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745 lines
30 KiB
Plaintext
745 lines
30 KiB
Plaintext
This file describes various problems that have been encountered
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in compiling, installing and running GNU Emacs.
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* `Pid xxx killed due to text modification or page I/O error'
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On HP/UX, you can get that error when the Emacs executable is on an NFS
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file system. HP/UX responds this way if it tries to swap in a page and
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does not get a response from the server within a timeout whose default
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value is just ten seconds.
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If this happens to you, extend the timeout period.
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* `expand-file-name' fails to work on any but the machine you dumped Emacs on.
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On Ultrix, if you use any of the functions which look up information
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in the passwd database before dumping Emacs (say, by using
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expand-file-name in site-init.el), then those functions will not work
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in the dumped Emacs on any host but the one Emacs was dumped on.
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The solution? Don't use expand-file-name in site-init.el, or in
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anything it loads. Yuck - some solution.
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I'm not sure why this happens; if you can find out exactly what is
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going on, and perhaps find a fix or a workaround, please let us know.
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Perhaps the YP functions cache some information, the cache is included
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in the dumped Emacs, and is then inaccurate on any other host.
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* On some variants of SVR4, Emacs does not work at all with X.
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Try defining BROKEN_FIONREAD in your config.h file. If this solves
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the problem, please send a bug report to tell us this is needed; be
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sure to say exactly what type of machine and system you are using.
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* Linking says that the functions insque and remque are undefined.
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Change oldXMenu/Makefile by adding insque.o to the variable OBJS.
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* Emacs fails to understand most Internet host names, even though
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the names work properly with other programs on the same system.
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This typically happens on Suns and other systems that use shared
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libraries. The cause is that the site has installed a version of the
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shared library which uses a name server--but has not installed a
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similar version of the unshared library which Emacs uses.
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The result is that most programs, using the shared library, work with
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the nameserver, but Emacs does not.
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The fix is to install an unshared library that corresponds to what you
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installed in the shared library, and then relink Emacs.
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* On a Sun running SunOS 4.1.1, you get this error message from GNU ld:
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/lib/libc.a(_Q_sub.o): Undefined symbol __Q_get_rp_rd referenced from text segment
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The problem is in the Sun shared C library, not in GNU ld.
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The solution is to install Patch-ID# 100267-03 from Sun.
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* Self documentation messages are garbled.
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This means that the file `etc/DOC-...' doesn't properly correspond
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with the Emacs executable. Redumping Emacs and then installing the
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corresponding pair of files should fix the problem.
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* Trouble using ptys on AIX.
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People often install the pty devices on AIX incorrectly.
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Use `smit pty' to reinstall them properly.
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* Shell mode on HP/UX gives the message, "`tty`: Ambiguous".
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christos@theory.tn.cornell.edu says:
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The problem is that in your .cshrc you have something that tries to
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execute `tty`. If you are not running the shell on a real tty then
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tty will print "not a tty". Csh expects one word in some places,
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but tty is giving it back 3.
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The solution is to add a pair of quotes around `tty` to make it a single
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word:
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if (`tty` == "/dev/console")
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should be changed to:
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if ("`tty`" == "/dev/console")
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Even better, move things that set up terminal sections out of .cshrc
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and into .login.
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* Using X Windows, control-shift-leftbutton makes Emacs hang.
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Use the shell command `xset bc' to make the old X Menu package work.
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* Emacs running under X Windows does not handle mouse clicks.
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* `emacs -geometry 80x20' finds a file named `80x20'.
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One cause of such problems is having (setq term-file-prefix nil) in
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your .emacs file. Another cause is a bad value of EMACSLOADPATH in
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the environment.
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* Emacs starts in a directory other than the one that is current in the shell.
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If the PWD environment variable exists, Emacs uses this variable as
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the initial working directory.
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Some shells automatically update this variable, while other shells fail
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to do so. If you use two such shells in combination, the variable can
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end up wrong. This confuses Emacs.
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The solution is to put something in the start-up file for the shell
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that does not update PWD, to get rid of that environment variable.
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For example, in csh, use `unsetenv PWD'.
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* Emacs gets error message from linker on Sun.
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If the error message says that a symbol such as `f68881_used' or
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`ffpa_used' or `start_float' is undefined, this probably indicates
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that you have compiled some libraries, such as the X libraries,
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with a floating point option other than the default.
