Initial support for building Finit statically (incomplete)

This patch adresses issue #5.  However, there still remains a few issues
to work around before Finit can be built completely standalone.

    $ make clean all STATIC=1
    LINK    finit
    helpers.o: In function `getgroup':
    helpers.c:(.text+0x10a7): warning: Using 'getgrnam' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
    helpers.o: In function `getuser':
    helpers.c:(.text+0x108e): warning: Using 'getpwnam' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
    inetd.o: In function `getent':
    inetd.c:(.text+0x127): warning: Using 'getprotobyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
    inetd.c:(.text+0xce): warning: Using 'getservbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking

The problem is the NSS plugins and similar issues that prevent static
linking when using the above functions.  See issue #5 for more on this.

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

plugin.c

@@ -39,7 +39,9 @@
 static char *plugpath = NULL; /* Set by first load. */
 static TAILQ_HEAD(plugin_head, plugin) plugins  = TAILQ_HEAD_INITIALIZER(plugins);
 
+#ifndef PLUGINS_STATIC
 static void check_plugin_depends(plugin_t *plugin);
+#endif
 
 int plugin_register(plugin_t *plugin)
 {
@@ -50,12 +52,16 @@ int plugin_register(plugin_t *plugin)
 
 	/* Setup default name if none is provided */
 	if (!plugin->name) {
+#ifndef PLUGINS_STATIC
 		Dl_info info;
 
 		if (!dladdr(plugin, &info) || !info.dli_fname)
 			plugin->name = "unknown";
 		else
 			plugin->name = (char *)info.dli_fname;
+#else
+			plugin->name = "unknown";
+#endif
 	}
 
 	/* Already registered? */
@@ -64,8 +70,10 @@ int plugin_register(plugin_t *plugin)
 		return 0;
 	}
 
+#ifndef PLUGINS_STATIC
 	/* Resolve plugin dependencies */
 	check_plugin_depends(plugin);
+#endif
 
 	TAILQ_INSERT_TAIL(&plugins, plugin, link);
 
@@ -75,6 +83,7 @@ int plugin_register(plugin_t *plugin)
 /* Not called, at the moment plugins cannot be unloaded. */
 int plugin_unregister(plugin_t *plugin)
 {
+#ifndef PLUGINS_STATIC
 	TAILQ_REMOVE(&plugins, plugin, link);
 
 	if (plugin->svc.cb) {
@@ -92,6 +101,9 @@ int plugin_unregister(plugin_t *plugin)
 		_e("Failed unloading %s ...", plugin->name);
 		return 1;
 	}
+#else
+	_d("Finit built statically, cannot unload %s ...", plugin->name);
+#endif
 
 	return 0;
 }
@@ -191,7 +203,7 @@ static void init_plugins(uev_ctx_t *ctx)
 	}
 }
 
-
+#ifndef PLUGINS_STATIC
 /**
  * load_one - Load one plugin
  * @path: Path to finit plugins, usually %PLUGIN_PATH
@@ -270,10 +282,12 @@ static void check_plugin_depends(plugin_t *plugin)
 		load_one(plugpath, plugin->depends[i]);
 	}
 }
+#endif	/* PLUGINS_STATIC */
 
 int plugin_load_all(uev_ctx_t *ctx, char *path)
 {
 	int fail = 0;
+#ifndef PLUGINS_STATIC
 	DIR *dp = opendir(path);
 	struct dirent *entry;
 
@@ -295,6 +309,11 @@ int plugin_load_all(uev_ctx_t *ctx, char *path)
 	}
 
 	closedir(dp);
+#else
+	_d("Finit built statically, not loading plugins from %s ...", path);
+#endif	/* PLUGINS_STATIC */
+
+	/* Always initialize plugins */
 	init_plugins(ctx);
 
 	return fail;