As an alternative to cdev_open and using cdev_read/write, we define a
new cdev_fdopen function that returns a file descriptor. The benefit of
this is that code using it may use all the more high level helpers we
have for reading/writing file descriptors.
Signed-off-by: Ahmad Fatoum <ahmad@xxxxxx>
---
fs/devfs-core.c | 20 ++++++++++++++++++++
include/driver.h | 1 +
2 files changed, 21 insertions(+)
diff --git a/fs/devfs-core.c b/fs/devfs-core.c
index 2a259c2fe0ef..fbcf68e81597 100644
--- a/fs/devfs-core.c
+++ b/fs/devfs-core.c
@@ -177,6 +177,26 @@ int cdev_open(struct cdev *cdev, unsigned long flags)
return 0;
}
+int cdev_fdopen(struct cdev *cdev, unsigned long flags)
+{
+ char *path;
+ int fd;
+
+ if (!cdev)
+ return -ENODEV;
+ if (IS_ERR(cdev))
+ return PTR_ERR(cdev);
+
+ path = basprintf("/dev/%s", cdev->name);
+ if (!path)
+ return -ENOMEM;
+
+ fd = open(path, flags);
+
+ free(path);
+ return fd;
+}
+
struct cdev *cdev_open_by_name(const char *name, unsigned long flags)
{
struct cdev *cdev;
diff --git a/include/driver.h b/include/driver.h
index f0a0b9d6ae8f..f53668711b81 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -535,6 +535,7 @@ struct cdev *cdev_open_by_name(const char *name, unsigned long flags);
struct cdev *cdev_create_loop(const char *path, ulong flags, loff_t offset);
void cdev_remove_loop(struct cdev *cdev);
int cdev_open(struct cdev *, unsigned long flags);
+int cdev_fdopen(struct cdev *cdev, unsigned long flags);
void cdev_close(struct cdev *cdev);
int cdev_flush(struct cdev *cdev);
ssize_t cdev_read(struct cdev *cdev, void *buf, size_t count, loff_t offset, ulong flags);
--
2.38.1
