On Thu, Apr 25, 2019 at 03:00:10PM -0400, Joel Fernandes (Google) wrote: > > +void *test_pidfd_poll_exec_thread(void *priv) I think everything in this file can be static, there's this one and 3-4 below. > +int test_pidfd_poll_exec(int use_waitpid) > +{ > + int pid, pidfd = 0; > + int status, ret; > + pthread_t t1; > + time_t prog_start = time(NULL); > + const char *test_name = "pidfd_poll check for premature notification on child thread exec"; > + > + ksft_print_msg("Parent: pid: %d\n", getpid()); > + pid = pidfd_clone(CLONE_PIDFD, &pidfd, child_poll_exec_test); If pidfd_clone() fails here, I think things will go haywire below. > + ksft_print_msg("Parent: Waiting for Child (%d) to complete.\n", pid); > + > + if (use_waitpid) { > + ret = waitpid(pid, &status, 0); > + if (ret == -1) > + ksft_print_msg("Parent: error\n"); > + > + if (ret == pid) > + ksft_print_msg("Parent: Child process waited for.\n"); > + } else { > + poll_pidfd(test_name, pidfd); > + } > + > + time_t prog_time = time(NULL) - prog_start; > + > + ksft_print_msg("Time waited for child: %lu\n", prog_time); > + > + close(pidfd); > + > + if (prog_time < CHILD_THREAD_MIN_WAIT || prog_time > CHILD_THREAD_MIN_WAIT + 2) > + ksft_exit_fail_msg("%s test: Failed\n", test_name); > + else > + ksft_test_result_pass("%s test: Passed\n", test_name); > +} > + > +void *test_pidfd_poll_leader_exit_thread(void *priv) > +{ > + char waittime[256]; > + > + ksft_print_msg("Child Thread: starting. pid %d tid %d ; and sleeping\n", > + getpid(), syscall(SYS_gettid)); > + sleep(CHILD_THREAD_MIN_WAIT); > + ksft_print_msg("Child Thread: DONE. pid %d tid %d\n", getpid(), syscall(SYS_gettid)); > + return NULL; > +} > + > +static time_t *child_exit_secs; > +static int child_poll_leader_exit_test(void *args) > +{ > + pthread_t t1, t2; > + > + ksft_print_msg("Child: starting. pid %d tid %d\n", getpid(), syscall(SYS_gettid)); > + pthread_create(&t1, NULL, test_pidfd_poll_leader_exit_thread, NULL); > + pthread_create(&t2, NULL, test_pidfd_poll_leader_exit_thread, NULL); > + > + /* > + * glibc exit calls exit_group syscall, so explicity call exit only > + * so that only the group leader exits, leaving the threads alone. > + */ > + *child_exit_secs = time(NULL); > + syscall(SYS_exit, 0); > +} > + > +int test_pidfd_poll_leader_exit(int use_waitpid) > +{ > + int pid, pidfd = 0; > + int status, ret; > + time_t prog_start = time(NULL); > + const char *test_name = "pidfd_poll check for premature notification on non-empty" > + "group leader exit"; > + > + child_exit_secs = mmap(NULL, sizeof *child_exit_secs, PROT_READ | PROT_WRITE, > + MAP_SHARED | MAP_ANONYMOUS, -1, 0); > + > + ksft_print_msg("Parent: pid: %d\n", getpid()); > + pid = pidfd_clone(CLONE_PIDFD, &pidfd, child_poll_leader_exit_test); Same problem here, I think. Tycho