[Axiom-developer] [#189 Graphics does not work on Debian] See

[Bob McElrath]

Changes 
http://page.axiom-developer.org/zope/mathaction/189GraphicsDoesNotWorkOnDebian/diff
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You must be running on a system which does not have Unix98 pty's.  (e.g.
/dev/ptmx)  As this is by now an old standard, I'm confused why so many
people are running into this problem.  It's included since the 2.1
series of linux kernels.  Could you provide some more information about
your distro/kernel?  Specifically, kernel version, distro version, does
/dev/ptmx exist?  Is devpts mounted?  Does chroot prevent you from using
ptmx due to file premissions?  What/how is your chroot set up?  Is it a
common configuration?  Is it something you did by hand or did you
install some debian package which did it for you?

If machines with this problem are so common, we can fix it by falling
back to the BSD-style pty allocation in src/lib/openpty.c.pamphlet
(patch follows).  Reporter: can you answer the above questions and/or
test the below patch?

--- openpty.c.pamphlet.orig     2005-07-04 14:37:38.000000000 -0700
+++ openpty.c.pamphlet  2005-07-04 14:39:23.000000000 -0700
@@ -177,9 +177,32 @@
       if (ioctl(fds, I_PUSH, "ldterm") < 0)
         perror("ptyopen: Failed to push idterm");
 #endif
+#if defined(LINUXplatform) /* Linux with old-style BSD pty's (not Unix98 
devpts) */
+      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);
+#else
       strcpy(serverPath,slavename);
       *controller=fdm;
       *server=fds;
+#endif
     }
   }
   return(fdm);

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