From 5a70420b7652b7eb5a07d8190a4e6faab461c7e7 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@osmocom.org>
Date: Wed, 6 Nov 2019 16:44:04 +0100
Subject: [PATCH] e1_recorder: Skip storing data to disk if line is in ALARM
 state

Change-Id: Ie4c671053d372bc700f506198d1916853da03b9e
---
 src/e1_recorder.c | 30 ++++++++++++++++++++++++++++++
 src/recorder.h    |  1 +
 2 files changed, 31 insertions(+)

diff --git a/src/e1_recorder.c b/src/e1_recorder.c
index 9110ccb..4887c3d 100644
--- a/src/e1_recorder.c
+++ b/src/e1_recorder.c
@@ -28,6 +28,29 @@ static enum osmo_e1cap_capture_mode ts2cap_mode(struct e1inp_ts *ts)
 	}
 }
 
+static int sig_inp_cbfn(unsigned int subsys, unsigned int signal, void *handler_data, void *signal_data)
+{
+	struct input_signal_data *isd = signal_data;
+	struct e1_recorder_line *rline;
+
+	OSMO_ASSERT(subsys == SS_L_INPUT);
+	OSMO_ASSERT(isd->line && isd->line->num < ARRAY_SIZE(g_recorder.line));
+
+	switch (signal) {
+	case S_L_INP_LINE_ALARM:
+		LOGP(DMAIN, LOGL_NOTICE, "Line %u: ALARM\n", isd->line->num);
+		rline = &g_recorder.line[isd->line->num];
+		rline->has_alarm = true;
+		break;
+	case S_L_INP_LINE_NOALARM:
+		LOGP(DMAIN, LOGL_NOTICE, "Line %u: NOALARM\n", isd->line->num);
+		rline = &g_recorder.line[isd->line->num];
+		rline->has_alarm = false;
+		break;
+	}
+	return 0;
+}
+
 /* receive a raw message frome the E1 timeslot */
 void e1ts_raw_recv(struct e1inp_ts *ts, struct msgb *msg)
 {
@@ -35,6 +58,11 @@ void e1ts_raw_recv(struct e1inp_ts *ts, struct msgb *msg)
 	enum osmo_e1cap_capture_mode cap_mode = ts2cap_mode(ts);
 	int rc;
 
+	if (rline->has_alarm) {
+		DEBUGP(DMAIN, "Skipping storage as line %u is in ALARM\n", ts->line->num);
+		return;
+	}
+
 	/* FIXME: special processing of TFP and PGSL */
 
 	rc = e1frame_store(ts, msg, cap_mode);
@@ -144,6 +172,8 @@ int main(int argc, char **argv)
 
 	handle_options(argc, argv);
 
+	osmo_signal_register_handler(SS_L_INPUT, sig_inp_cbfn, NULL);
+
 	rc = vty_read_config_file(g_config_file, NULL);
 	if (rc < 0)
 		exit(1);
diff --git a/src/recorder.h b/src/recorder.h
index 12bc993..458fb1d 100644
--- a/src/recorder.h
+++ b/src/recorder.h
@@ -17,6 +17,7 @@ enum rec_vty_node {
 };
 
 struct e1_recorder_line {
+	bool has_alarm;
 	struct {
 		bool enabled;
 		uint8_t line_nr;