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From: Nicholas N. <nj...@cs...> - 2006-08-14 00:54:29
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On Sun, 13 Aug 2006, Paul Pluzhnikov wrote:
> Nigel Horne wrote:
>
>> Since file descriptors are being tracked, it would be useful to warn of
>> closing files that aren't open, perhaps --warn-close-fds=yes
>
> You don't need something as advanced as VG for this.
> Simple "strace -etrace=close ./a.out 2>&1 | grep EBADF" will do.
>
> Note however, that it is somewhat common UNIX practice to
> close FDs that aren't open, and you are likely to encounter
> such code in various libraries (it's often easier to just
> close FD again, rather than keep track of whether it's
> currently open or not).
Yes, many programs do something not much more sophisticated than this:
for (i = 0; i < BIG_NUMBER; i++)
close(i);
Nick
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