[libcamera-devel] [RFC PATCH 10/10] v4l2: V4L2Camera: Return int in getBufferFd()

[Hirokazu Honda]

V4L2Camera::getBufferFd() returns FileDescriptor. However, the
file descriptor is still owned by V4L2Camera. It should rather
return an integer to represent V4L2Camera doesn't have the
ownership of the file descriptor.

Signed-off-by: Hirokazu Honda <hiroh at chromium.org>
---
 src/v4l2/v4l2_camera.cpp       | 6 +++---
 src/v4l2/v4l2_camera.h         | 2 +-
 src/v4l2/v4l2_camera_proxy.cpp | 6 +++---
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/v4l2/v4l2_camera.cpp b/src/v4l2/v4l2_camera.cpp
index 97825c71..cccc6749 100644
--- a/src/v4l2/v4l2_camera.cpp
+++ b/src/v4l2/v4l2_camera.cpp
@@ -186,16 +186,16 @@ void V4L2Camera::freeBuffers()
 	bufferAllocator_->free(stream);
 }
 
-FileDescriptor V4L2Camera::getBufferFd(unsigned int index)
+int V4L2Camera::getBufferFd(unsigned int index)
 {
 	Stream *stream = config_->at(0).stream();
 	const std::vector<std::unique_ptr<FrameBuffer>> &buffers =
 		bufferAllocator_->buffers(stream);
 
 	if (buffers.size() <= index)
-		return FileDescriptor();
+		return -1;
 
-	return buffers[index]->planes()[0].fd;
+	return buffers[index]->planes()[0].fd.fd();
 }
 
 int V4L2Camera::streamOn()
diff --git a/src/v4l2/v4l2_camera.h b/src/v4l2/v4l2_camera.h
index d2380462..8efe1642 100644
--- a/src/v4l2/v4l2_camera.h
+++ b/src/v4l2/v4l2_camera.h
@@ -53,7 +53,7 @@ public:
 
 	int allocBuffers(unsigned int count);
 	void freeBuffers();
-	FileDescriptor getBufferFd(unsigned int index);
+	int getBufferFd(unsigned int index);
 
 	int streamOn();
 	int streamOff();
diff --git a/src/v4l2/v4l2_camera_proxy.cpp b/src/v4l2/v4l2_camera_proxy.cpp
index f8bfe595..8f417421 100644
--- a/src/v4l2/v4l2_camera_proxy.cpp
+++ b/src/v4l2/v4l2_camera_proxy.cpp
@@ -112,14 +112,14 @@ void *V4L2CameraProxy::mmap(void *addr, size_t length, int prot, int flags,
 		return MAP_FAILED;
 	}
 
-	FileDescriptor fd = vcam_->getBufferFd(index);
-	if (!fd.isValid()) {
+	int fd = vcam_->getBufferFd(index);
+	if (fd < 0) {
 		errno = EINVAL;
 		return MAP_FAILED;
 	}
 
 	void *map = V4L2CompatManager::instance()->fops().mmap(addr, length, prot,
-							       flags, fd.fd(), 0);
+							       flags, fd, 0);
 	if (map == MAP_FAILED)
 		return map;
 
-- 
2.31.1.368.gbe11c130af-goog