6263984 zlogin's i/o loop can sometimes drop data on child death

[d...@eng.sun.com]

Author: dp
Repository: /hg/onnv/onnv-gate
Revision: 9aa9e2ee0d07f53514c66684ba9887894f43cae8
Log message:
6263984 zlogin's i/o loop can sometimes drop data on child death

Files:
        update: usr/src/cmd/zlogin/zlogin.c