942 static int eligible_pid(struct wait_opts *wo, struct task_struct *p)  in eligible_pid()  argument
944 	return	wo->wo_type == PIDTYPE_MAX ||  in eligible_pid()
945 		task_pid_type(p, wo->wo_type) == wo->wo_pid;  in eligible_pid()
949 eligible_child(struct wait_opts *wo, bool ptrace, struct task_struct *p)  in eligible_child()  argument
951 	if (!eligible_pid(wo, p))  in eligible_child()
958 	if (ptrace || (wo->wo_flags & __WALL))  in eligible_child()
969 	if ((p->exit_signal != SIGCHLD) ^ !!(wo->wo_flags & __WCLONE))  in eligible_child()
981 static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)  in wait_task_zombie()  argument
988 	if (!likely(wo->wo_flags & WEXITED))  in wait_task_zombie()
991 	if (unlikely(wo->wo_flags & WNOWAIT)) {  in wait_task_zombie()
996 		if (wo->wo_rusage)  in wait_task_zombie()
997 			getrusage(p, RUSAGE_BOTH, wo->wo_rusage);  in wait_task_zombie()
1072 	if (wo->wo_rusage)  in wait_task_zombie()
1073 		getrusage(p, RUSAGE_BOTH, wo->wo_rusage);  in wait_task_zombie()
1076 	wo->wo_stat = status;  in wait_task_zombie()
1094 	infop = wo->wo_info;  in wait_task_zombie()
1140 static int wait_task_stopped(struct wait_opts *wo,  in wait_task_stopped()  argument
1151 	if (!ptrace && !(wo->wo_flags & WUNTRACED))  in wait_task_stopped()
1168 	if (!unlikely(wo->wo_flags & WNOWAIT))  in wait_task_stopped()
1189 	if (wo->wo_rusage)  in wait_task_stopped()
1190 		getrusage(p, RUSAGE_BOTH, wo->wo_rusage);  in wait_task_stopped()
1193 	if (likely(!(wo->wo_flags & WNOWAIT)))  in wait_task_stopped()
1194 		wo->wo_stat = (exit_code << 8) | 0x7f;  in wait_task_stopped()
1196 	infop = wo->wo_info;  in wait_task_stopped()
1212 static int wait_task_continued(struct wait_opts *wo, struct task_struct *p)  in wait_task_continued()  argument
1218 	if (!unlikely(wo->wo_flags & WCONTINUED))  in wait_task_continued()
1230 	if (!unlikely(wo->wo_flags & WNOWAIT))  in wait_task_continued()
1239 	if (wo->wo_rusage)  in wait_task_continued()
1240 		getrusage(p, RUSAGE_BOTH, wo->wo_rusage);  in wait_task_continued()
1243 	infop = wo->wo_info;  in wait_task_continued()
1245 		wo->wo_stat = 0xffff;  in wait_task_continued()
1264 static int wait_consider_task(struct wait_opts *wo, int ptrace,  in wait_consider_task()  argument
1278 	ret = eligible_child(wo, ptrace, p);  in wait_consider_task()
1288 			wo->notask_error = 0;  in wait_consider_task()
1318 				return wait_task_zombie(wo, p);  in wait_consider_task()
1341 		if (likely(!ptrace) || (wo->wo_flags & (WCONTINUED | WEXITED)))  in wait_consider_task()
1342 			wo->notask_error = 0;  in wait_consider_task()
1348 		wo->notask_error = 0;  in wait_consider_task()
1355 	ret = wait_task_stopped(wo, ptrace, p);  in wait_consider_task()
1364 	return wait_task_continued(wo, p);  in wait_consider_task()
1376 static int do_wait_thread(struct wait_opts *wo, struct task_struct *tsk)  in do_wait_thread()  argument
1381 		int ret = wait_consider_task(wo, 0, p);  in do_wait_thread()
1390 static int ptrace_do_wait(struct wait_opts *wo, struct task_struct *tsk)  in ptrace_do_wait()  argument
1395 		int ret = wait_consider_task(wo, 1, p);  in ptrace_do_wait()
1407 	struct wait_opts *wo = container_of(wait, struct wait_opts,  in child_wait_callback()  local
1411 	if (!eligible_pid(wo, p))  in child_wait_callback()
1414 	if ((wo->wo_flags & __WNOTHREAD) && wait->private != p->parent)  in child_wait_callback()
1426 static long do_wait(struct wait_opts *wo)  in do_wait()  argument
1431 	trace_sched_process_wait(wo->wo_pid);  in do_wait()
1433 	init_waitqueue_func_entry(&wo->child_wait, child_wait_callback);  in do_wait()
1434 	wo->child_wait.private = current;  in do_wait()
1435 	add_wait_queue(&current->signal->wait_chldexit, &wo->child_wait);  in do_wait()
1443 	wo->notask_error = -ECHILD;  in do_wait()
1444 	if ((wo->wo_type < PIDTYPE_MAX) &&  in do_wait()
1445 	   (!wo->wo_pid || !pid_has_task(wo->wo_pid, wo->wo_type)))  in do_wait()
1452 		retval = do_wait_thread(wo, tsk);  in do_wait()
1456 		retval = ptrace_do_wait(wo, tsk);  in do_wait()
1460 		if (wo->wo_flags & __WNOTHREAD)  in do_wait()
1466 	retval = wo->notask_error;  in do_wait()
1467 	if (!retval && !(wo->wo_flags & WNOHANG)) {  in do_wait()
1476 	remove_wait_queue(&current->signal->wait_chldexit, &wo->child_wait);  in do_wait()
1483 	struct wait_opts wo;  in kernel_waitid()  local
1530 	wo.wo_type	= type;  in kernel_waitid()
1531 	wo.wo_pid	= pid;  in kernel_waitid()
1532 	wo.wo_flags	= options;  in kernel_waitid()
1533 	wo.wo_info	= infop;  in kernel_waitid()
1534 	wo.wo_rusage	= ru;  in kernel_waitid()
1536 		wo.wo_flags |= WNOHANG;  in kernel_waitid()
1538 	ret = do_wait(&wo);  in kernel_waitid()
1582 	struct wait_opts wo;  in kernel_wait4()  local
1608 	wo.wo_type	= type;  in kernel_wait4()
1609 	wo.wo_pid	= pid;  in kernel_wait4()
1610 	wo.wo_flags	= options | WEXITED;  in kernel_wait4()
1611 	wo.wo_info	= NULL;  in kernel_wait4()
1612 	wo.wo_stat	= 0;  in kernel_wait4()
1613 	wo.wo_rusage	= ru;  in kernel_wait4()
1614 	ret = do_wait(&wo);  in kernel_wait4()
1616 	if (ret > 0 && stat_addr && put_user(wo.wo_stat, stat_addr))  in kernel_wait4()
1624 	struct wait_opts wo = {  in kernel_wait()  local
1631 	ret = do_wait(&wo);  in kernel_wait()
1632 	if (ret > 0 && wo.wo_stat)  in kernel_wait()
1633 		*stat = wo.wo_stat;  in kernel_wait()
1634 	put_pid(wo.wo_pid);  in kernel_wait()