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/* isatty() replacement.
Copyright (C) 2012-2020 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <unistd.h>
/* This replacement is enabled on native Windows. */
#include <errno.h>
#include <string.h>
/* Get declarations of the Win32 API functions. */
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#if HAVE_MSVC_INVALID_PARAMETER_HANDLER
# include "msvc-inval.h"
#endif
/* Get _get_osfhandle(). */
#if GNULIB_MSVC_NOTHROW
# include "msvc-nothrow.h"
#else
# include <io.h>
#endif
/* Avoid warnings from gcc -Wcast-function-type. */
#define GetProcAddress \
(void *) GetProcAddress
/* GetNamedPipeClientProcessId was introduced only in Windows Vista. */
typedef BOOL (WINAPI * GetNamedPipeClientProcessIdFuncType) (HANDLE hPipe,
PULONG pClientProcessId);
static GetNamedPipeClientProcessIdFuncType GetNamedPipeClientProcessIdFunc = NULL;
/* QueryFullProcessImageName was introduced only in Windows Vista. */
typedef BOOL (WINAPI * QueryFullProcessImageNameFuncType) (HANDLE hProcess,
DWORD dwFlags,
LPSTR lpExeName,
PDWORD pdwSize);
static QueryFullProcessImageNameFuncType QueryFullProcessImageNameFunc = NULL;
static BOOL initialized = FALSE;
static void
initialize (void)
{
HMODULE kernel32 = LoadLibrary ("kernel32.dll");
if (kernel32 != NULL)
{
GetNamedPipeClientProcessIdFunc =
(GetNamedPipeClientProcessIdFuncType) GetProcAddress (kernel32, "GetNamedPipeClientProcessId");
QueryFullProcessImageNameFunc =
(QueryFullProcessImageNameFuncType) GetProcAddress (kernel32, "QueryFullProcessImageNameA");
}
initialized = TRUE;
}
static BOOL IsConsoleHandle (HANDLE h)
{
DWORD mode;
/* GetConsoleMode
<https://docs.microsoft.com/en-us/windows/console/getconsolemode> */
return GetConsoleMode (h, &mode) != 0;
}
static BOOL IsCygwinConsoleHandle (HANDLE h)
{
/* A handle to a Cygwin console is in fact a named pipe whose client process
and server process is <CYGWIN_INSTALL_DIR>\bin\mintty.exe. */
BOOL result = FALSE;
ULONG processId;
if (!initialized)
initialize ();
/* GetNamedPipeClientProcessId
<https://docs.microsoft.com/en-us/windows/desktop/api/winbase/nf-winbase-getnamedpipeclientprocessid>
It requires -D_WIN32_WINNT=_WIN32_WINNT_VISTA or higher. */
if (GetNamedPipeClientProcessIdFunc && QueryFullProcessImageNameFunc
&& GetNamedPipeClientProcessIdFunc (h, &processId))
{
/* OpenProcess
<https://docs.microsoft.com/en-us/windows/desktop/api/processthreadsapi/nf-processthreadsapi-openprocess> */
HANDLE processHandle =
OpenProcess (PROCESS_QUERY_LIMITED_INFORMATION, FALSE, processId);
if (processHandle != NULL)
{
char buf[1024];
DWORD bufsize = sizeof (buf);
/* The file name can be determined through
GetProcessImageFileName
<https://docs.microsoft.com/en-us/windows/desktop/api/psapi/nf-psapi-getprocessimagefilenamea>
or
QueryFullProcessImageName
<https://docs.microsoft.com/en-us/windows/desktop/api/winbase/nf-winbase-queryfullprocessimagenamea>
The former returns a file name in non-standard notation (it starts
with '\Device\') and may require linking with psapi.dll.
The latter is better, but requires -D_WIN32_WINNT=_WIN32_WINNT_VISTA
or higher. */
if (QueryFullProcessImageNameFunc (processHandle, 0, buf, &bufsize))
{
if (strlen (buf) >= 11
&& strcmp (buf + strlen (buf) - 11, "\\mintty.exe") == 0)
result = TRUE;
}
CloseHandle (processHandle);
}
}
return result;
}
#if HAVE_MSVC_INVALID_PARAMETER_HANDLER
static int
_isatty_nothrow (int fd)
{
int result;
TRY_MSVC_INVAL
{
result = _isatty (fd);
}
CATCH_MSVC_INVAL
{
result = 0;
}
DONE_MSVC_INVAL;
return result;
}
#else
# define _isatty_nothrow _isatty
#endif
/* Determine whether FD refers to a console device. Return 1 if yes.
Return 0 and set errno if no. (ptsname_r relies on the errno value.) */
int
isatty (int fd)
{
HANDLE h = (HANDLE) _get_osfhandle (fd);
if (h == INVALID_HANDLE_VALUE)
{
errno = EBADF;
return 0;
}
/* _isatty (fd) tests whether GetFileType of the handle is FILE_TYPE_CHAR.
But it does not set errno when it returns 0. */
if (_isatty_nothrow (fd))
{
if (IsConsoleHandle (h))
return 1;
}
if (IsCygwinConsoleHandle (h))
return 1;
errno = ENOTTY;
return 0;
}
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