Christopher Faylor 82b7b4fd4f * child_info.h (child_info_fork::parent_wr_proc_pipe): New element.
* fork.cc (fork_parent): Set parent_wr_proc.
* pinfo.cc (set_myself): Close child_proc_info->parent_wr_proc if it exists
rather than trying to get value from parent _pinfo.
* pinfo.h (enum parent_aleter): New enum.
(pinfo::alert_parent): Declare as returning a value.
(pinfo::parent_alive): New function.
* pinfo.cc (pinfo::alert_parent): Set wr_proc_pipe to invalid non-NULL value
when parent disappears.  Return success of operation.
(proc_waiter): Use __ALERT_* enum for control since these are not really
signals.  Implement __ALERT_ALIVE.
* sigproc.cc (my_parent_is_alive): Eliminate.
* sigproc.h (my_parent_is_alive): Ditto for declaration.
(__SIGREPARENT): Eliminate.
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