| // Copyright 2020 The Crashpad Authors. All rights reserved. |
| // |
| // Licensed 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 "util/mac/sysctl.h" |
| |
| #include <errno.h> |
| #include <sys/sysctl.h> |
| #include <sys/types.h> |
| |
| #include "base/check_op.h" |
| #include "base/logging.h" |
| |
| namespace crashpad { |
| |
| std::string ReadStringSysctlByName(const char* name, bool may_log_enoent) { |
| size_t buf_len; |
| if (sysctlbyname(name, nullptr, &buf_len, nullptr, 0) != 0) { |
| PLOG_IF(WARNING, may_log_enoent || errno != ENOENT) |
| << "sysctlbyname (size) " << name; |
| return std::string(); |
| } |
| |
| DCHECK_GE(buf_len, 1u); |
| |
| std::string value(buf_len - 1, '\0'); |
| if (sysctlbyname(name, &value[0], &buf_len, nullptr, 0) != 0) { |
| PLOG(WARNING) << "sysctlbyname " << name; |
| return std::string(); |
| } |
| |
| DCHECK_EQ(value[buf_len - 1], '\0'); |
| |
| return value; |
| } |
| |
| } // namespace crashpad |