Re: [Caml-list] calling telnet from a caml program

[Nicolas George <nicolas.george@ens.fr>]

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Le sextidi 16 brumaire, an CCXI, Andrei Errapart a écrit :
> If it is possible in C, then it is possible in OCaml, too. Most 
> probably some termios(3) calls are needed, but not much more.

It is More Complicated Than That(tm). On modern Unix, the steps to do
that are:

- master = open(/dev/ptmx)
- grantpt(master)
- unlockpt(master)
- fork
- setsid
- slave = open(ptsname(master))
- ioctl(slave, I_PUSH, "ptem")
- ioctl(slave, I_PUSH, "ldterm")
- ioctl(slave, I_PUSH, "ttcompat")

On BSD, this is more painful, since you must find among /dev/pty*
someone that can be opened, and change ownership of the corresponding
/dev/tty* (so you must be root). The only common step is the
fork/setsid.

There is nothing impossible, but there are horripilating portability
problems here.

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