Delete move constructor and move assignment operator explictly for mac_pcap_base and s1ap_pcap classes.

Move emergency handlers header file into the support folder.

Refactored signal handling:
- Remove the dependency with the running static variable in the header file.
- Move implementations down to cc files.
- Allow specifying a new signal handler that will be used to stop the applications.
- Move signal handling files to support.

lib/include/srsran/common/mac_pcap_base.h

@@ -31,6 +31,8 @@ public:
 
   mac_pcap_base(const mac_pcap_base& other) = delete;
   mac_pcap_base& operator=(const mac_pcap_base& other) = delete;
+  mac_pcap_base(mac_pcap_base&& other)                 = delete;
+  mac_pcap_base& operator=(mac_pcap_base&& other) = delete;
 
   ~mac_pcap_base();
   void             enable(bool enable);

lib/include/srsran/common/s1ap_pcap.h

@@ -24,6 +24,8 @@ public:
   s1ap_pcap();
   s1ap_pcap(const s1ap_pcap& other) = delete;
   s1ap_pcap& operator=(const s1ap_pcap& other) = delete;
+  s1ap_pcap(s1ap_pcap&& other)                 = delete;
+  s1ap_pcap& operator=(s1ap_pcap&& other) = delete;
 
   void enable();
   void open(const char* filename_);

lib/include/srsran/support/signal_handler.h

@@ -0,0 +1,27 @@
+/**
+ *
+ * \section COPYRIGHT
+ *
+ * Copyright 2013-2021 Software Radio Systems Limited
+ *
+ * By using this file, you agree to the terms and conditions set
+ * forth in the LICENSE file which can be found at the top level of
+ * the distribution.
+ *
+ */
+
+/**
+ * @file signal_handler.h
+ * @brief Common signal handling methods for all srsRAN applications.
+ */
+
+#ifndef SRSRAN_SIGNAL_HANDLER_H
+#define SRSRAN_SIGNAL_HANDLER_H
+
+using srsran_signal_hanlder = void (*)();
+
+/// Registers the specified function to be called when the user interrupts the program execution (eg: via Ctrl+C).
+/// Passing a null function pointer disables the current installed handler.
+void srsran_register_signal_handler(srsran_signal_hanlder handler);
+
+#endif // SRSRAN_SIGNAL_HANDLER_H

lib/src/CMakeLists.txt

@@ -15,4 +15,5 @@ add_subdirectory(rlc)
 add_subdirectory(pdcp)
 add_subdirectory(gtpu)
 add_subdirectory(srslog)
+add_subdirectory(support)
 add_subdirectory(system)

lib/src/common/CMakeLists.txt

@@ -28,7 +28,6 @@ set(SOURCES arch_select.cc
             rlc_pcap.cc
             s1ap_pcap.cc
             security.cc
-            emergency_handlers.cc
             standard_streams.cc
             thread_pool.cc
             threads.c
@@ -48,7 +47,7 @@ add_dependencies(srsran_common gen_build_info)
 add_executable(arch_select arch_select.cc)
 
 target_include_directories(srsran_common PUBLIC ${SEC_INCLUDE_DIRS} ${CMAKE_SOURCE_DIR} ${BACKWARD_INCLUDE_DIRS})
-target_link_libraries(srsran_common srsran_phy srslog ${SEC_LIBRARIES} ${BACKWARD_LIBRARIES} ${SCTP_LIBRARIES})
+target_link_libraries(srsran_common srsran_phy support srslog ${SEC_LIBRARIES} ${BACKWARD_LIBRARIES} ${SCTP_LIBRARIES})
 target_compile_definitions(srsran_common PRIVATE ${BACKWARD_DEFINITIONS})
 
 INSTALL(TARGETS srsran_common DESTINATION ${LIBRARY_DIR})

lib/src/common/mac_pcap_base.cc

@@ -11,9 +11,9 @@
  */
 
 #include "srsran/common/mac_pcap_base.h"
-#include "srsran/common/emergency_handlers.h"
 #include "srsran/config.h"
 #include "srsran/phy/common/phy_common.h"
+#include "srsran/support/emergency_handlers.h"
 #include <stdint.h>
 
 namespace srsran {

lib/src/common/s1ap_pcap.cc

@@ -11,9 +11,9 @@
  */
 
 #include "srsran/common/s1ap_pcap.h"
-#include "srsran/common/emergency_handlers.h"
 #include "srsran/common/pcap.h"
 #include "srsran/srsran.h"
+#include "srsran/support/emergency_handlers.h"
 #include <stdint.h>
 
 namespace srsran {

lib/src/support/CMakeLists.txt

@@ -0,0 +1,12 @@
+#
+# Copyright 2013-2021 Software Radio Systems Limited
+#
+# By using this file, you agree to the terms and conditions set
+# forth in the LICENSE file which can be found at the top level of
+# the distribution.
+#
+
+set(SOURCES emergency_handlers.cc
+            signal_handler.cc)
+
+add_library(support STATIC ${SOURCES})

