r0 = openat$tcp_mem(0xffffffffffffff9c, &(0x7f0000000000)='/proc/sys/net/ipv4/tcp_wmem\x00', 0x1, 0x0)
writev(r0, &(0x7f0000000600)=[{&(0x7f00000000c0)="fc", 0x1}], 0x1)