source: trunk/third/top/Changes @ 16185

Thu Mar 30 2000 - wnl (3.5beta12)
        Updated modules: m_aix41.c, m_aix43.c, m_mtxinu.c, m_sco5.c,
        and m_ultrix4.c.
        Included m_irixsgi.c from some source that's been floating around
        SGI.  Don't yet know how it compares to m_irix62.

Fri Mar 10 2000 - wnl (3.5beta11)
        top.c: avoid potential loop if stdout gets closed, use macro
        for p_active to avoid collision with system macros.
        m_sunos5: widened some fields to accomodate 5.8.
        m_decosf1: added ordering support
        m_irix62_64: provides 64-bit module based on m_irix62.
        m_irix62: skip bogus files in /proc directory
        m_svr42MP and m_svr5: complete replacement with updated copies
        m_mtxinu: complete replacement with updated copies
        m_aix43: new module for 4.3
        getans: replaced with a Bourne shell script

Mon Mar  6 2000 - wnl (3.5beta10)
        m_sunos5.c: workaround for curses bug: ensure that TERMINFO has
        a value.

Fri Jan 15 1999 - wnl (3.5beta10)
        top.c: now check return code from read to avoid looping on eof.
        top.c: delay of 0 now only valid for root.
        decosf1.c: patches from Rainer Orth should fix most of the
        problems with this module (including the display of certain
        processes and runtime errors).
        sunos5.c: Rainer insisted on putting the slash back in the
        state field ("run/4") and widened the field to accomodate it.
        aix.c: widened PID field for 6-digit pids (shortened NICE field)
        module macosx added, thanks to Andrew Townley.

Fri Dec 18 1998 - wnl (3.5beta9)
        Configure checks status of "make" and complains if it fails.

Thu Dec 17 1998 - wnl (3.5beta9)
        Added module sco5 from Mike Hopkirk.
        Added module netbsd132 from moto kawasaki.

Sun Oct 25 1998 - wnl (3.5beta9)
        Added Casper's patches for sunos5 for the following:
        produce same results as swap -s (5.5 and higher),
        don't use system_pages kstat when /dev/kmem can be opened,
        skip . and .. when reading /proc, replace use of SOLARIS24
        with OSREV.

Fri Sep 11 1998 - wnl (3.5beta9)
        Added workaround to getans for the absence of $< in SCO Unix.

Wed Jul  1 1998 - wnl (3.5beta9)
        Changed structure member "errno" to "errnum" in commands.c.
        Replaced hpux10 module with one from John Haxby.

Fri Apr 17 1998 - wnl (3.5beta8)
        Moved definition of _KMEMUSER earlier in m_sunos5.c.  This should
        fix the compilation problem with gnu 2.7.2.3, obviating the need
        for the fixinc.svr4 patch, but hopefully will not affect anything
        else.
        Added -DORDER to m_sunos4mp.c

Tue Nov 18 1997 - wnl (3.5beta7)
        Added gcc 2.7.2.3 patch for fixinc.svr4 and changed INSTALL and
        FAQ to refer to it.
        Added NetBSD HP9000 fix.  Hopefully it doesn't break other 
        NetBSD platforms.

Fri Oct 24 1997 - wnl (3.5beta7)
        Modified m_dcosx.c to change uses of procdir to xprocdir, avoiding
        a name clash with an include file (Bryn Parrott)

Sat Oct 11 1997 - wnl (3.5beta6)
        Incorporated Casper's patches for Solaris 2.6 and for the multi-
        processor bug ("kstat finds too many cpus").

Sun Jan 20 1996 - wnl (3.5beta5)
        Fixed Casper's m_sunos5 module: there was a poor interaction with 
        his use of OSREV and SunOS 5.5.1.

Fri Dec 20 1996 - wnl (3.5beta4)
        Replaced m_sunos5 with a reworked version by Casper Dik.  This one
        should work under 2.6 and may not require that top be run setuid
        to root under 2.5 or 2.6.  This also fixed a bug in m_sunos5 that
        was introduced in beta3.
        Fixed calculation of OSREV in Configure.

Wed Nov 20 1996 - wnl (3.5beta3)
        Incorporated contributed fixes to:  bsdos2, irix62, freebsd20,
        ultrix4, sunos5.  Changed calculation of swap area in sunos5 (now
        uses swapctl).  sunos5 now understands idled processors.  Changed
        Configure to determine os revision using uname (when available)
        and adding it to machine.c compiliation in Makefile as -DOSREV.
        Changed calls to "exit" in modules to use "quit" instead.

