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, 46 insertions, 705 deletions

diff --git a/test-skeleton.c b/test-skeleton.c
index 154096fd8e..55ded17cab 100644
--- a/test-skeleton.c
+++ b/test-skeleton.c
@@ -1,4 +1,4 @@
-/* Skeleton for test programs.
+/* Legacy test skeleton.
    Copyright (C) 1998-2016 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
@@ -17,6 +17,13 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+/* This test skeleton is to support running existing tests.  New tests
+   should use <support/test-driver.c> instead; see the documentation
+   in that file for instructions, and <support/README-testing.c> for a
+   minimal example.  */
+
+/* This list of headers is needed so that tests which include
+   "../test-skeleton.c" at the beginning still compile.  */
 #include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
@@ -35,733 +42,67 @@
 #include <time.h>
 #include <stdint.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.
-
-   The TEST_FUNCTION expression should have a type of 'int' and 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.  */
-
-#ifndef TEST_FUNCTION
-# define TEST_FUNCTION do_test (argc, argv)
-#endif
-
-#ifndef TEST_DATA_LIMIT
-# define TEST_DATA_LIMIT (64 << 20) /* Data limit (bytes) to run with.  */
-#endif
-
-#ifndef TIMEOUT
-  /* Default timeout is twenty seconds.  Tests should normally complete faster
-     than this, but if they don't, that's abnormal (a bug) anyways.  */
-# define TIMEOUT 20
-#endif
-
-#define OPT_DIRECT 1000
-#define OPT_TESTDIR 1001
-
-static struct option options[] =
-{
-#ifdef CMDLINE_OPTIONS
-  CMDLINE_OPTIONS
-#endif
-  { "direct", no_argument, NULL, OPT_DIRECT },
-  { "test-dir", required_argument, NULL, OPT_TESTDIR },
-  { NULL, 0, NULL, 0 }
-};
-
-/* PID of the test itself.  */
-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
-{
-  struct qelem q;
-  char *name;
-} *temp_name_list;
-
-/* Add temporary files in list.  */
-static void
-__attribute__ ((unused))
-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);
-}
-
-/* Delete all temporary files.  */
-static void
-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;
-    }
-}
+#include <support/support.h>
+#include <support/check.h>
+#include <support/xsignal.h>
+#include <support/temp_file.h>
 
-/* 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.  */
+/* TEST_FUNCTION is no longer used. */
 static int
-__attribute__ ((unused))
-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;
-}
-
-/* Timeout handler.  We kill the child and exit with an error.  */
-static void
-__attribute__ ((noreturn))
-signal_handler (int sig __attribute__ ((unused)))
+legacy_test_function (int argc __attribute__ ((unused)),
+		      char **argv __attribute__ ((unused)))
 {
-  int killed;
-  int status;
-
-  assert (pid > 1);
-  /* Kill the whole process group.  */
-  kill (-pid, SIGKILL);
-  /* In case setpgid failed in the child, kill it individually too.  */
-  kill (pid, SIGKILL);
-
-  /* Wait for it to terminate.  */
-  int i;
-  for (i = 0; i < 5; ++i)
-    {
-      killed = waitpid (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 != pid)
-    {
-      printf ("Failed to kill test process: %m\n");
-      exit (1);
-    }
-
-#ifdef CLEANUP_HANDLER
-  CLEANUP_HANDLER;
-#endif
-
-  if (sig == SIGINT)
-    {
-      signal (sig, SIG_DFL);
-      raise (sig);
-    }
-
-  /* If we expected this signal: good!  */
-#ifdef EXPECTED_SIGNAL
-  if (EXPECTED_SIGNAL == SIGALRM)
-    exit (0);
+#ifdef TEST_FUNCTION
+  return TEST_FUNCTION;
+# undef TEST_FUNCTION
+#else
+  return do_test (argc, argv);
 #endif
-
-  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);
 }
+#define TEST_FUNCTION_ARGV legacy_test_function
 
-/* Avoid all the buffer overflow messages on stderr.  */
+/* PREPARE is a function name in the new skeleton.  */
+#ifdef PREPARE
 static void
-__attribute__ ((unused))
-ignore_stderr (void)
+legacy_prepare_function  (int argc __attribute__ ((unused)),
+			  char **argv __attribute__ ((unused)))
 {
-  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);
+  PREPARE (argc, argv);
 }
+# undef PREPARE
+# define PREPARE legacy_prepare_function
+#endif
 
