+List of Changes to UUCP
+CHANGES 5.1 83/07/02
+This is a list of changes made to the base version of uucp.
+An attempt is made to justify the changes made.
+This list may be useful to those implementing yet better versions.
+ Tom Truscott
+
+anlwrk.c: lots of changes. See the comments at the top.
+ Main efficiency improvement: eliminate stat(II)s.
+ Main bug fix: avoid sending files to wrong system.
+
+Uses Berkeley 4.2bsd directory reading subroutines.
+ Useful if someone wants to run this uucp under 4.2bsd.
+
+Added uucp subdirectories. See 'README' or 'INSTALL' for details.
+ Subdirectories are enabled by #define-ing UUDIR in uucp.h.
+ No more assembler code needed.
+ grep UUDIR *.[hc] to see how it is implemented.
+
+Times of form 'hh:mm' are uniformly printf-ed with "%d:%02d".
+ The %02d guarantees a 2 digit number w/ leading zero if needed.
+
+uucp work files (e.g. spool files) are created with umask==WFMASK (uucp.h).
+WFMASK can disable reading by 'others'. In fact that is the default,
+which might be annoying, but you can change it.
+LOG files (LOGFILE, SYSLOG, ERRLOG) are created with umask=LOGMASK (uucp.h),
+which as distributed permits general read access to avoid loud user screams.
+User files are created with mode (not umask!) at least BASEMODE (uucp.h)
+and possibly with more permissions if the user so specified.
+To avoid loud user screams, BASEMODE should probably be 666
+since uucp-created files are owned by uucp.
+
+chkpth.c: uses dynamic allocation due to Doug Kingston.
+ chkpth() and chkperm() are no longer called for vanilla
+ Spool area requests, so they can be made 'tougher'.
+ These routines, and how they are used, is a bleak area
+ of uucp that should be scrapped and redone coherently.
+
+#define for SYSIII added. The idea is to have code that runs
+on SYSIII etc. as well as v7, 32V, 4.1bsd, etc.
+However it has never been tested and surely won't work.
+
+cntrl.c: lots off changes here. Mostly performance enhancements.
+ Bypasses chkpth/chkperm/anyread checks for vanilla spool files.
+ No longer logs 'COPY SUCCEEDED' in LOGFILE, only failures.
+ (Still logs request data. And SYSLOG still logs file transfers.)
+ Has 'PATIENCE' when shipping huge files (this partially works,
+ the huge file gets over okay, and is signed off, but the
+ next attempted transfer fails. Not catastrophic, but not nice.)
+ Cranks up a uuxqt each time ten 'X' files have gone past
+ (to avoid collecting 100+ X files before uuxqt starts!)
+ ultouch() is called only rarely. A missing chmod after an 'xmv'
+ has been added. Due to the extra diligence in chkperm, etc.
+ the old 'put files in /usr/spool/uucppublic' may no longer
+ work "right". Sorry, but I am not sure how it is supposed to work.
+ I will look into this someday, sooner if it is an actual problem.
+
+vectors/buffers for L.sys lines increased in versys.c and conn.c
+to permit 1000 char lines and 100 'fields' on a line.
+
+conn.c: obscure changes here, mostly in the send/expect sequence.
+ File descriptor prediction implemented (not tested!),
+ extremely obscure problem apparently first noted by Steve Bellovin.
+ Default end of 'send' string is \r, not \n.
+ PAUSE5 pauses 5 seconds. \d pauses 1 second (\d\d\d\d\d pauses 5).
+ foo\c sends 'foo' with no ending \r. \05 sends control-e.
+ \s sends a space (so does \40). CR sends a \r, LF sends \n.
+ "" sends a \r. Output is in even parity, changable with send strings
+ P_ZERO, P_EVEN, P_ODD, P_ONE. BREAK sends a break (or simulates one).
+ And expect string of "" expects nothing, just returns, so
+ to send an initial \r one can just do
+ "" "" ogin:--ogin:
+ to poke the remote site into sending a login message.
+ Send strings are only printed in debug if uid <= PRIV_UIDS (uucp.h).
+
+ Alan Watt's date changes were in decvax, but should mentioned here.
+ Except I am not sure how they work. Look near the end of conn.c.
+
+expfile() returns 0 if the expanded file is a vanilla spool file.
+ That way chkpth/chkperm can be bypassed, and those routines
+ can have several huge loopholes removed.
+
+gename.c has Alan Watt's (a) base 62 sequence numbering and (b)
+ greatly reduced locking rate.
