From c9cbceab01d4afa983dbfa7ee12c5d5e438b78f5 Mon Sep 17 00:00:00 2001 From: Manuel Traut Date: Wed, 29 Sep 2010 09:14:58 +0200 Subject: kernel-devel/chardev: added example kernel and userspace example, for open, close, read, write TODO: implement read, write Signed-off-by: Manuel Traut --- kernel-devel/char-device/example/kernel/huhu.c | 64 ++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 kernel-devel/char-device/example/kernel/huhu.c (limited to 'kernel-devel/char-device/example/kernel/huhu.c') diff --git a/kernel-devel/char-device/example/kernel/huhu.c b/kernel-devel/char-device/example/kernel/huhu.c new file mode 100644 index 0000000..99eafe7 --- /dev/null +++ b/kernel-devel/char-device/example/kernel/huhu.c @@ -0,0 +1,64 @@ +#include +#include +#include + +static int major; + +static int huhu_open(struct inode *node, struct file *f) +{ + printk(KERN_INFO "huhu_open: done\n"); + return 0; +} + +static int huhu_release(struct inode *node, struct file *f) +{ + printk(KERN_INFO "huhu_release: done\n"); + return 0; +} + +static ssize_t huhu_read(struct file *f, char __user *u, size_t s, loff_t *l) +{ + printk(KERN_INFO "huhu_read\n"); + return 0; +} + +static ssize_t huhu_write (struct file *f, const char __user *u, size_t s, + loff_t *l) +{ + printk(KERN_INFO "huhu_write\n"); + return 0; +} + +static const struct file_operations huhu_fops = { + .owner = THIS_MODULE, + .open = huhu_open, + .release = huhu_release, + .read = huhu_read, + .write = huhu_write, +}; + +static int huhu_init(void) +{ + major = register_chrdev (0, "huhu", &huhu_fops); + if (major < 0) + { + printk(KERN_ERR "huhu_init: register_chrdev failed\n"); + return major; + } + printk(KERN_INFO "mknod /dev/huhu c %d 0", major); + return 0; +} + +static void huhu_exit(void) +{ + unregister_chrdev (major, "huhu"); + printk(KERN_INFO "huhu_exit: done\n"); +} + +module_init(huhu_init); +module_exit(huhu_exit); + +MODULE_AUTHOR("Manuel Traut "); +MODULE_DESCRIPTION("a more or less useless module using char"); +MODULE_LICENSE("GPL v2"); +MODULE_VERSION("0815"); -- cgit v1.2.3