[PATCH v1 1/2] open: add close_range()

[David Laight]

From:  Konstantin Khlebnikov
> Sent: 23 May 2019 17:22
....
>  > In addition, the syscall will also work for tasks that do not have procfs
>  > mounted and on kernels that do not have procfs support compiled in. In such
>  > situations the only way to make sure that all file descriptors are closed
>  > is to call close() on each file descriptor up to UINT_MAX or RLIMIT_NOFILE,
>  > OPEN_MAX trickery (cf. comment [8] on Rust).

Code using RLIMIT_NOFILE is broken.
It is easy to reduce the hard limit below that of an open fd.

	David

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