r0 = openat$hwrng(0xffffffffffffff9c, &(0x7f0000000080), 0x0, 0x0)
preadv(r0, &(0x7f0000001440)=[{&(0x7f0000000200)=""/4096, 0x1000}], 0x1, 0x0, 0x0)