r0 = openat$tcp_mem(0xffffffffffffff9c, &(0x7f0000000080)='/proc/sys/net/ipv4/tcp_wmem\x00', 0x1, 0x0)
pwritev(r0, &(0x7f0000000100)=[{&(0x7f00000000c0)="d3", 0x1}], 0x1, 0x2, 0x0)