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From: Mariusz@fbits.ttank.com (Mariusz Stanczak)
Newsgroups: comp.sys.3b1
Subject: Re: want workaround for "dup2"
Keywords: dup2 3b1 unix-pc
Message-ID: <90@fbits.ttank.com>
Date: 18 Mar 91 07:52:22 GMT
References: <1270@hico2.UUCP>
Organization: Forth Bits
Lines: 33

In article <1270@hico2.UUCP>, kak@hico2.UUCP (Kris A. Kugel) writes:
> 
> Hummm... I don't seem to have "dup2" either.
> [...]
> Is there an easy way to provide dup2?

The following version was included with GNU `make'

dup2 (old, new)
     int old, new;
{
  int newfd;

  (void) close (new);
  newfd = fcntl (old, F_DUPFD, new);
  if (newfd == -1)
    return -1;

  if (newfd != new)
    {
      (void) close (newfd);
      errno = EMFILE;
      return -1;
    }

  return newfd;
}

-Mariusz
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