🚀 go-pugleaf

In GNU Emacs 18.55.31 of Sat Dec  8 1990 on satyr (usg-unix-v)

The solution to the subprocess bug I was encountering lay in FIONREAD.
The ESIX implementation of the FIONREAD ioctl is broken. It does not
work on pipes or ptys.

The emacs sources contain reference to BROKEN_FIONREAD, a define that
is settable by the m-*.h or s-*.h files that undefines FIONREAD.
Unfortunately, BROKEN_FIONREAD is only setup in dispnew.c and
keyboard.c and x11term.c.

Here are the diffs to make emacs-18.55 work correctly on ESIX.

*** dist-18.55/src/ChangeLog	Fri Aug 18 15:02:45 1989
--- ChangeLog	Sat Dec  8 14:43:46 1990
***************
*** 1,3 ****
--- 1,10 ----
+ Sat Dec  8 14:41:32 1990  Kayvan Sylvan  (kayvan at satyr.UUCP)
+ 
+ 	* Added s-esix5-3.h. Changes to m-intel386.h for ESIX.
+ 
+ 	* Added BROKEN_FIONREAD section to process.c and sysdep.c,
+ 	plus xterm.c for completion.
+ 
  Fri Aug 18 17:00:47 1989  Richard Stallman  (rms at hobbes.ai.mit.edu)
  
  	* Version 18.55 released.
*** dist-18.55/src/m-intel386.h	Tue Jul 25 22:40:58 1989
--- m-intel386.h	Mon Dec  3 20:50:47 1990
***************
*** 124,135 ****
  #else /* not XENIX */
  
  #ifdef USG
  #define LIB_STANDARD -lPW -lc
  #define HAVE_ALLOCA
  #define NO_REMAP 
  #define TEXT_START 0
  #endif /* USG */
! #endif /* not XENIX */
  
  #ifdef BSD
  #define HAVE_ALLOCA
--- 124,139 ----
  #else /* not XENIX */
  
  #ifdef USG
+ #ifdef ESIX
+ #define LIB_STANDARD -lPW -lc -lbsd
+ #else /* not ESIX */
  #define LIB_STANDARD -lPW -lc
+ #endif /* ESIX */
  #define HAVE_ALLOCA
  #define NO_REMAP 
  #define TEXT_START 0
  #endif /* USG */
! #endif /* not ESIX */
  
  #ifdef BSD
  #define HAVE_ALLOCA
*** dist-18.55/src/process.c	Sun Aug  6 15:01:31 1989
--- process.c	Sat Dec  8 14:24:28 1990
***************
*** 63,71 ****
  
  #else /* not IRIS, not UNIPLUS */
  #ifdef HAVE_TIMEVAL
! #if defined(USG) && !defined(IBMRTAIX)
  #include <time.h>
! #else /* IBMRTAIX or not USG */
  #include <sys/time.h>
  #endif /* IBMRTAIX or not USG */
  #endif /* HAVE_TIMEVAL */
--- 63,71 ----
  
  #else /* not IRIS, not UNIPLUS */
  #ifdef HAVE_TIMEVAL
! #if defined(USG) && !defined(IBMRTAIX) && !defined(ESIX)
  #include <time.h>
! #else /* IBMRTAIX or ESIX or not USG */
  #include <sys/time.h>
  #endif /* IBMRTAIX or not USG */
  #endif /* HAVE_TIMEVAL */
***************
*** 139,144 ****
--- 139,150 ----
  #endif
  #endif /* BSD or UNIPLUS or STRIDE */
  #endif /* no WAITTYPE */
+ 
+ /* Allow m- file to inhibit use of FIONREAD.  */
+ #ifdef BROKEN_FIONREAD
+ #undef FIONREAD
+ #undef SIGIO
+ #endif
  
  extern errno;
  extern sys_nerr;
*** dist-18.55/src/sysdep.c	Mon Aug  7 18:50:43 1989
--- sysdep.c	Sat Dec  8 14:23:54 1990
***************
*** 127,132 ****
--- 127,136 ----
  #ifdef XENIX
  #undef TIOCGETC  /* Avoid confusing some conditionals that test this.  */
  #endif
+ #ifdef ESIX
+ #undef TIOCGETC  /* Avoid confusing some conditionals that test this.  */
+ #undef TIOCGWINSZ
+ #endif
  
