[PATCH] Fix nptl/tst-setuid3.c

[Paul E. Murphy]

pthread_barrier_wait can return either PTHREAD_BARRIER_SERIAL_THREAD
or 0.  Posix makes no guarantees about which thread return the unique
value.

Additionally, pthread_join was not called despite seemingly checking
for the error.

2016-01-19  Paul E. Murphy  <murphyp@linux.vnet.ibm.com>

	* nptl/tst-setuid3.c (INVALID_BARRIER_WAIT): New macro.
	(do_test): Use macro to simplify checking barrier exit
	code, and actually join the child thread.
---
 nptl/tst-setuid3.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/nptl/tst-setuid3.c b/nptl/tst-setuid3.c
index e017934..69667d8 100644
--- a/nptl/tst-setuid3.c
+++ b/nptl/tst-setuid3.c
@@ -33,14 +33,18 @@ static pthread_barrier_t barrier2;
 #define FAIL_ERR(fmt, ...) \
   do { printf ("FAIL: " fmt ": %m\n", __VA_ARGS__); _exit (1); } while (0)
 
+/* True if pthread_barrier_wait returns without an error.  */
+#define INVALID_BARRIER_WAIT(x) ((x != 0) && \
+				 (x != PTHREAD_BARRIER_SERIAL_THREAD))
+
 static void *
 thread_func (void *ctx __attribute__ ((unused)))
 {
   int ret = pthread_barrier_wait (&barrier1);
-  if (ret != PTHREAD_BARRIER_SERIAL_THREAD && ret != 0)
+  if (INVALID_BARRIER_WAIT (ret))
     FAIL ("pthread_barrier_wait (barrier1) (on thread): %d", ret);
   ret = pthread_barrier_wait (&barrier2);
-  if (ret != PTHREAD_BARRIER_SERIAL_THREAD && ret != 0)
+  if (INVALID_BARRIER_WAIT (ret))
     FAIL ("pthread_barrier_wait (barrier2) (on thread): %d", ret);
   return NULL;
 }
@@ -86,7 +90,7 @@ do_test (void)
 
   /* Ensure that the thread is running properly.  */
   ret = pthread_barrier_wait (&barrier1);
-  if (ret != 0)
+  if (INVALID_BARRIER_WAIT (ret))
     FAIL ("pthread_barrier_wait (barrier1): %d", ret);
 
   setuid_failure (2);
@@ -97,10 +101,11 @@ do_test (void)
 
   /* Shutdown.  */
   ret = pthread_barrier_wait (&barrier2);
-  if (ret != PTHREAD_BARRIER_SERIAL_THREAD && ret != 0)
+  if (INVALID_BARRIER_WAIT (ret))
     FAIL ("pthread_barrier_wait (barrier2): %d", ret);
 
-  if (ret != PTHREAD_BARRIER_SERIAL_THREAD && ret != 0)
+  ret = pthread_join (thread, NULL);
+  if (ret != 0)
     FAIL ("pthread_join: %d", ret);
 
   return 0;
-- 
2.4.3