Oct 20 1996 - wnl (3.5beta3)
        Removed "time" from list of ordering choices:  there's no easy way
        to get cpu time for all processes (it's in the u area).

Fri Oct 18 1996 - wnl (3.5beta3)
        hpux10 and hpux9: using a better means for determining when a
        process is idle.
        decosf1 now includes utils.h.

Fri Sep 13 1996 - wnl (3.5beta2)
        Fixed Configure to build Make.desc in such a way that doesn't
        require a long argument to sed.

Thu Sep 12 1996 - wnl (3.5beta2)
        Fixed bug in display.c that affected empty cpustate names.
        Created hpux1010 module - a variant of hpux10 that does not use
        struct proc or struct user (suitable for HP/UX 10.10).

Wed Sep 11 1996 - wnl (3.5beta2)
        Changes to sunos5 module:  Removed WCPU column since it is meaningless
        on a SVR4-based system.  Added THR column to show number of threads
        for each process.  This was not straightforward: the information is
        not stored in prpsinfo but rather in prstatus.

Tue Sep 10 1996 - wnl (3.5beta1)
        Added patches for sunos4mp to provide order support.
        Added irix62 module.
        Changed prime.c to include stdio.h for printf prototype.
        Added conditional code to os.h and utils.c to handle systems
        where sys_errlist is defined in stdio.h (such as NetBSD).

Mon Sep 09 1996 - wnl (3.5beta1)
        Removed tar and shar rules from Makefile.X -- don't need them anymore.
        Added -v option to display version number.  Updated man page.

Thu Aug 29 1996 - wnl (3.4)
        Replaced modules (from Tim Pugh): next 32, next40.
        Fixed bug in username.c: hashing negative uids.

Thu Aug 22 1996 - wnl (3.4beta3)
        Patched modules:  ultrix4, sunos4, sunos5, utek, decosf1, irix5.
        Added modules: next40, next32.
        Fixed procstates update bug in display.c.
        Fixed divide by zero bug in utils.c.
        Fixed bad number in layout.h
        Minor fixes to Configure.
        Complete overhaul of FAQ.

Tue Feb 13 1996 - wnl (3.4beta3)
        Added convex module from Warren Vosper (originally written by
        William Jones).

Tue Feb 13 1996 - wnl (3.4beta2)
        Fixed format_k in utils.c to calculate K and M values correctly.
        Added check for gigabyte values ('G').  Changed sumamry_format
        in display.c to use format_k where appropriate.
        Changed creation of distribution tar file to place everything in
        a top level directory.

Tue Jan 30 1996 - wnl (3.4beta2)
        Added m_aix41 module.  Added new tag type to module comments:
        TERMCAP, which defined the library to use for a termcap library.
        If no TERMCAP tag is found in the module's initial comment, then
        Configure will default to "-ltermcap".  AIX needs this since it
        put all the termcap routines in libcurses(!)

        Added m_bsdos2 (found lingering in my mailbox).
        Updated m_svr4 to include support for NCR multiprocessors.
        Fixed small bug in utils.c

Thu Jan 25 1996 - wnl (3.4beta1)
        Fixed m_sunos5 invocation of gettimeofday to include "NULL" as
        second argument.  This provides compatability with the Posix-
        compliant template provided with SunOS 5.5, but doesn't hurt
        previous versions since they do bother with a template for that
        function.

        Made changes (recommended by net users) to hpux10, ultrix4,
        netbsd10, aux3 (replaced aux31).  Added module for linux.

Fri Oct 10 1995 - wnl (3.4beta1)
        Added user-contributed modules for SCO Unix, IRIX 5, HP/UX 10,
        Pyramid DC/OSX.  Changed Configure so that it runs in environments
        whose c-shells have no 'eval'(!).  Added support for multiple sort
        ordering methods via the -o switch.  This option requires support
        from the machine dependent module: such support was added to
        sunos5 (thus sunos54) and sunos4.

        display.c:  Changed CPU states display line to shorten the leading
        tag if the data won't fit in the current width.  Fixed a divide-by-
        zero bug that affected ultrasparc servers (and potentially other
        systems).

        m_sunos5.c: Now asks the system for the correct pagesize rather than
        assuming it is 4K.