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It's not terribly hard to make this work with small changes in
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crt0.c together with linking with Fcrt1.o, Wcrt1.o or Mcrt1.o.
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However, the easiest approach is to build Xlib with the default
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floating point option: -fsoft.
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* Emacs fails to get default settings from X Windows server.
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The X library in X11R4 has a bug; it interchanges the 2nd and 3rd
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arguments to XGetDefaults. Define the macro XBACKWARDS in config.h to
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tell Emacs to compensate for this.
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I don't believe there is any way Emacs can determine for itself
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whether this problem is present on a given system.
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* Keyboard input gets confused after a beep when using a DECserver
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as a concentrator.
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This problem seems to be a matter of configuring the DECserver to use
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7 bit characters rather than 8 bit characters.
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* M-x shell persistently reports "Process shell exited abnormally with code 1".
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This happened on Suns as a result of what is said to be a bug in Sunos
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version 4.0.x. The only fix was to reboot the machine.
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* Programs running under terminal emulator do not recognize `emacs'
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terminal type.
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The cause of this is a shell startup file that sets the TERMCAP
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environment variable. The terminal emulator uses that variable to
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provide the information on the special terminal type that Emacs
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emulates.
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Rewrite your shell startup file so that it does not change TERMCAP
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in such a case. You could use the following conditional which sets
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it only if it is undefined.
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if ( ! ${?TERMCAP} ) setenv TERMCAP ~/my-termcap-file
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Or you could set TERMCAP only when you set TERM--which should not
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happen in a non-login shell.
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* X Windows doesn't work if DISPLAY uses a hostname.
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People have reported kernel bugs in certain systems that cause Emacs
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not to work with X Windows if DISPLAY is set using a host name. But
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the problem does not occur if DISPLAY is set to `unix:0.0'. I think
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the bug has to do with SIGIO or FIONREAD.
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You may be able to compensate for the bug by doing (set-input-mode nil nil).
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However, that has the disadvantage of turning off interrupts, so that
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you are unable to quit out of a Lisp program by typing C-g.
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The easy way to do this is to put
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(setq x-sigio-bug t)
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in your site-init.el file.
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* Problem with remote X server on Suns.
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On a Sun, running Emacs on one machine with the X server on another
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may not work if you have used the unshared system libraries. This
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is because the unshared libraries fail to use YP for host name lookup.
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As a result, the host name you specify may not be recognized.
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* Watch out for .emacs files and EMACSLOADPATH environment vars
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These control the actions of Emacs.
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~/.emacs is your Emacs init file.
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EMACSLOADPATH overrides which directories the function
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"load" will search.
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If you observe strange problems, check for these and get rid
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of them, then try again.
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* Shell mode ignores interrupts on Apollo Domain
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You may find that M-x shell prints the following message:
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Warning: no access to tty; thus no job control in this shell...
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This can happen if there are not enough ptys on your system.
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Here is how to make more of them.
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% cd /dev
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% ls pty*
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# shows how many pty's you have. I had 8, named pty0 to pty7)
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% /etc/crpty 8
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# creates eight new pty's
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* Fatal signal in the command temacs -l loadup inc dump
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This command is the final stage of building Emacs. It is run by the
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Makefile in the src subdirectory, or by build.com on VMS.
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It has been known to get fatal errors due to insufficient swapping
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space available on the machine.
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On 68000's, it has also happened because of bugs in the
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subroutine `alloca'. Verify that `alloca' works right, even
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for large blocks (many pages).
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* test-distrib says that the distribution has been clobbered
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* or, temacs prints "Command key out of range 0-127"
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* or, temacs runs and dumps xemacs, but xemacs totally fails to work.
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* or, temacs gets errors dumping xemacs
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This can be because the .elc files have been garbled. Do not be
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fooled by the fact that most of a .elc file is text: these are
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binary files and can contain all 256 byte values.
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In particular `shar' cannot be used for transmitting GNU Emacs.
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It typically truncates "lines". What appear to be "lines" in
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a binary file can of course be of any length. Even once `shar'
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itself is made to work correctly, `sh' discards null characters
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when unpacking the shell archive.
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I have also seen character \177 changed into \377. I do not know
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what transfer means caused this problem. Various network
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file transfer programs are suspected of clobbering the high bit.
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If you have a copy of Emacs that has been damaged in its
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nonprinting characters, you can fix them:
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1) Record the names of all the .elc files.
