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/* Test if CLONE_VM does not change pthread pid/tid field (BZ #19957)
Copyright (C) 2016 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
<http://www.gnu.org/licenses/>. */
#include <sched.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stddef.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <tls.h> /* for THREAD_* macros. */
static int sig;
static int pipefd[2];
static int
f (void *a)
{
close (pipefd[0]);
pid_t pid = THREAD_GETMEM (THREAD_SELF, pid);
pid_t tid = THREAD_GETMEM (THREAD_SELF, tid);
while (write (pipefd[1], &pid, sizeof pid) < 0)
continue;
while (write (pipefd[1], &tid, sizeof tid) < 0)
continue;
return 0;
}
static int
clone_test (int clone_flags)
{
sig = SIGRTMIN;
sigset_t ss;
sigemptyset (&ss);
sigaddset (&ss, sig);
if (sigprocmask (SIG_BLOCK, &ss, NULL) != 0)
{
printf ("sigprocmask failed: %m\n");
return 1;
}
if (pipe2 (pipefd, O_CLOEXEC))
{
printf ("sigprocmask failed: %m\n");
return 1;
}
pid_t ppid = getpid ();
#ifdef __ia64__
extern int __clone2 (int (*__fn) (void *__arg), void *__child_stack_base,
size_t __child_stack_size, int __flags,
void *__arg, ...);
char st[256 * 1024] __attribute__ ((aligned));
pid_t p = __clone2 (f, st, sizeof (st), clone_flags, 0);
#else
char st[128 * 1024] __attribute__ ((aligned));
#if _STACK_GROWS_DOWN
pid_t p = clone (f, st + sizeof (st), clone_flags, 0);
#elif _STACK_GROWS_UP
pid_t p = clone (f, st, clone_flags, 0);
#else
#error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
#endif
#endif
close (pipefd[1]);
if (p == -1)
{
printf ("clone failed: %m\n");
return 1;
}
pid_t pid, tid;
if (read (pipefd[0], &pid, sizeof pid) != sizeof pid)
{
printf ("read pid failed: %m\n");
kill (p, SIGKILL);
return 1;
}
if (read (pipefd[0], &tid, sizeof tid) != sizeof tid)
{
printf ("read pid failed: %m\n");
kill (p, SIGKILL);
return 1;
}
close (pipefd[0]);
int ret = 0;
/* For CLONE_VM glibc clone implementation does not change the pthread
pid/tid field. */
if ((clone_flags & CLONE_VM) == CLONE_VM)
{
if ((ppid != pid) || (ppid != tid))
{
printf ("parent pid (%i) != received pid/tid (%i/%i)\n",
(int)ppid, (int)pid, (int)tid);
ret = 1;
}
}
/* For any other flag clone updates the new pthread pid and tid with
the clone return value. */
else
{
if ((p != pid) || (p != tid))
{
printf ("child pid (%i) != received pid/tid (%i/%i)\n",
(int)p, (int)pid, (int)tid);
ret = 1;
}
}
int e;
if (waitpid (p, &e, __WCLONE) != p)
{
puts ("waitpid failed");
kill (p, SIGKILL);
return 1;
}
if (!WIFEXITED (e))
{
if (WIFSIGNALED (e))
printf ("died from signal %s\n", strsignal (WTERMSIG (e)));
else
puts ("did not terminate correctly");
return 1;
}
if (WEXITSTATUS (e) != 0)
{
printf ("exit code %d\n", WEXITSTATUS (e));
return 1;
}
return ret;
}
int
do_test (void)
{
/* First, check that the clone implementation, without any flag, updates
the struct pthread to contain the new PID and TID. */
int ret = clone_test (0);
/* Second, check that with CLONE_VM the struct pthread PID and TID fields
remain unmodified after the clone. Any modifications would cause problem
for the parent as described in bug 19957. */
ret += clone_test (CLONE_VM);
return ret;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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