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+\documentclass{article}
+\usepackage{axiom}
+\begin{document}
+\title{\$SPAD/src/lib openpty.c}
+\author{The Axiom Team}
+\maketitle
+\begin{abstract}
+\end{abstract}
+\eject
+\tableofcontents
+\eject
+\section{MAC OSX and BSD platform changes}
+Since we have no other information we are adding the [[MACOSXplatform]] variable
+to the list everywhere we find [[LINUXplatform]]. This may not be correct but
+we have no way to know yet. We have also added the [[BSDplatform]] variable.
+MAC OSX is some variant of BSD. These should probably be merged but we
+cannot yet prove that.
+<<mac osx platform change 1>>=
+#if defined(SUN4OS5platform) ||defined(ALPHAplatform) || defined(HP10platform) || defined(LINUXplatform) || defined(MACOSXplatform) || defined(BSDplatform)
+@
+<<mac osx platform change 2>>=
+#if defined(SUNplatform) || defined(HP9platform) || defined(LINUXplatform) || defined(MACOSXplatform) || defined(BSDplatform)
+@
+\section{License}
+<<license>>=
+/*
+Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    - Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    - Redistributions in binary form must reproduce the above copyright
+     notice, this list of conditions and the following disclaimer in
+      the documentation and/or other materials provided with the
+      distribution.
+
+    - Neither the name of The Numerical ALgorithms Group Ltd. nor the
+      names of its contributors may be used to endorse or promote products
+      derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+@
+<<*>>=
+<<license>>
+
+#include "axiom-c-macros.h"
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <string.h>
+
+#if defined(SUN4OS5platform) || defined(HP10platform)
+#include <stropts.h>
+#endif
+
+
+#include "openpty.H1"
+
+
+/*
+ * The main function is ptyopen. It simply opens up both sides of a
+ * pseudo-terminal. It uses and saves the pathnames for
+ * the devices which were actually opened.
+ *
+ * If it fails it simply exits the program.
+ *
+ *
+ * ptyopen(controller, server, controllerPath, serverPath) 
+ * int *controller;     The file descriptor for controller side of the pty 
+ * int *server;         The file descriptor for the server side 
+ * char *controllerPath;  actually , this is not used anywhere on return
+                          and can be taken out of the call sequence
+ * char *serverPath;
+ *
+ * The path name  vars should be declared of size 11 or more
+ */
+
+
+int  
+ptyopen(int *controller,int * server, char *controllerPath,char * serverPath)
+{
+#if defined(SUNplatform) || defined (HP9platform) || defined(RTplatform) ||defined(AIX370platform) || defined(BSDplatform)
+  int looking = 1, i;
+  int oflag = O_RDWR;                  /* flag for opening the pty */
+  
+  for (i = 0; looking && i < 1000; i++) {
+    makeNextPtyNames(controllerPath, serverPath);
+    if (access(controllerPath, 6) != 0) continue;
+    *controller = open(controllerPath, oflag, 0);
+    if (*controller >= 0) {
+      *server = open(serverPath, oflag, 0);
+      if (*server > 0)
+	looking = 0;
+      else
+	close(*controller);
+    }
+  }
+  if (looking) {
+    fprintf(stderr, "Couldn't find a free pty.\n");
+    exit(-1);
+  }
+  return (*controller);
+#endif
+#if defined RIOSplatform
+  int fdm,fds;
+  char *slavename;
+
+  /* open master */
+  if ((fdm=open("/dev/ptc",O_RDWR))<0)
+    perror("ptyopen failed to open /dev/ptc");
+  else {
+    /* get slave name */
+    if((slavename = ttyname(fdm))==0)
+      perror("ptyopen failed to get the slave device name");
+    /* open slave */
+    if ((fds = open(slavename, O_RDWR)) < 0 )
+      perror("ptyopen: Failed to open slave");
+    strcpy(serverPath,slavename);
+    *controller=fdm;
+    *server=fds;
+  }
+  return(fdm);
+#endif
+
+<<mac osx platform change 1>>
+extern int grantpt(int);
+extern int unlockpt(int);
+extern char* ptsname(int);
+  int fdm,fds;
+  char *slavename;
+
+  /* open master */
+  if ((fdm = open("/dev/ptmx", O_RDWR)) < 0 )
+    perror("ptyopen: Failed to open /dev/ptmx");
+  else {
+    /* change permission ofslave */
+    if (grantpt(fdm) < 0)
+      perror("ptyopen: Failed to grant access to slave device");
+    /* unlock slave */
+    if (unlockpt(fdm) < 0)
+      perror("ptyopen: Failed to unlock master/slave pair");
+    /* get name of slave */
+    if ((slavename = ptsname(fdm)) == NULL)
+      perror("ptyopen: Failed to get name of slave device");
+    /* open slave */
+    if ((fds = open(slavename, O_RDWR)) < 0 )
+      perror("ptyopen: Failed to open slave");
+    else {
+#if defined(SUN4OS5platform) || defined(HP10platform)
+      /* push ptem */
+      if (ioctl(fds, I_PUSH, "ptem") < 0)
+        perror("ptyopen: Failed to push ptem");
+      /* push ldterm */
+      if (ioctl(fds, I_PUSH, "ldterm") < 0)
+        perror("ptyopen: Failed to push idterm");
+#endif
+      strcpy(serverPath,slavename);
+      *controller=fdm;
+      *server=fds;
+    }
+  }
+  return(fdm);
+#endif
+#if defined SGIplatform
+  char *fds;
+  fds = _getpty(controller, O_RDWR|O_NDELAY, 0600, 0);
+  strcpy(serverPath,fds);
+  if (0 == serverPath)
+    return(-1);
+  if (0 > (*server = open(serverPath,O_RDWR))) {
+    (void) close(*controller);
+    return(-1);
+  }
+  return (*controller);
+
+#endif
+}
+
+
+void 
+makeNextPtyNames(char *cont,char * serv)
+{
+#ifdef AIX370platform
+	static int channelNo = 0;
+	sprintf(cont, "/dev/ptyp%02x", channelNo);
+	sprintf(serv, "/dev/ttyp%02x", channelNo);
+	channelNo++;
+#endif
+<<mac osx platform change 2>>
+	static int channelNo = 0;
+	static char group[] = "pqrstuvwxyzPQRST";
+	static int groupNo = 0;
+
+	sprintf(cont, "/dev/pty%c%x", group[groupNo], channelNo);
+	sprintf(serv, "/dev/tty%c%x", group[groupNo], channelNo);
+	channelNo++;                /* try next */
+	if (channelNo == 16) {      /* move to new group */
+		channelNo = 0;
+		groupNo++;
+		if (groupNo == 16) groupNo = 0;        /* recycle */
+		}
+#endif
+}
+@
+\eject
+\begin{thebibliography}{99}
+\bibitem{1} nothing
+\end{thebibliography}
+\end{document}