p;-&gt;&nbsp;int
&nbsp;&nbsp;val&nbsp;process_pid&nbsp;:&nbsp;Stdlib.in_channel&nbsp;*&nbsp;Stdlib.out_channel&nbsp;-&gt;&nbsp;int
&nbsp;&nbsp;val&nbsp;process_full_pid&nbsp;:
&nbsp;&nbsp;&nbsp;&nbsp;Stdlib.in_channel&nbsp;*&nbsp;Stdlib.out_channel&nbsp;*&nbsp;Stdlib.in_channel&nbsp;-&gt;&nbsp;int
&nbsp;&nbsp;val&nbsp;close_process_in&nbsp;:&nbsp;Stdlib.in_channel&nbsp;-&gt;&nbsp;UnixLabels.process_status
&nbsp;&nbsp;val&nbsp;close_process_out&nbsp;:&nbsp;Stdlib.out_channel&nbsp;-&gt;&nbsp;UnixLabels.proces