Thu Mar  2 1995 - wnl (3.3 RELEASE)
        Added module netbsd10 and renamed netbsd to netbsd08.  Changed
        Configure so that it does not use an initial default module name.
        Made other compatability fixes to Configure.  Added comments to
        decosf1 concerning optimizer bug.  Other documentation changes.
        Added use of "prime.c" to Configure script.

Tue Feb  7 1995 - wnl (3.3beta6)
        Still one more beta....
        Fixes for sunos5 2.4 gcc core dump (it was an alignment problem).
        Fixed and improvements for decosf1 (including use of format_k
        for proper SIZE column formatting).  Added modules freebsd20 and
        ncr3000.

Thu Feb  2 1995 - wnl (3.3beta5)
        One more beta....
        Fixed a few bugs in the sunos5 port pertaining to casting and
        very large memory counts.  Added "ifndef HAVE_GETOPT" to getopt.c
        to provide for conditional compilation of the getopt function.
        Those systems that have getopt in libc can add -DHAVE_GETOPT to
        the CFLAGS line in the module to prevent the function from being
        compiled.  Added sunos54 module to accomodate SunOS 5.4
        peculiarities.  Added module for aux3.1.

Wed Jan  4 1995 - wnl (3.3beta4)
        This is really taking too long......sigh.
        Fixed SIGWINCH handling once and for all.  It now remembers the
        number of processes you want displayed even thru window resizes.
        Fixed buffer conflict in utils.c (itoa and itoa7).
        Lots of small improvements to the various modules were made over
        the past month: too numberous to list here.  SunOS 5 module made
        more secure thru use of seteuid calls (other SVR4 modules should
        be modified similarly).  One final MP fix to sunos5, too.  Module
        for decosf1 was modified to accomodate V3.0.

Mon Apr 18 1994 - wnl (3.3beta3)
        I think I finally got a sunos5 module that will work on MP
        machines.  Fixed cpu states figure in osmp41a so that 
        percentages never exceed 100%.  Added shell script "install"
        since Unix vendors can't seem to make up their minds on what
        options they want to use for the one that comes with the OS.
        Added netbsd modules from Christos.  Fixed lots of other little
        things over the past few months that I have long since forgotten.

Wed Dec 15 1993 - wnl (3.3beta2)
        Added module patches from various users:  hpux9, sunos5.
        Fixed bug with batch mode (screen_width wasn't getting set).
        Changes to accomodate 64 bit machines.
        Fixed some bugs in command parsing ("renice 19 " did something
        unexpected).

Mon Aug 30 1993 - wnl (3.3beta)
        Added lots of little patches from various users.
        Added routines to utils.c for intelligent formatting of kilobytes
        and time.  These are intended to be used in the modules when
        formatting a process line.  Added code to "summary_format" in
        display.c to do intelligent formatting of memory quantities.
        Redid display.c to allow for varying line widths and dynamic
        reallocation of the screen buffer.
        Added a SIGWINCH handler to top.c!
        Added a constant, MAX_COLS, to top.h which defines the absolute
        widest line we will ever allow.  Changed allocations of "char fmt"
        in all machine modules to use this constant rather than an abitrary
        number.

Fri Aug 13 1993 - wnl (3.3)
        Changed return value definition of time-related functions in top.c,
        display.c, and m_ultrix4.c to time_t (stuart@coral.cs.jcu.edu.au).
        Fixed bug in display.c: line_update when start != 0.

Wed Aug  4 1993 - wnl (3.2 release)
        Changes to Configure from Paul Vixie.  Added modules for hpux9 and
        bsd386.

Tue Jul 13 1993 - wnl (3.1 release)
        More small changes and minor bug fixes.  Brought bsd44 up to date
        and added a module for svr4.2.  Changed shar packaging to use Rich
        Salz's cshar stuff.

Wed Jul  7 1993 - wnl (3.1BETA)
        More changes and bug fixes to Configure.  Applied some other
        minor bug fixes and suggestions from the beta testers.  Added
        the "metatop" shell script and the "installmeta" rule to the
        Makefile to make handling multiple machine models and OS versions
        easier.  Added INSTALL and FAQ files.

Tue May 18 1993 - wnl (3.1BETA)
        Changed Configure to be compatible with most SVR4 environments
        (differing output from "ls -lg").  Also changed Configure,
        Makefile.X, etc., to look for module files in the subdirectory
        "machine" (thanks to Christos Zoulas).

