__WALL
LINUX_WCONTINUED | __WCLONE | __WNOTHREAD | __WALL))
LINUX_WSTOPPED | LINUX_WCONTINUED | __WCLONE | __WNOTHREAD | __WALL))
EXPECT_EQ(child, wait4(child, &status, __WALL, NULL));
EXPECT_EQ(firstborn, waitpid(firstborn, &status, __WALL));