extras: Introduce new subdirectory for test infrastructure

2016-11-25  Florian Weimer  <fweimer@redhat.com>

	New subdirectory extras for build and test infrastructure.
	* Makeconfig (link-extra-libs-tests): Define.
	(+link-pie-tests, +link-static-tests, +link-tests): Use
	link-extra-libs-tests.
	(rpath-dirs, all-subdirs): Add extras.
	(built-modules): Add libextras.
	(libextras): Define.
	* extras: New directory.
	* extras/Makefile, extras/check.c, extras/chech.h,
	extras/extras.h, extras/ignore_stderr.c, extras/oom_error.c,
	extras/set_fortify_handler.c, extras/temp_file-internal.h,
	exteras/temp_file.c, extras_tempfile.h, extras/test-skeleton.c,
	extras_testmain.c, extras/test_main.h, extras/write_message.c,
	extras/xasprintf.c, extras/xcalloc.c, extras/xmalloc.c,
	extras/xrealloc.c: New files.
	* test-skeleton.c: Include <extras/extras.h>.
	(_FAIL, FAIL_RET, FAIL_EXIT, FAIL_EXIT1): Remove.  Now in
	extras/check.h.
	(oom_error, xmalloc, xcalloc, xrealloc, xasprintf, write_message)
	(ignore_stderr, set_fortify_handler): Remove.  Now in
	extras/extras.h.
	* dlfcn/Makefile (bug-atexit3-lib.so): Link with $(libextras).
	* dlfcn/bug-atexit3-lib.cc: Include <extras/extras.h>.
	(write_message): Remove.
	* io/test-open-tmpfile: Use new test skeleton.
	* io/tst-posix_fallocate-common.c: Likewise.
	* malloc/tst-malloc-backtrace.c: Likewise.
	* nptl/tst-cleanup0.c: Likewise.
	* posix/tst-posix_fadvise-common.c: Likewise.
	* sysdeps/unix/sysv/linux/tst-fallocate-common.c: Likewise.
	* sysdeps/unix/sysv/linux/tst-sync_file_range.c: Likewise.

diff --git a/Makeconfig b/Makeconfig
index a785860..c429917 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -394,6 +394,9 @@ ifndef after-link
 after-link =
 endif
 
+# Additional libraries to link into every test.
+link-extra-libs-tests = $(libextras)
+
 # Command for linking PIE programs with the C library.
 ifndef +link-pie
 +link-pie-before-libc = $(CC) -pie -Wl,-O1 -nostdlib -nostartfiles -o $@ \
@@ -412,8 +415,8 @@ $(+link-pie-before-libc) $(rtld-LDFLAGS) $(link-libc) $(+link-pie-after-libc)
 $(call after-link,$@)
 endef
 define +link-pie-tests
-$(+link-pie-before-libc) $(rtld-tests-LDFLAGS) $(link-libc-tests) \
-			 $(+link-pie-after-libc)
+$(+link-pie-before-libc) $(link-extra-libs-tests) \
+  $(rtld-tests-LDFLAGS) $(link-libc-tests) $(+link-pie-after-libc)
 $(call after-link,$@)
 endef
 endif
@@ -434,7 +437,8 @@ $(+link-static-before-libc) $(link-libc-static) $(+link-static-after-libc)
 $(call after-link,$@)
 endef
 define +link-static-tests
-$(+link-static-before-libc) $(link-libc-static-tests) $(+link-static-after-libc)
+$(+link-static-before-libc) $(link-extra-libs-tests) \
+  $(link-libc-static-tests) $(+link-static-after-libc)
 $(call after-link,$@)
 endef
 endif
@@ -462,8 +466,8 @@ $(+link-before-libc) $(rtld-LDFLAGS) $(link-libc) $(+link-after-libc)
 $(call after-link,$@)
 endef
 define +link-tests
-$(+link-before-libc) $(rtld-tests-LDFLAGS) $(link-libc-tests) \
-		     $(+link-after-libc)
+$(+link-before-libc) $(link-extra-libs-tests) \
+  $(link-libc-tests) $(+link-after-libc)
 $(call after-link,$@)
 endef
 endif
@@ -503,7 +507,7 @@ link-libc = $(link-libc-rpath-link) $(link-libc-before-gnulib) $(gnulib)
 link-libc-tests = $(link-libc-tests-rpath-link) \
 		  $(link-libc-before-gnulib) $(gnulib-tests)
 # This is how to find at build-time things that will be installed there.
-rpath-dirs = math elf dlfcn nss nis rt resolv crypt mathvec
+rpath-dirs = math elf dlfcn nss nis rt resolv crypt mathvec extras
 rpath-link = \
 $(common-objdir):$(subst $(empty) ,:,$(patsubst ../$(subdir),.,$(rpath-dirs:%=$(common-objpfx)%)))
 else
@@ -850,7 +854,7 @@ libio-include = -I$(..)libio
 # List of non-library modules that we build.
 built-modules = iconvprogs iconvdata ldconfig lddlibc4 libmemusage \
 		libSegFault libpcprofile librpcsvc locale-programs \
-		memusagestat nonlib nscd extramodules libnldbl
+		memusagestat nonlib nscd extramodules libnldbl libextras
 
 in-module = $(subst -,_,$(firstword $(libof-$(basename $(@F))) \
 				    $(libof-$(<F)) \
@@ -1091,6 +1095,12 @@ libm = $(common-objpfx)math/libm.a
 libmvec = $(common-objpfx)mathvec/libmvec.a
 endif
 
