66 	char c = PARENT_TOKEN;  in sync_with_child()  local
68 	FAIL_IF(write(write_pipe.write_fd, &c, 1) != 1);  in sync_with_child()
69 	FAIL_IF(read(read_pipe.read_fd, &c, 1) != 1);  in sync_with_child()
70 	if (c != CHILD_TOKEN) /* sometimes expected */  in sync_with_child()
78 	char c;  in wait_for_parent()  local
80 	FAIL_IF(read(read_pipe.read_fd, &c, 1) != 1);  in wait_for_parent()
81 	FAIL_IF(c != PARENT_TOKEN);  in wait_for_parent()
88 	char c = CHILD_TOKEN;  in notify_parent()  local
90 	FAIL_IF(write(write_pipe.write_fd, &c, 1) != 1);  in notify_parent()
97 	char c = ~CHILD_TOKEN;  in notify_parent_of_error()  local
99 	FAIL_IF(write(write_pipe.write_fd, &c, 1) != 1);  in notify_parent_of_error()