# Functions
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IsProcessAlive 如果带有给定pid的进程正在运行，则返回true.
IsProcessZombie 如果进程的状态为"Z"则返回true http://man7.org/linux/man-pages/man5/proc.5.html.
KillProcess 强制停止进程.
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MkdirAllWithACL 是os的包装器。MkdirAll在unix系统。.
Umask 设置当前进程的文件模式创建掩码为newmask并返回oldmask.
# Variables
ErrNotSupportedOperatingSystem means the operating system is not supported.
ErrNotSupportedPlatform means the platform is not supported.