binutils-gdb/gdb/testsuite/lib/read1.c
Pedro Alves 2a31c6236d Integrate PR 12649's race detector directly in the testsuite machinery
This integrates Jan Kratochvil's nice race reproducer from PR
testsuite/12649 into the testsuite infrustructure directly.

With this, one only has to do either 'make check-read1' or 'make check
READ1="1"' to preload the read1.so library into expect.

Currently only enabled for glibc/GNU systems, and if
build==host==target.

gdb/testsuite/ChangeLog:

	* Makefile.in (EXTRA_RULES, CC): New variables, get from
	configure.
	(EXPECT): Handle READ1 being set.
	(all): Depend on EXTRA_RULES.
	(check-read1, expect-read1, read1.so, read1): New rules.
	* README (Testsuite Parameters): Document the READ1 make variable.
	(Race detection): New section.
	* configure: Regenerate.
	* configure.ac: If build==host==target, and running under a
	GNU/glibc system, add read1 to the extra Makefile rules.
	(EXTRA_RULES): AC_SUBST it.
	* lib/read1.c: New file.

gdb/ChangeLog:

	* Makefile.in (check-read1): New rule.
2014-08-20 18:55:54 +01:00

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C

/* This is part of GDB, the GNU debugger.
Copyright 2011-2014 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 <http://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE 1
#include <dlfcn.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
/* Wrap 'read', forcing it to return only one byte at a time, if
reading from the terminal. */
ssize_t
read (int fd, void *buf, size_t count)
{
static ssize_t (*read2) (int fd, void *buf, size_t count) = NULL;
if (read2 == NULL)
{
unsetenv ("LD_PRELOAD");
read2 = dlsym (RTLD_NEXT, "read");
}
if (count > 1 && isatty (fd) >= 1)
count = 1;
return read2 (fd, buf, count);
}