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feat(lab03): change epoll event flags

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This commit is contained in:
fastium
2026-04-24 14:37:22 +02:00
parent c94273f8bf
commit 734e269533
1 changed files with 6 additions and 5 deletions
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11
src/03-led-controller/main.c
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@@ -54,12 +54,13 @@ int main(void)
return 1;
}
// 2. Add button to epoll
// Add buttons to epoll
struct epoll_event ev[NBR_BTN];
// CRITICAL: Sysfs GPIOs use EPOLLPRI (priority data) and EPOLLERR, not EPOLLIN!
// EPOLLIN is working well as EPOLLPRI (which is more used for priority data)
// EPOLLERR is used to detect if there is an error
// EPOLLET is for edge triggered mode (non-blocking)
for(int i=0; i<NBR_BTN; i++) {
ev[i].events = EPOLLPRI | EPOLLERR | EPOLLET;
ev[i].events = EPOLLIN | EPOLLERR | EPOLLET;
ev[i].data.fd = btn[i];
if (epoll_ctl(epfd, EPOLL_CTL_ADD, btn[i], &ev[i]) < 0) {
perror("Failed to add button to epoll");
@@ -77,7 +78,7 @@ int main(void)
// Event main loop
while (1) {
struct epoll_event events[NBR_BTN]; // We only care about 1 event for now
struct epoll_event events[NBR_BTN];
// Timeout is -1: Block infinitely until an event occurs!
int n = epoll_wait(epfd, events, 1, -1);