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2) Delete all the .elc files.
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3) Recompile alloc.c with a value of PURESIZE twice as large.
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You might as well save the old alloc.o.
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4) Remake xemacs. It should work now.
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5) Running xemacs, do Meta-x byte-compile-file repeatedly
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to recreate all the .elc files that used to exist.
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You may need to increase the value of the variable
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max-lisp-eval-depth to succeed in running the compiler interpreted
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on certain .el files. 400 was sufficient as of last report.
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6) Reinstall the old alloc.o (undoing changes to alloc.c if any)
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and remake temacs.
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7) Remake xemacs. It should work now, with valid .elc files.
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* temacs prints "Pure Lisp storage exhausted"
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This means that the Lisp code loaded from the .elc and .el
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files during temacs -l loadup inc dump took up more
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space than was allocated.
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This could be caused by
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1) adding code to the preloaded Lisp files
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2) adding more preloaded files in loadup.el
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3) having a site-init.el or site-load.el which loads files.
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Note that ANY site-init.el or site-load.el is nonstandard;
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if you have received Emacs from some other site
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and it contains a site-init.el or site-load.el file, consider
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deleting that file.
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4) getting the wrong .el or .elc files
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(not from the directory you expected).
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5) deleting some .elc files that are supposed to exist.
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This would cause the source files (.el files) to be
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loaded instead. They take up more room, so you lose.
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6) a bug in the Emacs distribution which underestimates
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the space required.
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If the need for more space is legitimate, change the definition
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of PURESIZE in puresize.h.
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But in some of the cases listed above, this problem is a consequence
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of something else that is wrong. Be sure to check and fix the real
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problem.
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* Changes made to .el files do not take effect.
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You may have forgotten to recompile them into .elc files.
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Then the old .elc files will be loaded, and your changes
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will not be seen. To fix this, do M-x byte-recompile-directory
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and specify the directory that contains the Lisp files.
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Emacs should print a warning when loading a .elc file which is older
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than the corresponding .el file.
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* The dumped Emacs (xemacs) crashes when run, trying to write pure data.
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Two causes have been seen for such problems.
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1) On a system where getpagesize is not a system call, it is defined
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as a macro. If the definition (in both unexec.c and malloc.c) is wrong,
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it can cause problems like this. You might be able to find the correct
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value in the man page for a.out (5).
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2) Some systems allocate variables declared static among the
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initialized variables. Emacs makes all initialized variables in most
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of its files pure after dumping, but the variables declared static and
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not initialized are not supposed to be pure. On these systems you
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may need to add "#define static" to the m- or the s- file.
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* Compilation errors on VMS.
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You will get warnings when compiling on VMS because there are
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variable names longer than 32 (or whatever it is) characters.
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This is not an error. Ignore it.
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VAX C does not support #if defined(foo). Uses of this construct
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were removed, but some may have crept back in. They must be rewritten.
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There is a bug in the C compiler which fails to sign extend characters
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in conditional expressions. The bug is:
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char c = -1, d = 1;
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int i;
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i = d ? c : d;
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The result is i == 255; the fix is to typecast the char in the
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conditional expression as an (int). Known occurrences of such
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constructs in Emacs have been fixed.
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* rmail gets error getting new mail
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rmail gets new mail from /usr/spool/mail/$USER using a program
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called `movemail'. This program interlocks with /bin/mail using
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the protocol defined by /bin/mail.
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There are two different protocols in general use. One of them uses
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the `flock' system call. The other involves creating a lock file;
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`movemail' must be able to write in /usr/spool/mail in order to do
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this. You control which one is used by defining, or not defining,
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the macro MAIL_USE_FLOCK in config.h or the m- or s- file it includes.
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IF YOU DON'T USE THE FORM OF INTERLOCKING THAT IS NORMAL ON YOUR
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SYSTEM, YOU CAN LOSE MAIL!
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If your system uses the lock file protocol, and fascist restrictions
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prevent ordinary users from writing the lock files in /usr/spool/mail,
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you may need to make `movemail' setgid to a suitable group such as
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`mail'. You can use these commands (as root):
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chgrp mail movemail
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chmod 2755 movemail
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* Emacs won't work with X-windows if the value of DISPLAY is HOSTNAME:0.
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* GNUs can't make contact with the specified host for nntp.