  #ifndef HAVE_TERMIO
  #ifndef VMS
***************
*** 150,156 ****
  /* Some USG systems with TIOCGWINSZ need this file; some don't have it.
     We don't know how to distinguish them.
     If this #include gets an error, just delete it.  */
! #include <sys/sioctl.h>
  #endif
  #endif
  #endif
--- 154,160 ----
  /* Some USG systems with TIOCGWINSZ need this file; some don't have it.
     We don't know how to distinguish them.
     If this #include gets an error, just delete it.  */
! /*#include <sys/sioctl.h>*/
  #endif
  #endif
  #endif
***************
*** 194,199 ****
--- 198,209 ----
  #endif /* not SIGCHLD */
  #endif /* SIGCLD */
  #endif /* not VMS */
+ 
+ /* Allow m- file to inhibit use of FIONREAD.  */
+ #ifdef BROKEN_FIONREAD
+ #undef FIONREAD
+ #undef SIGIO
+ #endif
  
  static int baud_convert[] =
  #ifdef BAUD_CONVERT
*** dist-18.55/src/xterm.c	Wed Dec 28 20:09:23 1988
--- xterm.c	Sat Dec  8 14:25:45 1990
***************
*** 80,85 ****
--- 80,91 ----
  #define X_DEFAULT_FONT "vtsingle"
  #endif
  
