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respondd-module-airtime: Give more helpful error messages

This commit is contained in:
Jan-Philipp Litza 2017-04-30 11:41:16 +02:00
parent 71823713c0
commit 1a8fd4ba87
1 changed files with 33 additions and 10 deletions
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43
net/respondd-module-airtime/src/netlink.c
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@ -1,3 +1,5 @@
#include <inttypes.h>
#include <linux/nl80211.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/ctrl.h>
@ -6,28 +8,49 @@
bool nl_send_dump(nl_recvmsg_msg_cb_t cb, void *cb_arg, int cmd, uint32_t cmd_arg) {
bool ok = false;
int ret;
int ctrl;
struct nl_sock *sk = NULL;
struct nl_msg *msg = NULL;
#define CHECK(x) { if (!(x)) { fprintf(stderr, "%s: error on line %d\n", __FILE__, __LINE__); goto out; } }
#define ERR(...) { fprintf(stderr, "respondd-module-airtime: " __VA_ARGS__); goto out; }
CHECK(sk = nl_socket_alloc());
CHECK(genl_connect(sk) >= 0);
sk = nl_socket_alloc();
if (!sk)
ERR("nl_socket_alloc() failed\n");
CHECK(ctrl = genl_ctrl_resolve(sk, NL80211_GENL_NAME));
CHECK(nl_socket_modify_cb(sk, NL_CB_VALID, NL_CB_CUSTOM, cb, cb_arg) == 0);
CHECK(msg = nlmsg_alloc());
CHECK(genlmsg_put(msg, 0, 0, ctrl, 0, NLM_F_DUMP, cmd, 0));
ret = genl_connect(sk);
if (ret < 0)
ERR("genl_connect() returned %d\n", ret);
ctrl = genl_ctrl_resolve(sk, NL80211_GENL_NAME);
if (ctrl < 0)
ERR("genl_ctrl_resolve() returned %d\n", ctrl);
ret = nl_socket_modify_cb(sk, NL_CB_VALID, NL_CB_CUSTOM, cb, cb_arg);
if (ret != 0)
ERR("nl_socket_modify_cb() returned %d\n", ret);
msg = nlmsg_alloc();
if (!msg)
ERR("nlmsg_alloc() failed\n");
if (!genlmsg_put(msg, 0, 0, ctrl, 0, NLM_F_DUMP, cmd, 0))
ERR("genlmsg_put() failed while putting cmd %d\n", ret, cmd);
if (cmd_arg != 0)
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, cmd_arg);
CHECK(nl_send_auto_complete(sk, msg) >= 0);
CHECK(nl_recvmsgs_default(sk) >= 0);
ret = nl_send_auto_complete(sk, msg);
if (ret < 0)
ERR("nl_send_auto() returned %d while sending cmd %d with cmd_arg=%"PRIu32"\n", ret, cmd, cmd_arg);
#undef CHECK
ret = nl_recvmsgs_default(sk);
if (ret < 0)
ERR("nl_recv_msgs_default() returned %d while receiving cmd %d with cmd_arg=%"PRIu32"\n", ret, cmd, cmd_arg);
#undef ERR
ok = true;