lib/src/support/emergency_handlers.cc

@@ -10,7 +10,7 @@
  *
  */
 
-#include "srsran/common/emergency_handlers.h"
+#include "srsran/support/emergency_handlers.h"
 #include "srsran/support/srsran_assert.h"
 
 namespace {

lib/src/support/signal_handler.cc

@@ -10,28 +10,17 @@
  *
  */
 
-/**
- * @file signal_handler.h
- * @brief Common signal handling methods for all srsRAN applications.
- */
-
-#ifndef SRSRAN_SIGNAL_HANDLER_H
-#define SRSRAN_SIGNAL_HANDLER_H
-
-#include "srsran/common/emergency_handlers.h"
-#include "srsran/srslog/sink.h"
-#include "srsran/srslog/srslog.h"
-#include <signal.h>
-#include <stdio.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif // __cplusplus
+#include "srsran/support/signal_handler.h"
+#include "srsran/support/emergency_handlers.h"
+#include <atomic>
+#include <csignal>
+#include <cstdio>
+#include <unistd.h>
 
 #define SRSRAN_TERM_TIMEOUT_S (5)
 
-// static vars required by signal handling
-static std::atomic<bool> running = {true};
+/// Handler called after the user interrupts the program.
+static std::atomic<srsran_signal_hanlder> user_handler;
 
 static void srsran_signal_handler(int signal)
 {
@@ -42,26 +31,24 @@ static void srsran_signal_handler(int signal)
       raise(SIGKILL);
     default:
       // all other registered signals try to stop the app gracefully
-      if (running) {
-        running = false;
-        fprintf(stdout, "Stopping ..\n");
-        alarm(SRSRAN_TERM_TIMEOUT_S);
+      // Call the user handler if present and remove it so that further signals are treated by the default handler.
+      if (auto handler = user_handler.exchange(nullptr)) {
+        handler();
       } else {
-        // already waiting for alarm to go off ..
+        return;
       }
+      fprintf(stdout, "Stopping ..\n");
+      alarm(SRSRAN_TERM_TIMEOUT_S);
       break;
   }
 }
 
-void srsran_register_signal_handler()
+void srsran_register_signal_handler(srsran_signal_hanlder handler)
 {
+  user_handler.store(handler);
+
   signal(SIGINT, srsran_signal_handler);
   signal(SIGTERM, srsran_signal_handler);
   signal(SIGHUP, srsran_signal_handler);
   signal(SIGALRM, srsran_signal_handler);
 }
-
-#ifdef __cplusplus
-}
-#endif // __cplusplus
-#endif // SRSRAN_SIGNAL_HANDLER_H

srsenb/src/CMakeLists.txt

@@ -27,7 +27,7 @@ target_link_libraries(enb_cfg_parser srsran_common ${LIBCONFIGPP_LIBRARIES})
 add_executable(srsenb main.cc enb.cc metrics_stdout.cc metrics_csv.cc metrics_json.cc)
 
 set(SRSENB_SOURCES srsenb_phy srsenb_stack srsenb_common srsenb_s1ap srsenb_upper srsenb_mac srsenb_rrc srslog system)
-set(SRSRAN_SOURCES srsran_common srsran_mac srsran_phy srsran_gtpu srsran_rlc srsran_pdcp srsran_radio rrc_asn1 s1ap_asn1 enb_cfg_parser srslog system)
+set(SRSRAN_SOURCES srsran_common srsran_mac srsran_phy srsran_gtpu srsran_rlc srsran_pdcp srsran_radio rrc_asn1 s1ap_asn1 enb_cfg_parser srslog support system)
 
 set(SRSENB_SOURCES ${SRSENB_SOURCES} srsgnb_stack srsgnb_ngap srsgnb_upper srsgnb_mac srsgnb_rrc)
 set(SRSRAN_SOURCES ${SRSRAN_SOURCES} rrc_nr_asn1 ngap_nr_asn1)

srsenb/src/main.cc

@@ -20,10 +20,11 @@
 #include "srsran/common/common_helper.h"
 #include "srsran/common/config_file.h"
 #include "srsran/common/crash_handler.h"
-#include "srsran/common/signal_handler.h"
 #include "srsran/common/tsan_options.h"
 #include "srsran/srslog/event_trace.h"
 #include "srsran/srslog/srslog.h"
+#include "srsran/support/emergency_handlers.h"
+#include "srsran/support/signal_handler.h"
 
 #include <boost/program_options.hpp>
 #include <boost/program_options/parsers.hpp>
@@ -45,9 +46,10 @@ namespace bpo = boost::program_options;
 /**********************************************************************
  *  Program arguments processing
  ***********************************************************************/
-string               config_file;
-static bool          stdout_ts_enable = false;
-static srslog::sink* log_sink         = nullptr;
+string                   config_file;
+static bool              stdout_ts_enable = false;
+static srslog::sink*     log_sink         = nullptr;
+static std::atomic<bool> running          = {true};
 
 void parse_args(all_args_t* args, int argc, char* argv[])
 {
@@ -545,9 +547,14 @@ static void     emergency_cleanup_handler(void* data)
   srsran_dft_exit();
 }
 
