Allow std{in,out,err} to be a socket

Allow std{in,out,err} to be a socket

[Søren Gjesse, 2012-03-06 20:01:52]

On 2012/03/06 17:49:50, Dan Rice wrote:

This will work, however please add kSocket to runtime/bin/file.h and
_STDIO_HANDLE_TYPE_SOCKET to runtime/bin/stdio.dart. Look for
_STDIO_HANDLE_TYPE_PIPE in runtime/bin/stdio.dart, and it should be obvious how
to handle _STDIO_HANDLE_TYPE_SOCKET.

- and is there an easy way to add a test?

[Dan Rice, 2012-03-06 20:55:30]

You can test it using the 'socat' command (http://www.dest-unreach.org/socat/),
which has a mode in which it creates a Unix Domain Socket and attaches it to
stdin of an exec()ed process.

$ cat > cat.dart
#import('dart:io');

void main() {
 var stream = new StringInputStream(stdin);
 stream.lineHandler = () {
   var s = stream.readLine();
   if (s != null) {
     print(s);
   }
 };
}

$ socat - EXEC:"dart cat.dart"

output prior to this patch:
Unhandled exception:
FileIOException: Unsupported stdin type
 0. Function: '::_getStdioInputStream@19ffb8b9' url: 'dart:io' line:4612 col:7
 1. Function: '::get:stdin' url: 'dart:io' line:4635 col:34
 2. Function: '::main' url:
'/usr/local/google/users/rice/rice-dart-binary/google3/cat.dart' line:4 col:37

With this patch, whatever you type is echoed correctly.

[Søren Gjesse, 2012-03-06 21:21:26]

lgtm

Thanks for fixing this.

[Dan Rice, 2012-03-06 21:39:23]

r5056