Messages in this thread | | | Date | Sun, 29 Jun 2008 06:42:36 +0300 | From | Avi Kivity <> | Subject | Re: Ctrl+C doesn't interrupt process waiting for I/O |
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Jeremy Fitzhardinge wrote: > Török Edwin wrote: >> Hi, >> >> I have encountered the following situation several times, but I've been >> unable to come up with a way to reproduce this until now: >> - some process is keeping the disk busy (some cron job for example: >> updatedb, chkrootkit, ...) >> - other processes that want to do I/O have to wait (this is normal) >> - 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 >> >> This issue occurs both on my x86-64 machine that uses reiserfs, and on >> my x86 machine that uses XFS, so it doesn't seem related to the >> underlying FS. >> I use 2.6.25-2 and 2.6.26-rc8 now; I don't recall seeing this behaviour >> with old kernels (IIRC I see this since 2.6.21 or 2.6.23). >> >> Is this intended behaviour, or should I report a bug? >> > > 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.
That's filesystem dependent; if you mount an nfs filesystem with the 'intr' mount option, it will be interruptible (which makes sense, as it is impossible to guarantee the server's responsiveness).
-- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.
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