This article was posted to the Usenet group alt.hackers in
1995; any technical information is probably outdated.
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File I/O hack...
Article: 7684 of alt.hackers From: dmescher@csugrad.cs.vt.edu (The Root of All Evil) Newsgroups: alt.hackers Subject: File I/O hack... Date: 19 Apr 1995 13:31:01 -0400 Organization: Virginia Tech Computer Science Dept, Blacksburg, VA Lines: 13 Approved: lucifer@hell.com Message-ID: 3n3hcl$1if@csugrad.cs.vt.edu NNTP-Posting-Host: csugrad.cs.vt.edu X-Newsreader: TIN [version 1.2 PL2] Status: RO
Problem: Wanted to redirect output to a file from the middle of a program,
and then go to stdout or the file at will w/o using fprintf. Dup
er dup() and dup2() weren't working.
Solution: Rip apart stdio.h and examine the FILE type. To do redirection
(under UNIX), modify the _file field of stdout to whatever the
_file field of the output file is. Doesn't work when the OS
redirects stdout, though. Any suggestions?
--
Dave Mescher dmescher@csugrad.cs.vt.edu
GCS d,++ H>+ s+:- g+ p3 au a-- w+ v,--->! C++++,++ UU++++,A$ P-- L-
3- E--- N++ K- W--- M V-- po Y+ t--- 5 jx R G+ !tv b++ D- B---
e+,* u+ h- f+ r(+,++)@ !n,--- y?
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