Date: Thu, 29 Jun 1995 17:14:56 +0930 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: xxnguyen@utacnvx.uta.edu (Mr. TR Nguyen) Cc: freebsd-questions@FreeBSD.ORG Subject: Re: APC Backups 400 && ups daemon Message-ID: <199506290744.RAA22262@genesis.atrad.adelaide.edu.au> In-Reply-To: <199506290242.VAA22022@utacnvx.uta.edu> from "Mr. TR Nguyen" at Jun 28, 95 09:42:48 pm
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Mr. TR Nguyen stands accused of saying:
> I think hackers would be a more appropriate forum, but it's kind
> of swamped for the time being. Anyways, I have an A.P.C. Back-UPS 400
> with a serial connection to my FreeBSD 2.0.5R's comm port 3.
>
> I've unsuccessfully tried to write a simple program to read a single
> byte from this port (/dev/tty02) and check whether or not the "POWER-FAIL"
> bit has been raised (pin #4, according to the Owner's Manual)
Urk. You're confusing pin 4 (CTS) with bit #4 in a serial data stream.
> Anyone with examples/tips to share with this stumped-abuser?
Yup; try this :
int fd, status;
fd = open("/dev/tty2",O_RDONLY);
...
for(;;)
{
status = ioctl(fd, TIOCMGET, NULL);
if (status & TIOCM_CTS)
power_has_failed()
sleep(60);
}
Haven't tested it, but it ought to work 8)
Make sure you don't have a getty on the port at the same time.
> TR Nguyen
--
]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[
]] Genesis Software genesis@atrad.adelaide.edu.au [[
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