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Date: Sun, 6 Sep 2015 19:00:33 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: process doesn't terminate when closing streams from
another thread
* Nuno Gon?alves <nunojpg@...il.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@...nWrt:/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.
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