iplink: bond_slave: Add missing help functions

Signed-off-by: Phil Sutter <phil@nwl.cc>

diff --git a/ip/iplink_bond_slave.c b/ip/iplink_bond_slave.c
index d67793237edfc264d0f36e1dc63dd3d26bb16c73..9c60dea8a27574bc3c892567cf06d9091e0b5d17 100644 (file)
--- a/ip/iplink_bond_slave.c
+++ b/ip/iplink_bond_slave.c
@@ -17,6 +17,16 @@
 #include "utils.h"
 #include "ip_common.h"
 
+static void print_explain(FILE *f)
+{
+       fprintf(f, "Usage: ... bond_slave [ queue_id ID ]\n");
+}
+
+static void explain(void)
+{
+       print_explain(stderr);
+}
+
 static const char *slave_states[] = {
        [BOND_STATE_ACTIVE] = "ACTIVE",
        [BOND_STATE_BACKUP] = "BACKUP",
@@ -99,6 +109,13 @@ static int bond_slave_parse_opt(struct link_util *lu, int argc, char **argv,
                        if (get_u16(&queue_id, *argv, 0))
                                invarg("queue_id is invalid", *argv);
                        addattr16(n, 1024, IFLA_BOND_SLAVE_QUEUE_ID, queue_id);
+               } else {
+                       if (matches(*argv, "help") != 0)
+                               fprintf(stderr,
+                                       "bond_slave: unknown option \"%s\"?\n",
+                                       *argv);
+                       explain();
+                       return -1;
                }
                argc--, argv++;
        }
@@ -106,10 +123,17 @@ static int bond_slave_parse_opt(struct link_util *lu, int argc, char **argv,
        return 0;
 }
 
+static void bond_slave_print_help(struct link_util *lu, int argc, char **argv,
+                                 FILE *f)
+{
+       print_explain(f);
+}
+
 struct link_util bond_slave_link_util = {
        .id             = "bond",
        .maxattr        = IFLA_BOND_SLAVE_MAX,
        .print_opt      = bond_slave_print_opt,
        .parse_opt      = bond_slave_parse_opt,
+       .print_help     = bond_slave_print_help,
        .slave          = true,
 };