bug in strip 2.9.4

Mumit Khan khan@xraylith.wisc.edu
Sun Feb 28 00:01:00 GMT 1999


On Sat, 27 Feb 1999, Pierre A. Humblet wrote:

> strip 2.9.4 in Binutils-2.9 has a bug when stripping a file accessed through a link, on systems that open files by default in text mode (such as cygwin).
> The new executable file has an incorrect length.
> 
> I believe the bug occurs in the file binutils/objcopy.c, in the function 
> simple_copy. The open() and creat() below will open in text mode and the
> copy won't be properly executed for binary files.
> 
>   fromfd = open (from, O_RDONLY);
>   if (fromfd < 0)
>     return -1;
>   tofd = creat (to, 0777);
> 

Good catch. We could do something like the following:
  
  int flags = O_RDONLY;
#ifdef O_BINARY
  flags |= O_BINARY;
#endif
  fromfd = open (from, flags);
  if (fromfd < 0)
    return -1;
  tofd = creat (to, 0777);

As you note, we also need to handle the descriptor returned by creat 
(which is somewhat equiv to open'ing with a few flags -- O_CREAT | 
O_TRUNC | O_WRONLY).

How about just using setmode on both the descriptors? Would that work?

  fromfd = open (from, O_RDONLY);
  if (fromfd < 0)
    return -1;
  tofd = creat (to, 0777);
#if _WIN32
  setmode (fromfd, O_BINARY);
  setmode (tofd, O_BINARY);
#endif

Regards,
Mumit



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