+ /* Allow m- file to inhibit use of FIONREAD.  */
+ #ifdef BROKEN_FIONREAD
+ #undef FIONREAD
+ #undef SIGIO
+ #endif
+ 
  #define min(a,b) ((a)<(b) ? (a) : (b))
  #define max(a,b) ((a)>(b) ? (a) : (b))
  #define sigunblockx(sig) sigblock (0)
*** /dev/null	Mon Jun 11 15:57:26 1990
--- s-esix5-3.h	Sat Dec  8 14:18:10 1990
***************
*** 0 ****
--- 1,212 ----
+ /* Definitions file for GNU Emacs running on AT&T's System V Release 3
+    Copyright (C) 1987 Free Software Foundation, Inc.
+ 
+ This file is part of GNU Emacs.
+ 
+ GNU Emacs is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY.  No author or distributor
+ accepts responsibility to anyone for the consequences of using it
+ or for whether it serves any particular purpose or works at all,
+ unless he says so in writing.  Refer to the GNU Emacs General Public
+ License for full details.
+ 
+ Everyone is granted permission to copy, modify and redistribute
+ GNU Emacs, but only under the conditions described in the
+ GNU Emacs General Public License.   A copy of this license is
+ supposed to have been given to you along with GNU Emacs so you
+ can know your rights and responsibilities.  It should be in a
+ file named COPYING.  Among other things, the copyright notice
+ and this notice must be preserved on all copies.  */
+ 
+ 
+ /*
+  *	Define symbols to identify the version of Unix this is.
+  *	Define all the symbols that apply correctly.
+  */
+ 
+ #define ESIX
+ #define USG				/* System III, System V, etc */
+ 
+ #define USG5
+ 
+ /* SYSTEM_TYPE should indicate the kind of system you are using.
+  It sets the Lisp variable system-type.  */
+ 
+ #define SYSTEM_TYPE "usg-unix-v"
+ 
+ /* nomultiplejobs should be defined if your system's shell
+  does not have "job control" (the ability to stop a program,
+  run some other program, then continue the first one).  */
+ 
+ #define NOMULTIPLEJOBS
+ 
+ /* Default is to set interrupt_input to 0: don't do input buffering within Emacs */
+ 
+ /* #define INTERRUPT_INPUT */
+ 
+ /* Letter to use in finding device name of first pty,
+   if system supports pty's.  'p' means it is /dev/ptyp0  */
+ 
+ #define FIRST_PTY_LETTER 'p'
+ 
+ /*
+  *	Define HAVE_TERMIO if the system provides sysV-style ioctls
+  *	for terminal control.
+  */
+ 
+ #define HAVE_TERMIO
+ 
+ /*
+  *	Define HAVE_TIMEVAL if the system supports the BSD style clock values.
+  *	Look in <sys/time.h> for a timeval structure.
+  */
+ 
+ #define HAVE_TIMEVAL
+ #define MISSING_UTIMES 
+ 
+ /*
+  *	Define HAVE_SELECT if the system supports the `select' system call.
+  */
+ 
+ /* #define HAVE_SELECT */
+ 
+ /*
+  *	Define HAVE_PTYS if the system supports pty devices.
+  */
+ 
+ /* Some versions of V.3 have this, but not all. ESIX does. */
+ #define HAVE_PTYS
+ #define SYSV_PTYS
+ 
+ /* Define HAVE_SOCKETS if system supports 4.2-compatible sockets.  */
+ 
+ /* #define HAVE_SOCKETS */
+ 
+ /*
+  *	Define NONSYSTEM_DIR_LIBRARY to make Emacs emulate
+  *      The 4.2 opendir, etc., library functions.
+  */
+ 
+ /* #define NONSYSTEM_DIR_LIBRARY */
+ 
+ /*
+  * 	Define SYSV_SYSTEM_DIR to use the V.3 getdents/readir
+  *	library functions.  Almost, but not quite the same as
+  *	the 4.2 functions
+  */
+ #define SYSV_SYSTEM_DIR
+ 
+ /* Define this symbol if your system has the functions bcopy, etc. */
+ 
+ /* #define BSTRING */
+ 
+ /* subprocesses should be defined if you want to
+  have code for asynchronous subprocesses
+  (as used in M-x compile and M-x shell).
+  This is supposed to work now on system V release 2.  */
+ 
+ #define subprocesses
+ 
+ /* If your system uses COFF (Common Object File Format) then define the
+    preprocessor symbol "COFF". */
+ 
+ #define COFF
+ 
+ /* define MAIL_USE_FLOCK if the mailer uses flock
+    to interlock access to /usr/spool/mail/$USER.
+    The alternative is that a lock file named
+    /usr/spool/mail/$USER.lock.  */
+ 
+ /* #define MAIL_USE_FLOCK */
+ 
+ /* Define CLASH_DETECTION if you want lock files to be written
+    so that Emacs can tell instantly when you try to modify
+    a file that someone else has modified in his Emacs.  */
+ 
+ /* #define CLASH_DETECTION */
+ 
+ /* Define SHORTNAMES if the C compiler can distinguish only
+    short names.  It means that the stuff in ../shortnames
+    must be run to convert the long names to short ones.  */
+ 
+ /* #define SHORTNAMES */
+ 
+ /* We use the Berkeley (and usg5.2.2) interface to nlist.  */
+ 
+ #define NLIST_STRUCT
+ 
+ /* The file containing the kernel's symbol table is called /unix.  */
+ 
+ #define KERNEL_FILE "/unix"
+ 
+ /* The symbol in the kernel where the load average is found
+    is named avenrun.  */
+ 
+ #define LDAV_SYMBOL "avenrun"
+ 
+ /* Define this if system V IPC is available.  */
+ 
+ #define HAVE_SYSVIPC
+ 
+ /* Special hacks needed to make Emacs run on this system.  */
+ 
+ /*
+  *	Make the sigsetmask function go away.  Don't know what the
+  *	ramifications of this are, but doesn't seem possible to
+  *	emulate it properly anyway at this point.
+  */
+ 
+ /*#define sigsetmask(mask)	/* Null expansion */
+ 
+ /* setjmp and longjmp can safely replace _setjmp and _longjmp,
+    but they will run slower.  */
+ 
+ #define _setjmp setjmp
+ #define _longjmp longjmp
+ 
+ /* On USG systems the system calls are interruptable by signals
+  that the user program has elected to catch.  Thus the system call
+  must be retried in these cases.  To handle this without massive
+  changes in the source code, we remap the standard system call names
+  to names for our own functions in sysdep.c that do the system call
+  with retries. */
+ 
+ #define read sys_read
+ #define write sys_write
+ #define open sys_open
+ #define close sys_close
+ 
+ #define INTERRUPTABLE_OPEN
+ #define INTERRUPTABLE_CLOSE
+ #define INTERRUPTABLE_IO
+ 
+ /* On USG systems these have different names */
+ 
+ #define index strchr
+ #define rindex strrchr
+ 
+ /* USG systems tend to put everything declared static
+    into the initialized data area, which becomes pure after dumping Emacs.
+    Foil this.  Emacs carefully avoids static vars inside functions.  */
+ 
+ #define static
+ 
+ /* Compiler bug bites on many systems when default ADDR_CORRECT is used.  */
+ 
+ #define ADDR_CORRECT(x) (x)
+ 
+ /* Prevent -lg from being used for debugging.  Not implemented?  */
+ 
+ #define LIBS_DEBUG -lg
+ 
+ /* Use terminfo instead of termcap.  */
+ 
+ #define TERMINFO
+ 
+ /* X needs to talk on the network, so search the network library.  */
+ 
+ #define LIBX10_SYSTEM -lnsl_s
+ #define LIBX11_SYSTEM -lnsl_s
+ 
+ /* ESIX has FIONREAD, but it doesn't work right on the ptys or pipes */
+ #define BROKEN_FIONREAD