elf/tst-align2.c

   1 /* Copyright (C) 2005-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Jakub Jelinek <jakub@redhat.com>, 2005.
   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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <stdbool.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <sys/wait.h>
  24 #include <tst-stack-align.h>
  25 #include <unistd.h>
  26
  27 static int res, fds[2], result;
  28 static bool test_destructors;
  29
  30 extern void in_dso (int *, bool *, int *);
  31
  32 static void __attribute__ ((constructor)) con (void)
  33 {
  34   res = TEST_STACK_ALIGN () ? -1 : 1;
  35 }
  36
  37 static void __attribute__ ((destructor)) des (void)
  38 {
  39   if (!test_destructors)
  40     return;
  41
  42   char c = TEST_STACK_ALIGN () ? 'B' : 'A';
  43   write (fds[1], &c, 1);
  44 }
  45
  46 static int
  47 do_test (void)
  48 {
  49   if (!res)
  50     {
  51       puts ("binary's constructor has not been run");
  52       result = 1;
  53     }
  54   else if (res != 1)
  55     {
  56       puts ("binary's constructor has been run without sufficient alignment");
  57       result = 1;
  58     }
  59
  60   if (TEST_STACK_ALIGN ())
  61     {
  62       puts ("insufficient stack alignment in do_test");
  63       result = 1;
  64     }
  65
  66   in_dso (&result, &test_destructors, &fds[1]);
  67
  68   if (pipe (fds) < 0)
  69     {
  70       printf ("couldn't create pipe: %m\n");
  71       return 1;
  72     }
  73
  74   pid_t pid = fork ();
  75   if (pid < 0)
  76     {
  77       printf ("fork failed: %m\n");
  78       return 1;
  79     }
  80
  81   if (!pid)
  82     {
  83       close (fds[0]);
  84       test_destructors = true;
  85       exit (0);
  86     }
  87
  88   close (fds[1]);
  89
  90   unsigned char c;
  91   ssize_t len;
  92   int des_seen = 0, dso_des_seen = 0;
  93   while ((len = TEMP_FAILURE_RETRY (read (fds[0], &c, 1))) > 0)
  94     {
  95       switch (c)
  96         {
  97         case 'B':
  98           puts ("insufficient alignment in binary's destructor");
  99           result = 1;
 100           /* FALLTHROUGH */
 101         case 'A':
 102           des_seen++;
 103           break;
 104         case 'D':
 105           puts ("insufficient alignment in DSO destructor");
 106           result = 1;
 107           /* FALLTHROUGH */
 108         case 'C':
 109           dso_des_seen++;
 110           break;
 111         default:
 112           printf ("unexpected character %x read from pipe", c);
 113           result = 1;
 114           break;
 115         }
 116     }
 117
 118   close (fds[0]);
 119
 120   if (des_seen != 1)
 121     {
 122       printf ("binary destructor run %d times instead of once\n", des_seen);
 123       result = 1;
 124     }
 125
 126   if (dso_des_seen != 1)
 127     {
 128       printf ("DSO destructor run %d times instead of once\n", dso_des_seen);
 129       result = 1;
 130     }
 131
 132   int status;
 133   pid_t termpid;
 134   termpid = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));
 135   if (termpid == -1)
 136     {
 137       printf ("waitpid failed: %m\n");
 138       result = 1;
 139     }
 140   else if (termpid != pid)
 141     {
 142       printf ("waitpid returned %ld != %ld\n",
 143               (long int) termpid, (long int) pid);
 144       result = 1;
 145     }
 146   else if (!WIFEXITED (status) || WEXITSTATUS (status))
 147     {
 148       puts ("child hasn't exited with exit status 0");
 149       result = 1;
 150     }
 151
 152   return result;
 153 }
 154
 155 #define TEST_FUNCTION do_test ()
 156 #include "../test-skeleton.c"