101 lines
3.2 KiB
C++
101 lines
3.2 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "exec_utils.h"
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <string>
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#include <vector>
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#include "android-base/stringprintf.h"
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#include "android-base/strings.h"
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#include "runtime.h"
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namespace art {
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using android::base::StringPrintf;
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int ExecAndReturnCode(std::vector<std::string>& arg_vector, std::string* error_msg) {
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const std::string command_line(android::base::Join(arg_vector, ' '));
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CHECK_GE(arg_vector.size(), 1U) << command_line;
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// Convert the args to char pointers.
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const char* program = arg_vector[0].c_str();
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std::vector<char*> args;
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for (size_t i = 0; i < arg_vector.size(); ++i) {
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const std::string& arg = arg_vector[i];
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char* arg_str = const_cast<char*>(arg.c_str());
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CHECK(arg_str != nullptr) << i;
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args.push_back(arg_str);
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}
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args.push_back(nullptr);
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// fork and exec
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pid_t pid = fork();
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if (pid == 0) {
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// no allocation allowed between fork and exec
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// change process groups, so we don't get reaped by ProcessManager
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setpgid(0, 0);
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// (b/30160149): protect subprocesses from modifications to LD_LIBRARY_PATH, etc.
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// Use the snapshot of the environment from the time the runtime was created.
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char** envp = (Runtime::Current() == nullptr) ? nullptr : Runtime::Current()->GetEnvSnapshot();
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if (envp == nullptr) {
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execv(program, &args[0]);
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} else {
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execve(program, &args[0], envp);
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}
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PLOG(ERROR) << "Failed to execve(" << command_line << ")";
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// _exit to avoid atexit handlers in child.
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_exit(1);
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} else {
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if (pid == -1) {
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*error_msg = StringPrintf("Failed to execv(%s) because fork failed: %s",
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command_line.c_str(), strerror(errno));
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return -1;
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}
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// wait for subprocess to finish
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int status = -1;
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pid_t got_pid = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0));
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if (got_pid != pid) {
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*error_msg = StringPrintf("Failed after fork for execv(%s) because waitpid failed: "
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"wanted %d, got %d: %s",
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command_line.c_str(), pid, got_pid, strerror(errno));
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return -1;
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}
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if (WIFEXITED(status)) {
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return WEXITSTATUS(status);
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}
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return -1;
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}
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}
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bool Exec(std::vector<std::string>& arg_vector, std::string* error_msg) {
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int status = ExecAndReturnCode(arg_vector, error_msg);
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if (status != 0) {
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const std::string command_line(android::base::Join(arg_vector, ' '));
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*error_msg = StringPrintf("Failed execv(%s) because non-0 exit status",
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command_line.c_str());
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return false;
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}
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return true;
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}
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} // namespace art
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