Add time.h include

[project/netifd.git] / system-linux.c

diff --git a/system-linux.c b/system-linux.c
index 1598170..4a3de8c 100644 (file)
--- a/system-linux.c
+++ b/system-linux.c
@@ -14,6 +14,7 @@
 #include <string.h>
 #include <fcntl.h>
 #include <glob.h>
+#include <time.h>
 
 #include <netlink/msg.h>
 #include <netlink/attr.h>
@@ -603,10 +604,41 @@ int system_if_down(struct device *dev)
 
 int system_if_check(struct device *dev)
 {
-       device_set_present(dev, (system_if_resolve(dev) >= 0));
+       device_set_present(dev, (system_if_resolve(dev) > 0));
        return 0;
 }
 
+struct device *
+system_if_get_parent(struct device *dev)
+{
+       char buf[64], *devname;
+       int ifindex, iflink, len;
+       FILE *f;
+
+       snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
+       f = fopen(buf, "r");
+       if (!f)
+               return NULL;
+
+       len = fread(buf, 1, sizeof(buf) - 1, f);
+       fclose(f);
+
+       if (len <= 0)
+               return NULL;
+
+       buf[len] = 0;
+       iflink = strtoul(buf, NULL, 0);
+       ifindex = system_if_resolve(dev);
+       if (!iflink || iflink == ifindex)
+               return NULL;
+
+       devname = if_indextoname(iflink, buf);
+       if (!devname)
+               return NULL;
+
+       return device_get(devname, true);
+}
+
 int system_if_dump_stats(struct device *dev, struct blob_buf *b)
 {
        const char *const counters[] = {