| Title |
Testing the Scroll lock state |
| Ref. No. |
QNX.000009236 |
| Category(ies) |
Input Devices, Development, Character I/O |
| Issue |
How can we test the Numlock, Scroll lock, and/or Caps lock?
We found them defined in sys/qioctl.h but we are still not sure how to test if the state is "on" or "off".
|
| Solution |
Here's some code that should help(NOTE: The /dev/kbd can be changed to /dev/usbkbd0 to read from a usb keyboard.):
keystate.c
#ifdef __USAGE
keystate
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <ctype.h>
#include <termios.h>
#include <sys/dev.h>
#include <sys/qioctl.h>
#include <sys/kernel.h>
#include <term.h>
main(argc, argv)
int argc;
char *argv[];
{
int fd;
long lval[2];
struct termios tios;
if(tcgetattr(0, &tios) == -1) {
fprintf(stderr, "%s: Not a terminal devicen", argv[0]);
exit(EXIT_FAILURE);
}
fd = open("/dev/kbd", O_RDONLY);
/*
* Get state of keyboard numlock etc..
*/
lval[0] = 0;
lval[1] = 0;
if(qnx_ioctl( fd, QCTL_DEV_CTL, &lval[0], 8, &lval[0], 4 ) == 0 ) {
printf("%cnumlock", (lval[0] & 0x000002L) ? '+' : '-');
printf(" %ccapslock",(lval[0] & 0x000004L) ? '+' : '-');
printf(" %cscrlock", (lval[0] & 0x004001L) ? '+' : '-');
printf("n");
}
close(fd);
}
As well, you can query the state of the serial lines(in case anyone else is looking for this)
serline.c
#ifdef __USAGE
e.g. serline </dev/ser1
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <ctype.h>
#include <termios.h>
#include <sys/dev.h>
#include <sys/qioctl.h>
#include <sys/kernel.h>
#include <term.h>
main(argc, argv)
int argc;
char *argv[];
{
long lval[2];
struct termios tios;
if(tcgetattr(0, &tios) == -1) {
fprintf(stderr, "%s: Not a terminal devicen", argv[0]);
exit(EXIT_FAILURE);
}
/*
* Get state of hardware lines
*/
lval[0] = 0;
lval[1] = 0;
if(qnx_ioctl( 0, QCTL_DEV_CTL, &lval[0], 8, &lval[0], 4 ) == 0 ) {
printf("%cDTR", (lval[0] & 0x000001L) ? '+' : '-');
printf(" %cRTS", (lval[0] & 0x000002L) ? '+' : '-');
printf(" %cBRK", (lval[0] & 0x004000L) ? '+' : '-');
printf(" %ccts", (lval[0] & 0x100000L) ? '+' : '-');
printf(" %cdsr", (lval[0] & 0x200000L) ? '+' : '-');
printf(" %cri", (lval[0] & 0x400000L) ? '+' : '-');
printf(" %ccd", (lval[0] & 0x800000L) ? '+' : '-');
printf("n");
}
}
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