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Some people have found that Emacs was unable to connect to the local
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host by name, as in DISPLAY=prep:0 if you are running on prep, but
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could handle DISPLAY=unix:0. Here is what tale@rpi.edu said:
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Seems as
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though gethostbyname was bombing somewhere along the way. Well, we
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had just upgrade from SunOS 3.5 (which X11 was built under) to SunOS
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4.0.1. Any new X applications which tried to be built with the pre
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OS-upgrade libraries had the same problems which Emacs was having.
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Missing /etc/resolv.conf for a little while (when one of the libraries
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was built?) also might have had a hand in it.
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The result of all of this (with some speculation) was that we rebuilt
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X and then rebuilt Emacs with the new libraries. Works as it should
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now. Hoorah.
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If you have already installed the name resolver in the file libresolv.a,
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then you need to compile Emacs to use that library. The easiest way to
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do this is to add to config.h a definition of LIBS_SYSTEM, LIBS_MACHINE
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or LIB_STANDARD which uses -lresolv. Watch out! If you redefine a macro
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that is already in use in your configuration to supply some other libraries,
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be careful not to lose the others.
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Thus, you could start by adding this to config.h:
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#define LIBS_SYSTEM -lresolv
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Then if this gives you an error for redefining a macro, and you see that
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the s- file defines LIBS_SYSTEM as -lfoo -lbar, you could change config.h
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again to say this:
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#define LIBS_SYSTEM -lresolv -lfoo -lbar
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* Emacs spontaneously displays "I-search: " at the bottom of the screen.
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This means that Control-S/Control-Q "flow control" is being used.
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C-s/C-q flow control is bad for Emacs editors because it takes away
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C-s and C-q as user commands. Since editors do not output long streams
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of text without user commands, there is no need for a user-issuable
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"stop output" command in an editor; therefore, a properly designed
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flow control mechanism would transmit all possible input characters
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without interference. Designing such a mechanism is easy, for a person
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with at least half a brain.
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There are three possible reasons why flow control could be taking place:
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1) Terminal has not been told to disable flow control
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2) Insufficient padding for the terminal in use
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3) Some sort of terminal concentrator or line switch is responsible
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First of all, many terminals have a set-up mode which controls
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whether they generate flow control characters. This must be
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set to "no flow control" in order for Emacs to work. Sometimes
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there is an escape sequence that the computer can send to turn
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flow control off and on. If so, perhaps the termcap `ti' string
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should turn flow control off, and the `te' string should turn it on.
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Once the terminal has been told "no flow control", you may find it
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needs more padding. The amount of padding Emacs sends is controlled
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by the termcap entry for the terminal in use, and by the output baud
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rate as known by the kernel. The shell command `stty' will print
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your output baud rate; `stty' with suitable arguments will set it if
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it is wrong. Setting to a higher speed causes increased padding. If
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the results are wrong for the correct speed, there is probably a
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problem in the termcap entry. You must speak to a local Unix wizard
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to fix this. Perhaps you are just using the wrong terminal type.
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For terminals that lack a "no flow control" mode, sometimes just
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giving lots of padding will prevent actual generation of flow control
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codes. You might as well try it.
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If you are really unlucky, your terminal is connected to the computer
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through a concentrator which sends flow control to the computer, or it
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insists on sending flow control itself no matter how much padding you
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give it. You are screwed! You should replace the terminal or
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concentrator with a properly designed one. In the mean time,
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some drastic measures can make Emacs semi-work.
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One drastic measure to ignore C-s and C-q, while sending enough
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padding that the terminal will not really lose any output. To make
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such an adjustment, you need only invoke the function
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enable-flow-control-on with a list of terminal types in your own
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.emacs file. As arguments, give it the names of one or more terminal
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types you use which require flow control adjustments.
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Here's an example:
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(enable-flow-control-on "vt200" "vt300" "vt101" "vt131")
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An even more drastic measure is to make Emacs use flow control.
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To do this, evaluate the Lisp expression (set-input-mode nil t).
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Emacs will then interpret C-s and C-q as flow control commands. (More
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precisely, it will allow the kernel to do so as it usually does.) You
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will lose the ability to use them for Emacs commands. Also, as a
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consequence of using CBREAK mode, the terminal's Meta-key, if any,
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will not work, and C-g will be liable to cause a loss of output which
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will produce garbage on the screen. (These problems apply to 4.2BSD;
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they may not happen in 4.3 or VMS, and I don't know what would happen
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in sysV.) You can use keyboard-translate-table, as shown above,
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to map two other input characters (such as C-^ and C-\) into C-s and
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C-q, so that you can still search and quote.
