+------------------------+----------------------+
| Parent                 | Child                |
+------------------------+----------------------+
| - open3(...);          |                      |
| - <OUT>                | - ...                |   |
|   - Waits for child to | - print STDERR 1027; |   |
|     write to STDOUT or | - print STDERR 1028; |   |
|     for child to end.  | - print STDERR 1029; |   T
|                        | - print STDERR 1030; |   i
|                        | - print STDERR 1031; |   m
|                        |   - Pipe full.       |   e
|                        |     Waits for parent |   |
|                        |     to empty it.     |   |
|                        |                      |   v
| Still waiting...       | Still waiting...     |
+------------------------+----------------------+