+ifeq ($(build-shared),yes)
+libextras = $(common-objpfx)extras/libextras_nonshared.a
+else
+libextras = $(common-objpfx)extras/libextras.a
+endif
+
 # These are the subdirectories containing the library source.  The order
 # is more or less arbitrary.  The sorting step will take care of the
 # dependencies.
@@ -1098,7 +1108,7 @@ all-subdirs = csu assert ctype locale intl catgets math setjmp signal	    \
 	      stdlib stdio-common libio malloc string wcsmbs time dirent    \
 	      grp pwd posix io termios resource misc socket sysvipc gmon    \
 	      gnulib iconv iconvdata wctype manual shadow gshadow po argp   \
-	      crypt localedata timezone rt conform debug mathvec	    \
+	      crypt localedata timezone rt conform debug mathvec extras	    \
 	      $(add-on-subdirs) dlfcn elf
 
 ifndef avoid-generated
diff --git a/dlfcn/Makefile b/dlfcn/Makefile
index deab96e..0e4d2b2 100644
--- a/dlfcn/Makefile
+++ b/dlfcn/Makefile
@@ -139,6 +139,7 @@ $(objpfx)bug-atexit2.out: $(objpfx)bug-atexit2-lib.so
 
 ifneq (,$(CXX))
 LDLIBS-bug-atexit3-lib.so = -lstdc++ -lgcc_eh
+$(objpfx)bug-atexit3-lib.so: $(libextras)
 $(objpfx)bug-atexit3: $(libdl)
 $(objpfx)bug-atexit3.out: $(objpfx)bug-atexit3-lib.so
 endif
diff --git a/dlfcn/bug-atexit3-lib.cc b/dlfcn/bug-atexit3-lib.cc
index aba7720..01fe84b 100644
--- a/dlfcn/bug-atexit3-lib.cc
+++ b/dlfcn/bug-atexit3-lib.cc
@@ -1,12 +1,7 @@
 #include <unistd.h>
 #include <string.h>
 
-static void
-write_message (const char *message)
-{
-  ssize_t unused __attribute__ ((unused));
-  unused = write (STDOUT_FILENO, message, strlen (message));
-}
+#include <extras/extras.h>
 
