errno.h>
+#include <sys/shm.h>		/* shmat() */
+#include <sys/types.h>		/* pid_t */
+
+#include "finit.h"
+
+#define FINIT_SHM_ID     0x494E4954  /* "INIT", see ascii(7) */
+#define MAX_NUM_SVC      64	     /* Enough? */
+#define MAX_NUM_SVC_ARGS 16
+
+/* Default enable for all services, can be stopped by means
+ * of issuing an initctl call. E.g.
+ *   initctl service <stop|start|restart> */
+typedef struct svc {
+	char	       cmd[64];
+	char	       args[MAX_NUM_SVC_ARGS][64];
+	char	       descr[64];
+	pid_t	       pid;
+	int	       reload;
+	int	       private;	/* For svc callbacks to use freely, possibly to store "states". */
+	/* Set for known services, otherwise "empty". */
+	struct svc_map {
+		char *path;		      /* E.g., "/sbin/snmpd" */
+		int (*cb)(struct svc *, int); /* Service callback, e.g. is_snmpd_enabled() */
+		int   dyn_reload;	      /* Reload on new dynamic event. */
+		int   dyn_workaround;	      /* Ugly/Temporary workaround for dyn-stop/start of serialoverip. */
+		int   vlans_changed_reload;   /* Reload when VLANs change. */
+	} reg;
+} svc_t;
+
+typedef struct svc_map svc_map_t;
+
+/* Put services array in shm */
+static inline svc_t *finit_connect_shm(void)
+{
+	const long ID = FINIT_SHM_ID;
+	static void *ptr = (void *)-1;
+
+	if ((void *)-1 == ptr) {
+		ptr = shmat (shmget (ID, sizeof(svc_t) * MAX_NUM_SVC, 0600 | IPC_CREAT), NULL, 0);
+		if ((void *)-1 == ptr) {
+			_d("Failed allocating shared memory, error %d: %s", errno, strerror (errno));
+			return NULL;
+		}
+	}
+
+	return (svc_t *)ptr;
+}
+
+int     service_register      (char *line);
+int     service_start	      (svc_t *svc);
+int     service_start_by_name (char *name);
+int     service_enabled	      (svc_t *svc, int dynamic);
+void    service_startup	      (void);
+void    service_monitor	      (void);
+
+#endif	/* FINIT_SERVICES_H_ */
+
+/**
+ * Local Variables:
+ *  version-control: t
+ *  indent-tabs-mode: t
+ *  c-file-style: "linux"
+ * End:
+ */