From 9fb465b60da98040bbc8ee649f17cfb6dbe3f293 Mon Sep 17 00:00:00 2001
From: Christoph Reiter <reiter.christoph@gmail.com>
Date: Thu, 17 Jun 2021 18:52:14 +0530
Subject: [PATCH 072/N] cygpty isatty
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Co-authored-by: Алексей <alexey.pawlow@gmail.com>
---
 Include/iscygpty.h    |  41 ++++++++++
 Makefile.pre.in       |   2 +
 Modules/_io/fileio.c  |   3 +-
 Modules/main.c        |   3 +-
 Modules/posixmodule.c |   3 +-
 Objects/fileobject.c  |   3 +-
 Python/bltinmodule.c  |   5 +-
 Python/fileutils.c    |   3 +-
 Python/frozenmain.c   |   3 +-
 Python/iscygpty.c     | 185 ++++++++++++++++++++++++++++++++++++++++++
 Python/pylifecycle.c  |   3 +-
 11 files changed, 245 insertions(+), 9 deletions(-)
 create mode 100644 Include/iscygpty.h
 create mode 100644 Python/iscygpty.c

diff --git a/Include/iscygpty.h b/Include/iscygpty.h
new file mode 100644
index 0000000..82fd0af
--- /dev/null
+++ b/Include/iscygpty.h
@@ -0,0 +1,41 @@
+/*
+ * iscygpty.h -- part of ptycheck
+ * https://github.com/k-takata/ptycheck
+ *
+ * Copyright (c) 2015-2017 K.Takata
+ *
+ * You can redistribute it and/or modify it under the terms of either
+ * the MIT license (as described below) or the Vim license.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _ISCYGPTY_H
+#define _ISCYGPTY_H
+
+#ifdef _WIN32
+int is_cygpty(int fd);
+int is_cygpty_used(void);
+#else
+#define is_cygpty(fd)		0
+#define is_cygpty_used()	0
+#endif
+
+#endif /* _ISCYGPTY_H */
diff --git a/Makefile.pre.in b/Makefile.pre.in
index f6d0247..126131c 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -372,6 +372,7 @@ PYTHON_OBJS=	\
 		Python/import.o \
 		Python/importdl.o \
 		Python/initconfig.o \
+		Python/iscygpty.o \
 		Python/marshal.o \
 		Python/modsupport.o \
 		Python/mysnprintf.o \
@@ -1070,6 +1071,7 @@ PYTHON_HEADERS= \
 		$(srcdir)/Include/import.h \
 		$(srcdir)/Include/interpreteridobject.h \
 		$(srcdir)/Include/intrcheck.h \
+		$(srcdir)/Include/iscygpty.h \
 		$(srcdir)/Include/iterobject.h \
 		$(srcdir)/Include/listobject.h \
 		$(srcdir)/Include/longintrepr.h \
diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index 048484b..0b56118 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -19,6 +19,7 @@
 #endif
 #include <stddef.h> /* For offsetof */
 #include "_iomodule.h"
+#include "iscygpty.h"
 
 /*
  * Known likely problems:
@@ -1128,7 +1129,7 @@ _io_FileIO_isatty_impl(fileio *self)
         return err_closed();
     Py_BEGIN_ALLOW_THREADS
     _Py_BEGIN_SUPPRESS_IPH
-    res = isatty(self->fd);
+    res = isatty(self->fd) || is_cygpty(self->fd);
     _Py_END_SUPPRESS_IPH
     Py_END_ALLOW_THREADS
     return PyBool_FromLong(res);
diff --git a/Modules/main.c b/Modules/main.c
index 2cc891f..17469e3 100644
--- a/Modules/main.c
+++ b/Modules/main.c
@@ -6,6 +6,7 @@
 #include "pycore_pathconfig.h"    // _PyPathConfig_ComputeSysPath0()
 #include "pycore_pylifecycle.h"   // _Py_PreInitializeFromPyArgv()
 #include "pycore_pystate.h"       // _PyInterpreterState_GET()
+#include "iscygpty.h"
 
