netdev - Re: [PATCH iproute2] ip route get: change exit to return to support batch commands

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Message-ID: <20151016060834.GA13468@angus-think.lan>
Date:	Fri, 16 Oct 2015 09:08:34 +0300
From:	Vadim Kochan <vadim4j@...il.com>
To:	roopa <roopa@...ulusnetworks.com>
Cc:	David Ahern <dsa@...ulusnetworks.com>, stephen@...workplumber.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH iproute2] ip route get: change exit to return to support
 batch commands

On Thu, Oct 15, 2015 at 08:13:23PM -0700, roopa wrote:
> On 10/15/15, 7:38 PM, David Ahern wrote:
> > Hi Roopa:
> >
> > On 10/15/15 4:23 PM, Roopa Prabhu wrote:
> >> From: Roopa Prabhu <roopa@...ulusnetworks.com>
> >>
> >> replace exit with return -2 on rtnl_talk failure
> >>
> >> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
> >> ---
> >>   ip/iproute.c | 2 +-
> >>   1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/ip/iproute.c b/ip/iproute.c
> >> index da25548..b137f55 100644
> >> --- a/ip/iproute.c
> >> +++ b/ip/iproute.c
> >> @@ -1643,7 +1643,7 @@ static int iproute_get(int argc, char **argv)
> >>           req.r.rtm_family = AF_INET;
> >>
> >>       if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0)
> >> -        exit(2);
> >> +        return -2;
> >>
> >>       if (connected && !from_ok) {
> >>           struct rtmsg *r = NLMSG_DATA(&req.n);
> >>
> >
> > Why return -2 vs exit(2)? What does the change mean to a user or the functionality of ip?
> Stephen has documented this someplace. I have seen it before. I now forget where. Right now i am just following
> the rest of the code.
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Hi,

IMHO I think it would be good to have #define's for these return values.
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