 struct statclass
 {
diff --git a/extras/Makefile b/extras/Makefile
new file mode 100644
index 0000000..504078c
--- /dev/null
+++ b/extras/Makefile
@@ -0,0 +1,46 @@
+# Makefile for extras library, used only at build and test time
+# Copyright (C) 2016 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library 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
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+
+subdir := elf
+
+include ../Makeconfig
+
+extra-libs := libextras
+extra-libs-others = $(extra-libs)
+
+libextras-routines = \
+  check \
+  ignore_stderr \
+  oom_error \
+  set_fortify_handler \
+  temp_file \
+  test_main \
+  write_message \
+  xasprintf \
+  xcalloc \
+  xmalloc \
+  xrealloc \
+
+libextras-static-only-routines := $(libextras-routines)
+# Only build one variant of the library.
+libextras-inhibit-o := .os
+ifeq ($(build-shared),yes)
+libextras-inhibit-o += .o
+endif
+
+include ../Rules
diff --git a/extras/check.c b/extras/check.c
new file mode 100644
index 0000000..b24c08c
--- /dev/null
+++ b/extras/check.c
@@ -0,0 +1,54 @@
+/* Support code for reporting test results.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <extras/check.h>
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static void
+print_failure (const char *file, int line, const char *format, va_list ap)
+{
+  printf ("error: %s:%d: ", file, line);
+  vprintf (format, ap);
+  puts ("");
+}
+
+int
+__extras_print_failure (const char *file, int line,
+                        const char *format, ...)
+{
+  va_list ap;
+  va_start (ap, format);
+  print_failure (file, line, format, ap);
+  va_end (ap);
+  return 1;
+}
+
+void
+__extras_exit_failure (int status, const char *file, int line,
+                       const char *format, ...)
+{
+  va_list ap;
+  va_start (ap, format);
+  print_failure (file, line, format, ap);
+  va_end (ap);
+  exit (status);
+}
+
diff --git a/extras/check.h b/extras/check.h
new file mode 100644
index 0000000..f18062e
--- /dev/null
+++ b/extras/check.h
@@ -0,0 +1,49 @@
+/* Macros for reporting test results.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef EXTRAS_CHECK_H
+#define EXTRAS_CHECK_H
+
+#include <features.h>
+
+__BEGIN_DECLS
+
+/* Print failure message to standard output and return 1.  */
+#define FAIL_RET(...) \
+  return __extras_print_failure (__FILE__, __LINE__, __VA_ARGS__)
+
+/* Print failure message and terminate the process with STATUS.  */
+#define FAIL_EXIT(status, ...) \
+  __extras_exit_failure (status, __FILE__, __LINE__, __VA_ARGS__)
+
+/* Print failure message and terminate with exit status 1.  */
+#define FAIL_EXIT1(...) \
+  __extras_exit_failure (1, __FILE__, __LINE__, __VA_ARGS__)
+
+int __extras_print_failure (const char *file, int line,
+                             const char *format, ...)
+  __attribute__ ((nonnull (1), format (printf, 3, 4)));
+void __extras_exit_failure (int exit_status,
+                            const char *file, int line,
+                            const char *format, ...)
+  __attribute__ ((noreturn, nonnull (2), format (printf, 4, 5)));
+
+
+__END_DECLS
+
+#endif /* EXTRAS_CHECK_H */
diff --git a/extras/extras.h b/extras/extras.h
new file mode 100644
index 0000000..006996d
--- /dev/null
+++ b/extras/extras.h
@@ -0,0 +1,62 @@
+/* Common extra functions.
+   Copyright (C) 1998-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This header file should only contain definitions compatible with
+   C90.  (Using __attribute__ is fine because <features.h> provides a
+   fallback.)  */
+
+#ifndef EXTRAS_H
+#define EXTRAS_H
+
+#include <features.h>
+#include <stddef.h>
+
+/* Test exit status which indicates that the feature is
+   unsupported.  */
+#define EXIT_UNSUPPORTED 77
+
+__BEGIN_DECLS
+
+/* Write a message to standard output.  Can be used in signal
+   handlers.  */
+void write_message (const char *message) __attribute__ ((nonnull (1)));
+
+/* Avoid all the buffer overflow messages on stderr.  */
+void ignore_stderr (void);
+
+/* Set fortification error handler.  Used when tests want to verify that bad
+   code is caught by the library.  */
+void set_fortify_handler (void (*handler) (int sig));
+
+/* Report an out-of-memory error for the allocation of SIZE bytes in
+   FUNCTION, terminating the process.  */
+void oom_error (const char *function, size_t size)
+  __attribute__ ((nonnull (1)));
+
+/* Error-checking wrapper functions which terminate the process on
+   error.  */
+
+void *xmalloc (size_t) __attribute__ ((malloc));
+void *xcalloc (size_t n, size_t s) __attribute__ ((malloc));
+void *xrealloc (void *p, size_t n);
+char *xasprintf (const char *format, ...)
+  __attribute__ ((format (printf, 1, 2), malloc));
+
+__END_DECLS
+
+#endif
diff --git a/extras/ignore_stderr.c b/extras/ignore_stderr.c
new file mode 100644
index 0000000..d5b8ffc
--- /dev/null
+++ b/extras/ignore_stderr.c
@@ -0,0 +1,38 @@
+/* Avoid all the buffer overflow messages on stderr.
+   Copyright (C) 2015-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <extras/extras.h>
+
+#include <fcntl.h>
+#include <paths.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+void
+ignore_stderr (void)
+{
+  int fd = open (_PATH_DEVNULL, O_WRONLY);
+  if (fd == -1)
+    close (STDERR_FILENO);
+  else
+    {
+      dup2 (fd, STDERR_FILENO);
+      close (fd);
+    }
+  setenv ("LIBC_FATAL_STDERR_", "1", 1);
+}
diff --git a/extras/oom_error.c b/extras/oom_error.c
new file mode 100644
index 0000000..b881645
--- /dev/null
+++ b/extras/oom_error.c
@@ -0,0 +1,29 @@
+/* Reporting out-of-memory errors.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <extras/extras.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+void
+oom_error (const char *function, size_t size)
+{
+  printf ("%s: unable to allocate %zu bytes: %m\n", function, size);
+  exit (1);
+}
diff --git a/extras/set_fortify_handler.c b/extras/set_fortify_handler.c
new file mode 100644
index 0000000..3a9043f
--- /dev/null
+++ b/extras/set_fortify_handler.c
@@ -0,0 +1,35 @@
+/* Set signal handler for use in fortify tests.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <extras/extras.h>
+
+#include <signal.h>
+
+void
+set_fortify_handler (void (*handler) (int sig))
+{
+  struct sigaction sa;
+
+  sa.sa_handler = handler;
+  sa.sa_flags = 0;
+  sigemptyset (&sa.sa_mask);
+
+  sigaction (SIGABRT, &sa, NULL);
+  ignore_stderr ();
+}
+
diff --git a/extras/temp_file-internal.h b/extras/temp_file-internal.h
new file mode 100644
index 0000000..3c42b6a
--- /dev/null
+++ b/extras/temp_file-internal.h
@@ -0,0 +1,31 @@
