1 // 2 // Copyright 2019 The Abseil Authors. 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // https://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 16 #include "absl/flags/internal/program_name.h" 17 18 #include <string> 19 20 #include "absl/base/attributes.h" 21 #include "absl/base/config.h" 22 #include "absl/base/no_destructor.h" 23 #include "absl/base/thread_annotations.h" 24 #include "absl/flags/internal/path_util.h" 25 #include "absl/strings/string_view.h" 26 #include "absl/synchronization/mutex.h" 27 28 namespace absl { 29 ABSL_NAMESPACE_BEGIN 30 namespace flags_internal { 31 ProgramNameMutex()32static absl::Mutex* ProgramNameMutex() { 33 static absl::NoDestructor<absl::Mutex> mutex; 34 return mutex.get(); 35 } 36 ABSL_CONST_INIT static std::string* program_name ABSL_GUARDED_BY( 37 ProgramNameMutex()) ABSL_PT_GUARDED_BY(ProgramNameMutex()) = nullptr; 38 ProgramInvocationName()39std::string ProgramInvocationName() { 40 absl::MutexLock l(ProgramNameMutex()); 41 return program_name ? *program_name : "UNKNOWN"; 42 } 43 ShortProgramInvocationName()44std::string ShortProgramInvocationName() { 45 absl::MutexLock l(ProgramNameMutex()); 46 return program_name ? std::string(flags_internal::Basename(*program_name)) 47 : "UNKNOWN"; 48 } 49 SetProgramInvocationName(absl::string_view prog_name_str)50void SetProgramInvocationName(absl::string_view prog_name_str) { 51 absl::MutexLock l(ProgramNameMutex()); 52 if (!program_name) { 53 program_name = new std::string(prog_name_str); 54 } else { 55 program_name->assign(prog_name_str.data(), prog_name_str.size()); 56 } 57 } 58 59 } // namespace flags_internal 60 ABSL_NAMESPACE_END 61 } // namespace absl 62