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Move poll, ktrhead and kthreads docs to README

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Ciro Santilli
2018-07-01 20:01:49 +01:00
parent ae3c03bdb0
commit 2075fbaf5b
6 changed files with 490 additions and 407 deletions
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17
kernel_module/poll.c
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@@ -1,10 +1,4 @@
/*
/poll.sh
Outcome: user echoes jiffies every second.
https://stackoverflow.com/questions/30035776/how-to-add-poll-function-to-the-kernel-module-code/44645336#44645336
*/
/* https://github.com/cirosantilli/linux-kernel-module-cheat#poll */
#include <linux/debugfs.h>
#include <linux/delay.h> /* usleep_range */
@@ -40,11 +34,10 @@ static ssize_t read(struct file *filp, char __user *buf, size_t len, loff_t *off
return ret;
}
/*
If you return 0 here, then the kernel will sleep until an event happens in the queue.
This gets called again every time an event happens in the wait queue.
*/
/* If you return 0 here, then the kernel will sleep until an event happens in the queue.
*
* This gets called again every time an event happens in the wait queue.
*/
unsigned int poll(struct file *filp, struct poll_table_struct *wait)
{
poll_wait(filp, &waitqueue, wait);