add futex_wait_wouldblock test

Test the futex op FUTEX_WAIT for EWOULDBLOCK error code.

Signed-off-by: Gowrishankar <gowrishankar.m@in.ibm.com>
Signed-off-by: Darren Hart <dvhltc@us.ibm.com>
diff --git a/functional/Makefile b/functional/Makefile
index 3c8f5ce..69356fa 100644
--- a/functional/Makefile
+++ b/functional/Makefile
@@ -5,6 +5,7 @@
 HEADERS := ../include/futextest.h
 TARGETS := \
 	futex_wait_timeout \
+	futex_wait_wouldblock \
 	futex_requeue_pi \
 	futex_requeue_pi_signal_restart \
 	futex_requeue_pi_mismatched_ops
diff --git a/functional/futex_wait_wouldblock.c b/functional/futex_wait_wouldblock.c
new file mode 100644
index 0000000..ee70302
--- /dev/null
+++ b/functional/futex_wait_wouldblock.c
@@ -0,0 +1,96 @@
+/******************************************************************************
+ *
+ *   Copyright © International Business Machines  Corp., 2009
+ *
+ *   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 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, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * NAME
+ *      futex_wait_wouldblock.c
+ *
+ * DESCRIPTION
+ *      Test if FUTEX_WAIT op returns -EWOULDBLOCK if the futex value differs
+ *      from the unexpected one.
+ *
+ * AUTHOR
+ *      Gowrishankar <gowrishankar.m@in.ibm.com>
+ *
+ * HISTORY
+ *      2009-Nov-14: Initial version by Gowrishankar <gowrishankar.m@in.ibm.com>
+ *
+ *****************************************************************************/
+
+#include <errno.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include "futextest.h"
+
+#define timeout_ns 100000
+
+void usage(char *prog)
+{
+	printf("Usage: %s\n", prog);
+	printf("  -c	Use color\n");
+	printf("  -h	Display this help message\n");
+	printf("  -v L	Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
+	       VQUIET, VCRITICAL, VINFO);
+}
+
+int main(int argc, char *argv[])
+{
+	struct timespec to = {.tv_sec = 0, .tv_nsec = timeout_ns};
+	futex_t f1 = FUTEX_INITIALIZER;
+	int ret = 0;
+	int c;
+
+	while ((c = getopt(argc, argv, "cht:v:")) != -1) {
+		switch(c) {
+		case 'c':
+			futextest_use_color(1);
+			break;
+		case 'h':
+			usage(basename(argv[0]));
+			exit(0);
+		case 'v':
+			futextest_verbosity(atoi(optarg));
+			break;
+		default:
+			usage(basename(argv[0]));
+			exit(1);
+		}
+	}
+
+	printf("%s: Test the unexpected futex value in FUTEX_WAIT\n",
+	       basename(argv[0]));
+
+	info("Calling futex_wait on f1: %u @ %p with val=%u\n", f1, &f1, f1+1);
+	ret = futex_wait(&f1, f1, &to, FUTEX_PRIVATE_FLAG);
+	if (ret < 0) {
+		ret = -errno;
+		if (ret == -EWOULDBLOCK)
+			ret = 0;
+		else
+			fail("returned error is not '%s' in FUTEX_WAIT, but '%s'\n", \
+			     strerror(EWOULDBLOCK), strerror(errno));
+	} else {
+		fail("futex_wait returned %d\n", ret);
+		ret = -1;
+	}
+
+	printf("Result: %s\n", ret ? FAIL : PASS);
+	return ret;
+}
diff --git a/functional/run.sh b/functional/run.sh
index 01aea59..d377c5f 100755
--- a/functional/run.sh
+++ b/functional/run.sh
@@ -67,3 +67,6 @@
 
 echo 
 ./futex_wait_timeout $COLOR
+
+echo
+./futex_wait_wouldblock $COLOR