Linux Threads Home Page: What do the individual flags mean and do in clone()?

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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