r0 = epoll_create1(0x0)
r1 = openat$tcp_mem(0xffffffffffffff9c, &(0x7f00000004c0)='/proc/sys/net/ipv4/tcp_rmem\x00', 0x1, 0x0)
epoll_ctl$EPOLL_CTL_ADD(r0, 0x1, r1, &(0x7f0000000500))
close(r0)