exec* vs. initially-closed file descriptors in a set-ID context

[Ulrich Drepper]

I've changed the code to use the proposed modes.  There is one 
additional step in the new code: for the writable descriptor 0 we're now 
using /dev/full which causes the operation to fail even if 0 is 
invalidly is used for writing.

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➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