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#pragma once
#include <systemd/sd-event.h>
#include <unistd.h>
namespace openpower
{
namespace software
{
namespace updater
{
/* Need a custom deleter for freeing up sd_event_source */
struct EventSourceDeleter
{
void operator()(sd_event_source* eventSource) const
{
eventSource = sd_event_source_unref(eventSource);
}
};
using EventSourcePtr = std::unique_ptr<sd_event_source, EventSourceDeleter>;
/** @struct CustomFd
*
* RAII wrapper for file descriptor.
*/
struct CustomFd
{
public:
CustomFd() = delete;
CustomFd(const CustomFd&) = delete;
CustomFd& operator=(const CustomFd&) = delete;
CustomFd(CustomFd&&) = delete;
CustomFd& operator=(CustomFd&&) = delete;
/** @brief Saves File descriptor and uses it to do file operation
*
* @param[in] fd - File descriptor
*/
CustomFd(int fd) : fd(fd) {}
~CustomFd()
{
if (fd >= 0)
{
close(fd);
}
}
int operator()() const
{
return fd;
}
private:
/** @brief File descriptor */
int fd = -1;
};
/** @class Watch
*
* @brief Adds inotify watch on PNOR symlinks file to monitor for changes in
* "running" PNOR version
*
* The inotify watch is hooked up with sd-event, so that on call back,
* appropriate actions related to a change in the "running" PNOR version
* can be taken.
*/
class Watch
{
public:
/** @brief ctor - hook inotify watch with sd-event
*
* @param[in] loop - sd-event object
* @param[in] functionalCallback - The callback function for updating
* the functional associations.
*/
Watch(sd_event* loop,
std::function<void(std::string&)> functionalCallback);
Watch(const Watch&) = delete;
Watch& operator=(const Watch&) = delete;
Watch(Watch&&) = delete;
Watch& operator=(Watch&&) = delete;
/** @brief dtor - remove inotify watch
*/
~Watch();
private:
/** @brief sd-event callback
*
* @param[in] s - event source, floating (unused) in our case
* @param[in] fd - inotify fd
* @param[in] revents - events that matched for fd
* @param[in] userdata - pointer to Watch object
* @returns 0 on success, -1 on fail
*/
static int callback(sd_event_source* s,
int fd,
uint32_t revents,
void* userdata);
/** initialize an inotify instance and returns file descriptor */
int inotifyInit();
/** @brief PNOR symlink file watch descriptor */
int wd = -1;
/** @brief event source */
EventSourcePtr eventSource;
/** @brief The callback function for updating the
functional associations. */
std::function<void(std::string&)> functionalCallback;
/** @brief inotify file descriptor */
CustomFd fd;
};
} // namespace updater
} // namespace software
} // namespace openpower
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