gdb/testsuite/lib/unbuffer_output.c

   1 /* Copyright (C) 2008-2021 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 /* Force output to unbuffered mode if not connected to a terminal.  */
  19
  20 #include <stdio.h>
  21 #ifndef __MINGW32__
  22 #include <unistd.h>
  23 #endif
  24
  25 static void
  26 gdb_unbuffer_output (void)
  27 {
  28   /* Always force this for Windows testing.  To a native Windows
  29      program running under a Cygwin shell/ssh, stdin is really a
  30      Windows pipe, thus not a tty and its outputs ends up fully
  31      buffered.  */
  32 #ifndef __MINGW32__
  33   if (!isatty (fileno (stdin)))
  34 #endif
  35     {
  36       setvbuf (stdout, NULL, _IONBF, BUFSIZ);
  37       setvbuf (stderr, NULL, _IONBF, BUFSIZ);
  38     }
  39 }