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cfg: Request and check return value

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Request the return value of the operation from the kernel and check if
it's an error, to inform the user about e.g. not having sufficient
permission.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Bjorn Andersson
2017-06-06 22:15:33 -07:00
parent 0b9959552e
commit b804dcae1b
1 changed files with 15 additions and 1 deletions
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16
src/cfg.c
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@@ -1,4 +1,5 @@
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
@@ -25,6 +26,10 @@ int main(int argc, char **argv)
struct ifaddrmsg ifa;
char attrbuf[32];
} req;
struct {
struct nlmsghdr nh;
struct nlmsgerr err;
} resp;
struct rtattr *rta;
unsigned long addrul;
uint32_t addr;
@@ -46,7 +51,7 @@ int main(int argc, char **argv)
memset(&req, 0, sizeof(req));
req.nh.nlmsg_len = NLMSG_SPACE(sizeof(struct ifaddrmsg));
req.nh.nlmsg_flags = NLM_F_REQUEST;
req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
req.nh.nlmsg_type = RTM_NEWADDR;
req.ifa.ifa_family = AF_QIPCRTR;
@@ -61,5 +66,14 @@ int main(int argc, char **argv)
if (ret < 0)
err(1, "failed to send netlink request");
ret = recv(sock, &resp, sizeof(resp), 0);
if (ret < 0)
err(1, "failed to receive netlink response");
if (resp.nh.nlmsg_type == NLMSG_ERROR && resp.err.error != 0) {
errno = -resp.err.error;
err(1, "failed to configure node id");
}
return 0;
}