Google开发的自定义的c/c++库Bionic，主要用于移动设备嵌入式环境。gbu的库太大了不适合在嵌入式环境使用。学习c库函数的实现有助于更快的学会c语言。-Google developed custom c/c++ library Bionic, mainly used in mobile devices embedded environments. gbu library too is not suitable for use in an embedded environment.