+/* Internal weak declarations for temporary file handling.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef EXTRAS_TEMP_FILE_INTERNAL_H
+#define EXTRAS_TEMP_FILE_INTERNAL_H
+
+/* These functions are called by the test driver if they are
+   defined.  Tests should not call them directly.  */
+
+#include <stdio.h>
+
+void __extras_set_test_dir (const char *name) __attribute__ ((weak));
+void __extras_delete_temp_files (void) __attribute__ ((weak));
+void __extras_print_temp_files (FILE *) __attribute__ ((weak));
+
+#endif /* EXTRAS_TEMP_FILE_INTERNAL_H */
diff --git a/extras/temp_file.c b/extras/temp_file.c
new file mode 100644
index 0000000..32b6560
--- /dev/null
+++ b/extras/temp_file.c
@@ -0,0 +1,121 @@
+/* Temporary file handling for tests.
+   Copyright (C) 1998-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <extras/temp_file.h>
+#include <extras/temp_file-internal.h>
+#include <extras/extras.h>
+
+#include <paths.h>
+#include <search.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* List of temporary files.  */
+static struct temp_name_list
+{
+  struct qelem q;
+  char *name;
+} *temp_name_list;
+
+/* Location of the temporary files.  Set by the test skeleton via
+   __extras_set_test_dir.  The string is not be freed.  */
+static const char *test_dir = _PATH_TMP;
+
+void
+add_temp_file (const char *name)
+{
+  struct temp_name_list *newp
+    = (struct temp_name_list *) xcalloc (sizeof (*newp), 1);
+  char *newname = strdup (name);
+  if (newname != NULL)
+    {
+      newp->name = newname;
+      if (temp_name_list == NULL)
+	temp_name_list = (struct temp_name_list *) &newp->q;
+      else
+	insque (newp, temp_name_list);
+    }
+  else
+    free (newp);
+}
+
+int
+create_temp_file (const char *base, char **filename)
+{
+  char *fname;
+  int fd;
+
+  fname = (char *) xmalloc (strlen (test_dir) + 1 + strlen (base)
+			    + sizeof ("XXXXXX"));
+  strcpy (stpcpy (stpcpy (stpcpy (fname, test_dir), "/"), base), "XXXXXX");
+
+  fd = mkstemp (fname);
+  if (fd == -1)
+    {
+      printf ("cannot open temporary file '%s': %m\n", fname);
+      free (fname);
+      return -1;
+    }
+
+  add_temp_file (fname);
+  if (filename != NULL)
+    *filename = fname;
+  else
+    free (fname);
+
+  return fd;
+}
+
+/* Helper functions called by the test skeleton follow.  */
+
+void
+__extras_set_test_dir (const char *path)
+{
+  test_dir = path;
+}
+
+void
+__extras_delete_temp_files (void)
+{
+  while (temp_name_list != NULL)
+    {
+      remove (temp_name_list->name);
+      free (temp_name_list->name);
+
+      struct temp_name_list *next
+	= (struct temp_name_list *) temp_name_list->q.q_forw;
+      free (temp_name_list);
+      temp_name_list = next;
+    }
+}
+
+void
+__extras_print_temp_files (FILE *f)
+{
+  if (temp_name_list != NULL)
+    {
+      struct temp_name_list *n;
+      fprintf (f, "temp_files=(\n");
+      for (n = temp_name_list;
+           n != NULL;
+           n = (struct temp_name_list *) n->q.q_forw)
+        fprintf (f, "  '%s'\n", n->name);
+      fprintf (f, ")\n");
+    }
+}
diff --git a/extras/temp_file.h b/extras/temp_file.h
new file mode 100644
index 0000000..258169a
--- /dev/null
+++ b/extras/temp_file.h
@@ -0,0 +1,37 @@
+/* Declarations for temporary file handling.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef EXTRAS_TEMP_FILE_H
+#define EXTRAS_TEMP_FILE_H
+
+#include <features.h>
+
+__BEGIN_DECLS
+
+/* Schedule a temporary file for deletion on exit.  */
+void add_temp_file (const char *name);
+
+/* Create a temporary file.  Return the opened file descriptor on
+   success, or -1 on failure.  Write the file name to *FILENAME if
+   FILENAME is not NULL.  In this case, the caller is expected to free
+   *FILENAME.  */
+int create_temp_file (const char *base, char **filename);
+
+__END_DECLS
+
+#endif /* EXTRAS_TEMP_FILE_H */
diff --git a/extras/test-skeleton.c b/extras/test-skeleton.c
new file mode 100644
index 0000000..0080c89
--- /dev/null
+++ b/extras/test-skeleton.c
@@ -0,0 +1,90 @@
+/* Skeleton for test programs.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This file should be included from test cases.  It will define a
+   main function which provides the test wrapper.
+
+   It assumes that the test case defines a function
+
+     int do_test (void);
+
+   and arranges for that function being called under the test wrapper.
+   The do_test function should return 0 to indicate a passing test, 1
+   to indicate a failing test, or 77 to indicate an unsupported test.
+   Other result values could be used to indicate a failing test, but
+   the result of the expression is passed to exit and exit only
+   returns the lower 8 bits of its input.  A non-zero return with some
+   values could cause a test to incorrectly be considered passing when
+   it really failed. For this reason the expression should always
+   return 0, 1, or 77.
+
+   The test function may print out diagnostic or warning messages as well
+   as messages about failures.  These messages should be printed to stdout
+   and not stderr so that the output is properly ordered with respect to
+   the rest of the glibc testsuite run output.
+
+   Several preprocessors macros can be defined before including this
+   file.
+
+   If PREPARE is defined, it must expand to the name of a function of
+   the type
+
+     void PREPARE (void);
+
+   This function will be called early, before running the test, in the
+   parent process which acts as the test supervisor.
+
+   If EXPECTED_SIGNAL is defined, it must expanded to a constant which
+   denotes the expected signal number.
+
+   If EXPECTED_STATUS is defined, it must expand to the expected exit
+   status.
+
+   If TIMEOUT is defined, it must be positive constant.  It overrides
+   the default test timeout and is measured in seconds.
+
+   If TEST_NO_MALLOPT is defined, the test wrapper will not call
+   mallopt.  */
+
+#include <extras/test_main.h>
+
+#include <string.h>
+
+int
+main (int argc, char **argv)
+{
+  struct test_config test_config;
+  memset (&test_config, 0, sizeof (test_config));
+#ifdef PREPARE
+  test_config.prepare_function = (PREPARE);
+#endif
+  test_config.test_function = do_test;
+#ifdef EXPECTED_SIGNAL
+  test_config.expected_signal = (EXPECTED_SIGNAL);
+#endif
+#ifdef EXPECTED_STATUS
+  test_config.expected_status = (EXPECTED_STATUS);
+#endif
+#ifdef TEST_NO_MALLOPT
+  test_config.no_mallopt = 1;
+#endif
+#ifdef TIMEOUT
+  test_config.timeout = TIMEOUT;
+#endif
+  return test_main (argc, argv, &test_config);
+}
diff --git a/extras/test_main.c b/extras/test_main.c
new file mode 100644
