Add get_executable_name() function

CMakeLists.txt

@@ -78,6 +78,9 @@ if(BUILD_TESTING)
 
   ament_add_gtest(test_pointer_traits test/test_pointer_traits.cpp)
 
+  ament_add_gtest(test_process test/test_process.cpp)
+  ament_target_dependencies(test_process rcutils)
+
   set(append_library_dirs "$<TARGET_FILE_DIR:${PROJECT_NAME}>")
 
   ament_add_gtest(test_shared_library test/test_shared_library.cpp

include/rcpputils/process.hpp

@@ -0,0 +1,49 @@
+// Copyright 2020 Open Source Robotics Foundation, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef RCPPUTILS__PROCESS_HPP_
+#define RCPPUTILS__PROCESS_HPP_
+
+#include <rcutils/process.h>
+
+#include <string>
+
+namespace rcpputils
+{
+
+/// Retrieve the current executable name.
+/**
+ * This function portably retrieves the current program name and returns
+ * a copy of it.
+ *
+ * This function is thread-safe.
+ *
+ * \return The program name.
+ * \throws std::runtime_error on error
+ */
+std::string get_executable_name()
+{
+  rcutils_allocator_t allocator = rcutils_get_default_allocator();
+  char * executable_name = rcutils_get_executable_name(allocator);
+  if (nullptr == executable_name) {
+    throw std::runtime_error("Failed to get executable name");
+  }
+  std::string ret(executable_name);
+  allocator.deallocate(executable_name, allocator.state);
+  return ret;
+}
+
+}  // namespace rcpputils
+
+#endif  // RCPPUTILS__PROCESS_HPP_

test/test_process.cpp

@@ -0,0 +1,23 @@
+// Copyright 2020 Open Source Robotics Foundation, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <gtest/gtest.h>
+
+#include <string>
+
+#include "rcpputils/process.hpp"
+
+TEST(TestProcess, test_get_executable_name) {
+  EXPECT_STREQ("test_process", rcpputils::get_executable_name().c_str());
+}