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I have no intention of ever redesigning the Emacs command set for
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the assumption that terminals use C-s/C-q flow control. This
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flow control technique is a bad design, and terminals that need
|
|
it are bad merchandise and should not be purchased. If you can
|
|
get some use out of GNU Emacs on inferior terminals, I am glad,
|
|
but I will not make Emacs worse for properly designed systems
|
|
for the sake of inferior systems.
|
|
|
|
* Control-S and Control-Q commands are ignored completely.
|
|
|
|
For some reason, your system is using brain-damaged C-s/C-q flow
|
|
control despite Emacs's attempts to turn it off. Perhaps your
|
|
terminal is connected to the computer through a concentrator
|
|
that wants to use flow control.
|
|
|
|
You should first try to tell the concentrator not to use flow control.
|
|
If you succeed in this, try making the terminal work without
|
|
flow control, as described in the preceding section.
|
|
|
|
If that line of approach is not successful, map some other characters
|
|
into C-s and C-q using keyboard-translate-table. The example above
|
|
shows how to do this with C-^ and C-\.
|
|
|
|
* Control-S and Control-Q commands are ignored completely on a net connection.
|
|
|
|
Some versions of rlogin (and possibly telnet) do not pass flow
|
|
control characters to the remote system to which they connect.
|
|
On such systems, emacs on the remote system cannot disable flow
|
|
control on the local system.
|
|
|
|
One way to cure this is to disable flow control on the local host
|
|
(the one running rlogin, not the one running rlogind) using the
|
|
stty command, before starting the rlogin process. On many systems,
|
|
"stty start u stop u" will do this.
|
|
|
|
Some versions of tcsh will prevent even this from working. One way
|
|
around this is to start another shell before starting rlogin, and
|
|
issue the stty command to disable flow control from that shell.
|
|
|
|
* Screen is updated wrong, but only on one kind of terminal.
|
|
|
|
This could mean that the termcap entry you are using for that
|
|
terminal is wrong, or it could mean that Emacs has a bug handing
|
|
the combination of features specified for that terminal.
|
|
|
|
The first step in tracking this down is to record what characters
|
|
Emacs is sending to the terminal. Execute the Lisp expression
|
|
(open-termscript "./emacs-script") to make Emacs write all
|
|
terminal output into the file ~/emacs-script as well; then do
|
|
what makes the screen update wrong, and look at the file
|
|
and decode the characters using the manual for the terminal.
|
|
There are several possibilities:
|
|
|
|
1) The characters sent are correct, according to the terminal manual.
|
|
|
|
In this case, there is no obvious bug in Emacs, and most likely you
|
|
need more padding, or possibly the terminal manual is wrong.
|
|
|
|
2) The characters sent are incorrect, due to an obscure aspect
|
|
of the terminal behavior not described in an obvious way
|
|
by termcap.
|
|
|
|
This case is hard. It will be necessary to think of a way for
|
|
Emacs to distinguish between terminals with this kind of behavior
|
|
and other terminals that behave subtly differently but are
|
|
classified the same by termcap; or else find an algorithm for
|
|
Emacs to use that avoids the difference. Such changes must be
|
|
tested on many kinds of terminals.
|
|
|
|
3) The termcap entry is wrong.
|
|
|
|
See the file etc/TERMS for information on changes
|
|
that are known to be needed in commonly used termcap entries
|
|
for certain terminals.
|
|
|
|
4) The characters sent are incorrect, and clearly cannot be
|
|
right for any terminal with the termcap entry you were using.
|
|
|
|
This is unambiguously an Emacs bug, and can probably be fixed
|
|
in termcap.c, tparam.c, term.c, scroll.c, cm.c or dispnew.c.
|
|
|
|
* Output from Control-V is slow.
|
|
|
|
On many bit-map terminals, scrolling operations are fairly slow.
|
|
Often the termcap entry for the type of terminal in use fails
|
|
to inform Emacs of this. The two lines at the bottom of the screen
|
|
before a Control-V command are supposed to appear at the top after
|
|
the Control-V command. If Emacs thinks scrolling the lines is fast,
|
|
it will scroll them to the top of the screen.
