Alex Vakulenko | e4eec20 | 2017-01-27 14:41:04 -0800 | [diff] [blame^] | 1 | #ifndef LIBS_VR_LIBDVRCOMMON_INCLUDE_PRIVATE_DVR_EPOLL_FILE_DESCRIPTOR_H_ |
| 2 | #define LIBS_VR_LIBDVRCOMMON_INCLUDE_PRIVATE_DVR_EPOLL_FILE_DESCRIPTOR_H_ |
| 3 | |
| 4 | #include <android-base/unique_fd.h> |
| 5 | #include <base/logging.h> |
| 6 | #include <sys/epoll.h> |
| 7 | |
| 8 | namespace android { |
| 9 | namespace dvr { |
| 10 | |
| 11 | class EpollFileDescriptor { |
| 12 | public: |
| 13 | static const int CTL_ADD = EPOLL_CTL_ADD; |
| 14 | static const int CTL_MOD = EPOLL_CTL_MOD; |
| 15 | static const int CTL_DEL = EPOLL_CTL_DEL; |
| 16 | |
| 17 | EpollFileDescriptor() : fd_(-1) {} |
| 18 | |
| 19 | // Constructs an EpollFileDescriptor from an integer file descriptor and |
| 20 | // takes ownership. |
| 21 | explicit EpollFileDescriptor(int fd) : fd_(fd) {} |
| 22 | |
| 23 | bool IsValid() const { return fd_.get() >= 0; } |
| 24 | |
| 25 | int Create() { |
| 26 | if (IsValid()) { |
| 27 | LOG(WARNING) << "epoll fd has already been created."; |
| 28 | return -EALREADY; |
| 29 | } |
| 30 | |
| 31 | fd_.reset(epoll_create(64)); |
| 32 | |
| 33 | if (fd_.get() < 0) |
| 34 | return -errno; |
| 35 | else |
| 36 | return 0; |
| 37 | } |
| 38 | |
| 39 | int Control(int op, int target_fd, epoll_event* ev) { |
| 40 | if (epoll_ctl(fd_.get(), op, target_fd, ev) < 0) |
| 41 | return -errno; |
| 42 | else |
| 43 | return 0; |
| 44 | } |
| 45 | |
| 46 | int Wait(epoll_event* events, int maxevents, int timeout) { |
| 47 | int ret = epoll_wait(fd_.get(), events, maxevents, timeout); |
| 48 | |
| 49 | if (ret < 0) |
| 50 | return -errno; |
| 51 | else |
| 52 | return ret; |
| 53 | } |
| 54 | |
| 55 | private: |
| 56 | base::unique_fd fd_; |
| 57 | }; |
| 58 | |
| 59 | } // namespace dvr |
| 60 | } // namespace android |
| 61 | |
| 62 | #endif // LIBS_VR_LIBDVRCOMMON_INCLUDE_PRIVATE_DVR_EPOLL_FILE_DESCRIPTOR_H_ |