+/* Definitions file for GNU Emacs running on RTU 3.0, ucb universe.
+ Copyright (C) 1986 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+
+/*
+ * Define symbols to identify the version of Unix this is.
+ * Define all the symbols that apply correctly.
+ */
+
+#define BSD4_2
+#define BSD
+#define RTU
+
+/* SYSTEM_TYPE should indicate the kind of system you are using.
+ It sets the Lisp variable system-type. */
+
+#define SYSTEM_TYPE "rtu"
+
+/* 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
+
+/* Emacs can read input using SIGIO and buffering characters itself,
+ or using CBREAK mode and making C-g cause SIGINT.
+ The choice is controlled by the variable interrupt_input.
+ Define INTERRUPT_INPUT to make interrupt_input = 1 the default (use SIGIO)
+
+ SIGIO can be used only on systems that implement it (4.2 and 4.3).
+ CBREAK mode has two disadvatages
+ 1) At least in 4.2, it is impossible to handle the Meta key properly.
+ I hear that in system V this problem does not exist.
+ 2) Control-G causes output to be discarded.
+ I do not know whether this can be fixed in system V.
+
+ Another method of doing input is planned but not implemented.
+ It would have Emacs fork off a separate process
+ to read the input and send it to the true Emacs process
+ through a pipe.
+*/
+
+#undef INTERRUPT_INPUT
+
+/* Letter to use in finding device name of first pty,
+ if system supports pty's. 'a' means it is /dev/ptya0 */
+
+#define FIRST_PTY_LETTER 'z' /* i.e. no PTY_LETTERs */
+
+/*
+ * 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 HAVE_SELECT if the system supports the `select' system call.
+ */
+
+#define HAVE_SELECT
+
+/*
+ * Define HAVE_PTYS if the system supports pty devices.
+ */
+
+#define HAVE_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 this symbol if your system has the functions bcopy, etc. */
+/* The system library bcopy() is broken in RTU. For one thing, it expects
+ the length to be less than 64k. */
+#undef 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 generally OS dependent, and not supported
+ under most USG systems. */
+
+#define subprocesses
+
+/* If your system uses COFF (Common Object File Format) then define the
+ preprocessor symbol "COFF". */
+
+#undef 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. */
+
+#undef 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. */
+
+#undef CLASH_DETECTION
+
+/* We use the Berkeley (and usg5.2.2) interface to nlist. */
+
+#define NLIST_STRUCT
+
+/* The symbol in the kernel where the load average is found
+ is named _avenrun. */
+
+#define LDAV_SYMBOL "_avenrun"
+\f
+/* Special hacks needed to make Emacs run on this system. */
+
+/* On RTU systems (like USG) 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 open sys_open
+#define write sys_write
+
+#define INTERRUPTABLE_OPEN
+#define INTERRUPTABLE_IO
+
+/* The "fsync" call on RTU versions 3.0 and 3.1 is badly broken!
+ This hack below isn't the best solution, but without it this
+ program will cause the whole system to hang! !@#$#%$ Masscomp! */
+
+#define fsync(x) 0 /* "Comment out" fsync calls */
+
+/* RTU has IPC instead of Unix-domain sockets. */
+
+#define HAVE_SYSVIPC
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