1 files changed, 49 insertions, 0 deletions
diff --git a/c/src/exec/libcsupport/src/dup2.c b/c/src/exec/libcsupport/src/dup2.c
new file mode 100644
index 0000000000..5653425708
--- /dev/null
+++ b/c/src/exec/libcsupport/src/dup2.c
@@ -0,0 +1,49 @@
+/*
+ *  dup2() - POSIX 1003.1b 6.2.1 Duplicate an Open File Descriptor
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#include <unistd.h>
+#include <fcntl.h>
+
+#include "libio_.h"
+
+int dup2(
+  int fildes,
+  int fildes2
+)
+{
+  int          status;
+  struct stat  buf;
+
+  /*
+   *  If fildes is not valid, then fildes2 should not be closed.
+   */
+
+  status = fstat( fildes, &buf );
+  if ( status == -1 )
+    return -1;
+
+  /*
+   *  If fildes2 is not valid, then we should not do anything either.
+   */
+
+  status = fstat( fildes2, &buf );
+  if ( status == -1 )
+    return -1;
+
+  /*
+   *  This fcntl handles everything else.
+   */
+  
+  return fcntl( fildes, F_DUPFD, fildes2 );
+}