Hello everyone, I'm creating my coursework project and I should create my own C++ library for easier GPIO usage. I'm struggling with using epoll in my code, because it doesn't register edge events, that I specified. My code looks like this:
void somePollingFunc(std::string path) {
int epollFD = epoll_create1(0);
if(epollFD == -1){
throw std::runtime_error("Failed to create epoll");
}
int socketToRead = open(path.c_str(), O_RDONLY | O_NONBLOCK);
if(socketToRead < 0) {
throw std::runtime_error(std::string("Failed to open file\nPath: ") + path.data());
}
// Creating epoll struct
struct epoll_event gpioPollFD;
gpioPollFD.data.fd = socketToRead;
gpioPollFD.events = EPOLLET;
// Adding gpio fd to epoll
if(epoll_ctl(epollFD, EPOLL_CTL_ADD, socketToRead, &gpioPollFD) == -1) {
throw std::runtime_error("Failed to add custom file descriptor to epoll");
}
char readByte;
bool callbackStop = false;
int pollValue;
do {
pollValue = epoll_wait(epollFD, &gpioPollFD, 1, 100);
if(pollValue == 0){ continue; }
if(::read(gpioPollFD.data.fd, &readByte, 1)){
callbackStop = callback(readByte);
}
lseek(gpioPollFD.data.fd, 0, SEEK_SET);
} while(!callbackStop);
close(epollFD);
}
I checked my edge file, its value is set right, also I experimented using EPOLLIN or EPOLLPRI, they both works for every action that happen to socket
Am I missing something or such functionality doesn't work?
