X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fdup2.c;h=ef581a7efd2c8cdad84323b8737a907ea3fccf60;hb=ab43907148e80f3895280928c05d4be93875580f;hp=fb3ffb0df07b386a634139b3256b7e0b1e2d095d;hpb=eeee74f5efe5e3c9f8f1198478b719921f29242c;p=gnulib.git

diff --git a/lib/dup2.c b/lib/dup2.c
index fb3ffb0df..ef581a7ef 100644
--- a/lib/dup2.c
+++ b/lib/dup2.c
@@ -1,7 +1,6 @@
 /* Duplicate an open file descriptor to a specified file descriptor.
 
-   Copyright (C) 1999, 2004, 2005, 2006, 2007, 2009 Free Software
-   Foundation, Inc.
+   Copyright (C) 1999, 2004-2007, 2009-2010 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -32,7 +31,7 @@
 # include <windows.h>
 #endif
 
-#if REPLACE_DUP2
+#if HAVE_DUP2
 
 # undef dup2
 
@@ -70,10 +69,14 @@ rpl_dup2 (int fd, int desired_fd)
   /* Correct a cygwin 1.5.x errno value.  */
   else if (result == -1 && errno == EMFILE)
     errno = EBADF;
+# if REPLACE_FCHDIR
+  if (fd != desired_fd && result != -1)
+    result = _gl_register_dup (fd, result);
+# endif
   return result;
 }
 
-#else /* !REPLACE_DUP2 */
+#else /* !HAVE_DUP2 */
 
 /* On older platforms, dup2 did not exist.  */
 
@@ -98,13 +101,21 @@ dupfd (int fd, int desired_fd)
 int
 dup2 (int fd, int desired_fd)
 {
-  if (fd == desired_fd)
-    return fd;
+  int result = fcntl (fd, F_GETFL) < 0 ? -1 : fd;
+  if (result == -1 || fd == desired_fd)
+    return result;
   close (desired_fd);
 # ifdef F_DUPFD
-  return fcntl (fd, F_DUPFD, desired_fd);
+  result = fcntl (fd, F_DUPFD, desired_fd);
+#  if REPLACE_FCHDIR
+  if (0 <= result)
+    result = _gl_register_dup (fd, result);
+#  endif
 # else
-  return dupfd (fd, desired_fd);
+  result = dupfd (fd, desired_fd);
 # endif
+  if (result == -1 && (errno == EMFILE || errno == EINVAL))
+    errno = EBADF;
+  return result;
 }
-#endif /* !REPLACE_DUP2 */
+#endif /* !HAVE_DUP2 */