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Date: Sun, 12 Jan 1997 10:40:02 -0800 (PST)
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From: j@uriah.heep.sax.de (J Wunsch)
Subject: Re: bin/2466: telnet sleeps too much :-)
Reply-To: j@uriah.heep.sax.de (J Wunsch)
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The following reply was made to PR bin/2466; it has been noted by GNATS.

From: j@uriah.heep.sax.de (J Wunsch)
To: andrew@ugh.net.au
Cc: freebsd-gnats-submit@FreeBSD.ORG
Subject: Re: bin/2466: telnet sleeps too much :-)
Date: Sun, 12 Jan 1997 19:10:12 +0100

 As andrew@ugh.net.au wrote:
 
 > If you leave telnet idle and then type something it will say "sleep(5)
 > from telnet, after select". It will continue to work but it messes up
 > the screen.
 
 > >How-To-Repeat:
 > telnet somewhere and leave it idle for a while, come back to it and type.
 
 No, this is not generally repeatable.
 
 I suspect something special with your network setup.  Perhaps you add
 a debug printf to see what the actual error code is.
 
 The code in question (modulo some tn3720 hack) is:
 
     if ((c = select(16, &ibits, &obits, &xbits,
 			(poll == 0)? (struct timeval *)0 : &TimeValue)) < 0) {
 	if (c == -1) {
 		    /*
 		     * we can get EINTR if we are in line mode,
 		     * and the user does an escape (TSTP), or
 		     * some other signal generator.
 		     */
 	    if (errno == EINTR) {
 		return 0;
 	    }
 		    /* I don't like this, does it ever happen? */
 	    printf("sleep(5) from telnet, after select\r\n");
 	    sleep(5);
 	}
 	return 0;
     }
 
 ...so the sleep only happens after select() returned -1 (nothing
 found) but without EINTR.  This is a ``Cannot happen'' situation.
 Perhaps you can investigate a little why it happens in your
 environment.  (Mind you, many people leave telnet sessions idle for
 days.)
 
 -- 
 cheers, J"org
 
 joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
 Never trust an operating system you don't have sources for. ;-)