Return to BSD News archive
Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!feed1.news.erols.com!cpk-news-hub1.bbnplanet.com!news.bbnplanet.com!cam-news-hub1.bbnplanet.com!news.mathworks.com!fu-berlin.de!irz401!orion.sax.de!uriah.heep!news From: j@uriah.heep.sax.de (J Wunsch) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: Almost in PPP land but something is odd. Date: 3 Jan 1997 21:18:07 GMT Organization: Private BSD site, Dresden Lines: 26 Message-ID: <5ajt2f$fnk@uriah.heep.sax.de> References: <32C707DF.5A75@eskimo.com> <5agh11$6fa@uriah.heep.sax.de> <32CC7F6D.2B8E@eskimo.com> Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) NNTP-Posting-Host: localhost.heep.sax.de Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Newsreader: knews 0.9.6 X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:33590 Enoch Wu <wue@eskimo.com> wrote: > > > SIGHUP > > > PPP terminated > > > > > > At that same instant, I noticed the modem dropped the DTR light. It is > > > as if PPP was telling the modem to drop DTR signal. Why ? > > > > No, ``SIGHUP'' means the modem dropped carrier. > But DTR is a control signal issued from the CPU. DTR signal always > flows from CPU to modem. Sure, but the logged ``SIGHUP'' shows that it was the modem dropping carrier. In the course, PPP closed the line, and this in turn takes DTR down. But this was already a few hundred milliseconds after your modem line broke. (If PPP had closed the line first, and therefore forced the hangup, it wouldn't have received a SIGHUP in turn, since the tty was already closed.) -- 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. ;-)