A sample to check if a program running on mintty (or some other terminal) on Cygwin/MSYS.

You can use VC6 or later to compile this sample.

If you want to execute the sample on WinXP or if you use VC8 (VC2005) or earlier, you need Win32 FileID API Library (404 now). You need to specify the directory of Win32 FileID API Library with FILEIDAPIDIR:

nmake FILEIDAPIDIR=..\FileIDAPI

If you want to execute the sample on Vista or later and if you use VC9 (VC2008) or later, you don't need Win32 FileID API Library. Just run nmake:

nmake

iscygpty.c has some configurations:

• USE_FILEEXTD: If this is defined, Win32 FileID API Library is linked. This is mandatory if you want to detect Cygwin pty on WinXP. If you want to use this, _WIN32_WINNT should be 0x0501 or lower, otherwise _WIN32_WINNT should be 0x0600 or higher.
• USE_DYNFILEID: If this is defined, GetFileInformationByHandleEx is loaded dynamically (more precisely, explicitly). You can run a program even on WinXP or earlier, but Cygwin pty is not detected on the old OSes when USE_FILEEXTD is not defined.
• ENABLE_STUB_IMPL: If this is defined and USE_FILEEXTD is not defined and when VC2005 or earlier is used, is_cygpty() becomes stub implementation; it always returns 0.

If both USE_FILEEXTD and USE_DYNFILEID are not defined, the program can run only on Vista or later.

Recent versions of Windows support ConPTY and Cygwin/MSYS2 can use it. This allows an application to run as it is in a normal console window. ptycheck doesn't detect when it is run in ConPTY, which is the expected behavior.

To enable or disable ConPTY, you can set the CYGWIN or MSYS environment variable to enable_pcon or disable_pcon before starting mintty. mintty also supports the -P [on|off] or --pcon [on|off] option.

The MIT License. (You can also choose the Vim license.)