r0 = openat$tcp_mem(0xffffffffffffff9c, &(0x7f0000000080)='/proc/sys/net/ipv4/tcp_rmem\x00', 0x1, 0x0)
r1 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000000)='/proc/diskstats\x00', 0x0, 0x0)
sendfile(r0, r1, 0x0, 0x2)