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/* Test of immutable data.
Copyright (C) 2021-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2021. */
#include <config.h>
#include "immutable.h"
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include "macros.h"
struct data
{
int x;
long y;
};
#if IMMUTABLE_EFFECTIVE
static _GL_ASYNC_SAFE _Noreturn void
segv_handler (int signo)
{
_Exit (0);
}
static void
install_segv_handler (void)
{
signal (SIGSEGV, segv_handler);
# if (defined __APPLE__ && defined __MACH__) || defined __FreeBSD__
signal (SIGBUS, segv_handler);
# endif
}
#endif
int
main (int argc, char *argv[])
{
if (argc != 2)
{
fprintf (stderr, "%s: need 1 argument\n", argv[0]);
return 1;
}
int test = atoi (argv[1]);
switch (test)
{
case 0:
/* Indicates whether the implementation effectively rejects writes to
immutable data. */
#if !IMMUTABLE_EFFECTIVE
fputs ("Skipping test: immutability cannot be enforced\n", stderr);
return 77;
#else
break;
#endif
case 1:
/* Correct use of immmalloc. */
{
struct data *wp;
struct data const *p;
wp = (struct data *) immmalloc (sizeof (struct data));
ASSERT (wp != NULL);
wp->x = 7;
wp->y = 42;
p = immfreeze (wp);
ASSERT (p->x == 7);
ASSERT (p->y == 42);
immfree (p);
}
break;
case 2:
/* Catch invalid write access. */
{
struct data *wp;
struct data const *p;
wp = (struct data *) immmalloc (sizeof (struct data));
ASSERT (wp != NULL);
wp->x = 7;
wp->y = 42;
p = immfreeze (wp);
#if IMMUTABLE_EFFECTIVE
install_segv_handler ();
#endif
/* This assignment should crash. */
((struct data *) p)->y = 77;
#if IMMUTABLE_EFFECTIVE
return 1;
#endif
}
break;
case 3:
/* Catch invalid write access while another data object is not frozen. */
{
struct data *wp;
struct data const *p;
struct data *wp2;
wp = (struct data *) immmalloc (sizeof (struct data));
ASSERT (wp != NULL);
wp->x = 7;
wp->y = 42;
p = immfreeze (wp);
ASSERT (p->x == 7);
ASSERT (p->y == 42);
wp2 = (struct data *) immmalloc (sizeof (struct data));
ASSERT (wp2 != NULL);
wp2->x = 7;
#if IMMUTABLE_EFFECTIVE
install_segv_handler ();
#endif
/* This assignment should crash. */
((struct data *) p)->y = 42;
#if IMMUTABLE_EFFECTIVE
return 1;
#endif
}
break;
case 4:
/* Correct use of immstrdup. */
{
const char *s = immstrdup ("Hello");
ASSERT (strlen (s) == 5);
ASSERT (strcmp (s, "Hello") == 0);
immfree (s);
}
break;
default:
ASSERT (false);
}
return 0;
}
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