#include <linux/module.h>
+/* Needed for procfs register functions */
#include <linux/proc_fs.h>
+/* Needed for using the seq_file infrastructure */
#include <linux/seq_file.h>
MODULE_AUTHOR("Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>");
MODULE_LICENSE("GPL");
+/* write our message to the sequential file */
static int hello_show(struct seq_file *file, void *data)
{
seq_puts(file, "Hello, world!\n");
return 0;
}
+/* use the single sequential file */
static int hello_procfs_open(struct inode *inode, struct file *file)
{
return single_open(file, hello_show, NULL);
}
+/* our file operations use the seq_file stuff to make it an easy task */
static const struct file_operations hello_procfs_fops =
{
.open = hello_procfs_open,
static int hello_procfs_init(void)
{
+ /* create the proc entry and set its fops: there is a potential race
+ * here */
struct proc_dir_entry *entry;
entry = create_proc_entry("gnu", 0666, NULL);
entry->proc_fops = &hello_procfs_fops;
static void hello_procfs_exit(void)
{
+ /* remove our proc entry */
remove_proc_entry("gnu", NULL);
}