[Caml-list] reading from socket connection

[Caml-list] reading from socket connection

[Christian.Schaller]

Hi,

When connecting, let's say to a nntp server and just exchanging some
information, the OCaml manual tells me to use open_connection from the Unix
library.  This works well, however, how can I read the output from the
remote server?  My first try was a readLines function (see below) to read
until EOF, however there's no EOF, thus my program hanging.  Any hints?  Is
this a cygwin related problem?

Thanks,
  Chris

open Unix

let server = inet_addr_of_string "10.10.10.10"
let sockaddr = ADDR_INET (server, 119)

let readLines ch =
  try
    while true do
      print_endline (input_line ch)
    done
  with End_of_file -> ();;

let client_fun ic oc =
  output_string oc "help\n";
  flush oc;
  readLines ic

let _ = 
  let ic, oc = open_connection sockaddr in
  client_fun ic oc;
  shutdown_connection ic

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Re: [Caml-list] reading from socket connection

[Xavier Leroy]

> When connecting, let's say to a nntp server and just exchanging some
> information, the OCaml manual tells me to use open_connection from the Unix
> library.  This works well, however, how can I read the output from the
> remote server?  My first try was a readLines function (see below) to read
> until EOF, however there's no EOF, thus my program hanging.  Any
> hints?

One hint: most servers, including NNTP servers, wait until the client
shuts down its half of the network connection before they shut down
their half of the connection, thus giving an EOF condition to the
client.

So, you need to shutdown the connection before attempting to read till EOF.

- Xavier Leroy

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