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From Jeff Trawick <traw...@attglobal.net>
Subject Re: mmap bug?
Date Thu, 27 Feb 2003 13:41:26 GMT
Sander Striker wrote:

> Hi,
>
> Using mmap to gain some performance I stumbled across the following.
>
> $ touch empty_file
>
> ...
>
>   rv = apr_file_open(&f, "empty_file", ...)
>   rv = apr_file_info_get(&finfo, APR_FINFO_SIZE, f);
>   rv = apr_mmap_create(&mm, f, 0, finfo.size, APR_MMAP_READ, ...);
>
>   [so far rv == APR_SUCCESS the whole time]
>
>   rv = apr_mmap_delete(mm);
>
>   [failure, rv == 22 (EINVAL?)]
>
> My guess is that munmap doesn't like the 0 passed in for size.  It
> strikes me as odd though that mmap doesn't seem to care about that.
>
> Is there a known issue with mmapping 0 sized files?
>
> FYI, I'm on Linux 2.4.20, glibc 2.3.1.

does strace show that it is kernel behavior in question rather than 
something questionable that APR may be doing?


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