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

[roopa <roopa@cumulusnetworks.com>]

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@cumulusnetworks.com>
>>
>> replace exit with return -2 on rtnl_talk failure
>>
>> Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.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.