Re: Ctrl+C doesn't interrupt process waiting for I/O

[David Newall <davidn@davidnewall.com>]

Jeremy Fitzhardinge wrote:
> Török Edwin wrote:
>> ...
>> - I have a (I/O bound) process running in my terminal, and I want to
>> interrupt it with Ctrl+C
>>  - I type Ctrl+C several times, and the process is not interrupted for
>> several seconds (10-30 secs)
>>  - if I type Ctrl+Z, and use kill %1 the process dies faster than
>> waiting for it to react to Ctrl+C  
>
> Yes, it's intended behaviour.  Filesystem IO syscalls are considered
> "fast" and are interruptible.  Usermode code can reasonably expect
> that file IO will never return EINTR.

This does not address the symptom that the process can be killed quicker
by sending a SIGTERM.  I've noticed the problem, too (2.6.25.)  I wonder
if it isn't some strangeness in the tty layer (hence the interrupt key
is slower than an explicitly sent signal.)