index 0000000..8c188ca
--- /dev/null
+++ b/extras/test_main.c
@@ -0,0 +1,360 @@
+/* Main function of the test skeleton.
+   Copyright (C) 1998-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <extras/test_main.h>
+#include <extras/temp_file-internal.h>
+
+#include <assert.h>
+#include <errno.h>
+#include <getopt.h>
+#include <malloc.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+enum
+  {
+    /* Default timeout is twenty seconds.  Tests should normally
+       complete faster than this, but if they don't, that's abnormal
+       (a bug) anyways.  */
+    DEFAULT_TIMEOUT = 20,
+
+    /* Used for command line argument parsing.  */
+    OPT_DIRECT = 1000,
+    OPT_TESTDIR,
+  };
+
+static struct option options[] =
+{
+  { "direct", no_argument, NULL, OPT_DIRECT },
+  { "test-dir", required_argument, NULL, OPT_TESTDIR },
+  { NULL, 0, NULL, 0 }
+};
+
+/* Show people how to run the program.  */
+static void
+usage (void)
+{
+  size_t i;
+
+  printf ("Usage: %s [options]\n"
+          "\n"
+          "Environment Variables:\n"
+          "  TIMEOUTFACTOR          An integer used to scale the timeout\n"
+          "  TMPDIR                 Where to place temporary files\n"
+          "\n",
+          program_invocation_short_name);
+  printf ("Options:\n");
+  for (i = 0; options[i].name; ++i)
+    {
+      int indent;
+
+      indent = printf ("  --%s", options[i].name);
+      if (options[i].has_arg == required_argument)
+        indent += printf (" <arg>");
+      printf ("%*s", 25 - indent, "");
+      switch (options[i].val)
+        {
+        case OPT_DIRECT:
+          printf ("Run the test directly (instead of forking & monitoring)");
+          break;
+        case OPT_TESTDIR:
+          printf ("Override the TMPDIR env var");
+          break;
+        }
+      printf ("\n");
+    }
+}
+
+/* The PID of the test process.  */
+static pid_t test_pid;
+
+/* Timeout handler.  We kill the child and exit with an error.  */
+static void
+__attribute__ ((noreturn))
+signal_handler (int sig __attribute__ ((unused)))
+{
+  int killed;
+  int status;
+
+  assert (test_pid > 1);
+  /* Kill the whole process group.  */
+  kill (-test_pid, SIGKILL);
+  /* In case setpgid failed in the child, kill it individually too.  */
+  kill (test_pid, SIGKILL);
+
+  /* Wait for it to terminate.  */
+  int i;
+  for (i = 0; i < 5; ++i)
+    {
+      killed = waitpid (test_pid, &status, WNOHANG|WUNTRACED);
+      if (killed != 0)
+        break;
+
+      /* Delay, give the system time to process the kill.  If the
+         nanosleep() call return prematurely, all the better.  We
+         won't restart it since this probably means the child process
+         finally died.  */
+      struct timespec ts;
+      ts.tv_sec = 0;
+      ts.tv_nsec = 100000000;
+      nanosleep (&ts, NULL);
+    }
+  if (killed != 0 && killed != test_pid)
+    {
+      printf ("Failed to kill test process: %m\n");
+      exit (1);
+    }
+
+  if (sig == SIGINT)
+    {
+      signal (sig, SIG_DFL);
+      raise (sig);
+    }
+
+  if (killed == 0 || (WIFSIGNALED (status) && WTERMSIG (status) == SIGKILL))
+    puts ("Timed out: killed the child process");
+  else if (WIFSTOPPED (status))
+    printf ("Timed out: the child process was %s\n",
+            strsignal (WSTOPSIG (status)));
+  else if (WIFSIGNALED (status))
+    printf ("Timed out: the child process got signal %s\n",
+            strsignal (WTERMSIG (status)));
+  else
+    printf ("Timed out: killed the child process but it exited %d\n",
+            WEXITSTATUS (status));
+
+  /* Exit with an error.  */
+  exit (1);
+}
+
+
+int
+test_main (int argc, char **argv, const struct test_config *config)
+{
+  int direct = 0;       /* Directly call the test function?  */
+  int status;
+  int opt;
+  unsigned int timeoutfactor = 1;
+  pid_t termpid;
+  const char *test_dir = NULL;
+
+  if (!config->no_mallopt)
+    /* Make uses of freed and uninitialized memory known.  */
+    mallopt (M_PERTURB, 42);
+
+  while ((opt = getopt_long (argc, argv, "+", options, NULL)) != -1)
+    switch (opt)
+      {
+      case '?':
+        usage ();
+        exit (1);
+      case OPT_DIRECT:
+        direct = 1;
+        break;
+      case OPT_TESTDIR:
+        test_dir = optarg;
+        break;
+      }
+
+  /* If set, read the test TIMEOUTFACTOR value from the environment.
+     This value is used to scale the default test timeout values. */
+  char *envstr_timeoutfactor = getenv ("TIMEOUTFACTOR");
+  if (envstr_timeoutfactor != NULL)
+    {
+      char *envstr_conv = envstr_timeoutfactor;
+      unsigned long int env_fact;
+
+      env_fact = strtoul (envstr_timeoutfactor, &envstr_conv, 0);
+      if (*envstr_conv == '\0' && envstr_conv != envstr_timeoutfactor)
+        timeoutfactor = MAX (env_fact, 1);
+    }
+
+  /* Set TMPDIR to specified test directory.  */
+  if (test_dir != NULL)
+    {
+      setenv ("TMPDIR", test_dir, 1);
+
+      if (chdir (test_dir) < 0)
+        {
+          printf ("chdir: %m\n");
+          exit (1);
+        }
+    }
+  else
+    {
+      test_dir = getenv ("TMPDIR");
+      if (test_dir == NULL || test_dir[0] == '\0')
+        test_dir = "/tmp";
+    }
+  if (__extras_set_test_dir != NULL)
+    __extras_set_test_dir (test_dir);
+
+  int timeout = config->timeout;
+  if (timeout == 0)
+    timeout =  DEFAULT_TIMEOUT;
+
+  /* Make sure we see all message, even those on stdout.  */
+  setvbuf (stdout, NULL, _IONBF, 0);
+
+  /* Make sure temporary files are deleted.  */
+  if (__extras_delete_temp_files != NULL)
+      atexit (__extras_delete_temp_files);
+
+  /* Correct for the possible parameters.  */
+  argv[optind - 1] = argv[0];
+  argv += optind - 1;
+  argc -= optind - 1;
+
+  /* Call the initializing function, if one is available.  */
+  if (config->prepare_function != NULL)
+    config->prepare_function ();
+
+  const char *envstr_direct = getenv ("TEST_DIRECT");
+  if (envstr_direct != NULL)
+    {
+      FILE *f = fopen (envstr_direct, "w");
+      if (f == NULL)
+        {
+          printf ("cannot open TEST_DIRECT output file '%s': %m\n",
+                  envstr_direct);
+          exit (1);
+        }
+
+      fprintf (f, "timeout=%u\ntimeoutfactor=%u\n",
+               config->timeout, timeoutfactor);
+      if (config->expected_status != 0)
+        fprintf (f, "exit=%u\n", config->expected_status);
+      if (config->expected_signal != 0)
+        fprintf (f, "signal=%s\n", strsignal (config->expected_signal));
+
+      if (__extras_print_temp_files != NULL)
+        __extras_print_temp_files (f);
+
+      fclose (f);