+ The comments at the top describe it fairly well.
+ It looks awful, but just use it. It works.
+
+gio.c: ultouch() is called occasionally (kludge!)
+ IO errors are checked for.
+gnsys.c calls each system only once in a uucico session.
+ Also, calls callok() only once for each system.
+ I forget how that works.
+
+imsg.c: strips parity bits, in case the incoming chars have some.
+
+logent.c: greatly simplified! Justs opens LOGFILE for append
+ and then seeks to end and writes each new entry.
+ Can cause scrambling on systems w/o guaranteed append-to-end,
+ but is too good a speedup to pass up.
+
+pk.c: check-summing is done correctly on machines which do not
+ sign-extend characters. Time-outs made more generous.
+
+lint: The code has been de-linted as best I could.
+ uucp.h contains lots of declarations of functions which
+ return non-int, like strcpy(), etc.
+
+uucplock.c:
+ ultouch() changed to be done only occasionally.
+ Only changes st_ctime, not atime or mtime,
+ so programs can be written to display time spent locked.
+
+uucp: uucp x foo!y causes a uucico to call only system foo,
+ not a uucico to try to call everyone with spooled work.
+
+uucp.h: unused #defines have been removed.
+
+uulog.c: greatly simplied, since logent.c is greatly simplied.
+ Only used in forms 'uulog -u user' and 'uulog -s system'.
+ Also, 'uulog -uuser' and 'uulog -ssystem' are permitted.
+ And both options may be specifed. None is an error.
+
+uux: -g<g> option added to specify priority grade.
+ -c option does not copy. -l is a synonym.
+ 'X' files use local system name to avoid possible name conflict.
+ uucico cranked up calls only target system, not everyone.
+
+uuxqt: reads commands from /usr/lib/uucp/L.cmds.
+ A line of form 'PATH=...' changes the command search path.
+
+uucpname.c: A real kludge went here.
+ On some UNIX systems, a program's set-user-id bit is ignored
+ if the invoker is root. But then uucp would create files
+ owned by root, and if not generally writable uucp
+ would later be unable to write on them (e.g. LOGFILE).
+ So uucpname, since it is called at the start of
+ every relevant uucp program, checks for getuid()==geteuid()==0
+ in which case it changes its uid/gid to that of the owner of
+ the file /usr/lib/uucp/uucico.
+
+Debugging mode is permitted only to invokers with uid <= PRIV_UIDS.
+
+dialout.c routine has dialend() routine which is called to hang up.
+Tue Mar 29 16:25:01 EST 1983
+
+Makefile: GROUP variable added so file OWNER and GROUP are both set correctly.
+uuxqt/uucico/uuclean are no longer executable by 'others'.
+
+uucp.h: PRIV_UIDS reduced to 3 to reduce security danger.
+
+cico.c: cleanup() ioctl(II)s changed to avoid hang-up on Gould/SEL machine.
+
+anlwrk.c: Infinite loop check was buggy, causing occasional,
+sometimes persistent, 'NO WORK' messages. Simpler method now used.
+
+conn.c: dialout() argument format changed to support variant dialers.
+Also, #defines added to support different UNIX-es understanding
+of different baud rates.
+
+Compatibility mods:
+#include <ascii.h> in dialout.c now deleted. ncsu!mcm
+ (Mike Mitchell)
+
+System V compatibility mods. burl!lda, Larry Auton
+PATH=... in Makefile changed to APATH=... .
+
+FIOCLEX added to prevent ACU/communication files being inherited by children.
+
+Files cleaned up (register variables added) by Mike Mitchell (ncsu!mcm).
+
+u[bs]_sst.c, us_rrs.c: "a+" fopen mode changed to "r+". NOTE:
+ uusub, uustat are not claimed to work in this version.
+ Further, "r+" does not work in 4.1bsd or 32V.
+
+cntrl.c calls wait(II) after uuxqt()s are started, to avoid
+filling the proc table with zombies.
+
+uuxqt now sorts "X" files to keep execution in order.
+
+setline.c: fixes for 'system III' sites. NOT TESTED.
+
+gwd.c: The pwd(I) is run with effective uid reverted to the real uid.
+
+logent also prints to stderr if debugging is on
+
+UNET channel added. Still running slowly, though.
+
+Changed XQTDIR from /usr/lib/uucp/.XQTDIR to /usr/spool/uucp/XTMP.
+
+Add gethostname().
+
+Add SYSFILECR.
+
+sysexits.h added
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