iplink: use the short format to print help info

Allow to print link type usage by: ip link help bridge

Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com>

diff --git a/ip/iplink_bridge.c b/ip/iplink_bridge.c
index 297160c490fdb1e463b1cb472605d6b175ec3640..1e699601ffc2c557e1b1224653a16f2f6b1f7a25 100644 (file)
--- a/ip/iplink_bridge.c
+++ b/ip/iplink_bridge.c
@@ -17,9 +17,9 @@
 #include "utils.h"
 #include "ip_common.h"
 
-static void explain(void)
+static void print_explain(FILE *f)
 {
-       fprintf(stderr,
+       fprintf(f,
                "Usage: ... bridge [ forward_delay FORWARD_DELAY ]\n"
                "                  [ hello_time HELLO_TIME ]\n"
                "                  [ max_age MAX_AGE ]\n"
@@ -29,6 +29,11 @@ static void explain(void)
        );
 }
 
+static void explain(void)
+{
+       print_explain(stderr);
+}
+
 static int bridge_parse_opt(struct link_util *lu, int argc, char **argv,
                            struct nlmsghdr *n)
 {
@@ -111,9 +116,16 @@ static void bridge_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
                        rta_getattr_u32(tb[IFLA_BR_MAX_AGE]));
 }
 
+static void bridge_print_help(struct link_util *lu, int argc, char **argv,
+               FILE *f)
+{
+       print_explain(f);
+}
+
 struct link_util bridge_link_util = {
        .id             = "bridge",
        .maxattr        = IFLA_BR_MAX,
        .parse_opt      = bridge_parse_opt,
        .print_opt      = bridge_print_opt,
+       .print_help     = bridge_print_help,
 };