957 static int eligible_pid(struct wait_opts *wo, struct task_struct *p)  in eligible_pid()  argument
959 	return	wo->wo_type == PIDTYPE_MAX ||  in eligible_pid()
960 		task_pid_type(p, wo->wo_type) == wo->wo_pid;  in eligible_pid()
964 eligible_child(struct wait_opts *wo, bool ptrace, struct task_struct *p)  in eligible_child()  argument
966 	if (!eligible_pid(wo, p))  in eligible_child()
973 	if (ptrace || (wo->wo_flags & __WALL))  in eligible_child()
984 	if ((p->exit_signal != SIGCHLD) ^ !!(wo->wo_flags & __WCLONE))  in eligible_child()
996 static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)  in wait_task_zombie()  argument
1003 	if (!likely(wo->wo_flags & WEXITED))  in wait_task_zombie()
1006 	if (unlikely(wo->wo_flags & WNOWAIT)) {  in wait_task_zombie()
1011 		if (wo->wo_rusage)  in wait_task_zombie()
1012 			getrusage(p, RUSAGE_BOTH, wo->wo_rusage);  in wait_task_zombie()
1087 	if (wo->wo_rusage)  in wait_task_zombie()
1088 		getrusage(p, RUSAGE_BOTH, wo->wo_rusage);  in wait_task_zombie()
1091 	wo->wo_stat = status;  in wait_task_zombie()
1109 	infop = wo->wo_info;  in wait_task_zombie()
1155 static int wait_task_stopped(struct wait_opts *wo,  in wait_task_stopped()  argument
1166 	if (!ptrace && !(wo->wo_flags & WUNTRACED))  in wait_task_stopped()
1183 	if (!unlikely(wo->wo_flags & WNOWAIT))  in wait_task_stopped()
1204 	if (wo->wo_rusage)  in wait_task_stopped()
1205 		getrusage(p, RUSAGE_BOTH, wo->wo_rusage);  in wait_task_stopped()
1208 	if (likely(!(wo->wo_flags & WNOWAIT)))  in wait_task_stopped()
1209 		wo->wo_stat = (exit_code << 8) | 0x7f;  in wait_task_stopped()
1211 	infop = wo->wo_info;  in wait_task_stopped()
1227 static int wait_task_continued(struct wait_opts *wo, struct task_struct *p)  in wait_task_continued()  argument
1233 	if (!unlikely(wo->wo_flags & WCONTINUED))  in wait_task_continued()
1245 	if (!unlikely(wo->wo_flags & WNOWAIT))  in wait_task_continued()
1254 	if (wo->wo_rusage)  in wait_task_continued()
1255 		getrusage(p, RUSAGE_BOTH, wo->wo_rusage);  in wait_task_continued()
1258 	infop = wo->wo_info;  in wait_task_continued()
1260 		wo->wo_stat = 0xffff;  in wait_task_continued()
1279 static int wait_consider_task(struct wait_opts *wo, int ptrace,  in wait_consider_task()  argument
1293 	ret = eligible_child(wo, ptrace, p);  in wait_consider_task()
1303 			wo->notask_error = 0;  in wait_consider_task()
1333 				return wait_task_zombie(wo, p);  in wait_consider_task()
1356 		if (likely(!ptrace) || (wo->wo_flags & (WCONTINUED | WEXITED)))  in wait_consider_task()
1357 			wo->notask_error = 0;  in wait_consider_task()
1363 		wo->notask_error = 0;  in wait_consider_task()
1370 	ret = wait_task_stopped(wo, ptrace, p);  in wait_consider_task()
1379 	return wait_task_continued(wo, p);  in wait_consider_task()
1391 static int do_wait_thread(struct wait_opts *wo, struct task_struct *tsk)  in do_wait_thread()  argument
1396 		int ret = wait_consider_task(wo, 0, p);  in do_wait_thread()
1405 static int ptrace_do_wait(struct wait_opts *wo, struct task_struct *tsk)  in ptrace_do_wait()  argument
1410 		int ret = wait_consider_task(wo, 1, p);  in ptrace_do_wait()
1422 	struct wait_opts *wo = container_of(wait, struct wait_opts,  in child_wait_callback()  local
1426 	if (!eligible_pid(wo, p))  in child_wait_callback()
1429 	if ((wo->wo_flags & __WNOTHREAD) && wait->private != p->parent)  in child_wait_callback()
1441 static long do_wait(struct wait_opts *wo)  in do_wait()  argument
1446 	trace_sched_process_wait(wo->wo_pid);  in do_wait()
1448 	init_waitqueue_func_entry(&wo->child_wait, child_wait_callback);  in do_wait()
1449 	wo->child_wait.private = current;  in do_wait()
1450 	add_wait_queue(&current->signal->wait_chldexit, &wo->child_wait);  in do_wait()
1458 	wo->notask_error = -ECHILD;  in do_wait()
1459 	if ((wo->wo_type < PIDTYPE_MAX) &&  in do_wait()
1460 	   (!wo->wo_pid || hlist_empty(&wo->wo_pid->tasks[wo->wo_type])))  in do_wait()
1467 		retval = do_wait_thread(wo, tsk);  in do_wait()
1471 		retval = ptrace_do_wait(wo, tsk);  in do_wait()
1475 		if (wo->wo_flags & __WNOTHREAD)  in do_wait()
1481 	retval = wo->notask_error;  in do_wait()
1482 	if (!retval && !(wo->wo_flags & WNOHANG)) {  in do_wait()
1491 	remove_wait_queue(&current->signal->wait_chldexit, &wo->child_wait);  in do_wait()
1515 	struct wait_opts wo;  in kernel_waitid()  local
1560 	wo.wo_type	= type;  in kernel_waitid()
1561 	wo.wo_pid	= pid;  in kernel_waitid()
1562 	wo.wo_flags	= options;  in kernel_waitid()
1563 	wo.wo_info	= infop;  in kernel_waitid()
1564 	wo.wo_rusage	= ru;  in kernel_waitid()
1565 	ret = do_wait(&wo);  in kernel_waitid()
1607 	struct wait_opts wo;  in kernel_wait4()  local
1633 	wo.wo_type	= type;  in kernel_wait4()
1634 	wo.wo_pid	= pid;  in kernel_wait4()
1635 	wo.wo_flags	= options | WEXITED;  in kernel_wait4()
1636 	wo.wo_info	= NULL;  in kernel_wait4()
1637 	wo.wo_stat	= 0;  in kernel_wait4()
1638 	wo.wo_rusage	= ru;  in kernel_wait4()
1639 	ret = do_wait(&wo);  in kernel_wait4()
1641 	if (ret > 0 && stat_addr && put_user(wo.wo_stat, stat_addr))  in kernel_wait4()