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| Author |
mmap and I/O error
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| Sakagami Hiroki 2005-10-30, 7:56 am |
| Hi,
When I open() a file on the disk and perform read() / write()
operations on the descriptor, I can detect a physical disk
I/O error by checking the return code and errno.
But when I mmap() a file on the disk and perform memcpy() on
the mapped area, how do I know whether a disk error occurs?
Regards,
--
Sakagami Hiroki
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| Maxim Yegorushkin 2005-10-30, 7:00 pm |
| Sakagami Hiroki wrote:
> Hi,
>
> When I open() a file on the disk and perform read() / write()
> operations on the descriptor, I can detect a physical disk
> I/O error by checking the return code and errno.
If O_SYNC has not been specified while opening the file, the return
code does not tell you if a physical error has occured.
> But when I mmap() a file on the disk and perform memcpy() on
> the mapped area, how do I know whether a disk error occurs?
You'll get a signal. Not sure which, probably SIGSEGV or SIGBUS.
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