New system calls: pidfd_open() and close_range()

The linux-kernel mailing list has recently seen more than the usual amount of traffic proposing new system calls. LWN is endeavoring to catch up with that stream, starting with a couple of proposals for the management of file descriptors. pidfd_open() is a new way to create a "pidfd" file descriptor that refers to a process in the system, while close_range() is an efficient way to close many open descriptors with a single call.

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