https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240590
Bug ID: 240590
Summary: Linuxulator: EPOLLONESHOT is broken
Product: Base System
Version: 12.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: iwt...@gmail.com
Here's a reproducer:
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/epoll.h>
int main() {
int epfd = epoll_create(8);
assert(epfd);
struct epoll_event event = {
.events = EPOLLOUT | EPOLLONESHOT,
.data = 0
};
int err1 = epoll_ctl(epfd, EPOLL_CTL_ADD, STDIN_FILENO, &event);
assert(err1 == 0);
struct epoll_event events[1];
int n = epoll_wait(epfd, events, 1, -1);
assert(n > 0);
int err2 = epoll_ctl(epfd, EPOLL_CTL_MOD, STDIN_FILENO, &event);
if (err2 == 0) {
printf("ok\n");
} else {
perror("EPOLL_CTL_MOD failed");
}
return 0;
}
This program runs fine on Linux, while on FreeBSD it prints "EPOLL_CTL_MOD
failed: No such file or directory". The man page on kevent says about
EV_ONESHOT "After the user retrieves the event from the kqueue, it is deleted",
so presumably that's why.
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