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----- Original Message ----- From: <Valdis.Kletnieks@vt.edu> To: "linux-os (Dick Johnson)" <linux-os@analogic.com> Cc: "Haar János" <djani22@netcenter.hu>; <linux-kernel@vger.kernel.org> Sent: Monday, May 29, 2006 5:35 PM Subject: Re: How to send a break? On Mon, 29 May 2006 11:08:15 EDT, "linux-os (Dick Johnson)" said: > > On Sat, 27 May 2006, [iso-8859-2] Haar János wrote: > > > Hello, list, > > > > I wish to know, how to send a "BREAK" to trigger the sysreq functions on the > > serial line, using echo. > > > > I mean like this: > > > > #!/bin/bash > > echo "?BREAK?" >/dev/ttyS0 > > sleep 2 > > echo "m" >/dev/ttyS0 > > > > Thanks, > > Janos > > > > Can't you use /proc/sysrq-trigger? > That can be tricky if the other end of /dev/ttyS0 is plugged into a debugging > serial port on an embedded system where you don't have easy access to a shell. > Or for that matter, if you're trying to talk to the serial port on a non-embedded > system, which is too far into OOM thrashing for you to be able to get a > usable shell prompt..... This is for debugging an frozen X86_64 system! :-) Thanks, Janos - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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