From owner-freebsd-hackers  Mon Jun  2 15:23:00 1997
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Message-ID: <19970603001148.DM01471@uriah.heep.sax.de>
Date: Tue, 3 Jun 1997 00:11:48 +0200
From: j@uriah.heep.sax.de (J Wunsch)
To: hackers@FreeBSD.ORG
Cc: bmcgover@cisco.com (Brian McGovern)
Subject: Re: Need help with pppd...
References: <199706022119.RAA00332@bmcgover-pc.cisco.com>
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Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
In-Reply-To: <199706022119.RAA00332@bmcgover-pc.cisco.com>; from Brian McGovern on Jun 2, 1997 17:19:11 -0400
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As Brian McGovern wrote:

> I guess the question I really have is this... With the other serial drivers,
> what keeps pppd from spinning completely out of control (if its not selecting/
> blocking on the async port)?

It _is_ selecting on the port.

/*
 * wait_input - wait until there is data available on fd,
 * for the length of time specified by *timo (indefinite
 * if timo is NULL).
 */
wait_input(timo)
    struct timeval *timo;
{
    fd_set ready;
    int n;

    FD_ZERO(&ready);
    FD_SET(fd, &ready);
    n = select(fd+1, &ready, NULL, &ready, timo);
    if (n < 0 && errno != EINTR) {
	syslog(LOG_ERR, "select: %m");
	die(1);
    }
}

-- 
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. ;-)