 /* Includes for exit_sigint() */
 #include <stdio.h>                // perror()
@@ -91,7 +92,7 @@ static inline int config_run_code(const PyConfig *config)
 static int
 stdin_is_interactive(const PyConfig *config)
 {
-    return (isatty(fileno(stdin)) || config->interactive);
+    return (isatty(fileno(stdin)) || config->interactive || is_cygpty(fileno(stdin)));
 }
 
 
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 40fc270..bb1b81d 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -36,6 +36,7 @@
 #ifdef __ANDROID__
 #  undef HAVE_FACCESSAT
 #endif
+#include "iscygpty.h"
 
 #include <stdio.h>  /* needed for ctermid() */
 
@@ -10082,7 +10083,7 @@ os_isatty_impl(PyObject *module, int fd)
 {
     int return_value;
     _Py_BEGIN_SUPPRESS_IPH
-    return_value = isatty(fd);
+    return_value = isatty(fd) || is_cygpty(fd);
     _Py_END_SUPPRESS_IPH
     return return_value;
 }
diff --git a/Objects/fileobject.c b/Objects/fileobject.c
index 1c6ecaf..afddc4f 100644
--- a/Objects/fileobject.c
+++ b/Objects/fileobject.c
@@ -2,6 +2,7 @@
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
+#include "iscygpty.h"
 #include "pycore_runtime.h"  // _PyRuntime
 
 #if defined(HAVE_GETC_UNLOCKED) && !defined(_Py_MEMORY_SANITIZER)
@@ -435,7 +436,7 @@ stdprinter_isatty(PyStdPrinter_Object *self, PyObject *Py_UNUSED(ignored))
     }
 
     Py_BEGIN_ALLOW_THREADS
-    res = isatty(self->fd);
+    res = isatty(self->fd) || is_cygpty(self->fd);
     Py_END_ALLOW_THREADS
 
     return PyBool_FromLong(res);
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 614012d..d29d06d 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -1,6 +1,7 @@
 /* Built-in functions */
 
 #include "Python.h"
+#include "iscygpty.h"
 #include <ctype.h>
 #include "ast.h"
 #undef Yield   /* undefine macro conflicting with <winbase.h> */
@@ -1980,7 +1981,7 @@ builtin_input_impl(PyObject *module, PyObject *prompt)
         Py_DECREF(tmp);
         if (fd < 0 && PyErr_Occurred())
             return NULL;
-        tty = fd == fileno(stdin) && isatty(fd);
+        tty = fd == fileno(stdin) && (isatty(fd) || is_cygpty(fd));
     }
     if (tty) {
         tmp = _PyObject_CallMethodIdNoArgs(fout, &PyId_fileno);
@@ -1993,7 +1994,7 @@ builtin_input_impl(PyObject *module, PyObject *prompt)
             Py_DECREF(tmp);
             if (fd < 0 && PyErr_Occurred())
                 return NULL;
-            tty = fd == fileno(stdout) && isatty(fd);
+            tty = fd == fileno(stdout) && (isatty(fd) || is_cygpty(fd));
         }
     }
 
diff --git a/Python/fileutils.c b/Python/fileutils.c
index d5f8b79..a47f12b 100644
--- a/Python/fileutils.c
+++ b/Python/fileutils.c
@@ -1,4 +1,5 @@
 #include "Python.h"
+#include "iscygpty.h"
 #include "pycore_fileutils.h"
 #include "osdefs.h"               // SEP
 #include <locale.h>
@@ -70,7 +71,7 @@ _Py_device_encoding(int fd)
 #endif
     int valid;
     _Py_BEGIN_SUPPRESS_IPH
-    valid = isatty(fd);
+    valid = isatty(fd) || is_cygpty(fd);
     _Py_END_SUPPRESS_IPH
     if (!valid)
         Py_RETURN_NONE;
diff --git a/Python/frozenmain.c b/Python/frozenmain.c
index dd04d60..6607762 100644
--- a/Python/frozenmain.c
+++ b/Python/frozenmain.c
@@ -4,6 +4,7 @@
 #include "Python.h"
 #include "pycore_runtime.h"  // _PyRuntime_Initialize()
 #include <locale.h>
+#include "iscygpty.h"
 
