2.6.0 didn't have "subsystem" links; use "ifindex" instead.
diff --git a/pcap-linux.c b/pcap-linux.c
index 7f48a4f..a42c3ac 100644
--- a/pcap-linux.c
+++ b/pcap-linux.c
@@ -1919,22 +1919,32 @@
continue;
/*
- * Ignore plain files.
+ * Ignore plain files; they do not have subdirectories
+ * and thus have no attributes.
*/
if (ent->d_type == DT_REG)
continue;
/*
- * Is there a "subsystem" file under that name?
+ * Is there an "ifindex" file under that name?
* (We don't care whether it's a directory or
* a symlink; older kernels have directories
* for devices, newer kernels have symlinks to
* directories.)
*/
snprintf(subsystem_path, sizeof subsystem_path,
- "/sys/class/net/%s/subsystem", ent->d_name);
+ "/sys/class/net/%s/ifindex", ent->d_name);
if (lstat(subsystem_path, &statb) != 0) {
- /* Stat failed, ignore */
+ /*
+ * Stat failed. Either there was an error
+ * other than ENOENT, and we don't know if
+ * this is an interface, or it's ENOENT,
+ * and either some part of "/sys/class/net/{if}"
+ * disappeared, in which case it probably means
+ * the interface disappeared, or there's no
+ * "ifindex" file, which means it's not a
+ * network interface.
+ */
continue;
}
