|
node *inode, struct file *filp)
{
globalvar_count--;
return 0;
}
static ssize_t globalvar_read(struct file *filp, char *buf, size_t len, loff_t
*off)
{
if (down_interruptible(&sem))
{
return - ERESTARTSYS;
}
if (copy_to_user(buf, &global_var, sizeof(int)))
{
up(&sem);
return - EFAULT;
}
up(&sem);
return sizeof(int);
}
static ssize_t globalvar_write(struct file *filp, const char *buf, size_t len,
loff_t 页码：[1] [2] [3] [4] [5] [6] [7] 第5页、共7页 |
