linux/fs/proc/interrupts.c
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   1#include <linux/fs.h>
   2#include <linux/init.h>
   3#include <linux/interrupt.h>
   4#include <linux/irqnr.h>
   5#include <linux/proc_fs.h>
   6#include <linux/seq_file.h>
   7
   8/*
   9 * /proc/interrupts
  10 */
  11static void *int_seq_start(struct seq_file *f, loff_t *pos)
  12{
  13        return (*pos <= nr_irqs) ? pos : NULL;
  14}
  15
  16static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
  17{
  18        (*pos)++;
  19        if (*pos > nr_irqs)
  20                return NULL;
  21        return pos;
  22}
  23
  24static void int_seq_stop(struct seq_file *f, void *v)
  25{
  26        /* Nothing to do */
  27}
  28
  29static const struct seq_operations int_seq_ops = {
  30        .start = int_seq_start,
  31        .next  = int_seq_next,
  32        .stop  = int_seq_stop,
  33        .show  = show_interrupts
  34};
  35
  36static int interrupts_open(struct inode *inode, struct file *filp)
  37{
  38        return seq_open(filp, &int_seq_ops);
  39}
  40
  41static const struct file_operations proc_interrupts_operations = {
  42        .open           = interrupts_open,
  43        .read           = seq_read,
  44        .llseek         = seq_lseek,
  45        .release        = seq_release,
  46};
  47
  48static int __init proc_interrupts_init(void)
  49{
  50        proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
  51        return 0;
  52}
  53module_init(proc_interrupts_init);
  54
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