|
|
|
|
If scrolling is slow but Emacs thinks it is fast, the usual reason is
|
|
that the termcap entry for the terminal you are using does not
|
|
specify any padding time for the `al' and `dl' strings. Emacs
|
|
concludes that these operations take only as much time as it takes to
|
|
send the commands at whatever line speed you are using. You must
|
|
fix the termcap entry to specify, for the `al' and `dl', as much
|
|
time as the operations really take.
|
|
|
|
Currently Emacs thinks in terms of serial lines which send characters
|
|
at a fixed rate, so that any operation which takes time for the
|
|
terminal to execute must also be padded. With bit-map terminals
|
|
operated across networks, often the network provides some sort of
|
|
flow control so that padding is never needed no matter how slow
|
|
an operation is. You must still specify a padding time if you want
|
|
Emacs to realize that the operation takes a long time. This will
|
|
cause padding characters to be sent unnecessarily, but they do
|
|
not really cost much. They will be transmitted while the scrolling
|
|
is happening and then discarded quickly by the terminal.
|
|
|
|
Most bit-map terminals provide commands for inserting or deleting
|
|
multiple lines at once. Define the `AL' and `DL' strings in the
|
|
termcap entry to say how to do these things, and you will have
|
|
fast output without wasted padding characters. These strings should
|
|
each contain a single %-spec saying how to send the number of lines
|
|
to be scrolled. These %-specs are like those in the termcap
|
|
`cm' string.
|
|
|
|
You should also define the `IC' and `DC' strings if your terminal
|
|
has a command to insert or delete multiple characters. These
|
|
take the number of positions to insert or delete as an argument.
|
|
|
|
A `cs' string to set the scrolling region will reduce the amount
|
|
of motion you see on the screen when part of the screen is scrolled.
|
|
|
|
* Your Delete key sends a Backspace to the terminal, using an AIXterm.
|
|
|
|
The solution is to include in your .Xdefaults the lines:
|
|
|
|
*aixterm.Translations: #override <Key>BackSpace: string(0x7f)
|
|
aixterm*ttyModes: erase ^?
|
|
|
|
This makes your Backspace key send DEL (ASCII 127).
|
|
|
|
* You type Control-H (Backspace) expecting to delete characters.
|
|
|
|
Put `stty dec' in your .login file and your problems will disappear
|
|
after a day or two.
|
|
|
|
The choice of Backspace for erasure was based on confusion, caused by
|
|
the fact that backspacing causes erasure (later, when you type another
|
|
character) on most display terminals. But it is a mistake. Deletion
|
|
of text is not the same thing as backspacing followed by failure to
|
|
overprint. I do not wish to propagate this confusion by conforming
|
|
to it.
|
|
|
|
For this reason, I believe `stty dec' is the right mode to use,
|
|
and I have designed Emacs to go with that. If there were a thousand
|
|
other control characters, I would define Control-h to delete as well;
|
|
but there are not very many other control characters, and I think
|
|
that providing the most mnemonic possible Help character is more
|
|
important than adapting to people who don't use `stty dec'.
|
|
|
|
If you are obstinate about confusing buggy overprinting with deletion,
|
|
you can redefine Backspace in your .emacs file:
|
|
(global-set-key "\b" 'delete-backward-char)
|
|
You may then wish to put the function help-command on some
|
|
other key. I leave to you the task of deciding which key.
|
|
|
|
* Editing files through RFS gives spurious "file has changed" warnings.
|
|
It is possible that a change in Emacs 18.37 gets around this problem,
|
|
but in case not, here is a description of how to fix the RFS bug that
|
|
causes it.
|
|
|
|
There was a serious pair of bugs in the handling of the fsync() system
|
|
call in the RFS server.
|
|
|
|
The first is that the fsync() call is handled as another name for the
|
|
close() system call (!!). It appears that fsync() is not used by very
|
|
many programs; Emacs version 18 does an fsync() before closing files
|
|
to make sure that the bits are on the disk.
|
|
|
|
This is fixed by the enclosed patch to the RFS server.
|
|
|
|
The second, more serious problem, is that fsync() is treated as a
|
|
non-blocking system call (i.e., it's implemented as a message that
|
|
gets sent to the remote system without waiting for a reply). Fsync is
|
|
a useful tool for building atomic file transactions. Implementing it
|
|
as a non-blocking RPC call (when the local call blocks until the sync
|
|
is done) is a bad idea; unfortunately, changing it will break the RFS
|
|
protocol. No fix was supplied for this problem.
