dhcpcd: Add an option to poll the interface carrier state

Only to be used if the interface does not report carrier state
changes for whatever reason.

1 files changed, 26 insertions, 0 deletions

diff --git a/src/if.c b/src/if.c
index 9e158a9c..04a48c3b 100644
--- a/src/if.c
+++ b/src/if.c
@@ -64,7 +64,9 @@
 #include <syslog.h>
 #include <unistd.h>
 
+#define ELOOP_QUEUE	ELOOP_IF
 #include "common.h"
+#include "eloop.h"
 #include "dev.h"
 #include "dhcp.h"
 #include "dhcp6.h"
@@ -661,6 +663,30 @@ if_discover(struct dhcpcd_ctx *ctx, struct ifaddrs **ifaddrs,
 	return ifs;
 }
 
+static void
+if_poll(void *arg)
+{
+	struct interface *ifp = arg;
+	unsigned int flags = ifp->flags;
+	int carrier;
+
+	carrier = if_carrier(ifp); /* if_carrier will update ifp->flags */
+	if (ifp->carrier != carrier || ifp->flags != flags)
+		dhcpcd_handlecarrier(ifp->ctx, carrier, ifp->flags, ifp->name);
+
+	if (ifp->options->poll != 0 || ifp->carrier != LINK_UP)
+		if_pollinit(ifp);
+}
+
+int
+if_pollinit(struct interface *ifp)
+{
+	unsigned long msec;
+
+	msec = ifp->options->poll != 0 ? ifp->options->poll : IF_POLL_UP;
+	return eloop_timeout_add_msec(ifp->ctx->eloop, msec, if_poll, ifp);
+}
+
 /*
  * eth0.100:2 OR eth0i100:2 (seems to be NetBSD xvif(4) only)
  *