Tue Apr 20 1993 - wnl (3.1BETA)
        Changed both occurences of "ls -1" in Configure to "ls".  This
        SHOULD produce the same result, and has the advantage that it
        doesn't produce an error on a system 5 machine.  Integrated other
        changes recommended in the first round of beta testing.

Wed Mar 10 1993 - wnl (3.1BETA)
        MAJOR CHANGE:  I have added a required function to all machine
        dependent modules, called proc_owner.  It takes a pid as an argument
        and returns the uid of the process's owner.  Such capability is 
        necessary for top to run securely as a set-uid program, something
        that is needed for SVR4 implementations to read /proc.  I have
        retrofitted all modules except dgux with this function, but was
        not able to test most of them.  Top should now run securely as
        a setuid program.  Added 386bsd and sunos5 modules.  Added sunos4mp
        module for MP Suns.

Sat Feb 20 1993 - wnl (3.1ALPHA)
        Modified top.c and commands.c to compile correctly on System V
        derived Unixes (especially SVR4), but in a way that doesn't rely
        on an oracle-like declaration (that is, I don't use "ifdef SYSV").
        Fixed some bugs in "Configure" and "getans".  Added inspection of
        env variable "TOP" for options, and made -I default to showing
        idle processes.  Added "u" command to change username restriction
        on the fly.  Created shell script "suntop" for poor multi-version
        SunOS folks (like myself).

Wed Jun  3 1992 - wnl (3.0)
        "max_topn" wasn't being used everywhere it was supposed to be
        in top.c.  Many cosmetic changes, including copyright notices in
        all the .c files.  Version number is now handled by version.c and
        reflects the current patchlevel (which is initially set to 0).
        Changed Configure and Makefile to allow configurable variables for
        certain commands:  shell, cc, awk, install.  Updated README and
        Porting.  Ready to release to the world!

Mon May 18 1992 - wnl (2.9BETA)
        Added modules provided by Christos Zoulas.  Replaced screen.c
        with one modified by Christos and that will appropriately select
        and handle the sgtty, termio, or termios system.  Integrated many
        other changes recommended by Christos.  Fixed (I hope) the "-b"
        batch mode display bug.  Had to change loadavg to load_avg to avoid
        a conflict with 4.4BSD.  

Mon Apr 27 1992 - wnl (2.8BETA)
        Added modules provided by Daniel Trinkle.  Added patchlevel.h,
        but the patch level is not yet reflected in the version number.
        Cleaned up m_sunos4.c a little.

Wed Apr 22 1992 - wnl (2.8BETA)
        Major internal reorganization.  All of the system dependent stuff
        is now really and truly separated from everything else.  The
        system dependent functions are contained in a separate .c file
        called a "module".  The Configure script knows how to find and
        set up these modules, but the human installer still needs to tell
        Configure which module to use (no automagic determination of 
        machine type---sorry).  Added -U option to specify one user's
        processes, but there is no corresponding command...yet.  Other
        changes and improvements too numerous to mention here.  Currently
        there are only two modules:  sunos4 and umax.  But after this beta
        release is sent around, I expect more to be written.  I just hope
        that the machine-dependent abstractions don't need to change in
        the process.

Thu Mar 26 1992 - wnl (2.7BETA)
        Beta release with minimal architecture support.  Updated README
        and added a first cut at a Porting guide.  Added ioctl TIOCGWINSZ
        code from top2.5+ (courtesy of David MacKenzie).  I didn't even
        try porting the Ultrix support since I don't have access to an
        Ultrix machine.

Fri Oct 11 1991 - wnl (2.6)
        This version was not widely released.  It contained many changes.
        Here are the major ones:

        Put in Vixie's idle process hack.

        Enhanced type field in new_message to handle delayed messages.

        Changed u_process to automatically adjust for varying lines of
        output.  Management of screenbuf should now be completely contained
        in display.c.  Removed now extraneous code from CMD_number[12]
        portion of command switch in top.c.  This was the stuff that dealt
        with zeroing out lines in screenbuf.

        Finally made it all work correctly on a 386i.  Problems I had to
        overcome: kvm_nlist doesn't return 0 on success as advertised (it
        returns 1 instead); the results of a kvm_nlist are different
        (n_type can be zero even for a symbol that exists).

