initial import: starts and connects to ubus

.gitignore

@@ -0,0 +1,8 @@
+procd
+.*
+Makefile
+CMakeCache.txt
+CMakeFiles
+*.cmake
+install_manifest.txt
+

CMakeLists.txt

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+cmake_minimum_required(VERSION 2.6)
+
+PROJECT(procd C)
+ADD_DEFINITIONS(-Os -Wall -Werror --std=gnu99 -Wmissing-declarations)
+
+SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "")
+
+IF(APPLE)
+  INCLUDE_DIRECTORIES(/opt/local/include)
+  LINK_DIRECTORIES(/opt/local/lib)
+ENDIF()
+
+SET(SOURCES main.c ubus.c)
+
+SET(LIBS ubox ubus)
+
+IF(DEBUG)
+  ADD_DEFINITIONS(-DDEBUG -g3)
+ENDIF()
+
+ADD_EXECUTABLE(procd ${SOURCES})
+
+TARGET_LINK_LIBRARIES(procd ${LIBS})
+
+INSTALL(TARGETS procd
+	RUNTIME DESTINATION sbin
+)

main.c

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+#include <getopt.h>
+#include "procd.h"
+
+int debug = 0;
+
+static int usage(const char *prog)
+{
+	fprintf(stderr, "Usage: %s [options]\n"
+		"Options:\n"
+		"    -s <path>:		Path to ubus socket\n"
+		"    -d:		Enable debug messages\n"
+		"\n", prog);
+	return 1;
+}
+
+int main(int argc, char **argv)
+{
+	int ch;
+
+	while ((ch = getopt(argc, argv, "ds:")) != -1) {
+		switch (ch) {
+		case 's':
+			ubus_socket = optarg;
+			break;
+		case 'd':
+			debug++;
+			break;
+		default:
+			return usage(argv[0]);
+		}
+	}
+	uloop_init();
+	procd_connect_ubus();
+	uloop_run();
+
+	return 0;
+}

procd.h

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+#ifndef __PROCD_H
+#define __PROCD_H
+
+#include <libubox/uloop.h>
+#include <stdio.h>
+
+#define DPRINTF(fmt, ...) do { \
+	if (debug) \
+		fprintf(stderr, "DEBUG %s(%d): " fmt, __func__, __LINE__, ## __VA_ARGS__); \
+	} while (0)
+
+extern int debug;
+extern char *ubus_socket;
+void procd_connect_ubus(void);
+
+#endif

service.h

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+#include <libubox/avl.h>
+#include <libubox/vlist.h>
+
+struct service {
+	struct avl_node avl;
+	const char *name;
+
+	struct vlist_tree instances;
+};
+
+struct service_instance {
+	struct vlist_node node;
+	const char *name;
+
+	struct blob_attr *config;
+	struct uloop_process proc;
+};
+
+

ubus.c

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+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include <libubus.h>
+
+#include "procd.h"
+
+char *ubus_socket = NULL;
+static struct ubus_context *ctx;
+static struct uloop_process ubus_proc;
+static bool ubus_connected = false;
+
+static void procd_ubus_connection_lost(struct ubus_context *old_ctx);
+
+static void ubus_proc_cb(struct uloop_process *proc, int ret)
+{
+	/* nothing to do here */
+}
+
+static void procd_restart_ubus(void)
+{
+	char *argv[] = { "ubusd", NULL, ubus_socket, NULL };
+
+	if (ubus_proc.pending) {
+		DPRINTF("Killing existing ubus instance, pid=%d\n", (int) ubus_proc.pid);
+		kill(ubus_proc.pid, SIGKILL);
+		uloop_process_delete(&ubus_proc);
+	}
+
+	if (ubus_socket)
+		argv[1] = "-s";
+
+	ubus_proc.pid = fork();
+	if (!ubus_proc.pid) {
+		execvp(argv[0], argv);
+		exit(-1);
+	}
+
+	if (ubus_proc.pid <= 0) {
+		DPRINTF("Failed to start new ubus instance\n");
+		return;
+	}
+
+	DPRINTF("Launched new ubus instance, pid=%d\n", (int) ubus_proc.pid);
+	uloop_process_add(&ubus_proc);
+}
+
+static void procd_ubus_try_connect(void)
+{
+	if (ctx) {
+		ubus_connected = !ubus_reconnect(ctx, ubus_socket);
+		return;
+	}
+
+	ctx = ubus_connect(ubus_socket);
+	if (!ctx) {
+		DPRINTF("Connection to ubus failed\n");
+		return;
+	}
+
+	ctx->connection_lost = procd_ubus_connection_lost;
+	ubus_connected = true;
+}
+
+static void procd_ubus_connection_lost(struct ubus_context *old_ctx)
+{
+	procd_ubus_try_connect();
+	while (!ubus_connected) {
+		procd_restart_ubus();
+		sleep(1);
+		procd_ubus_try_connect();
+	}
+
+	DPRINTF("Connected to ubus, id=%08x\n", ctx->local_id);
+	ubus_add_uloop(ctx);
+}
+
+void procd_connect_ubus(void)
+{
+	ubus_proc.cb = ubus_proc_cb;
+	procd_ubus_connection_lost(NULL);
+}
+