1 #ifndef ANDROID_DVR_EPOLL_FILE_DESCRIPTOR_H_ 2 #define ANDROID_DVR_EPOLL_FILE_DESCRIPTOR_H_ 3 4 #include <android-base/unique_fd.h> 5 #include <log/log.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 ALOGW("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 int Get() const { return fd_.get(); } 56 57 private: 58 base::unique_fd fd_; 59 }; 60 61 } // namespace dvr 62 } // namespace android 63 64 #endif // ANDROID_DVR_EPOLL_FILE_DESCRIPTOR_H_ 65