+      direct = 1;
+    }
+
+  /* If we are not expected to fork run the function immediately.  */
+  if (direct)
+    return config->test_function ();
+
+  /* Set up the test environment:
+     - prevent core dumps
+     - set up the timer
+     - fork and execute the function.  */
+
+  pid_t test_pid = fork ();
+  if (test_pid == 0)
+    {
+      /* This is the child.  */
+#ifdef RLIMIT_CORE
+      /* Try to avoid dumping core.  */
+      struct rlimit core_limit;
+      core_limit.rlim_cur = 0;
+      core_limit.rlim_max = 0;
+      setrlimit (RLIMIT_CORE, &core_limit);
+#endif
+
+      /* We put the test process in its own pgrp so that if it bogusly
+         generates any job control signals, they won't hit the whole build.  */
+      if (setpgid (0, 0) != 0)
+        printf ("Failed to set the process group ID: %m\n");
+
+      /* Execute the test function and exit with the return value.   */
+      exit (config->test_function ());
+    }
+  else if (test_pid < 0)
+    {
+      printf ("Cannot fork test program: %m\n");
+      exit (1);
+    }
+
+  /* Set timeout.  */
+  signal (SIGALRM, signal_handler);
+  alarm (config->timeout * timeoutfactor);
+
+  /* Make sure we clean up if the wrapper gets interrupted.  */
+  signal (SIGINT, signal_handler);
+
+  /* Wait for the regular termination.  */
+  termpid = TEMP_FAILURE_RETRY (waitpid (test_pid, &status, 0));
+  if (termpid == -1)
+    {
+      printf ("Waiting for test program failed: %m\n");
+      exit (1);
+    }
+  if (termpid != test_pid)
+    {
+      printf ("Oops, wrong test program terminated: expected %ld, got %ld\n",
+              (long int) test_pid, (long int) termpid);
+      exit (1);
+    }
+
+  /* Process terminated normaly without timeout etc.  */
+  if (WIFEXITED (status))
+    {
+      if (config->expected_status == 0)
+        {
+          if (config->expected_signal == 0)
+            /* Simply exit with the return value of the test.  */
+            return WEXITSTATUS (status);
+          else
+            {
+              printf ("Expected signal '%s' from child, got none\n",
+                      strsignal (config->expected_signal));
+              exit (1);
+            }
+        }
+      else
+        {
+          /* Non-zero exit status is expected */
+          if (WEXITSTATUS (status) != config->expected_status)
+            {
+              printf ("Expected status %d, got %d\n",
+                      config->expected_status, WEXITSTATUS (status));
+              exit (1);
+            }
+        }
+      return 0;
+    }
+  /* Process was killed by timer or other signal.  */
+  else
+    {
+      if (config->expected_signal == 0)
+        {
+          printf ("Didn't expect signal from child: got `%s'\n",
+                  strsignal (WTERMSIG (status)));
+          exit (1);
+        }
+      else if (WTERMSIG (status) != config->expected_signal)
+        {
+          printf ("Incorrect signal from child: got `%s', need `%s'\n",
+                  strsignal (WTERMSIG (status)),
+                  strsignal (config->expected_signal));
+          exit (1);
+        }
+
+      return 0;
+    }
+}
diff --git a/extras/test_main.h b/extras/test_main.h
new file mode 100644
index 0000000..01627ea
--- /dev/null
+++ b/extras/test_main.h
@@ -0,0 +1,34 @@
+/* Interfaces for the test skeleton.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef EXTRAS_TEST_MAIN_H
+#define EXTRAS_TEST_MAIN_H
+
+struct test_config
+{
+  void (*prepare_function) (void);
+  int (*test_function) (void);
+  int timeout;           /* Test timeout in seconds.  */
+  int expected_status;   /* Expected exit status.  */
+  int expected_signal;   /* If non-zero, expect termination by signal.  */
+  char no_mallopt;       /* Boolean flag to disable mallopt.  */
+};
+
+int test_main (int argc, char **argv, const struct test_config *);
+
+#endif /* EXTRAS_TEST_MAIN_H */
diff --git a/extras/write_message.c b/extras/write_message.c
new file mode 100644
index 0000000..0fd8afc
--- /dev/null
+++ b/extras/write_message.c
@@ -0,0 +1,30 @@
+/* Write a message to standard output.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <extras/extras.h>
+
+#include <string.h>
+#include <unistd.h>
+
+void
+write_message (const char *message)
+{
+  ssize_t unused __attribute__ ((unused));
+  unused = write (STDOUT_FILENO, message, strlen (message));
+}
+
diff --git a/extras/xasprintf.c b/extras/xasprintf.c
new file mode 100644
index 0000000..045c2e8
--- /dev/null
+++ b/extras/xasprintf.c
@@ -0,0 +1,38 @@
+/* Error-checking wrapper for asprintf.
+   Copyright (C) 1998-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <extras/extras.h>
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+char *
+xasprintf (const char *format, ...)
+{
+  va_list ap;
+  va_start (ap, format);
+  char *result;
+  if (vasprintf (&result, format, ap) < 0)
+    {
+      printf ("error: asprintf: %m\n");
+      exit (1);
+    }
+  va_end (ap);
+  return result;
+}
diff --git a/extras/xcalloc.c b/extras/xcalloc.c
new file mode 100644
index 0000000..4b6af5a
--- /dev/null
+++ b/extras/xcalloc.c
@@ -0,0 +1,34 @@
+/* Error-checking wrapper for calloc.
+   Copyright (C) 1998-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <extras/extras.h>
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void *
+xcalloc (size_t n, size_t s)
+{
+  void *p;
+
+  p = calloc (n, s);
+  if (p == NULL)
+    oom_error ("calloc", n * s);
+  return p;
+}
diff --git a/extras/xmalloc.c b/extras/xmalloc.c
new file mode 100644
index 0000000..b53e2a0
--- /dev/null
+++ b/extras/xmalloc.c
@@ -0,0 +1,34 @@
+/* Error-checking wrapper for malloc.
+   Copyright (C) 1998-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <extras/extras.h>
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void *
+xmalloc (size_t n)
+{
+  void *p;
+
+  p = malloc (n);
+  if (p == NULL)
+    oom_error ("malloc", n);
+  return p;
+}
diff --git a/extras/xrealloc.c b/extras/xrealloc.c
new file mode 100644
index 0000000..9b0e7a6
--- /dev/null
+++ b/extras/xrealloc.c
@@ -0,0 +1,32 @@
+/* Error-checking wrapper for realloc.
+   Copyright (C) 1998-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <extras/extras.h>
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void *
+xrealloc (void *p, size_t n)
+{
+  void *result = realloc (p, n);
+  if (result == NULL && (n > 0 || p == NULL))
+    oom_error ("realloc", n);
+  return result;
+}
diff --git a/io/tst-open-tmpfile.c b/io/tst-open-tmpfile.c
index 9242d62..d89aa79 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 <extras/extras.h>
 