-/* Set fortification error handler.  Used when tests want to verify that bad
-   code is caught by the library.  */
+/* CLEANUP_HANDLER is a function name in the new skeleton.  */
+#ifdef CLEANUP_HANDLER
 static void
-__attribute__ ((unused))
-set_fortify_handler (void (*handler) (int sig))
+legacy_cleanup_handler_function  (void)
 {
-  struct sigaction sa;
-
-  sa.sa_handler = handler;
-  sa.sa_flags = 0;
-  sigemptyset (&sa.sa_mask);
-
-  sigaction (SIGABRT, &sa, NULL);
-  ignore_stderr ();
+  CLEANUP_HANDLER;
 }
+# undef CLEANUP_HANDLER
+# define CLEANUP_HANDLER legacy_cleanup_handler_function
+#endif
 
-/* Show people how to run the program.  */
+/* CMDLINE_PROCESS is a function name in the new skeleton.  */
+#ifdef CMDLINE_PROCESS
 static void
-usage (void)
+legacy_cmdline_process_function (int c)
 {
-  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)
+  switch (c)
     {
-      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");
+      CMDLINE_PROCESS
     }
 }
-
-/* We provide the entry point here.  */
-int
-main (int argc, char *argv[])
-{
-  int direct = 0;	/* Directly call the test function?  */
-  int status;
-  int opt;
-  unsigned int timeoutfactor = 1;
-  pid_t termpid;
-
-#ifndef TEST_NO_MALLOPT
-  /* Make uses of freed and uninitialized memory known.  */
-  mallopt (M_PERTURB, 42);
-#endif
-
-#ifdef STDOUT_UNBUFFERED
-  setbuf (stdout, NULL);
-#endif
-
-  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;
-#ifdef CMDLINE_PROCESS
-	CMDLINE_PROCESS
-#endif
-      }
-
-  /* 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";
-    }
-
-  /* Make sure we see all message, even those on stdout.  */
-  setvbuf (stdout, NULL, _IONBF, 0);
-
-  /* Make sure temporary files are deleted.  */
-  atexit (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.  */
-#ifdef PREPARE
-  PREPARE (argc, argv);
-#endif
-
-  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", TIMEOUT, timeoutfactor);
-#ifdef EXPECTED_STATUS
-      fprintf (f, "exit=%u\n", EXPECTED_STATUS);
-#endif
-#ifdef EXPECTED_SIGNAL
-      switch (EXPECTED_SIGNAL)
-        {
-        default: abort ();
-# define init_sig(signo, name, text) \
-        case signo: fprintf (f, "signal=%s\n", name); break;
-# include <siglist.h>
-# undef init_sig
-        }
-#endif
-
-      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");
-        }
-
-      fclose (f);
-      direct = 1;
-    }
-
-  /* If we are not expected to fork run the function immediately.  */
-  if (direct)
-    return TEST_FUNCTION;
-
-  /* Set up the test environment:
-     - prevent core dumps
-     - set up the timer
-     - fork and execute the function.  */
-
-  pid = fork ();
-  if (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);
+# undef CMDLINE_PROCESS
+# define CMDLINE_PROCESS legacy_cmdline_process_function
 #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 (TEST_FUNCTION);
-    }
-  else if (pid < 0)
-    {
-      printf ("Cannot fork test program: %m\n");
-      exit (1);
-    }
-
-  /* Set timeout.  */
-  signal (SIGALRM, signal_handler);
-  alarm (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 (pid, &status, 0));
-  if (termpid == -1)
-    {
-      printf ("Waiting for test program failed: %m\n");
-      exit (1);
-    }
-  if (termpid != pid)
-    {
-      printf ("Oops, wrong test program terminated: expected %ld, got %ld\n",
-	      (long int) pid, (long int) termpid);
-      exit (1);
-    }
-
-  /* Process terminated normaly without timeout etc.  */
-  if (WIFEXITED (status))
-    {
-#ifndef EXPECTED_STATUS
-# ifndef EXPECTED_SIGNAL
-      /* Simply exit with the return value of the test.  */
-      return WEXITSTATUS (status);
-# else
-      printf ("Expected signal '%s' from child, got none\n",
-	      strsignal (EXPECTED_SIGNAL));
-      exit (1);
-# endif
-#else
-      if (WEXITSTATUS (status) != EXPECTED_STATUS)
-        {
-          printf ("Expected status %d, got %d\n",
-	          EXPECTED_STATUS, WEXITSTATUS (status));
-          exit (1);
-        }
-
-      return 0;
-#endif
-    }
-  /* Process was killed by timer or other signal.  */
-  else
-    {
-#ifndef EXPECTED_SIGNAL
-      printf ("Didn't expect signal from child: got `%s'\n",
-	      strsignal (WTERMSIG (status)));
-      exit (1);
-#else
-      if (WTERMSIG (status) != EXPECTED_SIGNAL)
-	{
-	  printf ("Incorrect signal from child: got `%s', need `%s'\n",
-		  strsignal (WTERMSIG (status)),
-		  strsignal (EXPECTED_SIGNAL));
-	  exit (1);
-	}
-
-      return 0;
-#endif
-    }
-}
+/* Include the new test-skeleton.  */
+#include <support/test-driver.c>
 
