"Where's the Beep?" (PCMCIA/vt_ioctl-s)

["B. D. Elliott" <bde@nwlink.com>]

On my old DELL LM laptop the -2.5 series no longer issues any beeps when
a card is inserted.  The problem is in the kernel, as the test program
below (extracted from cardmgr) beeps on -2.4, but not on -2.5.

===========================================================
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>

#define BEEP_TIME 150
#define BEEP_OK   1000
#define BEEP_WARN 2000
#define BEEP_ERR  4000

#include <sys/kd.h>

static void beep(unsigned int, unsigned int);

int
main(int argc, char **argv)
{
	beep(500, 1000);
	beep(500, 2000);
	beep(500, 4000);
	return 0;
}

static
void beep(unsigned int ms, unsigned int freq)
{
    int fd, arg;

    fd = open("/dev/tty0", O_RDWR);
    if (fd < 0)
	return;
    arg = (ms << 16) | freq;
    ioctl(fd, KDMKTONE, arg);
    close(fd);
    usleep(ms*1000);
}
===========================================================

-- 
B. D. Elliott   bde@nwlink.com