Merge tag 'upstream/libpthread/20090404' into upstream-merged

1 files changed, 86 insertions, 0 deletions

diff --git a/libpthread/tests/test-4.c b/libpthread/tests/test-4.c
new file mode 100644
index 00000000..de9c8fe4
--- /dev/null
+++ b/libpthread/tests/test-4.c
@@ -0,0 +1,86 @@
+/* Test the stack guard.  */
+
+#define _GNU_SOURCE
+
+#include <pthread.h>
+#include <assert.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+
+size_t stacksize;
+
+void *
+thr (void *arg)
+{
+  int i;
+  char *foo;
+
+  foo = alloca (3 * stacksize / 4);
+  for (i = 0; i < sizeof foo; i ++)
+    foo[i] = -1;
+
+  return (void *) 1;
+}
+
+int
+main (int argc, char *argv[])
+{
+  error_t err;
+  pid_t child;
+
+  child = fork ();
+  switch (child)
+    {
+    case -1:
+      error (1, errno, "fork");
+      break;
+
+    case 0:
+      {
+	pthread_attr_t attr;
+	pthread_t tid;
+	void *ret;
+
+	err = pthread_attr_init (&attr);
+	assert_perror (err);
+
+	err = pthread_attr_getstacksize (&attr, &stacksize);
+	assert_perror (err);
+
+	err = pthread_attr_setguardsize (&attr, stacksize / 2);
+	if (err == ENOTSUP)
+	  {
+	    printf ("Stack guard attribute not supported.\n");
+	    return 1;
+	  }
+	assert_perror (err);
+
+	err = pthread_create (&tid, &attr, thr, 0);
+	assert_perror (err);
+
+	err = pthread_attr_destroy (&attr);
+	assert_perror (err);
+
+	err = pthread_join (tid, &ret);
+	/* Should never be successful.  */
+	printf ("Thread did not segfault!?!\n");
+	assert_perror (err);
+	return 0;
+      }
+
+    default:
+      {
+	pid_t pid;
+	int status;
+
+	pid = waitpid (child, &status, 0);
+	printf ("pid = %d; child = %d; status = %d\n", pid, child, status);
+	assert (pid == child);
+	assert (status != 0);
+      }
+    }
+
+  return 0;
+}