| /* Check if clone (CLONE_THREAD) does not call exit_group (BZ #21512) |
| Copyright (C) 2017-2018 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 <string.h> |
| #include <sched.h> |
| #include <signal.h> |
| #include <unistd.h> |
| #include <sys/syscall.h> |
| #include <sys/wait.h> |
| #include <sys/types.h> |
| #include <linux/futex.h> |
| |
| #include <stackinfo.h> /* For _STACK_GROWS_{UP,DOWN}. */ |
| #include <support/check.h> |
| |
| /* Test if clone call with CLONE_THREAD does not call exit_group. The 'f' |
| function returns '1', which will be used by clone thread to call the |
| 'exit' syscall directly. If _exit is used instead, exit_group will be |
| used and thus the thread group will finish with return value of '1' |
| (where '2' from main thread is expected. */ |
| |
| static int |
| f (void *a) |
| { |
| return 1; |
| } |
| |
| /* Futex wait for TID argument, similar to pthread_join internal |
| implementation. */ |
| #define wait_tid(tid) \ |
| do { \ |
| __typeof (tid) __tid; \ |
| while ((__tid = (tid)) != 0) \ |
| futex_wait (&(tid), __tid); \ |
| } while (0) |
| |
| static inline int |
| futex_wait (int *futexp, int val) |
| { |
| return syscall (__NR_futex, futexp, FUTEX_WAIT, val); |
| } |
| |
| static int |
| do_test (void) |
| { |
| char st[1024] __attribute__ ((aligned)); |
| int clone_flags = CLONE_THREAD; |
| /* Minimum required flags to used along with CLONE_THREAD. */ |
| clone_flags |= CLONE_VM | CLONE_SIGHAND; |
| /* We will used ctid to call on futex to wait for thread exit. */ |
| clone_flags |= CLONE_CHILD_CLEARTID; |
| pid_t ctid, tid; |
| |
| #ifdef __ia64__ |
| extern int __clone2 (int (*__fn) (void *__arg), void *__child_stack_base, |
| size_t __child_stack_size, int __flags, |
| void *__arg, ...); |
| tid = __clone2 (f, st, sizeof (st), clone_flags, NULL, /* ptid */ NULL, |
| /* tls */ NULL, &ctid); |
| #else |
| #if _STACK_GROWS_DOWN |
| tid = clone (f, st + sizeof (st), clone_flags, NULL, /* ptid */ NULL, |
| /* tls */ NULL, &ctid); |
| #elif _STACK_GROWS_UP |
| tid = clone (f, st, clone_flags, NULL, /* ptid */ NULL, /* tls */ NULL, |
| &ctid); |
| #else |
| #error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP" |
| #endif |
| #endif |
| if (tid == -1) |
| FAIL_EXIT1 ("clone failed: %m"); |
| |
| ctid = tid; |
| wait_tid (ctid); |
| |
| return 2; |
| } |
| |
| #define EXPECTED_STATUS 2 |
| #include <support/test-driver.c> |