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From: mcgrath@paris.Berkeley.EDU (Roland McGrath)
Newsgroups: comp.unix.wizards
Subject: Do a vfork parent and child share file descriptors?
Message-ID: <MCGRATH.89Jun10000537@paris.Berkeley.EDU>
Date: 10 Jun 89 07:05:37 GMT
Sender: news@pasteur.Berkeley.EDU
Organization: Hackers Anonymous International, Ltd., Inc. (Applications welcome)
Lines: 26

If I create a child with `vfork', memory is shared between the parent and
child.  What else is shared?  Are file descriptors shared?

What happens if I do:

if (vfork () == 0)
  {
    /* Child side.  */
    close (fd_created_above);    
    execve (...);
  }

/* Parent side.  */
...

What happens to `fd_created_above' in the parent.

I'm using a Sun 3 running Sun Unix 3.5, but I assume this is the same for all
4.2 BSD derivatives.

Please MAIL YOUR RESPONSE to roland@ai.mit.edu, and ONLY RESPOND IF YOU KNOW
WHAT YOU'RE TALKING ABOUT.
--
	Roland McGrath
	Free Software Foundation, Inc.
roland@ai.mit.edu, uunet!ai.mit.edu!roland