In message: <[EMAIL PROTECTED]> rashmi ns <[EMAIL PROTECTED]> writes: : Hello All , : I was trying to add a new ioctl cnd like : #define HDLCMODE _IOR('6',0xF,int) : when i try to uprintf the data which was sent from the user-space in the : device-driver-ioctl-routine i'll get a different value than which is passed. : Can anybody please tell me why this is happening . I pass the address of : integer from the user space as third arg to the ioctl call . : thanks and regards,
Remember that there's a level of indirection here. For the userland call, you'll have something like: int i = 10; ioctl (fd, HDLCMODE, &i); in the kernel, this translates into a call to the driver's ioctl routine: int fooioctl(struct cdev *tp, u_long cmd, void *data, int flag, struct thread *t) { switch (cmd) { case HDLCMODE: printf("this should be 10: %d\n", *(int *)data); break; } Warner _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"