r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f00000000c0), 0x0, 0x0)
ioctl$TIOCVHANGUP(r0, 0x5437, 0x0)
readv(r0, &(0x7f0000001440)=[{&(0x7f0000000240)=""/249, 0xf9}], 0x1)