popen2, 3, 4 -- will closing all returned streams result in process termination?

[Evgeni Sergeev]

After I opened streams to a process using popen2, popen3 or popen4,
will closing every one of the streams terminate the process?

Is there assurance that the process will terminate and not sit
in memory orphaned, waiting on its stdin, for example?

    Evgeni Sergeev