Date: Fri, 6 Jul 2001 17:40:19 +0300 From: Peter Pentchev <roam@orbitel.bg> To: Evan Sarmiento <kaworu@sektor7.ath.cx> Cc: freebsd-hackers@freebsd.org Subject: Re: LIST_NEXT() Message-ID: <20010706174019.B700@ringworld.oblivion.bg> In-Reply-To: <200107061348.JAA26189@mail1.javanet.com>; from kaworu@sektor7.ath.cx on Fri, Jul 06, 2001 at 09:48:26AM -0400 References: <200107061348.JAA26189@mail1.javanet.com>
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On Fri, Jul 06, 2001 at 09:48:26AM -0400, Evan Sarmiento wrote: > Hello, > > I'm writing a kernel module, and it involves traversing the proc list searching for the right structure, > however, when I use SLIST_NEXT(p, p_list) in the program, I get a warning when I compile it: > > warning: statement with mo effect > > What am I doing wrong? I've read the manpages on queue and looked at the proc structure. > > Here's the code: > int > prfw_setflags(p, uap) > struct proc *p; > struct prfw_setflags_args *uap; > { > ... > if (uap->id) { > while (uap->id != p->p_pid) > LIST_NEXT(p, p_list); > } Well, first, you're using LIST_NEXT(), not SLIST_NEXT() :) Second, none of the *_NEXT() queue.h macros modify their parameters; they just return a pointer to the next element. So, just try: p = LIST_NEXT(p, p_list); ..and you'll be just fine. G'luck, Peter -- If I were you, who would be reading this sentence? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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