Add dev_named(dev, name), which is similar in spirit to devtoname().

This function returns success if the device is known by either 'name'
or any of its aliases.

3 files changed, 15 insertions, 0 deletions

diff --git a/sys/kern/kern_conf.c b/sys/kern/kern_conf.c
index 2f3bf92..9935b85 100644
--- a/sys/kern/kern_conf.c
+++ b/sys/kern/kern_conf.c
@@ -300,6 +300,19 @@ make_dev(struct cdevsw *devsw, int minor, uid_t uid, gid_t gid, int perms, const
 	return (dev);
 }
 
+int
+dev_named(dev_t pdev, const char *name)
+{
+	dev_t cdev;
+
+	if (strcmp(devtoname(pdev), name) == 0)
+		return (1);
+	LIST_FOREACH(cdev, &pdev->si_children, si_siblings)
+		if (strcmp(devtoname(cdev), name) == 0)
+			return (1);
+	return (0);
+}
+
 void
 dev_depends(dev_t pdev, dev_t cdev)
 {
diff --git a/sys/sys/conf.h b/sys/sys/conf.h
index f7ce9c7..5c7bf82 100644
--- a/sys/sys/conf.h
+++ b/sys/sys/conf.h
@@ -315,6 +315,7 @@ int	count_dev __P((dev_t dev));
 void	destroy_dev __P((dev_t dev));
 struct cdevsw *devsw __P((dev_t dev));
 const char *devtoname __P((dev_t dev));
+int	dev_named __P((dev_t pdev, const char *name));
 void	dev_depends __P((dev_t pdev, dev_t cdev));
 void	freedev __P((dev_t dev));
 int	iszerodev __P((dev_t dev));
diff --git a/sys/sys/linedisc.h b/sys/sys/linedisc.h
index f7ce9c7..5c7bf82 100644
--- a/sys/sys/linedisc.h
+++ b/sys/sys/linedisc.h
@@ -315,6 +315,7 @@ int	count_dev __P((dev_t dev));
 void	destroy_dev __P((dev_t dev));
 struct cdevsw *devsw __P((dev_t dev));
 const char *devtoname __P((dev_t dev));
+int	dev_named __P((dev_t pdev, const char *name));
 void	dev_depends __P((dev_t pdev, dev_t cdev));
 void	freedev __P((dev_t dev));
 int	iszerodev __P((dev_t dev));