libcamera/pinchartl/libcamera.git - Laurent Pinchart's clone of libcamera

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Diffstat (limited to 'src/ipa/raspberrypi/controller/rpi/ccm.hpp')

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/* SPDX-License-Identifier: LGPL-2.1-or-later */ /* * Copyright (C) 2021, Google Inc. * * unique_fd.cpp - File descriptor wrapper that owns a file descriptor */ #include <libcamera/base/unique_fd.h> #include <unistd.h> #include <utility> #include <libcamera/base/log.h> /** * \file base/unique_fd.h * \brief File descriptor wrapper that owns a file descriptor */ namespace libcamera { LOG_DEFINE_CATEGORY(UniqueFD) /** * \class UniqueFD * \brief unique_ptr-like wrapper for a file descriptor * * The UniqueFD is a wrapper that owns and manages the lifetime of a file * descriptor. It is constructed from a numerical file descriptor, and takes * over its ownership. The file descriptor is closed when the UniqueFD is * destroyed, or when it is assigned another file descriptor with operator=() * or reset(). */ /** * \fn UniqueFD::UniqueFD() * \brief Construct a UniqueFD that owns no file descriptor */ /** * \fn UniqueFD::UniqueFD(int fd) * \brief Construct a UniqueFD that owns \a fd * \param[in] fd A file descriptor to manage */ /** * \fn UniqueFD::UniqueFD(UniqueFD &&other) * \brief Move constructor, create a UniqueFD by taking over \a other * \param[in] other The other UniqueFD * * Create a UniqueFD by transferring ownership of the file descriptor owned by * \a other. Upon return, the \a other UniqueFD is invalid. */ /** * \fn UniqueFD::~UniqueFD() * \brief Destroy the UniqueFD instance * * If a file descriptor is owned, it is closed. */ /** * \fn UniqueFD::operator=(UniqueFD &&other) * \brief Move assignment operator, replace a UniqueFD by taking over \a other * \param[in] other The other UniqueFD * * If this UniqueFD owns a file descriptor, the file descriptor is closed * first. The file descriptor is then replaced by the one of \a other. Upon * return, \a other is invalid. * * \return A reference to this UniqueFD */ /** * \fn UniqueFD::release() * \brief Release ownership of the file descriptor without closing it * * This function releases and returns the owned file descriptor without closing * it. The caller owns the returned value and must take care of handling its * life time to avoid file descriptor leakages. Upon return this UniqueFD is * invalid. * * \return The managed file descriptor, or -1 if no file descriptor was owned */ /** * \brief Replace the managed file descriptor * \param[in] fd The new file descriptor to manage * * Close the managed file descriptor, if any, and replace it with the new \a fd. * * Self-resetting (passing an \a fd already managed by this instance) is invalid * and results in undefined behaviour. */ void UniqueFD::reset(int fd) { ASSERT(!isValid() || fd != fd_); std::swap(fd, fd_); if (fd >= 0) close(fd); } /** * \fn UniqueFD::swap(UniqueFD &other) * \brief Swap the managed file descriptors with another UniqueFD * \param[in] other Another UniqueFD to swap the file descriptor with */ /** * \fn UniqueFD::get() * \brief Retrieve the managed file descriptor * \return The managed file descriptor, or -1 if no file descriptor is owned */ /** * \fn UniqueFD::isValid() * \brief Check if the UniqueFD owns a valid file descriptor * \return True if the UniqueFD owns a valid file descriptor, false otherwise */ } /* namespace libcamera */


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