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From: Szabolcs Nagy <nsz@port70.net>
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Subject: Re: process doesn't terminate when closing streams from
 another thread
Date: Sun, 6 Sep 2015 19:00:33 +0200
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* Nuno Gon?alves <nunojpg@gmail.com> [2015-09-06 15:44:45 +0100]:
> I'm having problems when closing streams from another thread.
> 
> The following code:
> 
> static void *func(void *arg)
> {
>    fclose(stdout);
>    fprintf(stderr,"Thread about to exit\n");
>    return 0;
> }
> 
> int main(int argc, char **argv)
> {
>    int thread_id;

s/int/pthread_t/

>    pthread_create(&thread_id,NULL,&func,NULL);
>    pthread_join(thread_id,NULL);
>    fprintf(stderr,"Process about to terminate\n");
>    return 0;
> }
> 
> Prints:
> 
> root@OpenWrt:/tmp# ./myapp_withmusl
> Thread about to exit
> Process about to terminate
> 
> But never returns! I have to send it a SIGINT.
> 

yes, musl fflushes stdout on fflush(0) even if
it is closed. (fflush(0) is called at exit,
fflushing a closed stream is undefined behaviour).

this might be a musl bug.