tdout:UnixLabels.file_descr&nbsp;-&gt;&nbsp;stderr:UnixLabels.file_descr&nbsp;-&gt;&nbsp;int
&nbsp;&nbsp;val&nbsp;open_process_in&nbsp;:&nbsp;string&nbsp;-&gt;&nbsp;Stdlib.in_channel
&nbsp;&nbsp;val&nbsp;open_process_out&nbsp;:&nbsp;string&nbsp;-&gt;&nbsp;Stdlib.out_channel
&nbsp;&nbsp;val&nbsp;open_process&nbsp;:&nbsp;string&nbsp;-&gt;&nbsp;Stdlib.in_channel&nbsp;*&nbsp;Stdlib.out_channel
&nbsp;&nbsp;val&nbsp;open_process_full&nbsp;:
&nbsp;&nbsp;&nbsp;&nbsp;string&nbsp;-&gt;
&nbsp;&nbsp;&nbsp;&nbsp;env:str