Use libnss_files.so for tests posix/bug-ga2 and resolv/tst-leaks2 [BZ #26821]

The tests posix/bug-ga2-mem and resolv/mtrace-tst-leaks2 are failing on
fedora 33 as mtrace reports memory leaks.

The /etc/nsswitch.conf differs between
Fedora 32: hosts:      files dns myhostname
Fedora 33: hosts:      files resolve [!UNAVAIL=return] myhostname dns

Therefore /lib64/libnss_resolve.so.2 (from systemd) and the dependencies
libgcc_s.so.1 and libpthread.so.0 are loaded.

Usually all malloc'ed resources from getaddrinfo / gethostbyname are freed
and the libraries are dlclose'd in nss/nsswitch.c:libc_freeres_fn (free_mem).
Unfortunately, /lib64/libnss_resolve.so.2 is marked with DF_1_NODELETE.
As this library is not unmapped, you'll see "Memory not freed".

Therefore those tests are now only relying on libnss_files.so by making
them test-container tests and providing the required configuration files.

By moving the tests to tests-container, those are now running with
"make check".  Therefore the mtrace part of the tests are also moved
from "make xcheck" to "make check".

bug-ga2.c is now using test-driver.c in order to support WAIT_FOR_DEBUGGER
environment variable.

1 files changed, 7 insertions, 6 deletions

diff --git a/posix/bug-ga2.c b/posix/bug-ga2.c
index 5ea759b8ce..712e40de48 100644
--- a/posix/bug-ga2.c
+++ b/posix/bug-ga2.c
@@ -3,9 +3,10 @@
 #include <netdb.h>
 #include <stdio.h>
 #include <string.h>
+#include <support/check.h>
 
-int
-main (void)
+static int
+do_test (void)
 {
   struct addrinfo hints, *res;
   int i, ret;
@@ -20,11 +21,11 @@ main (void)
       ret = getaddrinfo ("www.gnu.org", "http", &hints, &res);
 
       if (ret)
-	{
-	  printf ("%s\n", gai_strerror (ret));
-	  return 1;
-	}
+	FAIL_EXIT1 ("%s\n", gai_strerror (ret));
+
       freeaddrinfo (res);
     }
   return 0;
 }
+
+#include <support/test-driver.c>