On 2017-04-25 14:17, Stefan Seyfried wrote:
On 25.04.2017 13:37, Carlos E. R. wrote:
On 2017-04-25 10:58, Stefan Seyfried wrote:
no, it does not change it in the boot loader. But the beeper is universal in that it works just everywhere -- console, bootloader, BIOS, even GTK programs! :-)
I use it for example on my home server to notify me of serious errors (file system, disk problems, stuff you'd rather notice sooner than later). Works very well as someone in my family will call me and complain that the box in the closet is issuing annoying beeps :-) Of course I could also use the sound card, add an amplifioer and play some wav file. But that's much more effort.
I tried to do that, but I found that a daemon can not beep: it needs having the terminal.
How did you do it?
(in C code) echo -en '\007' > /dev/tty1
or, to avoid the problem of "is a terminal there at all?" - open /dev/input/eventX corresponding to pcspkr - write struct input_event filled with EV_SND/SND_TONE/hz value into that file descriptor.
I want to try that someday, but I use Pascal (Lazarus), so I'll think how to translate that one day, so thanks :-) If you can point to some C code doing it, it would help, of course. Notes for later use: cat /proc/bus/input/devices I: Bus=0010 Vendor=001f Product=0001 Version=0100 N: Name="PC Speaker" P: Phys=isa0061/input0 S: Sysfs=/devices/platform/pcspkr/input/input6 U: Uniq= H: Handlers=kbd event3 B: PROP=0 B: EV=40001 B: SND=6 Mmm... https://bugs.freedesktop.org/show_bug.cgi?id=90826 http://2010-2014.itech-planet.net/content/reading-device-input-directly-from...
But usually, just writing (char)'\007' to a terminal is enough.
cer@Telcontar:~> echo -en '\007' > /dev/tty10 bash: /dev/tty10: Permission denied cer@Telcontar:~> Only works as root. Other terminals, depends on who owns each terminal. Or have user belong to group tty... -- Cheers / Saludos, Carlos E. R. (from 42.2 x86_64 "Malachite" at Telcontar)