| /* Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 "charmony.h" |
| |
| #include "Lucy/Util/ProcessID.h" |
| |
| /********************************* WINDOWS ********************************/ |
| #if (defined(CHY_HAS_WINDOWS_H) && defined(CHY_HAS_PROCESS_H) && !defined(__CYGWIN__)) |
| |
| #include <windows.h> |
| #include <process.h> |
| |
| int |
| lucy_PID_getpid(void) { |
| return GetCurrentProcessId(); |
| } |
| |
| bool |
| lucy_PID_active(int pid) { |
| // Attempt to open a handle to the process with permissions to terminate |
| // -- but don't actually terminate. |
| HANDLE handle = OpenProcess(PROCESS_TERMINATE, false, pid); |
| if (handle != NULL) { |
| // Successful open, therefore process is active. |
| CloseHandle(handle); |
| return true; |
| } |
| // If the opening attempt fails because we were denied permission, assume |
| // that the process is active. |
| if (GetLastError() == ERROR_ACCESS_DENIED) { |
| return true; |
| } |
| |
| // Can't find any trace of the process, so return false. |
| return false; |
| } |
| |
| |
| /********************************* UNIXEN *********************************/ |
| #elif (defined(CHY_HAS_UNISTD_H) && defined(CHY_HAS_SIGNAL_H)) |
| |
| #include <sys/types.h> |
| #include <unistd.h> |
| #include <signal.h> |
| #include <errno.h> |
| |
| int |
| lucy_PID_getpid(void) { |
| return getpid(); |
| } |
| |
| bool |
| lucy_PID_active(int pid) { |
| if (kill(pid, 0) == 0) { |
| return true; // signal succeeded, therefore pid active |
| } |
| |
| if (errno != ESRCH) { |
| return true; // an error other than "pid not found", thus active |
| } |
| |
| return false; |
| } |
| |
| #else |
| #error "Can't find a known process ID API." |
| #endif // OS switch. |
| |
| |