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/* Test driver for malloc interposition tests.
Copyright (C) 2016-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if INTERPOSE_THREADS
#include <pthread.h>
#endif
static int do_test (void);
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
/* Fills BUFFER with a test string. */
static void
line_string (int number, char *buffer, size_t length)
{
for (size_t i = 0; i < length - 2; ++i)
buffer[i] = 'A' + ((number + i) % 26);
buffer[length - 2] = '\n';
buffer[length - 1] = '\0';
}
/* Perform the tests. */
static void *
run_tests (void *closure)
{
char *temp_file_path;
int fd = create_temp_file ("tst-malloc-interpose", &temp_file_path);
if (fd < 0)
_exit (1);
/* Line lengths excluding the line terminator. */
static const int line_lengths[] = { 0, 45, 80, 2, 8201, 0, 17, -1 };
/* Fill the test file with data. */
{
FILE *fp = fdopen (fd, "w");
for (int lineno = 0; line_lengths[lineno] >= 0; ++lineno)
{
char buffer[line_lengths[lineno] + 2];
line_string (lineno, buffer, sizeof (buffer));
fprintf (fp, "%s", buffer);
}
if (ferror (fp))
{
printf ("error: fprintf: %m\n");
_exit (1);
}
if (fclose (fp) != 0)
{
printf ("error: fclose: %m\n");
_exit (1);
}
}
/* Read the test file. This tests libc-internal allocation with
realloc. */
{
FILE *fp = fopen (temp_file_path, "r");
char *actual = NULL;
size_t actual_size = 0;
for (int lineno = 0; ; ++lineno)
{
errno = 0;
ssize_t result = getline (&actual, &actual_size, fp);
if (result == 0)
{
printf ("error: invalid return value 0 from getline\n");
_exit (1);
}
if (result < 0 && errno != 0)
{
printf ("error: getline: %m\n");
_exit (1);
}
if (result < 0 && line_lengths[lineno] >= 0)
{
printf ("error: unexpected end of file after line %d\n", lineno);
_exit (1);
}
if (result > 0 && line_lengths[lineno] < 0)
{
printf ("error: no end of file after line %d\n", lineno);
_exit (1);
}
if (result == -1 && line_lengths[lineno] == -1)
/* End of file reached as expected. */
break;
if (result != line_lengths[lineno] + 1)
{
printf ("error: line length mismatch: expected %d, got %zd\n",
line_lengths[lineno], result);
_exit (1);
}
char expected[line_lengths[lineno] + 2];
line_string (lineno, expected, sizeof (expected));
if (strcmp (actual, expected) != 0)
{
printf ("error: line mismatch\n");
printf ("error: expected: [[%s]]\n", expected);
printf ("error: actual: [[%s]]\n", actual);
_exit (1);
}
}
if (fclose (fp) != 0)
{
printf ("error: fclose (after reading): %m\n");
_exit (1);
}
}
free (temp_file_path);
/* Make sure that fork is working. */
pid_t pid = fork ();
if (pid == -1)
{
printf ("error: fork: %m\n");
_exit (1);
}
enum { exit_code = 55 };
if (pid == 0)
_exit (exit_code);
int status;
int ret = waitpid (pid, &status, 0);
if (ret < 0)
{
printf ("error: waitpid: %m\n");
_exit (1);
}
if (!WIFEXITED (status) || WEXITSTATUS (status) != exit_code)
{
printf ("error: unexpected exit status from child process: %d\n",
status);
_exit (1);
}
return NULL;
}
/* This is used to detect if malloc has not been successfully
interposed. The interposed malloc does not use brk/sbrk. */
static void *initial_brk;
__attribute__ ((constructor))
static void
set_initial_brk (void)
{
initial_brk = sbrk (0);
}
/* Terminate the process if the break value has been changed. */
__attribute__ ((destructor))
static void
check_brk (void)
{
void *current = sbrk (0);
if (current != initial_brk)
{
printf ("error: brk changed from %p to %p; no interposition?\n",
initial_brk, current);
_exit (1);
}
}
static int
do_test (void)
{
check_brk ();
#if INTERPOSE_THREADS
pthread_t thr = xpthread_create (NULL, run_tests, NULL);
xpthread_join (thr);
#else
run_tests (NULL);
#endif
check_brk ();
return 0;
}
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