On Fri, Sep 11, 2020 at 3:52 PM Rick Macklem <rmack...@uoguelph.ca> wrote:
> Konstantin Belousov wrote: > >On Fri, Sep 11, 2020 at 08:49:36PM +0000, Alan Somers wrote: > >> Author: asomers > >> Date: Fri Sep 11 20:49:36 2020 > >> New Revision: 365643 > >> URL: https://svnweb.freebsd.org/changeset/base/365643 > >> > >> Log: > >> cp: fall back to read/write if copy_file_range fails > >> > >> Even though copy_file_range has a file-system agnostic version, it > still > >> fails on devfs (perhaps because the file descriptor is non-seekable?) > In > >> that case, fallback to old-fashioned read/write. Fixes > >> "cp /dev/null /tmp/null" > > > >Devices are seekable. > > > >The reason for EINVAL is that vn_copy_file_range() checks that both in > and out > >vnodes are VREG. For devfs, they are VCHR. > > I coded the syscall to the Linux man page, which states that EINVAL is > returned > if either fd does not refer to a regular file. > Having said that, I do not recall testing the VCHR case under Linux. (ie. > It might > actually work and the man page turns out to be incorrect?) > > I will test this case under Linux when I get home next week, rick > Since there's no standard, I think it's fine for us to support devfs if possible. _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