 #ifdef O_TMPFILE
 typedef int (*wrapper_func) (const char *, int, mode_t);
@@ -317,3 +314,5 @@ do_test (void)
 }
 
 #endif  /* O_TMPFILE */
+
+#include <extras/test-skeleton.c>
diff --git a/io/tst-posix_fallocate-common.c b/io/tst-posix_fallocate-common.c
index 2f15a5d..5157ec9 100644
--- a/io/tst-posix_fallocate-common.c
+++ b/io/tst-posix_fallocate-common.c
@@ -17,18 +17,15 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <fcntl.h>
-#include <sys/types.h>
+#include <limits.h>
+#include <stdint.h>
 #include <sys/stat.h>
+#include <sys/types.h>
 #include <unistd.h>
 
-static void do_prepare (void);
-#define PREPARE(argc, argv)     do_prepare ()
-static int do_test (void);
-#define TEST_FUNCTION           do_test ()
-
-#define TIMEOUT 20 /* sec.  */
-
-#include <test-skeleton.c>
+#include <extras/extras.h>
+#include <extras/check.h>
+#include <extras/temp_file.h>
 
 static char *temp_filename;
 static int temp_fd;
@@ -41,9 +38,6 @@ do_prepare (void)
     FAIL_EXIT1 ("cannot create temporary file: %m\n");
 }
 
-#define FAIL(str) \
-  do { printf ("error: %s (line %d)\n", str, __LINE__); return 1; } while (0)
-
 static int
 do_test_with_offset (off_t offset)
 {
@@ -83,3 +77,10 @@ do_test_with_offset (off_t offset)
 
   return 0;
 }
+
+#define PREPARE do_prepare
+
+/* This function is defined by the individual tests.  */
+static int do_test (void);
+
+#include <extras/test-skeleton.c>
diff --git a/malloc/tst-malloc-backtrace.c b/malloc/tst-malloc-backtrace.c
index 3aee7fd..a6c34cf 100644
--- a/malloc/tst-malloc-backtrace.c
+++ b/malloc/tst-malloc-backtrace.c
@@ -16,9 +16,11 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-
+#include <signal.h>
 #include <stdlib.h>
 
+#include <extras/extras.h>
+
 #define SIZE 4096
 
 /* Wrap free with a function to prevent gcc from optimizing it out.  */
@@ -30,13 +32,6 @@ call_free (void *ptr)
   *(size_t *)(ptr - sizeof (size_t)) = 1;
 }
 
-int do_test (void);
-
-#define TEST_FUNCTION do_test ()
-#define EXPECTED_SIGNAL SIGABRT
-
-#include "../test-skeleton.c"
-
 int
 do_test (void)
 {
@@ -53,3 +48,6 @@ do_test (void)
      doesn't optimize out that malloc call.  */
   return (ptr1 == ptr2);
 }
+
+#define EXPECTED_SIGNAL SIGABRT
+#include <extras/test-skeleton.c>
diff --git a/nptl/tst-cleanup0.c b/nptl/tst-cleanup0.c
index 011e5a6..a3a868b 100644
--- a/nptl/tst-cleanup0.c
+++ b/nptl/tst-cleanup0.c
@@ -71,5 +71,4 @@ do_test (void)
 
 
 #define EXPECTED_STATUS 9
-#define TEST_FUNCTION do_test ()
-#include "../test-skeleton.c"
+#include <extras/test-skeleton.c>
diff --git a/posix/tst-posix_fadvise-common.c b/posix/tst-posix_fadvise-common.c
index bb04c61..2d37665 100644
--- a/posix/tst-posix_fadvise-common.c
+++ b/posix/tst-posix_fadvise-common.c
@@ -16,17 +16,17 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#include <errno.h>
 #include <fcntl.h>
+#include <limits.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
 
-static void do_prepare (void);
-#define PREPARE(argc, argv)     do_prepare ()
-static int do_test (void);
-#define TEST_FUNCTION           do_test ()
-
-#include <test-skeleton.c>
+#include <extras/extras.h>
+#include <extras/check.h>
+#include <extras/temp_file.h>
 
 static char *temp_filename;
 static int temp_fd;
@@ -101,3 +101,10 @@ do_test_common (void)
 
   return 0;
 }
+
+#define PREPARE do_prepare
+
+/* This function is defined by the individual tests.  */
+static int do_test (void);
+
+#include <extras/test-skeleton.c>
diff --git a/sysdeps/unix/sysv/linux/tst-fallocate-common.c b/sysdeps/unix/sysv/linux/tst-fallocate-common.c
index d98bf4a..b8f4333 100644
--- a/sysdeps/unix/sysv/linux/tst-fallocate-common.c
+++ b/sysdeps/unix/sysv/linux/tst-fallocate-common.c
@@ -16,23 +16,22 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#include <errno.h>
 #include <fcntl.h>
-#include <sys/types.h>
+#include <limits.h>
+#include <stdint.h>
+#include <string.h>
 #include <sys/stat.h>
+#include <sys/types.h>
 #include <unistd.h>
 
-static void do_prepare (void);
-#define PREPARE(argc, argv)     do_prepare ()
-static int do_test (void);
-#define TEST_FUNCTION           do_test ()
-
-#define TIMEOUT 20 /* sec.  */
+#include <extras/extras.h>
+#include <extras/check.h>
+#include <extras/temp_file.h>
 
