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So how are process exit codes different from shared library return codes different, exactly? What makes it more likely that a stupid user will not check the former but will check the latter? Your argument is valid, but *this bug* is not a good example against processes and pipes
If the bug were due to a weakly typed error message being ignored by default in a client then you'd have a point. But it isn't. The gpg command exits with a big fat retcode 2. That's just as good as a C function returning an error code.
