/* Test dlopen rollback after failures involving NODELETE objects (bug 20839).

   Copyright (C) 2019 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

   <https://www.gnu.org/licenses/>.  */

#include <dlfcn.h>

#include <errno.h>

#include <gnu/lib-names.h>

#include <stddef.h>

#include <stdio.h>

#include <string.h>

#include <support/check.h>

#include <support/xdlfcn.h>

static int

do_test (void)

{

  /* This test uses libpthread as the canonical NODELETE module.  If

     libpthread is no longer NODELETE because it has been merged into

     libc, the test needs to be updated.  */

  TEST_VERIFY (dlsym (NULL, "pthread_create") == NULL);

  /* This is expected to fail because of the missing dependency.  */

  puts ("info: attempting to load tst-dlopenfailmod1.so");

  TEST_VERIFY (dlopen ("tst-dlopenfailmod1.so", RTLD_LAZY) == NULL);

  const char *message = dlerror ();

  TEST_COMPARE_STRING (message,

                       "tst-dlopenfail-missingmod.so:"

                       " cannot open shared object file:"

                       " No such file or directory");

  /* Do not probe for the presence of libpthread at this point because

     that might trigger relocation if bug 20839 is present, obscuring

     a subsequent crash.  */

  /* This is expected to succeed.  */

  puts ("info: loading tst-dlopenfailmod2.so");

  void *handle = xdlopen ("tst-dlopenfailmod2.so", RTLD_NOW);

  xdlclose (handle);

  /* libpthread should remain loaded.  */

  TEST_VERIFY (dlopen (LIBPTHREAD_SO, RTLD_LAZY | RTLD_NOLOAD) != NULL);

  TEST_VERIFY (dlsym (NULL, "pthread_create") == NULL);

  /* We can make libpthread global, and then the symbol should become

     available.  */

  TEST_VERIFY (dlopen (LIBPTHREAD_SO, RTLD_LAZY | RTLD_GLOBAL) != NULL);

  TEST_VERIFY (dlsym (NULL, "pthread_create") != NULL);

  /* sem_open is sufficiently complex to depend on relocations.  */

  void *(*sem_open_ptr) (const char *, int flag, ...)

    = dlsym (NULL, "sem_open");

  if (sem_open_ptr == NULL)

    /* Hurd does not implement sem_open.  */

    puts ("warning: sem_open not found, further testing not possible");

  else

    {

      errno = 0;

      TEST_VERIFY (sem_open_ptr ("/", 0) == NULL);

      TEST_COMPARE (errno, EINVAL);

    }

  return 0;

}

#include <support/test-driver.c>