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X-HELO: calimero.vinschen.de
Date: Tue, 2 Jun 2015 18:50:13 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Cc: Rich Eizenhoefer <riche AT microsoft DOT com>
Subject: Re: From Microsoft: Windows 10 Console and Cygwin
Message-ID: <20150602165013.GE741@calimero.vinschen.de>
Reply-To: cygwin AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com, Rich Eizenhoefer <riche AT microsoft DOT com>
References: <BN3PR03MB14300D5567A2F7D86BB69A28B4D70 AT BN3PR03MB1430 DOT namprd03 DOT prod DOT outlook DOT com> <20150430082231 DOT GB19795 AT calimero DOT vinschen DOT de> <BN3PR03MB1430B88AED4339821C7D95BEB4D50 AT BN3PR03MB1430 DOT namprd03 DOT prod DOT outlook DOT com> <20150502133833 DOT GB12723 AT calimero DOT vinschen DOT de> <BN3PR03MB1430C0816A9D41BB051687A4B4D20 AT BN3PR03MB1430 DOT namprd03 DOT prod DOT outlook DOT com> <1433098286892-118602 DOT post AT n5 DOT nabble DOT com> <20150601082456 DOT GG4308 AT calimero DOT vinschen DOT de> <BN3PR03MB14303BAD46376DED807CFA2CB4B60 AT BN3PR03MB1430 DOT namprd03 DOT prod DOT outlook DOT com> <CAJ1KOAiG-VV2heqYSNSjwCb=s_pjxoxKaGY3SnDiy4E20yvOWw AT mail DOT gmail DOT com> <BN3PR03MB1430F49F8839B66558779F3AB4B50 AT BN3PR03MB1430 DOT namprd03 DOT prod DOT outlook DOT com>
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Hi Rich,

On Jun  2 16:37, Rich Eizenhoefer wrote:
> Can you provide more detail on changing isatty function to support
> Cygwin PTY's? I need to be able to support the request in our backlog.

As I outlined in https://cygwin.com/ml/cygwin/2015-05/msg00029.html,
I'm wondering if the MSVCRT guys would really like to support this,
but if they are willing to consider that, I have a POC implementation
of a MSVCRT isatty replacement implementation I once created for a
customer.  I attached it to this mail.  It's entirely self-written,
free for any usage, no strings attached.  Feel free to use it as you
see fit.


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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Content-Disposition: attachment; filename="isatty-for-native-apps.c"
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#include <stdio.h>
#include <io.h>

#include <errno.h>
#include <wchar.h>
#include <windows.h>
#include <winternl.h>

#ifndef __MINGW64_VERSION_MAJOR
/* MS winternl.h defines FILE_INFORMATION_CLASS, but with only a
   different single member. */
enum FILE_INFORMATION_CLASSX
{
  FileNameInformation =3D 9
};

typedef struct _FILE_NAME_INFORMATION
{
  ULONG FileNameLength;
  WCHAR FileName[1];
} FILE_NAME_INFORMATION, *PFILE_NAME_INFORMATION;

NTSTATUS (NTAPI *pNtQueryInformationFile) (HANDLE, PIO_STATUS_BLOCK, PVOID,
					  ULONG, FILE_INFORMATION_CLASSX);
#else
NTSTATUS (NTAPI *pNtQueryInformationFile) (HANDLE, PIO_STATUS_BLOCK, PVOID,
					  ULONG, FILE_INFORMATION_CLASS);
#endif

int
isatty (int fd)
{
  HANDLE fh;
  NTSTATUS status;
  IO_STATUS_BLOCK io;
  long buf[66];	/* NAME_MAX + 1 + sizeof ULONG */
  PFILE_NAME_INFORMATION pfni =3D (PFILE_NAME_INFORMATION) buf;
  PWCHAR cp;

  /* First check using _isatty.
=20=20
     Note that this returns the wrong result for NUL, for instance!=20
     Workaround is not to use _isatty at all, but rather GetFileType
     plus object name checking. */
  if (_isatty (fd))
    return 1;

  /* Now fetch the underlying HANDLE. */
  fh =3D (HANDLE) _get_osfhandle (fd);
  if (!fh || fh =3D=3D INVALID_HANDLE_VALUE)
    {
      errno =3D EBADF;
      return 0;
    }

  /* Must be a pipe. */
  if (GetFileType (fh) !=3D FILE_TYPE_PIPE)
    goto no_tty;

  /* Calling the native NT function NtQueryInformationFile is required to
     support pre-Vista systems.  If that's of no concern, Vista introduced
     the GetFileInformationByHandleEx call with the FileNameInfo info class,
     which can be used instead. */
  if (!pNtQueryInformationFile)
    {
      pNtQueryInformationFile =3D (NTSTATUS (NTAPI *)(HANDLE, PIO_STATUS_BL=
OCK,
      				PVOID, ULONG, FILE_INFORMATION_CLASS))
			       GetProcAddress (GetModuleHandle ("ntdll.dll"),
					       "NtQueryInformationFile");
      if (!pNtQueryInformationFile)
      	goto no_tty;
    }
  if (!NT_SUCCESS (pNtQueryInformationFile (fh, &io, pfni, sizeof buf,
					   FileNameInformation)))
    goto no_tty;

  /* The filename is not guaranteed to be NUL-terminated. */
  pfni->FileName[pfni->FileNameLength / sizeof (WCHAR)] =3D L'\0';

  /* Now check the name pattern.  The filename of a Cygwin pseudo tty pipe
     looks like this:

       \cygwin-%16llx-pty%d-{to,from}-master
=20=20=20=20=20
     %16llx is the hash of the Cygwin installation, (to support multiple
     parallel installations), %d is the pseudo tty number, "to" or "from"
     differs the pipe direction. "from" is a stdin, "to" a stdout-like
     pipe. */
  cp =3D pfni->FileName;
  if (!wcsncmp (cp, L"\\cygwin-", 8)
      && !wcsncmp (cp + 24, L"-pty", 4))
    {
      cp =3D wcschr (cp + 28, '-');
      if (!cp)
      	goto no_tty;
      if (!wcscmp (cp, L"-from-master") || !wcscmp (cp, L"-to-master"))
      	return 1;
    }
no_tty:
  errno =3D EINVAL;
  return 0;
}

int
main ()
{
  if (isatty(0))
    printf("tty\n");
  else
    printf("not a tty\n");
  return 0;
}

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