support: Introduce new subdirectory for test infrastructure

The new test driver in <support/test-driver.c> has feature parity with
the old one.  The main difference is that its hooking mechanism is
based on functions and function pointers instead of macros.  This
commit also implements a new environment variable, TEST_COREDUMPS,
which disables the code which disables coredumps (that is, it enables
them if the invocation environment has not disabled them).

<test-skeleton.c> defines wrapper functions so that it is possible to
use existing macros with the new-style hook functionality.

This commit changes only a few test cases to the new test driver, to
make sure that it works as expected.

1 files changed, 3 insertions, 4 deletions

diff --git a/io/tst-open-tmpfile.c b/io/tst-open-tmpfile.c
index 9242d62392..23fa819c3c 100644
--- a/io/tst-open-tmpfile.c
+++ b/io/tst-open-tmpfile.c
@@ -28,10 +28,7 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
-static int do_test (void);
-
-#define TEST_FUNCTION do_test ()
-#include "../test-skeleton.c"
+#include <support/support.h>
 
 #ifdef O_TMPFILE
 typedef int (*wrapper_func) (const char *, int, mode_t);
@@ -317,3 +314,5 @@ do_test (void)
 }
 
 #endif  /* O_TMPFILE */
+
+#include <support/test-driver.c>