 #define XSTR(s) STR(S)
 #define STR(s)  #s
 
-#include <test-skeleton.c>
-
 static char *temp_filename;
 static int temp_fd;
 
@@ -91,3 +90,10 @@ do_test_with_offset (off_t offset)
 
   return 0;
 }
+
+#define PREPARE do_prepare
+
+/* This function is defined by the individual tests.  */
+static int do_test (void);
+
+#include <extras/test-skeleton.c>
diff --git a/sysdeps/unix/sysv/linux/tst-sync_file_range.c b/sysdeps/unix/sysv/linux/tst-sync_file_range.c
index 499a234..a41e3ed 100644
--- a/sysdeps/unix/sysv/linux/tst-sync_file_range.c
+++ b/sysdeps/unix/sysv/linux/tst-sync_file_range.c
@@ -18,21 +18,18 @@
 
 /* sync_file_range is only define for LFS.  */
 #define _FILE_OFFSET_BITS 64
-#include <fcntl.h>
 #include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <sys/stat.h>
 
-static void do_prepare (void);
-#define PREPARE(argc, argv)     do_prepare ()
-static int do_test (void);
-#define TEST_FUNCTION           do_test ()
-
-#define TIMEOUT 20 /* sec.  */
+#include <extras/temp_file.h>
+#include <extras/check.h>
 
 #define XSTR(s) STR(S)
 #define STR(s)  #s
 
-#include <test-skeleton.c>
-
 static char *temp_filename;
 static int temp_fd;
 
@@ -129,3 +126,8 @@ do_test (void)
 
   return 0;
 }
+
+#define PREPARE do_prepare
+
+#include <extras/test-skeleton.c>
+
diff --git a/test-skeleton.c b/test-skeleton.c
index fa457be..e66e6f6 100644
--- a/test-skeleton.c
+++ b/test-skeleton.c
@@ -34,6 +34,8 @@
 #include <sys/param.h>
 #include <time.h>
 
+#include <extras/extras.h>
+
 /* The test function is normally called `do_test' and it is called
    with argc and argv as the arguments.  We nevertheless provide the
    possibility to overwrite this name.
@@ -85,94 +87,6 @@ static pid_t pid;
 /* Directory to place temporary files in.  */
 static const char *test_dir;
 
-#define _FAIL(...) \
-  printf ("error: %s:%d: ", __FILE__, __LINE__); \
-  printf (__VA_ARGS__); \
-  printf ("\n"); \
-
-#define FAIL_RET(...) \
-  ({ \
-     _FAIL (__VA_ARGS__); \
-     return 1; \
-  })
-
-#define FAIL_EXIT(value, ...) \
-  ({ \
-     _FAIL (__VA_ARGS__); \
-     exit (value); \
-  })
-
-#define FAIL_EXIT1(...) FAIL_EXIT(1, __VA_ARGS__)
-
-static void
-oom_error (const char *fn, size_t size)
-{
-  printf ("%s: unable to allocate %zu bytes: %m\n", fn, size);
-  exit (1);
-}
-
-/* Allocate N bytes of memory dynamically, with error checking.  */
-__attribute__ ((unused))
-static void *
-xmalloc (size_t n)
-{
-  void *p;
-
-  p = malloc (n);
-  if (p == NULL)
-    oom_error ("malloc", n);
-  return p;
-}
-
-/* Allocate memory for N elements of S bytes, with error checking.  */
-__attribute__ ((unused))
-static void *
-xcalloc (size_t n, size_t s)
-{
-  void *p;
-
-  p = calloc (n, s);
-  if (p == NULL)
-    oom_error ("calloc", n * s);
-  return p;
-}
-
-/* Change the size of an allocated block of memory P to N bytes,
-   with error checking.  */
-__attribute__ ((unused))
-static void *
-xrealloc (void *p, size_t n)
-{
-  void *result = realloc (p, n);
-  if (result == NULL && (n > 0 || p == NULL))
-    oom_error ("realloc", n);
-  return result;
-}
-
-/* Call asprintf with error checking.  */
-__attribute__ ((always_inline, format (printf, 1, 2)))
-static __inline__ char *
-xasprintf (const char *format, ...)
-{
-  char *result;
-  if (asprintf (&result, format, __builtin_va_arg_pack ()) < 0)
-    {
-      printf ("error: asprintf: %m\n");
-      exit (1);
-    }
-  return result;
-}
-
-/* Write a message to standard output.  Can be used in signal
-   handlers.  */
-static void
-__attribute__ ((unused))
-write_message (const char *message)
-{
-  ssize_t unused __attribute__ ((unused));
-  unused = write (STDOUT_FILENO, message, strlen (message));
-}
-
 /* List of temporary files.  */
 struct temp_name_list
 {
@@ -317,38 +231,6 @@ signal_handler (int sig __attribute__ ((unused)))
   exit (1);
 }
 
-/* Avoid all the buffer overflow messages on stderr.  */
-static void
-__attribute__ ((unused))
-ignore_stderr (void)
-{
-  int fd = open (_PATH_DEVNULL, O_WRONLY);
-  if (fd == -1)
-    close (STDERR_FILENO);
-  else
-    {
-      dup2 (fd, STDERR_FILENO);
-      close (fd);
-    }
-  setenv ("LIBC_FATAL_STDERR_", "1", 1);
-}
-
-/* Set fortification error handler.  Used when tests want to verify that bad
-   code is caught by the library.  */
-static void
-__attribute__ ((unused))
-set_fortify_handler (void (*handler) (int sig))
-{
-  struct sigaction sa;
-
-  sa.sa_handler = handler;
-  sa.sa_flags = 0;
-  sigemptyset (&sa.sa_mask);
-
-  sigaction (SIGABRT, &sa, NULL);
-  ignore_stderr ();
-}
-
 /* Show people how to run the program.  */
 static void
 usage (void)