        Serious rearrangement for processor dependent stuff.  All nlists
        are now in separate files with the suffix ".nlist".  Most machine
        specific code is in "machine.c" surrounded by appropriate ifdefs---
        the goal is to eventually have all machine specific code in this
        file.  Managed to find a way to detect SunOS 4.x at compile-time:
        this is contained in the include file "sun.h".  Completely changed
        the memory display line for SunOS 4.x---it now displays a far
        more appropriate report.

        Created the shell script "Configure" to aid in the configuration
        step.

        Fixed a bug in init_termcap:  it will now tolerate an environment
        which does not have TERM defined (thanks to Sam Horrocks for
        pointing this out).

Tue Aug  9 1988 - wnl (2.5)
        Added changes to make top work under version 4.0 of the Sun
        operating system.  Changes were provided by Scott Alexander of the
        University of Pennsylvania.  Thanks!  Compile with "-Dsunos4" to
        get them.  Virtual memory statistics are not readily accessible
        under 4.0, so they don't show up in the output.

Thu Jul 31 1987 - wnl (2.4)
        Fixed a problem with the 4.0 Pyramid code.  The label "cp_time"
        doesn't exist in the 4.0 kernel anymore.  I think the code Carl
        sent me wants "percpu" instead.  That is what I am using and it
        appears to work.  375 code is still untested (at least by me).
        Also picked a great deal of lint out of the source.  Lint now only
        complains about a very few nitpicky things (there are far too many
        calls to "printf" to put a "(void)" in front of!), at least under
        SunOS.

Tue Jul 28 1987 - wnl (2.4a)
        Added changes for a Symmetrics Computer Systems s/375 machine.
        Changes were provided by Paul Vixie.  Thanks!  According to Mr.
        Vixie:  "These changes were not made at, by, or for SCS proper.
        SCS would probably be interested in them, but so far only the
        users' group has them.  They were made in February, 1987, to
        version 2.1 of the program, by Paul Vixie
        (dual!ptsfa!vixie!paul@ucbvax.Berkeley.EDU)."  His changes were
        integrated into version 2.3 to make version 2.4.

        The SCS peculiarities are summarized in Changes.scs.

Tue Jun  9 1987 - wnl (2.3 for real)
        Changed the includes for the extra code Carl sent me to only
        compile on Version 4.0 Pyramid machines.  This makes top still
        compilable on pre-4.0 Pyramids.  Specifically, this code is only
        compiled when both "pyr" and "CPUFOUND" are defined.

Wed Jun  3 1987 - wnl (2.3 with Pyramid additions)
        It's been a month and I still haven't done anything about
        distributing this version.  However, Carl Gutekunst from Pyramid
        has sent me some extra patches for some of the Pyramid code.  I
        just added those and will make them part of 2.3.  This fixes the
        following Pyramid problems:  adds the inclusion of <sys/systm.h>,
        uses the correct size for getting the kernel value _ccpu (this bug
        affected the Vax version as well), sums the elements of the percpu
        array to calculate a cp_time value (for OSx 4.0).

Fri May  1 1987 - wnl (2.3)
        I have finally finished all the changes for better support of
        oddbal terminals.  Added the low-level routine "clear_eol" which
        makes handling terminals without "ce" easy:  it uses spaces
        instead.  All direct uses of "clear_line" outside of screen.c have
        been changed to use this primitive.  A terminal with "os" is now
        handled in such that all situations that need overwriting are
        completely avoided (including several commands).  This required
        some changes to the way commands are translated into action (in
        "top.c").  Made several important changes to display.c to prevent
        overflowing of any of the fields.  Specifically, more than 99
        total processes and a cpu state that reaches 100%.  Had to make a
        small change to two casts in top.c, because the Sun 3.2 compiler
        was giving warnings on them.  Added the "-q" option which lets
        root run top at a nice of -20 (in case he thinks he really needs it).