 /* The following functionality is only available if <pthread.h> was
    included before this file.  */
 #ifdef _PTHREAD_H
-
-/* Call pthread_sigmask with error checking.  */
-static void
-xpthread_sigmask (int how, const sigset_t *set, sigset_t *oldset)
-{
-  if (pthread_sigmask (how, set, oldset) != 0)
-    {
-      write_message ("error: pthread_setmask failed\n");
-      _exit (1);
-    }
-}
-
-/* Call pthread_mutex_lock with error checking.  */
-__attribute__ ((unused))
-static void
-xpthread_mutex_lock (pthread_mutex_t *mutex)
-{
-  int ret = pthread_mutex_lock (mutex);
-  if (ret != 0)
-    {
-      errno = ret;
-      printf ("error: pthread_mutex_lock: %m\n");
-      exit (1);
-    }
-}
-
-/* Call pthread_spin_lock with error checking.  */
-__attribute__ ((unused))
-static void
-xpthread_spin_lock (pthread_spinlock_t *lock)
-{
-  int ret = pthread_spin_lock (lock);
-  if (ret != 0)
-    {
-      errno = ret;
-      printf ("error: pthread_spin_lock: %m\n");
-      exit (1);
-    }
-}
-
-/* Call pthread_cond_wait with error checking.  */
-__attribute__ ((unused))
-static void
-xpthread_cond_wait (pthread_cond_t * cond,
-		    pthread_mutex_t * mutex)
-{
-  int ret = pthread_cond_wait (cond, mutex);
-  if (ret != 0)
-    {
-      errno = ret;
-      printf ("error: pthread_cond_wait: %m\n");
-      exit (1);
-    }
-}
-
-/* Call pthread_barrier_wait with error checking.  */
-__attribute__ ((unused))
-static int
-xpthread_barrier_wait (pthread_barrier_t *barrier)
-{
-  int ret = pthread_barrier_wait (barrier);
-  if (ret != 0 && ret != PTHREAD_BARRIER_SERIAL_THREAD)
-    {
-      errno = ret;
-      printf ("error: pthread_barrier_wait: %m\n");
-      exit (1);
-    }
-  return ret;
-}
-
-/* Call pthread_create with error checking.  */
-static pthread_t
-xpthread_create (pthread_attr_t *attr,
-		 void *(*thread_func) (void *), void *closure)
-{
-  pthread_t thr;
-  int ret = pthread_create (&thr, attr, thread_func, closure);
-  if (ret != 0)
-    {
-      errno = ret;
-      printf ("error: pthread_create: %m\n");
-      exit (1);
-    }
-  return thr;
-}
-
-/* Call pthread_detach with error checking.  */
-static void
-xpthread_detach (pthread_t thr)
-{
-  int ret = pthread_detach (thr);
-  if (ret != 0)
-    {
-      errno = ret;
-      printf ("error: pthread_detach: %m\n");
-      exit (1);
-    }
-}
-
-/* Call pthread_join with error checking.  */
-__attribute__ ((unused))
-static void *
-xpthread_join (pthread_t thr)
-{
-  void *result;
-  int ret = pthread_join (thr, &result);
-  if (ret != 0)
-    {
-      errno = ret;
-      printf ("error: pthread_join: %m\n");
-      exit (1);
-    }
-  return result;
-}
-
-/* Used to implement the delayed_exit function defined below.  */
-static void *
-delayed_exit_thread (void *seconds_as_ptr)
-{
-  int seconds = (uintptr_t) seconds_as_ptr;
-  struct timespec delay = { seconds, 0 };
-  struct timespec remaining = { 0 };
-  if (nanosleep (&delay, &remaining) != 0)
-    {
-      printf ("error: nanosleep: %m\n");
-      _exit (1);
-    }
-  /* Exit the process sucessfully.  */
-  exit (0);
-  return NULL;
-}
-
-/* Exit (with status 0) after SECONDS have elapsed, from a helper
-   thread.  The process is terminated with the exit function, so
-   atexit handlers are executed.  */
-__attribute__ ((unused))
-static void
-delayed_exit (int seconds)
-{
-  /* Create the new thread with all signals blocked.  */
-  sigset_t all_blocked;
-  sigfillset (&all_blocked);
-  sigset_t old_set;
-  xpthread_sigmask (SIG_SETMASK, &all_blocked, &old_set);
-  /* Create a detached thread. */
-  pthread_t thr = xpthread_create
-    (NULL, delayed_exit_thread, (void *) (uintptr_t) seconds);
-  xpthread_detach (thr);
-  /* Restore the original signal mask.  */
-  xpthread_sigmask (SIG_SETMASK, &old_set, NULL);
-}
-
+# include <support/xthread.h>
 #endif	/* _PTHREAD_H */