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#define MAX_EVENTS 5 struct epoll_event events[MAX_EVENTS]; while (1) int nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, -1); for (int i = 0; i < nfds; i++) if (events[i].data.fd == fd) char buf[256]; int bytes_read = read(fd, buf, sizeof(buf)); if (bytes_read > 0) // Process your serial data here safely Use code with caution. Direct Comparison: I/O Strategies for Serial Ports CPU Overhead Implementation Complexity Scalability Extremely Low High (blocks thread) Thread-per-Port High (Locks, Mutexes) Continuous Polling 100% CPU Core Event-Driven File Descriptor ( epoll ) Extremely Low Excellent (Scales to 10k+ FDs) Why Integrating Serial FDs into Modern Event Loops Matters serialfd com