socketpair$unix(0x1, 0x1, 0x0, &(0x7f0000000040)={<r0=>0xffffffffffffffff, <r1=>0xffffffffffffffff})
pipe(&(0x7f0000000580)={0xffffffffffffffff, <r2=>0xffffffffffffffff})
writev(r0, &(0x7f0000000000)=[{&(0x7f0000000080)='z', 0x1}], 0x1)
splice(r1, 0x0, r2, 0x0, 0x3, 0x0)