Execute daemon, shell process about vimproc.vim

[ujihisa]

which step did it fail, and what was the error message?

[joelmo]

I don't get any error message, I try to see if I can have the stdin open so I can write to a process and read its output when i need to from/to (stdin/out), in this example It only works if I also use sub.stdin.close():

let sub = vimproc#popen2('tail')
call sub.stdin.write('foo')
" must use close to flush foo to tail?
call sub.stdin.close()
call sub.stdin.write('at another time')
let res = ''
let runs = 10
while runs
    let runs -= 1
  let res .= sub.stdout.read()
endwhile
echo res

[k-takata]

let sub = vimproc#system_bg('sh')
call sub.stdin.write('echo hi')

This should be:

let sub = vimproc#popen2('sh')
call sub.stdin.write("echo hi\n")