src/s/dgux4.h

   1 /* Definitions file for GNU Emacs running on Data General's DG/UX
   2    Release 4.10 and above.
   3    Copyright (C) 1996 Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 /* This file was written by Roderick Schertler <roderick@ibcinc.com>,
  22    contact me if you have problems with or comments about running Emacs
  23    on dgux.
  24
  25    A number of things in the older dgux*.h files don't make sense to me,
  26    but since I'm relying on memory and I don't have any older dgux
  27    systems installed on which to test changes I'm undoing or fixing them
  28    here rather than fixing them at the source. */
  29
  30 /* In dgux.h it says "Can't use sys_signal because then etc/server.c
  31    would need sysdep.o." and then it #defines signal() to be
  32    berk_signal(), but emacsserver.c does `#undef signal' anyway, so that
  33    doesn't make sense.
  34
  35    Further, sys_signal() in sysdep.c already had a special case for
  36    #ifdef DGUX, it called berk_signal() explicitly.  I've removed that
  37    special case because it also didn't make sense:  All versions of dgux
  38    which the dgux*.h headers take into account have POSIX signals
  39    (POSIX_SIGNALS is #defined in dgux.h).  The comments in sys_signal()
  40    even acknowledged this (saying that the special berk_signal() case
  41    wasn't really necessary), they said that sys_signal() was using
  42    berk_signal() instead of sigaction() for efficiency.  Since both give
  43    reliable signals neither has to be invoked within the handler.  If
  44    the efficiency that the comments were talking about is the overhead
  45    of setting up the sigaction struct rather than just passing the
  46    function pointer in (which is the only efficiency I can think of)
  47    then that's a needless optimization, the Emacs sources do better
  48    without the special case.
  49
  50    The following definition will prevent dgux.h from re-defining
  51    signal().  I can't just say `#undef signal' after including dgux.h
  52    because signal() is already a macro, defined in <sys/signal.h>, and
  53    the original definition would be lost. */
  54 #define NO_DGUX_SIGNAL_REDEF
  55
  56 #include "dgux5-4r3.h"
  57
  58 #define LIBS_DEBUG /* nothing, -lg doesn't exist */
  59
  60 #ifndef NOT_C_CODE
  61
  62 /* dgux.h defines _setjmp() to be sigsetjmp(), but it defines _longjmp
  63    to be longjmp() rather than siglongjmp().  Further, it doesn't define
  64    jmp_buf, so sigsetjmp() is being called with a jmp_buf rather than a
  65    sigjmp_buf, and the buffer is then passed to vanilla longjmp().  This
  66    provides a more complete emulation of the Berkeley semantics. */
  67
  68 #include <setjmp.h>
  69 #undef jmp_buf
  70 #undef _setjmp
  71 #undef  setjmp
  72 #undef _longjmp
  73 #undef  longjmp
  74 #define jmp_buf         sigjmp_buf
  75 #define _setjmp(env)    sigsetjmp(env, 0)
  76 #define  setjmp(env)    sigsetjmp(env, 1)
  77 #define _longjmp        siglongjmp
  78 #define  longjmp        siglongjmp
  79
  80 /* The BAUD_CONVERT definition in dgux.h is wrong with this version
  81    of dgux, but I'm not sure when it changed.
  82
  83    With the current system Emacs' standard handling of ospeed and
  84    baud_rate don't work.  The baud values (B9600 and so on) returned by
  85    cfgetospeed() aren't compatible with those used by ospeed.  speed_t,
  86    the type returned by cfgetospeed(), is unsigned long and speed_t
  87    values are large.  Further, it isn't possible to get at both the
  88    SysV3 (ospeed) and POSIX (cfgetospeed()) values through symbolic
  89    constants simultaneously because they both use the same names
  90    (B9600).  To get both baud_rate and ospeed right at the same time
  91    it's necessary to hardcode the values for one set of values, here I'm
  92    hardcoding ospeed. */
  93 #undef BAUD_CONVERT
  94 #define INIT_BAUD_RATE()                                        \
  95     struct termios sg;                                          \
  96                                                                 \
  97     tcgetattr (input_fd, &sg);                                  \
  98     switch (cfgetospeed (&sg)) {                                \
  99     case    B50:        baud_rate =    50; ospeed = 0x1; break; \
 100     case    B75:        baud_rate =    75; ospeed = 0x2; break; \
 101     case   B110:        baud_rate =   110; ospeed = 0x3; break; \
 102     case   B134:        baud_rate =   134; ospeed = 0x4; break; \
 103     case   B150:        baud_rate =   150; ospeed = 0x5; break; \
 104     case   B200:        baud_rate =   200; ospeed = 0x6; break; \
 105     case   B300:        baud_rate =   300; ospeed = 0x7; break; \
 106     case   B600:        baud_rate =   600; ospeed = 0x8; break; \
 107     default:                                                    \
 108     case  B1200:        baud_rate =  1200; ospeed = 0x9; break; \
 109     case  B1800:        baud_rate =  1800; ospeed = 0xa; break; \
 110     case  B2400:        baud_rate =  2400; ospeed = 0xb; break; \
 111     case  B4800:        baud_rate =  4800; ospeed = 0xc; break; \
 112     case  B9600:        baud_rate =  9600; ospeed = 0xd; break; \
 113     case B19200:        baud_rate = 19200; ospeed = 0xe; break; \
 114     case B38400:        baud_rate = 38400; ospeed = 0xf; break; \
 115     }                                                           \
 116     return;
 117
 118 /* The `stop on tty output' problem which occurs when using
 119    INTERRUPT_INPUT and when Emacs is invoked under X11 using a job
 120    control shell (csh, ksh, etc.) in the background doesn't look to be
 121    present in R4.11.  (At least, I can't reproduce it using jsh, csh,
 122    ksh or zsh.) */
 123 #undef BROKEN_FIONREAD
 124 #define INTERRUPT_INPUT
 125
 126 /* In R4.11 (or maybe R4.10, I don't have a system with that version
 127    loaded) some of the internal stdio semantics were changed.  One I
 128    found while working on MH is that _cnt has to be 0 before _filbuf()
 129    is called.  Another is that (_ptr - _base) doesn't indicate how many
 130    characters are waiting to be sent.  I can't spot a good way to get
 131    that info from the FILE internals. */
 132 #define PENDING_OUTPUT_COUNT(FILE) (1)
 133
 134 #endif /* NOT_C_CODE */