On May 23 12:49, Andy Koppe wrote:
> The reason is that XWin.exe is built with -Wl,--subsystem,windows (or
> -mwindows, which implies it), which allows it to be invoked directly
> from a shortcut or the Run.. dialog without popping up a console or
> requiring a console hiding hack. (It's the same for mintty.)
>
> The downside is that Windows also won't hook it up to the parent
> process's console, even if there is one, and hence there's nowhere for
> Cygwin to hook the standard file descriptors up to.
>
> Having said that, XP introduced the AttachConsole() function, which
> allows hooking up to the parent's console by pasing
> 'ATTACH_PARENT_PROCESS' as the paremeter.
That doesn't work as expected. I found that GetStdHandle does not
return INVALID_HANDLE_VALUE. Rather, the handle looks like a normal
console handle. Calling GetFileType then returns FILE_TYPE_UNKNOWN
and GetLastError () returns ERROR_INVALID_HANDLE. I used that to
add this code:
Index: dtable.cc
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/dtable.cc,v
retrieving revision 1.221
diff -u -p -r1.221 dtable.cc
--- dtable.cc 5 May 2011 22:30:53 -0000 1.221
+++ dtable.cc 23 May 2011 15:35:49 -0000
@@ -282,7 +282,10 @@ dtable::init_std_file_from_handle (int f
char name[NT_MAX_PATH];
name[0] = '\0';
if (ft == FILE_TYPE_UNKNOWN && GetLastError () == ERROR_INVALID_HANDLE)
- /* can't figure out what this is */;
+ {
+ if (AttachConsole (-1) || GetLastError () == ERROR_ACCESS_DENIED)
+ dev = *console_dev;
+ }
else if (ft == FILE_TYPE_PIPE)
{
int rcv = 0, len = sizeof (int);
In thoery that should attach to the console and open the console
handles for stdin/out/err.
The effect:
- Started from CMD, XWin prints log output to the console.
- Started from bash or tcsh, no output.
- Mintty doesn't start at all.
That doesn't look overly promising. It might be better if XWin itself
tries the AttachConsole/CreateFile("CONOUT$") thingy instead, otherwise
we might end up with some overly complex startup code(*) just for the
benefit of a single application.
Corinna
(*) Insert "which already is overly complex" here.
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat
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