File-based stats: abort writing if we can't write

There might be a number of reasons, such as read-only write system,
erros, etc. Still gracefully continue instead of aborting the operation.

executables/nr-gnb.c

@@ -267,9 +267,11 @@ void *nrL1_stats_thread(void *param) {
   char output[L1STATSSTRLEN];
   memset(output,0,L1STATSSTRLEN);
   wait_sync("L1_stats_thread");
-  FILE *fd;
+  FILE *fd=fopen("nrL1_stats.log","w");
-  fd=fopen("nrL1_stats.log","w");
+  if (!fd) {
-  AssertFatal(fd!=NULL,"Cannot open nrL1_stats.log\n");
+    LOG_W(NR_PHY, "Cannot open nrL1_stats.log: %d, %s\n", errno, strerror(errno));
+    return NULL;
+  }
 
   reset_meas(&gNB->phy_proc_tx);
   reset_meas(&gNB->dlsch_encoding_stats);

openair2/LAYER2/NR_MAC_gNB/main.c

@@ -79,7 +79,10 @@ void *nrmac_stats_thread(void *arg) {
   char output[MACSTATSSTRLEN] = {0};
   const char *end = output + MACSTATSSTRLEN;
   FILE *file = fopen("nrMAC_stats.log","w");
-  AssertFatal(file!=NULL,"Cannot open nrMAC_stats.log, error %s\n",strerror(errno));
+  if (!file) {
+    LOG_W(NR_MAC, "Cannot open nrMAC_stats.log: %d, %s\n", errno, strerror(errno));
+    return NULL;
+  }
 
   while (oai_exit == 0) {
     char *p = output;

openair2/RRC/NR/rrc_gNB.c

@@ -2481,13 +2481,13 @@ static const char *get_pdusession_status_text(pdu_session_status_t status)
   return "illegal";
 }
 
-static void write_rrc_stats(const gNB_RRC_INST *rrc)
+static bool write_rrc_stats(const gNB_RRC_INST *rrc)
 {
   const char *filename = "nrRRC_stats.log";
   FILE *f = fopen(filename, "w");
   if (f == NULL) {
-    LOG_E(NR_RRC, "cannot open %s for writing\n", filename);
+    LOG_W(NR_RRC, "cannot open %s for writing: %d, %s\n", filename, errno, strerror(errno));
-    return;
+    return false;
   }
 
   time_t now = time(NULL);
@@ -2538,6 +2538,7 @@ static void write_rrc_stats(const gNB_RRC_INST *rrc)
   dump_du_info(rrc, f);
 
   fclose(f);
+  return true;
 }
 
 void *rrc_gnb_task(void *args_p) {
@@ -2576,10 +2577,12 @@ void *rrc_gnb_task(void *args_p) {
         break;
 
       case TIMER_HAS_EXPIRED:
-        if (TIMER_HAS_EXPIRED(msg_p).timer_id == stats_timer_id)
+        if (TIMER_HAS_EXPIRED(msg_p).timer_id == stats_timer_id) {
-          write_rrc_stats(RC.nrrrc[0]);
+          if (!write_rrc_stats(RC.nrrrc[0]))
-        else
+            timer_remove(stats_timer_id);
+        } else {
           itti_send_msg_to_task(TASK_RRC_GNB, 0, TIMER_HAS_EXPIRED(msg_p).arg); /* see rrc_gNB_process_NGAP_PDUSESSION_SETUP_REQ() */
+        }
         break;
 
       case F1AP_INITIAL_UL_RRC_MESSAGE: