Albert Cahalan wrote: > Marcus Leech writes: > > >> I experimentally put some code just before the execvpe() in >> inject.py to close FDs >= 3 and <= 10. I picked 10 out of >> the air, but I wouldn't expect there to be many open file >> descriptors at that point. Actually, given the semantics of dup(), >> you could use it to probe what the maximum FD number is just before >> execvpe(), so the terminating condition could be something >> like <= dup(0). >> > > I don't see how dup() would help you. Remember, you could get > back fd 123 even if fd 12345 was the last one allocated and is > still in use. You get the lowest free fd. > > You can do readdir() on /proc/self/fd to list them, being > careful to not close the fd used for reading the directory > until you have read the whole directory. > > Yes, you're quite right. Late-night fuzzy thinking on my part.
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