```
making the SIGINT handler (the terminate() function) safe to execute at
any interruption moment. This fixes a race in
5807f35c541c26bbd91a3ae12506cd8dd8f20688 where SIGINT delivered right
after the check_terminate() but before a blocking syscall would not
cause abort.
Do it by setting the in_io flag around potentially blocking io syscalls.
If handler sees the flag, it terminates the program. Otherwise,
termination is delegated to the before_io/after_io fences.
```