cd-lock/unlock

[Shaya Potter <spotter@cs.columbia.edu>]

Perhaps other people have had similiar problem to me, in that the cd
tray on their laptop tends to get ejected easily (at least on my
thinkpad the button seems to be pressed easily).  I wrote this little
tiny program that when called as cd-lock (or cd-unlock) calls the
CDROM_LOCKDOOR ioctl with the appropriate integer value to lock and
unlock the appropriate device.

just compile it as gcc cd-door.c -o cd-lock

then cp cd-lock to cd-unlock, and then you can just call it as "cd-lock
device".

posting as others might fine usefull.  perhaps this already exists
somewhere, but a cursory check couldn't find it and it was quicker to
write it than to continue the search.




//Written by Shaya Potter <spotter@cs.columbia.edu>
//Placed in the Public Domain

#include <sys/ioctl.h>
#include <stdio.h>
#include <fcntl.h>
#include <linux/cdrom.h>
#include <string.h>

int main(int argc, char *argv[])
{
	int fd;
	int lock;

	char *cmd, *cmd1;

	cmd = argv[0];
	while (*cmd != 0) {
		if (*cmd == '/')
			cmd1 = cmd + 1;
		cmd++;
	}

	if (!strcmp(cmd1, "cd-lock"))
		lock = 1;
	else if (!strcmp(cmd1, "cd-unlock"))
		lock = 0;
	else {
		printf("program must be called cd-lock or cd-unlock\n");
		return 1;
	}

	if (argc != 2) {
		printf("not enough options\nUsage:\n\t%s device\n", cmd1);
		return 2;
	}
			

	if ((fd = open(argv[1], O_RDONLY)) <= 0) {
		perror("open failed");
		return 3;
	}

	if (ioctl(fd, CDROM_LOCKDOOR, lock)) {
		perror("ioctl failed");
		return 4;
	}
}