Tue Dec 30 1986 - wnl (2.2)
        I think I fixed a bug reported by Julian Onions at Nottingham.
        Occasionally, top will core dump when the sprintf in either
        i_process or u_process overflows due to an exceptionally
        unrealistic time value.  I think it highly unlikely that top can
        get a bad proc structure (although I suppose it is possible), but
        the process time is read from the user structure, and that can
        sometimes be part garbage.  So, "get_ucpu" checks the value it
        returns to make sure its formatted form will not overflow the
        sprintf.  If this doesn't fix the bug, then more drastic measures
        will be necessary.  I plan to make this version the official
        "top 2.2".  [[ This version was never distributed very widely. ]]

Tue Dec  2 1986 - wnl (2.2c)
        Added to top.c the notion of a "failed command".  When a command
        produces a message (on the message line), an update does not
        follow it.  Before, the message was written and a new display was
        shown---purposefully not overwriting the message.  But the
        improvements to handle overstriking terminals and terminals
        without "ce" clear the screen before every display, which would
        erase the message.  Now, the message is displayed and top waits
        another full time interval before updating the display.  This
        works much better all around.

Mon Nov 24 1986 - wnl (2.2b)
        Created a new file, utils.c, and made appropriate changes to
        Makefile.  This new file holds all utility functions that can and
        may be used by more than one "module".  Improved i_memory and
        u_memory (display.c) so that screen updates for the values
        displayed are only changed when necessary.  Also made the line
        look better:  the last fixes made for a rather ugly display.
        Added the locally defined constant "LoadMax" and added code to
        top.c to send the cursor home after a space command is entered if
        the load average is higher than "LoadMax".  This provides visual
        feedback on loaded systems.

Mon Nov  3 1986 - wnl (2.2a)
        Widened the format for memory usage so that it can display 5
        digits.  This makes that line look a little ugly---maybe I'll fix
        that later.  Screen handling now understands "os" and a missing
        "ce".  It treats them identically:  clear the screen between each
        display.  Screen handling code now uses "cd" when appropriate
        (i.e.:  when user has shortened the screen).  Made i_loadave clear
        then screen and took out most of the explicit calls to "clear" in
        top.c.  This method is cleaner, especially in conjunction with
        "os" handling.  Added preprocessor variable "RANDOM_PW" for
        systems that access the passwd file randomly (Sun's yp and 4.3).
        With "RANDOM_PW" set, "getpwuid" is used instead of "getpwnam",
        but uid->username mappings are still hashed internally (because
        that is still faster than going to disk).

Mon Oct  6 1986 - wnl (2.1)
        A bug with the kill command was pointed out by "dciem!tim"---
        specifying a signal by name did not work correctly.  This bug has
        been fixed with a simple change to commands.c.  Another bug made
        the cpu state percentages incorrect the first time they were
        displayed.  This bug has also been fixed (changed top.c).

Thu Sep  4 1986 - wnl (2.0, at last)
        This is the version that will (hopefully) get released to the
        world as top 2.0.
        Added the "r" and "k" commands for renice and kill, respectively.
        This required adding a way to handle system call errors, and the
        addition of the "e" command.  Help screen and manual page were
        changed to reflect this change.  Changed all "#ifdef SUN" directives
        to "#ifdef sun", and changed all "#ifdef PYRAMID" directives to
        "#ifdef pyr".  As much as I hate those choices of preprocessor
        names (they too easily conflict with real variable names), it does
        make automatic compilation possible---people don't have to change
        the Makefile anymore for specific machines.  The manual page was
        changed to automatically incorporate the defaults as set in the
        Makefile (including an infinite value for TOPN) and the way the
        manual page is generated by the Makefile was changed to make
        maintenance of this information automatic.

Mon Jul 28 1986 - wnl (still pre 2.0)
        Real close now.  I put in a new definition for the macro "pagetok"
        that does an explicit shift of a constant expression involving
        PGSHIFT.  Appropriate checks are made if PGSHIFT is to small.
        "pagetok" is now used exclusively everywhere to convert kernel
        clicks to kilobytes.  I added a full blown interactive mode with
        the ability to change some of the runtime parameters (how many to
        display, time delay, etc.) while top is running.  I also
        incorporated a few ideas from the net:  control characters in the
        command name are replaced with '?'; the '-S' option makes the
        swapper and pager visible; options have been added to control the
        number of displays produced (this makes it easier to make
        performance snapshots with top).  I have also added the notion of
        "infinite" values for number of processes and number of displays.
        I fixed a long-standing bug in the uid to username mapping code
        that was only aggravated on the pyramids:  it was an ill-defined
        expression (akin to i = i++).  I tweaked the proc_compar routine
        for qsort slightly so that stopped processes were more likely to
        show up.  Manual page was updated to reflect all changes
        noticeable to the user.

