Return with an error from copy_link(), copy_fifo() and copy_special() if
the -n option is specified and the destination file exists.

PR:		bin/174489
Approved by:	rstone (co-mentor)
MFC after:	2 weeks
When the 'R' flag is used with a newsyslog.conf entry, some fields of
the corresponding struct sigwork_entry were left uninitialized,
potentially causing an early return from do_sigwork(). Ensure that these
fields are initialized, and handle the 'R' flag properly in
do_sigwork().

PR:		bin/175330
Reviewed by:	gad
Approved by:	rstone (co-mentor)
MFC after:	1 week
Ensure that newsyslog -n prints the correct message for a rotation rule
that uses the 'R' flag.

Reviewed by:	gad
Approved by:	rstone (co-mentor)
MFC after:	1 week
Rename the run_cmd field to sw_runcmd to make it consistent with the
other fields in struct sigwork_entry.

Approved by:	rstone (co-mentor)
MFC after:	1 week
Fix reversed condition in the logic to wait for the chipset buffers
flush wait on the Gen2 chipsets.  Confirmed by the inspection of the
Linux agp code.

Submitted by:	Taku YAMAMOTO <taku@tackymt.homeip.net>
MFC after:	2 weeks
Be conservative and do not try to consume more bytes than was
requested from the server for the read operation.  Server shall not
reply with too large size, but client should be resilent too.

Reviewed by:	rmacklem
MFC after:	1 week
Properly quote argument.

MFC after:	3 days