question on ev_loop_fork

[adream]

It seems that ev_loop_fork didn't work as expected.
Am I misunderstand the document?
So, can any guys shows me an example which would have different
behavior if I call the ev_loop_fork or not?
Thanks
Looking forward for any useful advice.

2016-02-24 21:22 GMT+08:00, adream <adream307 at gmail.com>:
> hi
>     I thought, if I didn't call the ev_loop_fork in the child, then the
> watcher in child wouldn't be triggered.
>     This is my code, I build the ev_loop with EVBACKEND_EPOLL and
> EVFLAG_NOENV flags, so there is no EVFLAG_FORKCHECK flag, then I comment
> the ev_loop_fork call in the child. if everything goes well, I thought the
> child will not trigger the timeout callback function. but actually, the
> output is something like this:
> 4980 fork 4981
> time out at 4980
> time out at 4981
>      it means that the watchers also has been triggered in the child.
>
>
>
>
> #include<ev.h>
> #include<stdio.h>
> #include<unistd.h>
>
> void timeout_cb(EV_P_ ev_timer *w,int revents)
> {
>     printf("time out at %d\n", getpid());
>     ev_break(EV_A_ EVBREAK_ONE);
> }
>
> int main()
> {
>     int ret;
>     ev_timer timeout_watcher;
>
>     struct ev_loop *loop = ev_default_loop(EVBACKEND_EPOLL | EVFLAG_NOENV);
>
>     ev_timer_init(&timeout_watcher,timeout_cb,5.5,0.);
>     ev_timer_start(loop,&timeout_watcher);
>     ret = fork();
>     if(ret>0) printf("%d fork %d\n",getpid(),ret);
>     else if(ret==0)
>     {
>         //ev_loop_fork(EV_DEFAULT);
>     }
>     else return -1;
>     ev_run(loop,0);
>     return 0;
> }
>