svn commit: r359836 - in head: include lib/libc/sys sys/compat/freebsd32 sys/kern sys/sys tests/sys/file

[Cy Schubert]

In message <202004122123.03CLNK82073001 at repo.freebsd.org>, Kyle Evans 
writes:
> Author: kevans
> Date: Sun Apr 12 21:23:19 2020
> New Revision: 359836
> URL: https://svnweb.freebsd.org/changeset/base/359836
>
> Log:
>   Implement a close_range(2) syscall
>   
>   close_range(min, max, flags) allows for a range of descriptors to be
>   closed. The Python folk have indicated that they would much prefer this
>   interface to closefrom(2), as the case may be that they/someone have specia
> l
>   fds dup'd to higher in the range and they can't necessarily closefrom(min)
>   because they don't want to hit the upper range, but relocating them to lowe
> r
>   isn't necessarily feasible.
>   
>   sys_closefrom has been rewritten to use kern_close_range() using ~0U to
>   indicate closing to the end of the range. This was chosen rather than
>   requiring callers of kern_close_range() to hold FILEDESC_SLOCK across the
>   call to kern_close_range for simplicity.
>   
>   The flags argument of close_range(2) is currently unused, so any flags set
>   is currently EINVAL. It was added to the interface in Linux so that future
>   flags could be added for, e.g., "halt on first error" and things of this
>   nature.
>   
>   This patch is based on a syscall of the same design that is expected to be
>   merged into Linux.
>   
>   Reviewed by:	kib, markj, vangyzen (all slightly earlier revisions)
>   Differential Revision:	https://reviews.freebsd.org/D21627
>
> Modified:
>   head/include/unistd.h
>   head/lib/libc/sys/Makefile.inc
>   head/lib/libc/sys/Symbol.map
>   head/lib/libc/sys/closefrom.2
>   head/sys/compat/freebsd32/syscalls.master
>   head/sys/kern/capabilities.conf
>   head/sys/kern/kern_descrip.c
>   head/sys/kern/syscalls.master
>   head/sys/sys/syscallsubr.h
>   head/tests/sys/file/closefrom_test.c

A __FreeBSD_version bump should be for ports to test for.


-- 
Cheers,
Cy Schubert <Cy.Schubert at cschubert.com>
FreeBSD UNIX:  <cy at FreeBSD.org>   Web:  http://www.FreeBSD.org

	The need of the many outweighs the greed of the few.