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== linux 进程管理api ==
 * fork 创建新进程
 * exec* 用一个新的程序代替当前运行的进程
 * wait 等待子进程结束

== 内存管理 ==
 * [[https://en.wikipedia.org/wiki/Sbrk|sbrk]]:sbrk是一个Unix系统调用,用来改变进程数据段的大小,是很多内存分配程序(malloc)的基础之一(另一个是mmap)

 * [[https://en.wikipedia.org/wiki/Unikernel|Unikernel]] a library OS
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