vbatts/mod_hello
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stubbing out reading from the /dev/helloctl

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based on reading ./arch/um/drivers/random.c
This commit is contained in:
Vincent Batts 2016-11-14 16:00:36 -05:00
parent 5eae9089e8
commit 80848e7688
1 changed files with 17 additions and 3 deletions
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20
mod_hello.c
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@ -25,13 +25,29 @@ hello_control_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return 0; return 0;
} }
static int
hello_control_open (struct inode *inode, struct file *filp)
{
return 0;
}
static ssize_t
hello_control_read (struct file *filp, char __user *buf, size_t size, loff_t *offp)
{
int ret = 0;
return ret;
}
static const struct file_operations hello_ctl_fops = { static const struct file_operations hello_ctl_fops = {
.unlocked_ioctl = hello_control_ioctl, .unlocked_ioctl = hello_control_ioctl,
.compat_ioctl = hello_control_ioctl, .compat_ioctl = hello_control_ioctl,
.owner = THIS_MODULE, .owner = THIS_MODULE,
.llseek = noop_llseek, .llseek = noop_llseek,
.open = hello_control_open,
.read = hello_control_read,
}; };
static struct miscdevice hello_misc = { static struct miscdevice hello_misc = {
.minor = MISC_DYNAMIC_MINOR, .minor = MISC_DYNAMIC_MINOR,
.name = "helloctl", .name = "helloctl",
@ -114,9 +130,7 @@ static int __init hello_init(void)
static void __exit hello_cleanup(void) static void __exit hello_cleanup(void)
{ {
if (misc_deregister(&hello_misc) < 0) { misc_deregister(&hello_misc);
printk(KERN_INFO "[%s] misc_deregister failed for control device.\n", __this_module.name);
}
printk(KERN_INFO "[%s] module unloaded.\n", __this_module.name); printk(KERN_INFO "[%s] module unloaded.\n", __this_module.name);
} }