r0 = openat$tcp_mem(0xffffffffffffff9c, &(0x7f0000000240)='/proc/sys/net/ipv4/tcp_wmem\x00', 0x1, 0x0)
pwritev(r0, &(0x7f0000000880)=[{&(0x7f0000000280)="fc", 0x1}, {0x0, 0x2}], 0x2, 0x800, 0x40007f)