Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!haven!rutgers!att!ihlpe!opus
From: opus@ihlpe.ATT.COM (452is-Kim)
Newsgroups: comp.unix.wizards
Subject: Re: shell file descriptor programming (was: Unlinked temp files)
Summary: rewind with ksh
Message-ID: <4763@ihlpe.ATT.COM>
Date: 3 May 89 16:25:56 GMT
References: <871@marvin.Solbourne.COM> <1015@philmds.UUCP> <296@tree.UUCP>
Organization: AT&T Bell Laboratories - Naperville, Illinois
Lines: 30

In article <296@tree.UUCP>, stever@tree.UUCP (Steve Rudek) writes:
: In article <10944@bloom-beacon.MIT.EDU>, scs@adam.pika.mit.edu (Steve Summit) writes:
: : 	extern long int atol();
: : 	main(argc, argv) int argc; char *argv[];
: : 	{lseek(atoi(argv[1]), atol(argv[2]), atoi(argv[3]);}
: 
: Neither works under the ksh (Microport System V/AT 2.4) though both work
: under the bourne shell (tested with the shell script).  The ksh failure is
: absolutely silent.
: 
: ----------
: Steve Rudek  {ucbvax!ucdavis!csusac OR ames!pacbell!sactoh0} !tree!stever

I had the same problem when I tried it, but I figured out a solution:

	extern long	lseek();
	main()
	{
		return(lseek(0, 0L, 0));
	}

To use this program to rewind file descriptor 4, for example, you say:

	rewind <&4

I know it's not clean, but it works.  I suppose you could have a shell script
front end that takes an actual argument instead of a redirection.
-- 
						RoBiN G. KiM
						...att!ihlpe!opus