+static void signal_handler()
+{
+  running = false;
+}
+
 int main(int argc, char* argv[])
 {
-  srsran_register_signal_handler();
+  srsran_register_signal_handler(signal_handler);
   add_emergency_cleanup_handler(emergency_cleanup_handler, nullptr);
 
   all_args_t                         args = {};

srsepc/src/CMakeLists.txt

@@ -31,6 +31,7 @@ target_link_libraries( srsepc  srsepc_mme
                                srsran_asn1
                                srsran_common
                                srslog
+                               support
                                ${CMAKE_THREAD_LIBS_INIT}
                                ${Boost_LIBRARIES}
                                ${SEC_LIBRARIES}

srsepc/src/main.cc

@@ -18,9 +18,10 @@
 #include "srsran/common/common_helper.h"
 #include "srsran/common/config_file.h"
 #include "srsran/common/crash_handler.h"
-#include "srsran/common/signal_handler.h"
 #include "srsran/srslog/srslog.h"
 #include "srsran/srsran.h"
+#include "srsran/support/emergency_handlers.h"
+#include "srsran/support/signal_handler.h"
 #include <boost/program_options.hpp>
 #include <iostream>
 
@@ -55,7 +56,8 @@ typedef struct {
   log_args_t  log_args;
 } all_args_t;
 
-static srslog::sink* log_sink = nullptr;
+static srslog::sink*     log_sink = nullptr;
+static std::atomic<bool> running  = {true};
 
 /**********************************************************************
  *  Program arguments processing
@@ -363,9 +365,14 @@ static void emergency_cleanup_handler(void* data)
   }
 }
 
+static void signal_handler()
+{
+  running = false;
+}
+
 int main(int argc, char* argv[])
 {
-  srsran_register_signal_handler();
+  srsran_register_signal_handler(signal_handler);
   add_emergency_cleanup_handler(emergency_cleanup_handler, nullptr);
 
   // print build info

srsue/src/CMakeLists.txt

@@ -22,7 +22,7 @@ endif (RPATH)
 add_executable(srsue main.cc ue.cc metrics_stdout.cc metrics_csv.cc metrics_json.cc)
 
 set(SRSUE_SOURCES srsue_phy srsue_stack srsue_upper srsue_mac srsue_rrc srslog system)
-set(SRSRAN_SOURCES srsran_common srsran_mac srsran_phy srsran_radio srsran_gtpu srsran_rlc srsran_pdcp rrc_asn1 srslog system)
+set(SRSRAN_SOURCES srsran_common srsran_mac srsran_phy srsran_radio srsran_gtpu srsran_rlc srsran_pdcp rrc_asn1 srslog support system)
 
 set(SRSUE_SOURCES ${SRSUE_SOURCES} srsue_nr_stack srsue_rrc_nr srsue_mac_nr)
 set(SRSRAN_SOURCES ${SRSRAN_SOURCES} rrc_nr_asn1 ngap_nr_asn1)

srsue/src/main.cc

@@ -15,11 +15,12 @@
 #include "srsran/common/crash_handler.h"
 #include "srsran/common/metrics_hub.h"
 #include "srsran/common/multiqueue.h"
-#include "srsran/common/signal_handler.h"
 #include "srsran/common/tsan_options.h"
 #include "srsran/srslog/event_trace.h"
 #include "srsran/srslog/srslog.h"
 #include "srsran/srsran.h"
+#include "srsran/support/emergency_handlers.h"
+#include "srsran/support/signal_handler.h"
 #include "srsran/version.h"
 #include "srsue/hdr/metrics_csv.h"
 #include "srsue/hdr/metrics_json.h"
@@ -27,6 +28,7 @@
 #include "srsue/hdr/ue.h"
 #include <boost/program_options.hpp>
 #include <boost/program_options/parsers.hpp>
+#include <csignal>
 #include <iostream>
 #include <pthread.h>
 #include <stdio.h>
@@ -45,9 +47,10 @@ namespace bpo = boost::program_options;
  *  Local static variables
  ***********************************************************************/
 
-static bool            do_metrics     = false;
-static metrics_stdout* metrics_screen = nullptr;
-static srslog::sink*   log_sink       = nullptr;
+static bool              do_metrics     = false;
+static metrics_stdout*   metrics_screen = nullptr;
+static srslog::sink*     log_sink       = nullptr;
+static std::atomic<bool> running        = {true};
 
 /**********************************************************************
  *  Program arguments processing
@@ -667,9 +670,14 @@ static void     emergency_cleanup_handler(void* data)
   srsran_dft_exit();
 }
 
+static void signal_handler()
+{
+  running = false;
+}
+
 int main(int argc, char* argv[])
 {
-  srsran_register_signal_handler();
+  srsran_register_signal_handler(signal_handler);
   add_emergency_cleanup_handler(emergency_cleanup_handler, nullptr);
   srsran_debug_handle_crash(argc, argv);