sysdeps/unix/sysv/linux/tst-misalign-clone-internal.c

   1 /* Verify that __clone_internal properly aligns the child stack.
   2    Copyright (C) 2021-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <sched.h>
  20 #include <stdbool.h>
  21 #include <stdint.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <sys/wait.h>
  25 #include <unistd.h>
  26 #include <libc-pointer-arith.h>
  27 #include <tst-stack-align.h>
  28 #include <clone_internal.h>
  29 #include <support/xunistd.h>
  30 #include <support/check.h>
  31
  32 static int
  33 check_stack_alignment (void *arg)
  34 {
  35   puts ("in f");
  36
  37   return TEST_STACK_ALIGN () ? 1 : 0;
  38 }
  39
  40 static int
  41 do_test (void)
  42 {
  43   puts ("in do_test");
  44
  45   if (TEST_STACK_ALIGN ())
  46     FAIL_EXIT1 ("stack isn't aligned\n");
  47
  48 #ifdef __ia64__
  49 # define STACK_SIZE (256 * 1024)
  50 #else
  51 # define STACK_SIZE (128 * 1024)
  52 #endif
  53   char st[STACK_SIZE + 1];
  54   /* NB: Align child stack to 1 byte.  */
  55   char *stack = PTR_ALIGN_UP (&st[0], 2) + 1;
  56   struct clone_args clone_args =
  57     {
  58       .stack = (uintptr_t) stack,
  59       .stack_size = STACK_SIZE,
  60     };
  61   pid_t p = __clone_internal (&clone_args, check_stack_alignment, 0);
  62
  63   /* Clone must not fail.  */
  64   TEST_VERIFY_EXIT (p != -1);
  65
  66   int e;
  67   xwaitpid (p, &e, __WCLONE);
  68   TEST_VERIFY (WIFEXITED (e));
  69   TEST_COMPARE (WEXITSTATUS (e), 0);
  70
  71   return 0;
  72 }
  73
  74 #include <support/test-driver.c>