add control-c-handler to rsutils

third-party/rsutils/include/rsutils/concurrency/control-c-handler.h

@@ -0,0 +1,25 @@
+// License: Apache 2.0. See LICENSE file in root directory.
+// Copyright(c) 2024 Intel Corporation. All Rights Reserved.
+#pragma once
+
+
+namespace rsutils {
+namespace concurrency {
+
+
+// A Python Event-like implementation, simplifying condition-variable and mutex access
+//
+class control_c_handler
+{
+public:
+    control_c_handler();
+    ~control_c_handler();
+
+    bool was_pressed() const;
+
+    void wait();
+};
+
+
+}  // namespace concurrency
+}  // namespace rsutils

third-party/rsutils/src/control-c-handler.cpp

@@ -0,0 +1,75 @@
+// License: Apache 2.0. See LICENSE file in root directory.
+// Copyright(c) 2024 Intel Corporation. All Rights Reserved.
+#include <rsutils/concurrency/control-c-handler.h>
+#include <rsutils/concurrency/event.h>
+#include <rsutils/easylogging/easyloggingpp.h>
+
+#include <signal.h>
+
+
+namespace rsutils {
+namespace concurrency {
+
+
+namespace {
+
+event sigint_ev;
+
+
+void handle_signal( int signal )
+{
+    switch( signal )
+    {
+    case SIGINT:
+        sigint_ev.set();
+        break;
+    }
+}
+
+}  // namespace
+
+
+control_c_handler::control_c_handler()
+{
+#ifdef _WIN32
+    signal( SIGINT, handle_signal );
+#else
+    struct sigaction sa;
+    sa.sa_handler = &handle_signal;
+    sa.sa_flags = SA_RESTART;
+    sigfillset( &sa.sa_mask );
+    if( sigaction( SIGINT, &sa, NULL ) == -1 )
+        LOG_ERROR( "Cannot install SIGINT handler" );
+#endif
+}
+
+
+control_c_handler::~control_c_handler()
+{
+#ifdef _WIN32
+    signal( SIGINT, SIG_DFL );
+#else
+    struct sigaction sa;
+    sa.sa_handler = SIG_DFL;
+    sa.sa_flags = SA_RESTART;
+    sigfillset( &sa.sa_mask );
+    if( sigaction( SIGINT, &sa, NULL ) == -1 )
+        LOG_DEBUG( "cannot uninstall SIGINT handler" );
+#endif
+}
+
+
+bool control_c_handler::was_pressed() const
+{
+    return sigint_ev.is_set();
+}
+
+
+void control_c_handler::wait()
+{
+    sigint_ev.clear_and_wait();
+}
+
+
+}  // namespace concurrency
+}  // namespace rsutils