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

   1 /* Verify that the clone child stack is properly aligned.
   2    Copyright (C) 2021-2024 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 <tst-stack-align.h>
  27 #include <clone_internal.h>
  28 #include <support/xunistd.h>
  29 #include <support/check.h>
  30
  31 static int
  32 f (void *arg)
  33 {
  34   puts ("in f");
  35
  36   return TEST_STACK_ALIGN () ? 1 : 0;
  37 }
  38
  39 static int
  40 do_test (void)
  41 {
  42   puts ("in main");
  43
  44   if (TEST_STACK_ALIGN ())
  45     FAIL_EXIT1 ("stack alignment failed");
  46
  47 #define STACK_SIZE 128 * 1024
  48   char st[STACK_SIZE] __attribute__ ((aligned));
  49   struct clone_args clone_args =
  50     {
  51       .stack = (uintptr_t) st,
  52       .stack_size = sizeof (st),
  53     };
  54   pid_t p = __clone_internal (&clone_args, f, 0);
  55   TEST_VERIFY (p != -1);
  56
  57   int e;
  58   xwaitpid (p, &e, __WCLONE);
  59   TEST_VERIFY (WIFEXITED (e));
  60   TEST_COMPARE (WEXITSTATUS (e), 0);
  61   return 0;
  62 }
  63
  64 #include <support/test-driver.c>