[erlang-questions] Flush "stdout" buffer

Per Hedeland <>
Fri Sep 1 14:58:44 CEST 2017


On 2017-09-01 13:58, Frank Muller wrote:
> Can someone help on this please?

Well, what is the problem that you want to solve? Erlang doesn't really
have an equivalent to C stdio, and anything you write with io:format/1,2,3
to "standard output" is sent immediately to the OS via a write(2) (or
typically writev(2)) call. Are you seeing something else?  Try this:

erl -noshell -eval 'io:format("foo "),timer:sleep(2000),io:format("bar~n"),timer:sleep(2000),erlang:halt(0)'

--Per

> Thanks
> /Frank
> 
> Le mer. 30 août 2017 at 07:21, Frank Muller < <mailto:>> wrote :
> 
>     Hi Prakash,
> 
>     Thanks, but I doubt it's that easy.
> 
>     In C, you've to call fflush or set the stdout to unbuffer mode.
> 
>     /Frank
> 
>     Le mer. 30 août 2017 à 06:51, Prakash Parmar < <mailto:>> wrote :
> 
>         Hi Frank,
> 
>         As per my experience, Like in C, keeping newline "~n" in io:format will flush it to screen.
> 
>         /Prakash
> 
>         -----Original Message-----
>         From: "Frank Muller" < <mailto:>>
>         Sent: Wednesday, August 30, 2017 9:58am
>         To: "Erlang-Questions Questions" < <mailto:>>
>         Subject: [erlang-questions] Flush "stdout" buffer
> 
>         Hi guys,
>         I'd like to know if there's an equivalent function to C fflush(stdout) ?
>         I've a small Erlang program which prints data to stdout. After every io:format call, I'd like to ensure output is flushed to screen.
>         Thanks in adavance.
>         /Frank
> 
> 
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