CHECK_FCNTL
int fd_flag = CHECK_FCNTL(CAP_FCNTL, caps, F_GETFL, 0);
EXPECT_EQ(0, CHECK_FCNTL(CAP_FCNTL, caps, F_SETFL, fd_flag));
int owner = CHECK_FCNTL(CAP_FCNTL, sock_caps, F_GETOWN, 0);
EXPECT_EQ(0, CHECK_FCNTL(CAP_FCNTL, sock_caps, F_SETOWN, owner));
EXPECT_EQ(0, CHECK_FCNTL(CAP_FLOCK, caps, F_GETLK, (long)&fl));