1 /* 2 * Copyright 2018, The Android Open Source Project 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 * http://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 17 #include "fork.h" 18 19 #include "log.h" 20 21 #include <errno.h> 22 #include <string.h> 23 #include <sys/types.h> 24 #include <sys/wait.h> 25 #include <unistd.h> 26 27 bool forkAndExec(const char* argv[]) { 28 pid_t pid = ::fork(); 29 if (pid < 0) { 30 // Failed to fork 31 LOGE("fork() failed: %s", strerror(errno)); 32 return false; 33 } else if (pid == 0) { 34 // Child 35 char buffer[32768]; 36 size_t offset = 0; 37 for (size_t i = 0; argv[i]; ++i) { 38 offset += snprintf(buffer + offset, sizeof(buffer) - offset, 39 "%s ", argv[i]); 40 } 41 LOGE("Running '%s'", buffer); 42 execvp(argv[0], const_cast<char* const*>(argv)); 43 LOGE("Failed to run '%s': %s", argv[0], strerror(errno)); 44 _exit(1); 45 } else { 46 // Parent 47 int status = 0; 48 do { 49 ::waitpid(pid, &status, 0); 50 if (WIFEXITED(status)) { 51 int exitStatus = WEXITSTATUS(status); 52 if (exitStatus == 0) { 53 return true; 54 } 55 LOGE("Error: '%s' exited with code: %d", argv[0], exitStatus); 56 } else if (WIFSIGNALED(status)) { 57 LOGE("Error: '%s' terminated with signal: %d", 58 argv[0], WTERMSIG(status)); 59 } 60 // Other possibilities include being stopped and continued as part 61 // of a trace but we don't really care about that. The important 62 // part is that unless the process explicitly exited or was killed 63 // by a signal we have to keep waiting. 64 } while (!WIFEXITED(status) && !WIFSIGNALED(status)); 65 return false; 66 } 67 } 68
