libubox
是openwrt
新版本中的一个基础库,有很多应用是基于libubox
开发的,如uhttpd
,odhcpd
,libubus
等。
libubox
主要提供以下两种功能:
提供一套基于事件驱动的机制;
提供多种开发支持接口,如链表、
kv
链表、平衡查找二叉树、md5
、json
等。
使用libubox
开发的好处有如下几点:
可以使程序基于事件驱动,从而可实现在单线程中处理多个任务;
基于
libubox
提供的API
可以加快开发进度,提高程序的稳定性;能更好的将程序融入
openwrt
架构中,因为新的openwrt
的很多应用和库都基于libubox
开发。
libubox
库依赖json-c
库,所以需要先安装:
$ git clone https://github.com/json-c/json-c.git $ cd json-c/ $ ./autogen.sh $ ./configure --prefix=xxx $ make $ make install
下载libubox
代码:
$ git clone http://git.openwrt.org/project/libubox.git $ cd libubox
修改CMakeLists.txt
:
cmake_minimum_required(VERSION 2.6) INCLUDE(CheckLibraryExists) INCLUDE(CheckFunctionExists) ADD_DEFINITIONS(-DJSONC) INCLUDE_DIRECTORIES("xxx/json-c/include/json-c") INCLUDE_DIRECTORIES("xxx/json-c/include") LINK_DIRECTORIES("xxx/json-c/lib") SET(CMAKE_INSTALL_PREFIX "xxx/libubox") PROJECT(ubox C) ADD_DEFINITIONS(-Os -Wall -Werror --std=gnu99 -g3 -Wmissing-declarations) OPTION(BUILD_LUA "build Lua plugin" ON) OPTION(BUILD_EXAMPLES "build examples" ON) INCLUDE(FindPkgConfig) PKG_SEARCH_MODULE(JSONC json-c) IF(JSONC_FOUND) ADD_DEFINITIONS(-DJSONC) INCLUDE_DIRECTORIES(${JSONC_INCLUDE_DIRS}) ENDIF() SET(SOURCES avl.c avl-cmp.c blob.c blobmsg.c uloop.c usock.c ustream.c ustream-fd.c vlist.c utils.c safe_list.c runqueue.c md5.c kvlist.c ulog.c base64.c) ADD_LIBRARY(ubox SHARED ${SOURCES}) ADD_LIBRARY(ubox-static STATIC ${SOURCES}) SET_TARGET_PROPERTIES(ubox-static PROPERTIES OUTPUT_NAME ubox) SET(LIBS) CHECK_FUNCTION_EXISTS(clock_gettime HAVE_GETTIME) IF(NOT HAVE_GETTIME) CHECK_LIBRARY_EXISTS(rt clock_gettime "" NEED_GETTIME) IF(NEED_GETTIME) TARGET_LINK_LIBRARIES(ubox rt) ENDIF() ENDIF() FILE(GLOB headers *.h) INSTALL(FILES ${headers} DESTINATION include/libubox ) INSTALL(TARGETS ubox ubox-static ARCHIVE DESTINATION lib LIBRARY DESTINATION lib ) #ADD_SUBDIRECTORY(lua) #ADD_SUBDIRECTORY(examples) find_library(json NAMES json-c) IF(EXISTS ${json}) #ADD_LIBRARY(blobmsg_json SHARED blobmsg_json.c) #TARGET_LINK_LIBRARIES(blobmsg_json ubox ${json}) ADD_LIBRARY(blobmsg_json-static STATIC blobmsg_json.c) SET_TARGET_PROPERTIES(blobmsg_json-static PROPERTIES OUTPUT_NAME blobmsg_json) #ADD_EXECUTABLE(jshn jshn.c) #TARGET_LINK_LIBRARIES(jshn blobmsg_json ${json}) ADD_LIBRARY(json_script SHARED json_script.c) TARGET_LINK_LIBRARIES(json_script ubox) INSTALL(TARGETS blobmsg_json-static json_script ARCHIVE DESTINATION lib LIBRARY DESTINATION lib RUNTIME DESTINATION bin ) #INSTALL(TARGETS blobmsg_json blobmsg_json-static jshn json_script # ARCHIVE DESTINATION lib # LIBRARY DESTINATION lib # RUNTIME DESTINATION bin #) FILE(GLOB scripts sh/*.sh) INSTALL(FILES ${scripts} DESTINATION share/libubox ) ENDIF()
编译:
$ mkdir cmake-build $ cd cmake-build/ $ cmake ../ $ make $ make install
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