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authorPaul Elder <paul.elder@ideasonboard.com>2020-06-16 12:28:34 +0900
committerPaul Elder <paul.elder@ideasonboard.com>2020-06-25 23:47:13 +0900
commitf155e638168cb0d6cbd9dde8748301fa12a0736f (patch)
tree7ec937104ec1a6dcfc99548f58b153b774cc7181 /src/qcam/assets/feathericons/shield.svg
parent6a5d416b3793401d8bad6e3d398847eeb1158ba0 (diff)
v4l2: v4l2_camera_proxy: Clear internal buffer vector on reqbufs 0
If VIDIOC_REQBUFS with count = 0 is called when the stream is not on, clear the proxy's internal vector of buffer. If the stream is on when reqbufs 0 is called, return -EBUSY. Note that this is contrary to what the V4L2 docs say (reqbufs 0 when streaming should also streamoff), but it is how the V4L2 implementation works. v4l2-compliance doesn't seem to care either way, however, so we cater to the implementation, and no longer call streamoff on reqbufs 0. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'src/qcam/assets/feathericons/shield.svg')
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generated by cgit v1.2.1 (git 2.18.0) at 2024-12-23 07:40:06 +0000
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * v4l2_compat_manager.cpp - V4L2 compatibility manager
 */

#include "v4l2_compat_manager.h"

#include <dlfcn.h>
#include <fcntl.h>
#include <map>
#include <stdarg.h>
#include <string.h>
#include <sys/eventfd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <unistd.h>

#include <libcamera/base/log.h>
#include <libcamera/base/utils.h>

#include <libcamera/camera.h>
#include <libcamera/camera_manager.h>

#include "v4l2_camera_file.h"

using namespace libcamera;

LOG_DEFINE_CATEGORY(V4L2Compat)

namespace {
template<typename T>
void get_symbol(T &func, const char *name)
{
	func = reinterpret_cast<T>(dlsym(RTLD_NEXT, name));
}
} /* namespace */

V4L2CompatManager::V4L2CompatManager()
	: cm_(nullptr)
{
	get_symbol(fops_.openat, "openat64");
	get_symbol(fops_.dup, "dup");
	get_symbol(fops_.close, "close");
	get_symbol(fops_.ioctl, "ioctl");
	get_symbol(fops_.mmap, "mmap64");
	get_symbol(fops_.munmap, "munmap");
}

V4L2CompatManager::~V4L2CompatManager()
{
	files_.clear();