libcamera: v4l2_device: Use UniqueFD for a file descriptor

Manages a file descriptor owned by V4L2Device for a v4l2 device node
by UniqueFD.

Signed-off-by: Hirokazu Honda <hiroh@chromium.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/include/libcamera/internal/v4l2_device.h b/include/libcamera/internal/v4l2_device.h
index 7816a290..8886b750 100644
--- a/include/libcamera/internal/v4l2_device.h
+++ b/include/libcamera/internal/v4l2_device.h
@@ -16,6 +16,7 @@
 #include <libcamera/base/log.h>
 #include <libcamera/base/signal.h>
 #include <libcamera/base/span.h>
+#include <libcamera/base/unique_fd.h>
 
 #include <libcamera/controls.h>
 
@@ -27,7 +28,7 @@ class V4L2Device : protected Loggable
 {
 public:
 	void close();
-	bool isOpen() const { return fd_ != -1; }
+	bool isOpen() const { return fd_.isValid(); }
 
 	const ControlInfoMap &controls() const { return controls_; }
 
@@ -49,11 +50,11 @@ protected:
 	~V4L2Device();
 
 	int open(unsigned int flags);
-	int setFd(int fd);
+	int setFd(UniqueFD fd);
 
 	int ioctl(unsigned long request, void *argp);
 
-	int fd() const { return fd_; }
+	int fd() const { return fd_.get(); }
 
 private:
 	static ControlType v4l2CtrlType(uint32_t ctrlType);
@@ -72,7 +73,7 @@ private:
 	ControlIdMap controlIdMap_;
 	ControlInfoMap controls_;
 	std::string deviceNode_;
-	int fd_;
+	UniqueFD fd_;
 
 	EventNotifier *fdEventNotifier_;
 	bool frameStartEnabled_;