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authorLi Zefan <lizf@cn.fujitsu.com>2008-06-27 20:03:24 -0700
committerDavid S. Miller <davem@davemloft.net>2008-06-27 20:03:24 -0700
commita0a61a604c60c14accc3962ecfeee9acc7a3c08a (patch)
tree45b9922479d2527e641b59fdbb4970ba942f3e0d
parent10b595aff138961b520bfed51d664fd99980f6e9 (diff)
CONNECTOR: add a proc entry to list connectors
I got a problem when I wanted to check if the kernel supports process event connector, and It seems there's no way to do this check. At best I can check if the kernel supports connector or not, by looking into /proc/net/netlink, or maybe checking the return value of bind() to see if it's ENOENT. So it would be useful to add /proc/net/connector to list all supported connectors: # cat /proc/net/connector Name ID connector 4294967295:4294967295 cn_proc 1:1 w1 3:1 Changelog: - fix memory leak: s/seq_release/single_release - use spin_lock_bh instead of spin_lock_irqsave Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/connector/connector.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/connector/connector.c b/drivers/connector/connector.c
index 85e2ba7fcfba..bf4830082a13 100644
--- a/drivers/connector/connector.c
+++ b/drivers/connector/connector.c
@@ -27,6 +27,8 @@
#include <linux/moduleparam.h>
#include <linux/connector.h>
#include <linux/mutex.h>
+#include <linux/proc_fs.h>
+#include <linux/spinlock.h>
#include <net/sock.h>
@@ -403,6 +405,40 @@ static void cn_callback(void *data)
mutex_unlock(&notify_lock);
}
+static int cn_proc_show(struct seq_file *m, void *v)
+{
+ struct cn_queue_dev *dev = cdev.cbdev;
+ struct cn_callback_entry *cbq;
+
+ seq_printf(m, "Name ID\n");
+
+ spin_lock_bh(&dev->queue_lock);
+
+ list_for_each_entry(cbq, &dev->queue_list, callback_entry) {
+ seq_printf(m, "%-15s %u:%u\n",
+ cbq->id.name,
+ cbq->id.id.idx,
+ cbq->id.id.val);
+ }
+
+ spin_unlock_bh(&dev->queue_lock);
+
+ return 0;
+}
+
+static int cn_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, cn_proc_show, NULL);
+}
+
+static const struct file_operations cn_file_ops = {
+ .owner = THIS_MODULE,
+ .open = cn_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release
+};
+
static int __devinit cn_init(void)
{
struct cn_dev *dev = &cdev;
@@ -434,6 +470,8 @@ static int __devinit cn_init(void)
return -EINVAL;
}
+ proc_net_fops_create(&init_net, "connector", S_IRUGO, &cn_file_ops);
+
return 0;
}
@@ -443,6 +481,8 @@ static void __devexit cn_fini(void)
cn_already_initialized = 0;
+ proc_net_remove(&init_net, "connector");
+
cn_del_callback(&dev->id);
cn_queue_free_dev(dev->cbdev);
netlink_kernel_release(dev->nls);

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