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usr.bin/tar/ ignores error codes from read() just silently pads nulls

Hi &
usr.bin/tar ignores device error codes from read() & silently pads nulls.  See
  FreeBSD 6.2 6.4 7.3, 8.0, 8.1, & current src/usr.bin/tar/write.c
  NetBSD 5.1 & current src/external/bsd/libarchive/dist/tar/write.c
        last 3 lines ... bytes_read = read

I filed a send-pr yesterday Mon, 31 Jan 2011 04:52:29 +0100 (CET)
diffs slightly cleaned up here:
Tar author will probably issue cleaner code as soon as he has time.

Meantime, if you may have copied in data without realising media was flakey,
bsdtar will not have warned (though /var/log/messages does), so
you may want to scan with find & a detector eg

Julian Stacey, BSD Unix Linux C Sys Eng Consultants Munich
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