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#pragma once
#include <functional>
#include <memory>
#include <phosphor-logging/elog.hpp>
#include <phosphor-logging/elog-errors.hpp>
#include <systemd/sd-event.h>
#include <xyz/openbmc_project/Common/error.hpp>
#include "sdevent/source.hpp"
#include "sdevent/event.hpp"
namespace sdevent
{
namespace event
{
namespace io
{
using namespace phosphor::logging;
/** @class IO
* @brief Provides C++ bindings to the sd_event_source* io functions.
*/
class IO
{
private:
using InternalFailure = sdbusplus::xyz::openbmc_project::Common::
Error::InternalFailure;
public:
/* Define all of the basic class operations:
* Not allowed:
* - Default constructor to avoid nullptrs.
* - Copy operations due to internal unique_ptr.
* Allowed:
* - Move operations.
* - Destructor.
*/
IO() = delete;
IO(const IO&) = delete;
IO& operator=(const IO&) = delete;
IO(IO&&) = default;
IO& operator=(IO&&) = default;
~IO() = default;
using Callback = std::function<void(source::Source&)>;
/** @brief Register an io callback.
*
* @param[in] event - The event to register on.
* @param[in] fd - The file descriptor to poll.
* @param[in] callback - The callback method.
*/
IO(
sdevent::event::Event& event,
int fd,
Callback callback)
: src(nullptr),
cb(std::make_unique<Callback>(std::move(callback)))
{
sd_event_source* source = nullptr;
auto rc = sd_event_add_io(
event.get(),
&source,
fd,
EPOLLIN,
callCallback,
cb.get());
if (rc < 0)
{
log<level::ERR>("Error in call to sd_event_add_io",
entry("RC=%d", rc),
entry("FD=%d", fd));
elog<InternalFailure>();
}
src = decltype(src){source, std::false_type()};
}
/** @brief Set the IO source enable state. */
void enable(int enable)
{
src.enable(enable);
}
/** @brief Query the IO enable state. */
auto enabled()
{
return src.enabled();
}
private:
source::Source src;
std::unique_ptr<Callback> cb = nullptr;
static int callCallback(sd_event_source* s, int fd, uint32_t events,
void* context)
{
source::Source source(s);
auto c = static_cast<Callback*>(context);
(*c)(source);
return 0;
}
};
} // namespace io
} // namespace event
} // namespace sdevent
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