unix: re-open tty stdio fds as /dev/tty?

[bnoordhuis]

The basic logic is as follows, error handling elided for brevity:

for (fd = 0; fd <= 2; fd++) {
  if (isatty(fd))
    dup2(open("/dev/tty", O_RDWR), fd);
}

That lets libuv / node switch its tty to non-blocking mode without affecting other programs that expect it to be in blocking mode. That would, for example, fix the following issue:

$ node | cat
> process
[lots of data]
events.js:68
        throw arguments[1]; // Unhandled 'error' event
                       ^
Error: write EPIPE
    at errnoException (net.js:787:11)
    at Object.afterWrite (net.js:598:19)
    at process._makeCallback (node.js:248:20)

See nodejs/node-v0.x-archive#3027 and this comment in particular.

It remains to be investigated if this approach works on all supported platforms.

[bnoordhuis]

Landed in 31f9fbc.