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Implement poll to make select work correctly #24

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Merged
merged 1 commit into from
Jul 18, 2025
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Implement poll to make select work correctly #24

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15 changes: 14 additions & 1 deletion main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
#include <linux/interrupt.h>
#include <linux/kfifo.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/version.h>
Expand Down Expand Up @@ -380,6 +381,18 @@ static void timer_handler(struct timer_list *__timer)
local_irq_enable();
}

static __poll_t kxo_poll(struct file *filp, struct poll_table_struct *wait)
{
__poll_t mask = 0;

poll_wait(filp, &rx_wait, wait);

if (kfifo_len(&rx_fifo))
mask |= EPOLLRDNORM | EPOLLIN;

return mask;
}

static ssize_t kxo_read(struct file *file,
char __user *buf,
size_t count,
Expand Down Expand Up @@ -449,7 +462,7 @@ static const struct file_operations kxo_fops = {
.llseek = no_llseek,
.open = kxo_open,
.release = kxo_release,
};
.poll = kxo_poll};

static int __init kxo_init(void)
{
Expand Down