 #ifdef MS_WINDOWS
 extern void PyWinFreeze_ExeInit(void);
@@ -107,7 +108,7 @@ Py_FrozenMain(int argc, char **argv)
     else
         sts = 0;
 
-    if (inspect && isatty((int)fileno(stdin)))
+    if (inspect && (isatty((int)fileno(stdin)) || is_cygpty((int)fileno(stdin))))
         sts = PyRun_AnyFile(stdin, "<stdin>") != 0;
 
 #ifdef MS_WINDOWS
diff --git a/Python/iscygpty.c b/Python/iscygpty.c
new file mode 100644
index 0000000..722f88f
--- /dev/null
+++ b/Python/iscygpty.c
@@ -0,0 +1,185 @@
+/*
+ * iscygpty.c -- part of ptycheck
+ * https://github.com/k-takata/ptycheck
+ *
+ * Copyright (c) 2015-2017 K.Takata
+ *
+ * You can redistribute it and/or modify it under the terms of either
+ * the MIT license (as described below) or the Vim license.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifdef _WIN32
+
+#include <ctype.h>
+#include <io.h>
+#include <wchar.h>
+#include <windows.h>
+
+#ifdef USE_FILEEXTD
+/* VC 7.1 or earlier doesn't support SAL. */
+# if !defined(_MSC_VER) || (_MSC_VER < 1400)
+#  define __out
+#  define __in
+#  define __in_opt
+# endif
+/* Win32 FileID API Library:
+ * http://www.microsoft.com/en-us/download/details.aspx?id=22599
+ * Needed for WinXP. */
+# include <fileextd.h>
+#else /* USE_FILEEXTD */
+/* VC 8 or earlier. */
+# if defined(_MSC_VER) && (_MSC_VER < 1500)
+#  ifdef ENABLE_STUB_IMPL
+#   define STUB_IMPL
+#  else
+#   error "Win32 FileID API Library is required for VC2005 or earlier."
+#  endif
+# endif
+#endif /* USE_FILEEXTD */
+
+
+#include "iscygpty.h"
+
+//#define USE_DYNFILEID
+#ifdef USE_DYNFILEID
+typedef BOOL (WINAPI *pfnGetFileInformationByHandleEx)(
+		HANDLE                    hFile,
+		FILE_INFO_BY_HANDLE_CLASS FileInformationClass,
+		LPVOID                    lpFileInformation,
+		DWORD                     dwBufferSize
+);
+static pfnGetFileInformationByHandleEx pGetFileInformationByHandleEx = NULL;
+
+# ifndef USE_FILEEXTD
+static BOOL WINAPI stub_GetFileInformationByHandleEx(
+		HANDLE                    hFile,
+		FILE_INFO_BY_HANDLE_CLASS FileInformationClass,
+		LPVOID                    lpFileInformation,
+		DWORD                     dwBufferSize
+		)
+{
+	return FALSE;
+}
+# endif
+
+static void setup_fileid_api(void)
+{
+	if (pGetFileInformationByHandleEx != NULL) {
+		return;
+	}
+	pGetFileInformationByHandleEx = (pfnGetFileInformationByHandleEx)
+		GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")),
+				"GetFileInformationByHandleEx");
+	if (pGetFileInformationByHandleEx == NULL) {
+# ifdef USE_FILEEXTD
+		pGetFileInformationByHandleEx = GetFileInformationByHandleEx;
+# else
+		pGetFileInformationByHandleEx = stub_GetFileInformationByHandleEx;
