Package: manpages
Severity: normal
This description:
> KDGETLED
> Get state of LEDs. argp points to a long. The lower three bits
> of *argp are set to the state of the LEDs, as follows:
>
> LED_CAP 0x04 caps lock led
> LEC_NUM 0x02 num lock led
> LED_SCR 0x01 scroll lock led
is wrong. The kernel only stores a single byte *argp, so if you give it the
address of a long, you won't necessarily find the results in the low 3 bits
of the long. (It happens to work out that way if you are little-endian.)
Change "long" to "char" and the description will be correct.
Demonstration program (run it on a big-endian machine to see that the actual
behavior is not what the man page says):
#include <stdio.h>
#include <sys/ioctl.h>
#include <linux/kd.h>
int main(void)
{
int ioctlret;
long longval;
longval = -1;
ioctlret = ioctl(0, KDGETLED, &longval);
printf("ioctlret=%d longval=%08lx\n", ioctlret, longval);
return 0;
}
-- System Information:
Debian Release: 5.0
APT prefers stable
APT policy: (99, 'stable')
Architecture: powerpc (ppc)
Kernel: Linux 2.6.28.2
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/dash
manpages depends on no packages.
manpages recommends no packages.
Versions of packages manpages suggests:
ii man-db [man-browser] 2.5.2-4 on-line manual pager
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