دوست عزیز xnu قسمتی از داروین هست که به صورت رایگان و کاملا متن باز ارایه میشه
https://opensource.apple.com/source/xnu/
XNU - Wikipedia, the free encyclopedia
XNU is the kernel that Apple Inc. acquired and developed for use in the OS X and iOS operating systems and released as free and open source software as part of the Darwin operating system. XNU is an acronym for X is Not Unix.[5]






پاسخ با نقل قول