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#pragma once
#include <memory>
#include <systemd/sd-event.h>
// TODO: openbmc/openbmc#1720 - add error handling for sd_event API failures
namespace sdevent
{
namespace source
{
using SourcePtr = sd_event_source*;
namespace details
{
/** @brief unique_ptr functor to release a source reference. */
struct SourceDeleter
{
void operator()(sd_event_source* ptr) const
{
deleter(ptr);
}
decltype(&sd_event_source_unref) deleter = sd_event_source_unref;
};
/* @brief Alias 'source' to a unique_ptr type for auto-release. */
using source = std::unique_ptr<sd_event_source, SourceDeleter>;
} // namespace details
/** @class Source
* @brief Provides C++ bindings to the sd_event_source* functions.
*/
class Source
{
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.
*/
Source() = delete;
Source(const Source&) = delete;
Source& operator=(const Source&) = delete;
Source(Source&&) = default;
Source& operator=(Source&&) = default;
~Source() = default;
/** @brief Conversion constructor from 'SourcePtr'.
*
* Increments ref-count of the source-pointer and releases it
* when done.
*/
explicit Source(SourcePtr s) : src(sd_event_source_ref(s)) {}
/** @brief Constructor for 'source'.
*
* Takes ownership of the source-pointer and releases it when done.
*/
Source(SourcePtr s, std::false_type) : src(s) {}
/** @brief Check if source contains a real pointer. (non-nullptr). */
explicit operator bool() const
{
return bool(src);
}
/** @brief Test whether or not the source can generate events. */
auto enabled()
{
int enabled;
sd_event_source_get_enabled(src.get(), &enabled);
return enabled;
}
/** @brief Allow the source to generate events. */
void enable(int enable)
{
sd_event_source_set_enabled(src.get(), enable);
}
private:
details::source src;
};
} // namespace source
} // namespace sdevent
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