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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 <sys/syscall.h>
#include <stackinfo.h> /* For _STACK_GROWS_{UP,DOWN}. */
static int do_test (void);
#define TEST_FUNCTION do_test ()
#include <test-skeleton.c>
static int sig;
static int pipefd[2];
static int
f (void *a)
{
close (pipefd[0]);
pid_t ppid = getppid ();
pid_t pid = getpid ();
pid_t tid = syscall (__NR_gettid);
if (write (pipefd[1], &ppid, sizeof ppid) != sizeof (ppid))
FAIL_EXIT1 ("write ppid failed\n");
if (write (pipefd[1], &pid, sizeof pid) != sizeof (pid))
FAIL_EXIT1 ("write pid failed\n");
if (write (pipefd[1], &tid, sizeof tid) != sizeof (tid))
FAIL_EXIT1 ("write tid failed\n");
return 0;
}
static int
do_test (void)
{
sig = SIGRTMIN;
sigset_t ss;
sigemptyset (&ss);
sigaddset (&ss, sig);
if (sigprocmask (SIG_BLOCK, &ss, NULL) != 0)
FAIL_EXIT1 ("sigprocmask failed: %m");
if (pipe2 (pipefd, O_CLOEXEC))
FAIL_EXIT1 ("pipe failed: %m");
int clone_flags = 0;
#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)
FAIL_EXIT1("clone failed: %m");
pid_t ppid, pid, tid;
if (read (pipefd[0], &ppid, sizeof pid) != sizeof pid)
{
kill (p, SIGKILL);
FAIL_EXIT1 ("read ppid failed: %m");
}
if (read (pipefd[0], &pid, sizeof pid) != sizeof pid)
{
kill (p, SIGKILL);
FAIL_EXIT1 ("read pid failed: %m");
}
if (read (pipefd[0], &tid, sizeof tid) != sizeof tid)
{
kill (p, SIGKILL);
FAIL_EXIT1 ("read tid failed: %m");
}
close (pipefd[0]);
int ret = 0;
pid_t own_pid = getpid ();
pid_t own_tid = syscall (__NR_gettid);
/* Some sanity checks for clone syscall: returned ppid should be current
pid and both returned tid/pid should be different from current one. */
if ((ppid != own_pid) || (pid == own_pid) || (tid == own_tid))
FAIL_RET ("ppid=%i pid=%i tid=%i | own_pid=%i own_tid=%i",
(int)ppid, (int)pid, (int)tid, (int)own_pid, (int)own_tid);
int e;
if (waitpid (p, &e, __WCLONE) != p)
{
kill (p, SIGKILL);
FAIL_EXIT1 ("waitpid failed");
}
if (!WIFEXITED (e))
{
if (WIFSIGNALED (e))
printf ("died from signal %s\n", strsignal (WTERMSIG (e)));
else
puts ("did not terminate correctly");
exit (EXIT_FAILURE);
}
if (WEXITSTATUS (e) != 0)
FAIL_EXIT1 ("exit code %d", WEXITSTATUS (e));
return ret;
}
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