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Message-ID: <20150907045044.GY17773@brightrain.aerifal.cx> Date: Mon, 7 Sep 2015 00:50:44 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: process doesn't terminate when closing streams from another thread On Sun, Sep 06, 2015 at 07:00:33PM +0200, Szabolcs Nagy wrote: > * 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. Yes, this is indeed a musl bug. Getting the right fix is non-trivial but I think it will involve having fclose unlock the FILE but ensure that its contents are setup such that the exit-time code behaves as a no-op. Rich
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