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

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Message-ID: <56206314.6020601@cumulusnetworks.com>
Date:	Thu, 15 Oct 2015 20:38:12 -0600
From:	David Ahern <dsa@...ulusnetworks.com>
To:	Roopa Prabhu <roopa@...ulusnetworks.com>,
	stephen@...workplumber.org
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH iproute2] ip route get: change exit to return to support
 batch commands

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?
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