r0 = eventfd2(0x0, 0x0)
r1 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000600), 0x0, 0x0)
dup2(r1, r0)
readv(r0, &(0x7f0000000240)=[{&(0x7f0000000100)=""/137, 0x89}], 0x1)