elf/tst-align2.c

   1 /* Copyright (C) 2005-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <stdbool.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <sys/wait.h>
  23 #include <tst-stack-align.h>
  24 #include <unistd.h>
  25
  26 static int res, fds[2], result;
  27 static bool test_destructors;
  28
  29 extern void in_dso (int *, bool *, int *);
  30
  31 static void __attribute__ ((constructor)) con (void)
  32 {
  33   res = TEST_STACK_ALIGN () ? -1 : 1;
  34 }
  35
  36 static void __attribute__ ((destructor)) des (void)
  37 {
  38   if (!test_destructors)
  39     return;
  40
  41   char c = TEST_STACK_ALIGN () ? 'B' : 'A';
  42   write (fds[1], &c, 1);
  43 }
  44
  45 static int
  46 do_test (void)
  47 {
  48   if (!res)
  49     {
  50       puts ("binary's constructor has not been run");
  51       result = 1;
  52     }
  53   else if (res != 1)
  54     {
  55       puts ("binary's constructor has been run without sufficient alignment");
  56       result = 1;
  57     }
  58
  59   if (TEST_STACK_ALIGN ())
  60     {
  61       puts ("insufficient stack alignment in do_test");
  62       result = 1;
  63     }
  64
  65   in_dso (&result, &test_destructors, &fds[1]);
  66
  67   if (pipe (fds) < 0)
  68     {
  69       printf ("couldn't create pipe: %m\n");
  70       return 1;
  71     }
  72
  73   pid_t pid = fork ();
  74   if (pid < 0)
  75     {
  76       printf ("fork failed: %m\n");
  77       return 1;
  78     }
  79
  80   if (!pid)
  81     {
  82       close (fds[0]);
  83       test_destructors = true;
  84       exit (0);
  85     }
  86
  87   close (fds[1]);
  88
  89   unsigned char c;
  90   ssize_t len;
  91   int des_seen = 0, dso_des_seen = 0;
  92   while ((len = TEMP_FAILURE_RETRY (read (fds[0], &c, 1))) > 0)
  93     {
  94       switch (c)
  95         {
  96         case 'B':
  97           puts ("insufficient alignment in binary's destructor");
  98           result = 1;
  99           /* FALLTHROUGH */
 100         case 'A':
 101           des_seen++;
 102           break;
 103         case 'D':
 104           puts ("insufficient alignment in DSO destructor");
 105           result = 1;
 106           /* FALLTHROUGH */
 107         case 'C':
 108           dso_des_seen++;
 109           break;
 110         default:
 111           printf ("unexpected character %x read from pipe", c);
 112           result = 1;
 113           break;
 114         }
 115     }
 116
 117   close (fds[0]);
 118
 119   if (des_seen != 1)
 120     {
 121       printf ("binary destructor run %d times instead of once\n", des_seen);
 122       result = 1;
 123     }
 124
 125   if (dso_des_seen != 1)
 126     {
 127       printf ("DSO destructor run %d times instead of once\n", dso_des_seen);
 128       result = 1;
 129     }
 130
 131   int status;
 132   pid_t termpid;
 133   termpid = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));
 134   if (termpid == -1)
 135     {
 136       printf ("waitpid failed: %m\n");
 137       result = 1;
 138     }
 139   else if (termpid != pid)
 140     {
 141       printf ("waitpid returned %ld != %ld\n",
 142               (long int) termpid, (long int) pid);
 143       result = 1;
 144     }
 145   else if (!WIFEXITED (status) || WEXITSTATUS (status))
 146     {
 147       puts ("child hasn't exited with exit status 0");
 148       result = 1;
 149     }
 150
 151   return result;
 152 }
 153
 154 #include <support/test-driver.c>