(2) implement suggestion made by Garrett Wollman of "sendmail flags"
to set flags passed to sendmail and/or turn it off
(3) document origins of variables
fixed bug where large amounts of unidirectional UDP traffic would fill
the interface output queue and further udp packets would be fragmented
and only partially sent - keeping the output queue full and jamming the
network, but not actually getting any real work done (because you can't
send just 'part' of a udp packet - if you fragment it, you must send
the whole thing). The fix involves adding a check to make sure that the
output queue has sufficient space for all of the fragments.
sosend was attempting to reserve space in an mbuf cluster for a datagram
header and because of bugs in the sosend's mbuf allocation algorithm,
sosend was calling uiomove twice as many times as was necessary. It turns
out that PREPEND does the right thing when a cluster is associated with
an mbuf header, so the datagram header allocation can be defered. This
also ends up additionally consuming one less mbuf for the TCP protocol
because TCP always allocates another header mbuf regardless if space is
available to prepend the protocol header. The net result of this fix is
that unix domain and pipe throughput is increased by a measured 10%.
* Escape characters in the string needed to be processed as they were
encountered, otherwise a "\000" octal constant would prematurely
terminate the formatting string.
* Implemented the %b, SysV echo(1) compatibility, formatting directive.
I found an error in the table. The same error is found in the SUNOS
4.1.1 version of bcd. It has apparently been around a long time.
The error caused 'Q' and 'R' to have the same punch code. I only
noticed the error due to someone pointing t out to me when the
program was used to print a cover for an APA!
to call pppstart or not: now we call pppstart for every packet,
which should aid recovery from lost transmitter interrupts.
Also a fix for 386BSD/FreeBSD which doesn't affect NetBSD.