|
|
|
|
(as always, your line numbers may vary)
|
|
|
|
% rcsdiff -c -r1.2 serversyscall.c
|
|
RCS file: RCS/serversyscall.c,v
|
|
retrieving revision 1.2
|
|
diff -c -r1.2 serversyscall.c
|
|
*** /tmp/,RCSt1003677 Wed Jan 28 15:15:02 1987
|
|
--- serversyscall.c Wed Jan 28 15:14:48 1987
|
|
***************
|
|
*** 163,169 ****
|
|
/*
|
|
* No return sent for close or fsync!
|
|
*/
|
|
! if (syscall == RSYS_close || syscall == RSYS_fsync)
|
|
proc->p_returnval = deallocate_fd(proc, msg->m_args[0]);
|
|
else
|
|
{
|
|
--- 166,172 ----
|
|
/*
|
|
* No return sent for close or fsync!
|
|
*/
|
|
! if (syscall == RSYS_close)
|
|
proc->p_returnval = deallocate_fd(proc, msg->m_args[0]);
|
|
else
|
|
{
|
|
|
|
* Vax C compiler bugs affecting Emacs.
|
|
|
|
You may get one of these problems compiling Emacs:
|
|
|
|
foo.c line nnn: compiler error: no table entry for op STASG
|
|
foo.c: fatal error in /lib/ccom
|
|
|
|
These are due to bugs in the C compiler; the code is valid C.
|
|
Unfortunately, the bugs are unpredictable: the same construct
|
|
may compile properly or trigger one of these bugs, depending
|
|
on what else is in the source file being compiled. Even changes
|
|
in header files that should not affect the file being compiled
|
|
can affect whether the bug happens. In addition, sometimes files
|
|
that compile correctly on one machine get this bug on another machine.
|
|
|
|
As a result, it is hard for me to make sure this bug will not affect
|
|
you. I have attempted to find and alter these constructs, but more
|
|
can always appear. However, I can tell you how to deal with it if it
|
|
should happen. The bug comes from having an indexed reference to an
|
|
array of Lisp_Objects, as an argument in a function call:
|
|
Lisp_Object *args;
|
|
...
|
|
... foo (5, args[i], ...)...
|
|
putting the argument into a temporary variable first, as in
|
|
Lisp_Object *args;
|
|
Lisp_Object tem;
|
|
...
|
|
tem = args[i];
|
|
... foo (r, tem, ...)...
|
|
causes the problem to go away.
|
|
The `contents' field of a Lisp vector is an array of Lisp_Objects,
|
|
so you may see the problem happening with indexed references to that.
|
|
|
|
* 68000 C compiler problems
|
|
|
|
Various 68000 compilers have different problems.
|
|
These are some that have been observed.
|
|
|
|
** Using value of assignment expression on union type loses.
|
|
This means that x = y = z; or foo (x = z); does not work
|
|
if x is of type Lisp_Object.
|
|
|
|
** "cannot reclaim" error.
|
|
|
|
This means that an expression is too complicated. You get the correct
|
|
line number in the error message. The code must be rewritten with
|
|
simpler expressions.
|
|
|
|
** XCONS, XSTRING, etc macros produce incorrect code.
|
|
|
|
If temacs fails to run at all, this may be the cause.
|
|
Compile this test program and look at the assembler code:
|
|
|
|
struct foo { char x; unsigned int y : 24; };
|
|
|
|
lose (arg)
|
|
struct foo arg;
|
|
{
|
|
test ((int *) arg.y);
|
|
}
|
|
|
|
If the code is incorrect, your compiler has this problem.
|
|
In the XCONS, etc., macros in lisp.h you must replace (a).u.val with
|
|
((a).u.val + coercedummy) where coercedummy is declared as int.
|
|
|
|
This problem will not happen if the m-...h file for your type
|
|
of machine defines NO_UNION_TYPE. That is the recommended setting now.
|
|
|
|
* C compilers lose on returning unions
|
|
|
|
I hear that some C compilers cannot handle returning a union type.
|
|
Most of the functions in GNU Emacs return type Lisp_Object, which is
|
|
defined as a union on some rare architectures.
|
|
|
|
This problem will not happen if the m-...h file for your type
|
|
of machine defines NO_UNION_TYPE.
|
|
|