Convert finit to use libev and fix so plugin ctors runs on dlopen().

Lots of cleanup and simplification of the main code in this commit.
Most notably libev has been added to take care of the main loop and
monitor services. Still TODO is migrating to use the libev signal
handling.

Convert initctl.c:listen_initctl() to a plugin instead.  This also
meant introducing a new form of I/O plugin to finit, also handled
by libev.

Load plugins *after* we've setup the base filesystem (BASEFS) in case
plugins reside on a filesystem not reachable before "mount -a" has run.
This also has the side effect of lining up nicely with the first level
plugin hooks.

If a plugin wants to hook up with a loded service we connect them by
their respective numeric IDs in plugin_register().  I.e., the service
monitor checks if a service has a registered callback, which in turn
decides if a service should be started, stopped or reloaded.

Rip out old EeePC distribution defines from finit.h, none of it really
applies anymore.  If you need distribution specific settings this is
the place to put them.

Make hookpoint names (#defines) clearer: after BASEFS, after networking,
after all setup, etc.

Use #inlude_next <signal.h> in signal.h to include system header file!

Simplify service monitor: move essential code to svc.c and rip out
the TIPC dependency. Write your own service.so plugin, or wait for
a more complete example of how to extend service monitoring using
the primitives in svc.c

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

svc.h

@@ -22,17 +22,86 @@
  * THE SOFTWARE.
  */
 
-#ifndef FINIT_SVC_H__
-#define FINIT_SVC_H__
+#ifndef FINIT_SVC_H_
+#define FINIT_SVC_H_
 
-#include "service.h"
+#include <errno.h>
+#include <sys/shm.h>		/* shmat() */
+#include <sys/types.h>		/* pid_t */
 
-svc_t *svc_new_service  (void);
-svc_t *svc_find_by_id   (int id);
-svc_t *svc_find_by_name (char *name);
-svc_t *svc_iterator     (int restart);
+#include "finit.h"
 
-#endif	/* FINIT_SVC_H__ */
+typedef enum {
+	SVC_STOP = 0,		/* Disabled */
+	SVC_START,		/* Enabled */
+	SVC_RELOAD		/* Enabled, needs restart */
+} svc_cmd_t;
+
+#define FINIT_SHM_ID     0x494E4954  /* "INIT", see ascii(7) */
+#define MAX_ARG_LEN      64
+#define MAX_STR_LEN      64
+#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 <stop|start|restart> service */
+typedef struct svc {
+	/* Private */
+	int            id;	/* Service ID#, set by svc_new() */
+	pid_t	       pid;
+	char	       cmd[MAX_ARG_LEN];
+	char	       args[MAX_NUM_SVC_ARGS][MAX_ARG_LEN];
+	char	       descr[MAX_STR_LEN];
+	/* Public */
+	int	       delayed_reload; /* For external service plugin. */
+	plugin_svc_t  *plugin;
+} svc_t;
+
+typedef struct svc_map svc_map_t;
+
+/* Put services array in shm */
+static inline svc_t *finit_svc_connect(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;
+}
+
+static inline int svc_id(svc_t *svc)
+{
+	if (!svc) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	return svc->id;
+}
+
+svc_t    *svc_new           (void);
+svc_t    *svc_find_by_id    (int id);
+svc_t    *svc_find_by_name  (char *name);
+svc_t    *svc_iterator      (int restart);
+
+int       svc_register      (char *line);
+int       svc_id_by_name    (char *name);
+svc_cmd_t svc_enabled	    (svc_t *svc, int dynamic);
+int       svc_start         (svc_t *svc);
+int       svc_start_by_name (char *name);
+int       svc_stop          (svc_t *svc);
+int       svc_reload        (svc_t *svc);
+void      svc_start_all     (void);
+
+#endif	/* FINIT_SVC_H_ */
 
 /**
  * Local Variables: