view lib/tcgetsid.c @ 40236:e3496deebf30

isatty: Make it return true in Cygwin consoles on native Windows. * lib/isatty.c: Include <string.h>. (GetProcAddress): New macro. (GetNamedPipeClientProcessIdFuncType): New type. (GetNamedPipeClientProcessIdFunc): New variable. (QueryFullProcessImageNameFuncType): New type. (QueryFullProcessImageNameFunc): New variable. (initialized): New variable. (initialize): New function. (IsCygwinConsoleHandle): New function. (isatty): Invoke it. * doc/posix-functions/isatty.texi: Mention the issue.
author Bruno Haible <bruno@clisp.org>
date Thu, 14 Mar 2019 23:54:28 +0100
parents b06060465f09
children
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/* Determine the session ID of the controlling terminal of the current process.
   Copyright (C) 2010-2019 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 2, 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>

#define USE_OLD_TTY /* needed on OpenBSD 4.5, so that TIOCGSID gets defined */

/* Specification.  */
#include <termios.h>

#include <errno.h>
#include <sys/ioctl.h>

pid_t
tcgetsid (int fd)
{
#ifdef TIOCGSID /* Mac OS X, OpenBSD */
  int sid;

  if (ioctl (fd, TIOCGSID, &sid) < 0)
    return -1; /* errno is set here */

  return sid;
#else /* FreeBSD, Cygwin, mingw */
  errno = ENOSYS;
  return -1;
#endif
}