Re: libc6 bug? or C programming error?
On Wed, 2003-12-03 at 00:52, viro@parcelfarce.linux.theplanet.co.uk
wrote:
> > /* map the file and load an extra page in case the new line expands the
> > file across the page boundary; adding 2 allows for the truncating
> > effect of integer division. Forcing an extra page ensures
> > that we can identify the end of the buffer by finding a NUL */
>
> No, it does not. Access past the EOF will give you page fault, not zero-filled
> page.
Do you think that is connected with this problem? There is no error
when the mmap() call was executed; the segfault occurs a little later,
as the trace shows.
Does that mean you cannot use mmap() and related calls to extend the
length of a file?
> > if ((int)(buf = (char *) mmap(buf, ((c / getpagesize()) + 2) * getpagesize(),
> > PROT_NONE, MAP_SHARED, fileno(ucf), 0)) == -1) {
> > perror("Could not map user_clusters");
> > exit(LOC_ERR_READ_FAIL);
> > }
--
Oliver Elphick Oliver.Elphick@lfix.co.uk
Isle of Wight, UK http://www.lfix.co.uk/oliver
GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839 932A 614D 4C34 3E1D 0C1C
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"What shall we then say to these things? If God be for
us, who can be against us?" Romans 8:31
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