[poppler] UniqueFileStream and deleted files

[Ihar `Philips` Filipau]

On 3/23/13, Ihar `Philips` Filipau <thephilips at gmail.com> wrote:
>> (i tried to find a way to duplicate a FILE* but failed)
>
> How did you duplicate FILE*?
>
> How did the `fdopen( fileno(oldfile), mode )` failed?
>

Nope. This is the right way:

int new_fd = dup( fileno(oldfile) );
FILE *new_file = fdopen( new_fd, mode );

It is OK to use *NIX function here - the dup() - since deleting open
file can happen only on the *NIX-like OS, Mac OS X included. Windows
doesn't allow that. Correct me if I'm wrong. Tested on Linux, HP-UX
and Solaris for the safety sake: the fclose() would close the dup()ed
file descriptor.

Though I'm not sure how to integrate that with the rest of the portable code. :)

FYI.