Tue Jul  1 1986 - wnl (pre 2.0 -- 1.9999?)
        In the process of major revamping on the way to version 2.0.
        I have completely done away with curses by adding my own screen
        management routines in a separate file (screen.c).  The rationale
        for this is that top knows a whole lot more about what is and is
        not redundant on the screen and can compare simple integer values
        where curses would have to compare strings.  This has turned out
        to be a very big win speed-wise.  The proc_compar routine for
        sorting has been rewritten to include several more keys.  I
        decided this was necessary when I noticed that the "top" process
        itself kept disappearing off the top 10 list on a Sun-3.  All the
        processes had the same percentage (0%) and the sort wasn't really
        doing anything worthwhile.  I changed the expression that computes
        memory usage to use the ctob macro instead of just assuming that
        pages were 512 bytes.  More work still needs to be done before
        this version is usable.  I changed options-processing to use
        getopt and added appropriate incantations to the Makefile.

Wed Feb 20 1985 - wnl (still 1.8)
        Put in the ifdef FOUR_ONE statements to make top still compilable
        on a 4.1 system.  Apparently, there are some users out there that
        need this functionality.  Oh well.  I don't guarantee any of it,
        since I can't test it.  Made appropriate changes to README and
        final installation related changes to Makefile.

Sat Feb  2 1985 - wnl (1.8)
        Removed all the ifdef FOUR_TWO statements and made "top" into a
        4.2 only program.  If someone really wants to still run it on 4.1,
        then they can do all the work.  We don't have a 4.1 machine
        anymore, so I don't even know if the thing still works under 4.1.
        Cleaned up the Makefile and the README.  Added installation rules
        to the Makefile, as requested by several sites.  Fixed a very
        obscure divide-by-zero bug.  Added a second "key" to the qsort
        comparison function (proc_compar) so that comparisons are based on
        cpu ticks if the percentages are equal (provided by Jonathon
        Feiber at Sun).

Tue Dec 11 1984 - wnl (1.7)
        Added the virtual and real memory status line to the header area
        (provided by Jonathon Feiber at Sun)

Tue Nov 20 1984 - wnl (1.6)
        Added an "exit" if sbrk's fail.  Added changes from Jonathon
        Feiber at Sun:  ifdef SUN to make top work on Suns (they don't use
        doubles in the proc structure), register declarations, check for
        getting a user structure that has disappeared since the proc array
        was read (it used to die, now it just shows the process as swapped).

Tue Nov 13 1984 - wnl (1.5)
        If the number of displayable processes ("active_procs") was less
        than the number of requested processes ("topn"), top would
        segmentation fault.  This bug has been fixed.  Thanks to Prentiss
        Riddle at ut-sally for pointing out the existence of this bug.

Tue Oct 23 1984 - wnl (1.4)
        Finally fixed the hash table bug that caused processes owned by
        root to sometimes appear with either no name or a different name
        that had UID 0 (such as "operator").  Removed all the ifdef DEBUG
        blocks to make top ready for distribution to the real world.

Sun Apr  8 1984 - wnl (still 1.3)
        Made some slight changes to the display format.  It now looks more
        aesthetically pleasing.  Added some preprocessor constants so that
        the two defaults (number of processes and seconds of delay) easier
        to change.

Thu Apr  5 1984 - wnl (1.3)
        Changed the order in which things are done at initialization time.
        This way, if an error occurs before starting the main loop, curses
        will never get started.  Also changed other error handlers so that
        endwin() is called before any flavor of exit.  Specifying a number
        of processes that is more than the screen can handle is no longer
        fatal.  It displays a warning message and pretends the user
        specified the maximum for the screen.  Finally cured all the TSTP
        blues (well, almost all).  I removed my TSTP handler and convinced
        the system to always use the one that curses sets up.  Turns out
        that "sleep" was stepping all over it during a pause.  So, I don't
        use sleep anymore.  The only problem that remains with it now is
        redrawing the old display before updating it after a pause.

Tue Apr  3 1984 - wnl (from 1.0 to 1.2)
        I changed the format of the TIME column from just "seconds" to
        "minutes:seconds".  I also made pausing work correctly.  Screen
        redraws with an up to date display.  For compatibility with 4.2, I
        changed the name of the "zero" function to "bzero".  The makefile
        has been altered to handle versions for 4.1 and 4.2, and README
        has been updated to reflect these recent changes.