diff --git a/libguile/ChangeLog b/libguile/ChangeLog
index e08e98456..d9e6b7be8 100644
--- a/libguile/ChangeLog
+++ b/libguile/ChangeLog
@@ -1,5 +1,11 @@
 Sun Jul 20 03:55:49 1997  Gary Houston  <ghouston@actrix.gen.nz>
 
+	* filesys.c (scm_close): oops, don't call SCM_INUM twice on the
+	argument.
+
+	* ioext.h: new prototypes.
+	* ioext.c (scm_primitive_dup, scm_primitive_dup2): new procedures.
+
 	* fluids.c (next_fluid_num): don't do
 	SCM_THREAD_CRITICAL_SECTION_START/END unless USE_THREADS is defined.
 
diff --git a/libguile/filesys.c b/libguile/filesys.c
index f9d4c4070..b2b13244a 100644
--- a/libguile/filesys.c
+++ b/libguile/filesys.c
@@ -274,7 +274,7 @@ scm_close (SCM fd_or_port)
   fd = SCM_INUM (fd_or_port);
   SCM_DEFER_INTS;
   scm_evict_ports (fd);		/* see scsh manual.  */
-  SCM_SYSCALL (rv = close (SCM_INUM (fd)));
+  SCM_SYSCALL (rv = close (fd));
   /* following scsh, closing an already closed file descriptor is
      not an error.  */
   if (rv < 0 && errno != EBADF)
diff --git a/libguile/ioext.c b/libguile/ioext.c
index 0f094f349..ae2f5903b 100644
--- a/libguile/ioext.c
+++ b/libguile/ioext.c
@@ -307,6 +307,58 @@ scm_redirect_port (old, new)
   return SCM_UNSPECIFIED;
 }
 
+SCM_PROC (s_primitive_dup, "primitive-dup", 1, 0, 0, scm_primitive_dup);
+SCM 
+scm_primitive_dup (SCM fd_or_port)
+{
+  int fd, newfd;
+
+  SCM_DEFER_INTS;
+  if (SCM_INUMP (fd_or_port))
+    fd = SCM_INUM (fd_or_port);
+  else
+    {
+      SCM_ASSERT (SCM_NIMP (fd_or_port) && SCM_OPPORTP (fd_or_port),
+		  fd_or_port, SCM_ARG1, s_primitive_dup);
+      fd = fileno ((FILE *)SCM_STREAM (fd_or_port));
+      if (fd == -1)
+	scm_syserror (s_primitive_dup);
+    }
+  SCM_SYSCALL (newfd = dup (fd));
+  if (newfd == -1)
+    scm_syserror (s_primitive_dup);
+  SCM_ALLOW_INTS;
+  return SCM_MAKINUM (newfd);
+}
+
+SCM_PROC (s_primitive_dup2, "primitive-dup2", 2, 0, 0, scm_primitive_dup2);
+SCM 
+scm_primitive_dup2 (SCM fd_or_port, SCM fd)
+{
+  int oldfd, newfd, rv;
+
+  SCM_DEFER_INTS;
+  if (SCM_INUMP (fd_or_port))
+    oldfd = SCM_INUM (fd_or_port);
+  else
+    {
+      SCM_ASSERT (SCM_NIMP (fd_or_port) && SCM_OPPORTP (fd_or_port),
+		  fd_or_port, SCM_ARG1, s_primitive_dup2);
+      oldfd = fileno ((FILE *)SCM_STREAM (fd_or_port));
+      if (oldfd == -1)
+	scm_syserror (s_primitive_dup2);
+    }
+  
+  SCM_ASSERT (SCM_INUMP (newfd), newfd, SCM_ARG2, s_primitive_dup2);
+  newfd = SCM_INUM (fd);
+  scm_evict_ports (newfd);	/* see scsh manual.  */
+  SCM_SYSCALL (rv = dup2 (oldfd, newfd));
+  if (rv == -1)
+    scm_syserror (s_primitive_dup2);
+  SCM_ALLOW_INTS;
+  return SCM_UNSPECIFIED;
+}
+
 SCM_PROC (s_fileno, "fileno", 1, 0, 0, scm_fileno);
 
 SCM 
diff --git a/libguile/ioext.h b/libguile/ioext.h
index 194c74a23..5e8302427 100644
--- a/libguile/ioext.h
+++ b/libguile/ioext.h
@@ -55,6 +55,8 @@ extern SCM scm_fseek SCM_P ((SCM port, SCM offset, SCM whence));
 extern SCM scm_freopen SCM_P ((SCM filename, SCM modes, SCM port));
 extern SCM scm_duplicate_port SCM_P ((SCM oldpt, SCM modes));
 extern SCM scm_redirect_port SCM_P ((SCM into_pt, SCM from_pt));
+extern SCM scm_primitive_dup (SCM fd_or_port);
+extern SCM scm_primitive_dup2 (SCM fd_or_port, SCM newfd);
 extern SCM scm_fileno SCM_P ((SCM port));
 extern SCM scm_isatty_p SCM_P ((SCM port));
 extern SCM scm_fdopen SCM_P ((SCM fdes, SCM modes));