r0 = openat$tcp_congestion(0xffffffffffffff9c, &(0x7f0000000200), 0x1, 0x0)
pwritev(r0, &(0x7f0000000040)=[{&(0x7f00000000c0)="a9", 0x1}], 0x1, 0x7fff, 0x0)