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/* Test program for POSIX shm_* functions.
Copyright (C) 2000-2022 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; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/wait.h>
/* We want to see output immediately. */
#define STDOUT_UNBUFFERED
static char shm_test_name[sizeof "/glibc-shm-test-" + sizeof (pid_t) * 3];
static char shm_escape_name[sizeof "/../escaped-" + sizeof (pid_t) * 3];
static void
init_shm_test_names (void)
{
snprintf (shm_test_name, sizeof (shm_test_name), "/glibc-shm-test-%u",
getpid ());
snprintf (shm_escape_name, sizeof (shm_escape_name), "/../escaped-%u",
getpid ());
}
static void
worker (int write_now)
{
struct timespec ts;
struct stat64 st;
int i;
int fd = shm_open (shm_test_name, O_RDWR, 0600);
if (fd == -1)
error (EXIT_FAILURE, 0, "failed to open shared memory object: shm_open");
char *mem;
if (fd == -1)
exit (fd);
if (fstat64 (fd, &st) == -1)
error (EXIT_FAILURE, 0, "stat failed");
if (st.st_size != 4000)
error (EXIT_FAILURE, 0, "size incorrect");
mem = mmap (NULL, 4000, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (mem == MAP_FAILED)
error (EXIT_FAILURE, 0, "mmap failed");
ts.tv_sec = 0;
ts.tv_nsec = 500000000;
if (write_now)
for (i = 0; i <= 4; ++i)
mem[i] = i;
else
/* Wait until the first bytes of the memory region are 0, 1, 2, 3, 4. */
while (1)
{
for (i = 0; i <= 4; ++i)
if (mem[i] != i)
break;
if (i > 4)
/* OK, that's done. */
break;
nanosleep (&ts, NULL);
}
if (!write_now)
for (i = 0; i <= 4; ++i)
mem[i] = 4 + i;
else
/* Wait until the first bytes of the memory region are 4, 5, 6, 7, 8. */
while (1)
{
for (i = 0; i <= 4; ++i)
if (mem[i] != 4 + i)
break;
if (i > 4)
/* OK, that's done. */
break;
nanosleep (&ts, NULL);
}
if (munmap (mem, 4000) == -1)
error (EXIT_FAILURE, errno, "munmap");
close (fd);
exit (0);
}
static int
do_test (void)
{
int fd;
pid_t pid1;
pid_t pid2;
int status1;
int status2;
struct stat64 st;
init_shm_test_names ();
fd = shm_open (shm_escape_name, O_RDWR | O_CREAT | O_TRUNC | O_EXCL, 0600);
if (fd != -1)
{
perror ("read file outside of SHMDIR directory");
return 1;
}
/* Create the shared memory object. */
fd = shm_open (shm_test_name, O_RDWR | O_CREAT | O_TRUNC | O_EXCL, 0600);
if (fd == -1)
{
/* If shm_open is unimplemented we skip the test. */
if (errno == ENOSYS)
{
perror ("shm_open unimplemented. Test skipped.");
return 0;
}
else
error (EXIT_FAILURE, 0, "failed to create shared memory object: shm_open");
}
/* Size the object. We make it 4000 bytes long. */
if (ftruncate (fd, 4000) == -1)
{
/* This failed. Must be a bug in the implementation of the
shared memory itself. */
perror ("failed to size of shared memory object: ftruncate");
close (fd);
shm_unlink (shm_test_name);
return 0;
}
if (fstat64 (fd, &st) == -1)
{
shm_unlink (shm_test_name);
error (EXIT_FAILURE, 0, "initial stat failed");
}
if (st.st_size != 4000)
{
shm_unlink (shm_test_name);
error (EXIT_FAILURE, 0, "initial size not correct");
}
/* Spawn to processes which will do the work. */
pid1 = fork ();
if (pid1 == 0)
worker (0);
else if (pid1 == -1)
{
/* Couldn't create a second process. */
perror ("fork");
close (fd);
shm_unlink (shm_test_name);
return 0;
}
pid2 = fork ();
if (pid2 == 0)
worker (1);
else if (pid2 == -1)
{
/* Couldn't create a second process. */
int ignore;
perror ("fork");
kill (pid1, SIGTERM);
waitpid (pid1, &ignore, 0);
close (fd);
shm_unlink (shm_test_name);
return 0;
}
/* Wait until the two processes are finished. */
waitpid (pid1, &status1, 0);
waitpid (pid2, &status2, 0);
/* Now we can unlink the shared object. */
shm_unlink (shm_test_name);
return (!WIFEXITED (status1) || WEXITSTATUS (status1) != 0
|| !WIFEXITED (status2) || WEXITSTATUS (status2) != 0);
}
static void
cleanup_handler (void)
{
shm_unlink (shm_test_name);
}
#define CLEANUP_HANDLER cleanup_handler
#include <support/test-driver.c>
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