/* 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
# include <windows.h>
#endif
-#if REPLACE_DUP2
+#if HAVE_DUP2
# undef dup2
/* 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. */
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 */