rsCppUtils.cpp revision 7974fc03e11f3a8dd40f794f3b33b4889483090c
1/* 2 * Copyright (C) 2013 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 "rsUtils.h" 18#include "rsCppUtils.h" 19 20#include <string> 21 22#include <string.h> 23 24#ifndef RS_COMPATIBILITY_LIB 25#include <sys/wait.h> 26#endif 27 28#include <unistd.h> 29 30namespace android { 31namespace renderscript { 32 33const char * rsuCopyString(const char *name) { 34 return rsuCopyString(name, strlen(name)); 35} 36 37const char * rsuCopyString(const char *name, size_t len) { 38 char *n = new char[len+1]; 39 memcpy(n, name, len); 40 n[len] = 0; 41 return n; 42} 43 44const char* rsuJoinStrings(int n, const char* const* strs) { 45 std::string tmp; 46 for (int i = 0; i < n; i++) { 47 if (i > 0) { 48 tmp.append(" "); 49 } 50 tmp.append(strs[i]); 51 } 52 return strndup(tmp.c_str(), tmp.size()); 53} 54 55#ifndef RS_COMPATIBILITY_LIB 56bool rsuExecuteCommand(const char *exe, int nArgs, const char * const *args) { 57 std::unique_ptr<const char> joined(rsuJoinStrings(nArgs, args)); 58 ALOGV("Invoking %s with args '%s'", exe, joined.get()); 59 60 pid_t pid = fork(); 61 62 switch (pid) { 63 case -1: { // Error occurred (we attempt no recovery) 64 ALOGE("Fork of \"%s\" failed with error %s", exe, strerror(errno)); 65 return false; 66 } 67 case 0: { // Child process 68 // No (direct or indirect) call to malloc between fork and exec. It is 69 // possible that a different thread holds the heap lock before the fork. 70 71 // ProcessManager in libcore can reap unclaimed SIGCHLDs in its process 72 // group. To ensure that the exit signal is not caught by 73 // ProcessManager and instead sent to libRS, set the child's PGID to its 74 // PID. 75 setpgid(0, 0); 76 77 execv(exe, (char * const *)args); 78 79 ALOGE("execv() failed: %s", strerror(errno)); 80 abort(); 81 return false; 82 } 83 default: { // Parent process (actual driver) 84 // Wait on child process to finish execution. 85 int status = 0; 86 pid_t w = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0)); 87 if (w == -1) { 88 ALOGE("Waitpid of \"%s\" failed with error %s", exe, 89 strerror(errno)); 90 return false; 91 } 92 93 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { 94 return true; 95 } 96 97 ALOGE("Child process \"%s\" terminated with status %d", exe, status); 98 return false; 99 } 100 } 101} 102#endif // RS_COMPATIBILITY_LIB 103 104} // namespace renderscript 105} // namespace android 106