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* the index of an struct hvc_iucv_private instance.
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* This routine notifies the HVC back-end that a tty hangup (carrier loss,
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* The z/VM IUCV HVC device driver ignores virtual hangups (vhangup())
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* to keep an existing IUCV communication path established.
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* (Background: vhangup() is called from user space (by getty or login) to