Date: Sun, 14 Sep 1997 03:11:10 -0700 From: Jason Thorpe <thorpej@nas.nasa.gov> To: Simon Shapiro <Shimon@i-connect.net> Cc: freebsd-hackers@freebsd.org Subject: Re: What is wrong with this snipet? Message-ID: <199709141011.DAA01459@lestat.nas.nasa.gov>
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On Sat, 13 Sep 1997 16:34:42 -0700 (PDT)
Simon Shapiro <Shimon@i-Connect.Net> wrote:
> Why would the following segfault on 6 of the 10 iterations?
In the FreeBSD implementation of RFMEM (which does not match Plan 9's),
the child gets the same stack as the parent. If you "return" in the child,
someone's stack gets munched.
>
> int
> main(int argc, char **argv, char **argp)
> {
> int ndx;
>
> for ( ndx = 0; ndx < 10; ndx++ ) {
> switch ( rfork(RFPROC|RFNOWAIT|RFFDG|RFMEM) ) {
> case -1:
> (void)fprintf(stderr, "%s ERROR: Failed to fork (%s)\n",
> argv[0], strerror(errno));
> break;
> case 0:
> return(0);
> }
> }
>
> return(0);
> }
>
> ---
>
>
> Sincerely Yours, (Sent on 13-Sep-97, 16:31:40
> by XF-Mail)
>
> Simon Shapiro Atlas Telecom
> Senior Architect 14355 SW Allen Blvd., Suite 130 Beaverton OR 97005
> Shimon@i-Connect.Net Voice: 503.643.5559, Emergency: 503.799.2313
Jason R. Thorpe thorpej@nas.nasa.gov
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