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/* Copyright (C) 1998 by Ori Pomerantz */
/* device specifics, such as ioctl numbers and the
* major device file. */
#include "chardev.h"
#include /* open */
#include /* exit */
#include /* ioctl */
/* Functions for the ioctl calls */
ioctl_set_msg(int file_desc, char *message)
{
int ret_val;
ret_val = ioctl(file_desc, IOCTL_SET_MSG, message);
if (ret_val < 0) {
printf ("ioctl_set_msg failed:%d\n", ret_val);
exit(-1);
}
}
ioctl_get_msg(int file_desc)
{
int ret_val;
char message[100];
/* Warning - this is dangerous because we dont tell
* the kernel how far its allowed to write, so it
* might overflow the buffer. In a real production
* program, we would have used two ioctls - 页码：[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] 第17页、共19页 |
