From: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Date: Sat, 5 Dec 2009 14:26:00 +0000 (-0200)
Subject: Implement procfs demonstration.
X-Git-Url: http://git.cascardo.eti.br/?p=cascardo%2Fkernel%2Fsamples%2F03.proc%2F.git;a=commitdiff_plain;h=f00589a76b75592dfcfdec48a279bdd1122ad0d0;hp=b437b7b6ba61ac9e881180f167162cb34d2095ae

Implement procfs demonstration.
---

diff --git a/hello_procfs.c b/hello_procfs.c
index 1390972..a78eff8 100644
--- a/hello_procfs.c
+++ b/hello_procfs.c
@@ -19,17 +19,65 @@
 
 #include <linux/module.h>
 #include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 
 MODULE_AUTHOR("Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>");
 MODULE_LICENSE("GPL");
 
+static int hello_show(struct seq_file *file, void *data)
+{
+	seq_puts(file, "Hello, world!\n");
+	return 0;
+}
+
+#if 0
+static void * hello_start(struct seq_file *file, loff_t *pos)
+{
+	return NULL;
+}
+
+static void hello_stop(struct seq_file *file, void *data)
+{
+}
+
+static void * hello_next(struct seq_file *file, void *data, loff_t *pos)
+{
+	return NULL;
+}
+
+static const struct seq_operations hello_seqops =
+{
+	.start = hello_start,
+	.stop = hello_stop,
+	.next = hello_next,
+	.show = hello_show,
+};
+#endif
+
+static int hello_procfs_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, hello_show, NULL);
+}
+
+static const struct file_operations hello_procfs_fops =
+{
+	.open = hello_procfs_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = seq_release,
+};
+
 static int hello_procfs_init(void)
 {
+	struct proc_dir_entry *entry;
+	entry = create_proc_entry("gnu", 0666, NULL);
+	entry->proc_fops = &hello_procfs_fops;
 	return 0;
 }
 
 static void hello_procfs_exit(void)
 {
+	remove_proc_entry("gnu", NULL);
 }
 
 module_init(hello_procfs_init);