On Sun, Nov 23, 2003 at 06:34:26PM +0100, Jean Delvare wrote:
> Hi all,
>
> As I was investigating the long running "sensors: run as root?" issue, I
> found something strange. There is a mysterious sysctl call before and
> after reading the /etc/sensors.conf file. See:
>
> open("/etc/sensors.conf", O_RDONLY) = 3
> (...)
> ioctl(3, TCGETS, 0xbfffe6f8) = -1 ENOTTY (Inappropriate ioctl
> for device)
> (...)
> ioctl(3, TCGETS, 0xbfffe6c8) = -1 ENOTTY (Inappropriate ioctl
> for device)
>
> I was unable to find where in the code we do that, but I suspect that
> this is in lex/yacc generated code (which is simply unreadable). Does
> anyone have an explanation? What's that "TCGETS" supposed to do, and why
> is it failing?
It gets the current termios settings for the device. It should only
succeed if called on a serial port node. I have no idea why it's being
called on a file handle that is not a serial port. It's possibly a
thing that glibc does to determine what kind of file it has opened up.
greg k-h