+# endif
+	}
+}
+#else
+# define pGetFileInformationByHandleEx	GetFileInformationByHandleEx
+# define setup_fileid_api()
+#endif
+
+
+#define is_wprefix(s, prefix) \
+	(wcsncmp((s), (prefix), sizeof(prefix) / sizeof(WCHAR) - 1) == 0)
+
+/* Check if the fd is a cygwin/msys's pty. */
+int is_cygpty(int fd)
+{
+#ifdef STUB_IMPL
+	return 0;
+#else
+	HANDLE h;
+	int size = sizeof(FILE_NAME_INFO) + sizeof(WCHAR) * (MAX_PATH - 1);
+	FILE_NAME_INFO *nameinfo;
+	WCHAR *p = NULL;
+
+	setup_fileid_api();
+
+	h = (HANDLE) _get_osfhandle(fd);
+	if (h == INVALID_HANDLE_VALUE) {
+		return 0;
+	}
+	/* Cygwin/msys's pty is a pipe. */
+	if (GetFileType(h) != FILE_TYPE_PIPE) {
+		return 0;
+	}
+	nameinfo = malloc(size + sizeof(WCHAR));
+	if (nameinfo == NULL) {
+		return 0;
+	}
+	/* Check the name of the pipe:
+	 * '\{cygwin,msys}-XXXXXXXXXXXXXXXX-ptyN-{from,to}-master' */
+	if (pGetFileInformationByHandleEx(h, FileNameInfo, nameinfo, size)) {
+		nameinfo->FileName[nameinfo->FileNameLength / sizeof(WCHAR)] = L'\0';
+		p = nameinfo->FileName;
+		if (is_wprefix(p, L"\\cygwin-")) {		/* Cygwin */
+			p += 8;
+		} else if (is_wprefix(p, L"\\msys-")) {	/* MSYS and MSYS2 */
+			p += 6;
+		} else {
+			p = NULL;
+		}
+		if (p != NULL) {
+			while (*p && isxdigit(*p))	/* Skip 16-digit hexadecimal. */
+				++p;
+			if (is_wprefix(p, L"-pty")) {
+				p += 4;
+			} else {
+				p = NULL;
+			}
+		}
+		if (p != NULL) {
+			while (*p && isdigit(*p))	/* Skip pty number. */
+				++p;
+			if (is_wprefix(p, L"-from-master")) {
+				//p += 12;
+			} else if (is_wprefix(p, L"-to-master")) {
+				//p += 10;
+			} else {
+				p = NULL;
+			}
+		}
+	}
+	free(nameinfo);
+	return (p != NULL);
+#endif /* STUB_IMPL */
+}
+
+/* Check if at least one cygwin/msys pty is used. */
+int is_cygpty_used(void)
+{
+	int fd, ret = 0;
+
+	for (fd = 0; fd < 3; fd++) {
+		ret |= is_cygpty(fd);
+	}
+	return ret;
+}
+
+#endif /* _WIN32 */
+
+/* vim: set ts=4 sw=4: */
diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index 60f091c..734084c 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -19,6 +19,7 @@
 #include "pycore_traceback.h"     // _Py_DumpTracebackThreads()
 
 #include "grammar.h"              // PyGrammar_RemoveAccelerators()
+#include "iscygpty.h"
 #include <locale.h>               // setlocale()
 
 #ifdef HAVE_SIGNAL_H
@@ -2470,7 +2471,7 @@ _Py_RestoreSignals(void)
 int
 Py_FdIsInteractive(FILE *fp, const char *filename)
 {
-    if (isatty((int)fileno(fp)))
+    if (isatty((int)fileno(fp)) || is_cygpty((int)fileno(fp)))
         return 1;
     if (!Py_InteractiveFlag)
         return 0;
-- 
2.32.0