2016-01-01 04:33:14 +00:00
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/* Copyright (C) 2008-2016 Free Software Foundation, Inc.
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Add "../lib/unbuffer_output.c" and use it in gdb.base/interrupt.c
In some scenarios, GDB or GDBserver can be spawned with input _not_
connected to a tty, and then tests that rely on stdio fail with
timeouts, because the inferior's stdout and stderr streams end up
fully buffered.
See discussion here:
https://sourceware.org/ml/gdb-patches/2015-02/msg00809.html
We have a hack in place that works around this for Windows testing,
that forces every test program to link with an .o file that does
(lib/set_unbuffered_mode.c):
static int __gdb_set_unbuffered_output (void) __attribute__ ((constructor));
static int
__gdb_set_unbuffered_output (void)
{
setvbuf (stdout, NULL, _IONBF, BUFSIZ);
setvbuf (stderr, NULL, _IONBF, BUFSIZ);
}
That's a bit hacky; it ends up done for _all_ tests.
This patch adds a way to do this unbuffering explicitly from the test
code itself, so it is done only when necessary, and for all
targets/hosts. For starters, it adjusts gdb.base/interrupt.c to use
it.
Tested on x86_64 Fedora 20, native, and against a remote gdbserver
board file that connects to the target with ssh, with and without -t
(create pty).
gdb/testsuite/
2015-02-27 Pedro Alves <palves@redhat.com>
* lib/unbuffer_output.c: New file.
* gdb.base/interrupt.c: Include "../lib/unbuffer_output.c".
(main): Call gdb_unbuffer_output.
2015-02-27 13:54:22 +00:00
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Force output to unbuffered mode if not connected to a terminal. */
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#include <stdio.h>
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#ifndef __MINGW32__
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#include <unistd.h>
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#endif
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static int
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gdb_unbuffer_output (void)
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{
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/* Always force this for Windows testing. To a native Windows
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program running under a Cygwin shell/ssh, stdin is really a
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Windows pipe, thus not a tty and its outputs ends up fully
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buffered. */
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#ifndef __MINGW32__
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if (!isatty (fileno (stdin)))
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#endif
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{
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setvbuf (stdout, NULL, _IONBF, BUFSIZ);
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setvbuf (stderr, NULL, _IONBF, BUFSIZ);
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}
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}
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