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From: mjhammel@Kepler.dell.com (Michael J. Hammel)
Newsgroups: comp.unix.sysv386
Subject: Re: Berkley sockets
Message-ID: <16730@uudell.dell.com>
Date: 18 Mar 91 23:52:28 GMT
References: <1991Mar14.193619.21766@m.cs.uiuc.edu> <1991Mar13.190847.9755@watdragon.waterloo.edu> <1991Mar14.122151.21216@virtech.uucp>
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Reply-To: mjhammel@Kepler.dell.com (Michael J. Hammel)
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In article <1991Mar14.193619.21766@m.cs.uiuc.edu>, carroll@cs.uiuc.edu
(Alan M. Carroll) writes:
> A problem that I have had (2.0.2) with ISC is that if I have a socket
> that is a passive socket, and I poll() on it, waiting for input,
> poll() does _not_ return when another process connects to the socket
> (neither does select())..  This means that if I want to read/write on
> connected sockets _and_ listen for new connections, I lose.

Hmm.  Maybe I don't understand the problem, but how about doing it like this:

for (;;)             /* begin infinite loop waiting for new connections */
   {
   if ( (t=accept(s, &isa, &i) ) < 0) /* hang in accept, wait for new
connects*/
      {
	...error checking code
      }

   if ( (childpid=fork()) == 0) /* child process if fork() returns 0  */
      {
	...handle connection here in child process; the child inherits the socket
      }

   close(t);                    /* close the socket from the accept call */
   }


This should allow you to read/write on connected sockets in a child
process and wait for more connections in the parent.  You can specify
how many accepts can be queued with a listen() call, I believe.  This
seems to work in a simple application I wrote.


Michael J. Hammel        | mjhammel@{Kepler|socrates}.dell.com
Dell Computer Corp.      | {73377.3467|76424.3024}@compuserve.com
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