[libcamera-devel] [PATCH v3 12/17] libcamera: media_device: Manage fd by UniqueFD
Hirokazu Honda
hiroh at chromium.org
Mon Nov 29 14:57:43 CET 2021
Hi Laurent,
On Mon, Nov 29, 2021 at 8:58 AM Laurent Pinchart
<laurent.pinchart at ideasonboard.com> wrote:
>
> From: Hirokazu Honda <hiroh at chromium.org>
>
> Manages a file descriptor owned by MediaDevice for a media device
> node by UniqueFD.
>
> Signed-off-by: Hirokazu Honda <hiroh at chromium.org>
> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
Reviewed-by: Hirokazu Honda <hiroh at chromium.org> if applicable.
> ---
> Changes since v2:
>
> - Fix errno handling
> ---
> include/libcamera/internal/media_device.h | 3 +-
> src/libcamera/media_device.cpp | 36 ++++++++++-------------
> 2 files changed, 17 insertions(+), 22 deletions(-)
>
> diff --git a/include/libcamera/internal/media_device.h b/include/libcamera/internal/media_device.h
> index d636e34a8573..af0b25b731eb 100644
> --- a/include/libcamera/internal/media_device.h
> +++ b/include/libcamera/internal/media_device.h
> @@ -16,6 +16,7 @@
>
> #include <libcamera/base/log.h>
> #include <libcamera/base/signal.h>
> +#include <libcamera/base/unique_fd.h>
>
> #include "libcamera/internal/media_object.h"
>
> @@ -82,7 +83,7 @@ private:
> unsigned int version_;
> unsigned int hwRevision_;
>
> - int fd_;
> + UniqueFD fd_;
> bool valid_;
> bool acquired_;
> bool lockOwner_;
> diff --git a/src/libcamera/media_device.cpp b/src/libcamera/media_device.cpp
> index aa93da75c593..4df0a27fe193 100644
> --- a/src/libcamera/media_device.cpp
> +++ b/src/libcamera/media_device.cpp
> @@ -63,15 +63,14 @@ LOG_DEFINE_CATEGORY(MediaDevice)
> * populate() before the media graph can be queried.
> */
> MediaDevice::MediaDevice(const std::string &deviceNode)
> - : deviceNode_(deviceNode), fd_(-1), valid_(false), acquired_(false),
> + : deviceNode_(deviceNode), valid_(false), acquired_(false),
> lockOwner_(false)
> {
> }
>
> MediaDevice::~MediaDevice()
> {
> - if (fd_ != -1)
> - ::close(fd_);
> + fd_.reset();
> clear();
> }
>
> @@ -143,14 +142,14 @@ void MediaDevice::release()
> */
> bool MediaDevice::lock()
> {
> - if (fd_ == -1)
> + if (!fd_.isValid())
> return false;
>
> /* Do not allow nested locking in the same libcamera instance. */
> if (lockOwner_)
> return false;
>
> - if (lockf(fd_, F_TLOCK, 0))
> + if (lockf(fd_.get(), F_TLOCK, 0))
> return false;
>
> lockOwner_ = true;
> @@ -169,7 +168,7 @@ bool MediaDevice::lock()
> */
> void MediaDevice::unlock()
> {
> - if (fd_ == -1)
> + if (!fd_.isValid())
> return;
>
> if (!lockOwner_)
> @@ -177,7 +176,7 @@ void MediaDevice::unlock()
>
> lockOwner_ = false;
>
> - lockf(fd_, F_ULOCK, 0);
> + lockf(fd_.get(), F_ULOCK, 0);
> }
>
> /**
> @@ -220,7 +219,7 @@ int MediaDevice::populate()
> return ret;
>
> struct media_device_info info = {};
> - ret = ioctl(fd_, MEDIA_IOC_DEVICE_INFO, &info);
> + ret = ioctl(fd_.get(), MEDIA_IOC_DEVICE_INFO, &info);
> if (ret) {
> ret = -errno;
> LOG(MediaDevice, Error)
> @@ -243,7 +242,7 @@ int MediaDevice::populate()
> topology.ptr_links = reinterpret_cast<uintptr_t>(links);
> topology.ptr_pads = reinterpret_cast<uintptr_t>(pads);
>
> - ret = ioctl(fd_, MEDIA_IOC_G_TOPOLOGY, &topology);
> + ret = ioctl(fd_.get(), MEDIA_IOC_G_TOPOLOGY, &topology);
> if (ret < 0) {
> ret = -errno;
> LOG(MediaDevice, Error)
> @@ -481,20 +480,19 @@ int MediaDevice::disableLinks()
> */
> int MediaDevice::open()
> {
> - if (fd_ != -1) {
> + if (fd_.isValid()) {
> LOG(MediaDevice, Error) << "MediaDevice already open";
> return -EBUSY;
> }
>
> - int ret = ::open(deviceNode_.c_str(), O_RDWR);
> - if (ret < 0) {
> - ret = -errno;
> + fd_ = UniqueFD(::open(deviceNode_.c_str(), O_RDWR));
> + if (!fd_.isValid()) {
> + int ret = -errno;
> LOG(MediaDevice, Error)
> << "Failed to open media device at "
> << deviceNode_ << ": " << strerror(-ret);
> return ret;
> }
> - fd_ = ret;
>
> return 0;
> }
> @@ -514,11 +512,7 @@ int MediaDevice::open()
> */
> void MediaDevice::close()
> {
> - if (fd_ == -1)
> - return;
> -
> - ::close(fd_);
> - fd_ = -1;
> + fd_.reset();
> }
>
> /**
> @@ -756,7 +750,7 @@ void MediaDevice::fixupEntityFlags(struct media_v2_entity *entity)
> struct media_entity_desc desc = {};
> desc.id = entity->id;
>
> - int ret = ioctl(fd_, MEDIA_IOC_ENUM_ENTITIES, &desc);
> + int ret = ioctl(fd_.get(), MEDIA_IOC_ENUM_ENTITIES, &desc);
> if (ret < 0) {
> ret = -errno;
> LOG(MediaDevice, Debug)
> @@ -799,7 +793,7 @@ int MediaDevice::setupLink(const MediaLink *link, unsigned int flags)
>
> linkDesc.flags = flags;
>
> - int ret = ioctl(fd_, MEDIA_IOC_SETUP_LINK, &linkDesc);
> + int ret = ioctl(fd_.get(), MEDIA_IOC_SETUP_LINK, &linkDesc);
> if (ret) {
> ret = -errno;
> LOG(MediaDevice, Error)
> --
> Regards,
>
> Laurent Pinchart
>
More information about the libcamera-devel
mailing list