What do the individual flags mean and do in clone()?

The clone() system call has several flags that will indicate how much will be shared between threads. Below you will find a table listing each flag, its function & its implementation status.

Flag	Status	Description
CLONE_VM	Done	Share data and stack
CLONE_FS	Done	Share filesystem info
CLONE_FILES	Done	Share open files
CLONE_SIGHAND	Done	Share signals
CLONE_PID	Almost Done	Share PID with parent (problems with /proc and signals go to parent)

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