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76 lines
2.0 KiB
76 lines
2.0 KiB
4 months ago
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/*
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* Copyright (C) 2015 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 "android-base/test_utils.h"
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <string>
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#include <android-base/file.h>
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#include <android-base/logging.h>
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CapturedStdFd::CapturedStdFd(int std_fd) : std_fd_(std_fd), old_fd_(-1) {
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Start();
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}
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CapturedStdFd::~CapturedStdFd() {
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if (old_fd_ != -1) {
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Stop();
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}
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}
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int CapturedStdFd::fd() const {
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return temp_file_.fd;
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}
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std::string CapturedStdFd::str() {
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std::string result;
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CHECK_EQ(0, TEMP_FAILURE_RETRY(lseek(fd(), 0, SEEK_SET)));
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android::base::ReadFdToString(fd(), &result);
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return result;
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}
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void CapturedStdFd::Reset() {
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// Do not reset while capturing.
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CHECK_EQ(-1, old_fd_);
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CHECK_EQ(0, TEMP_FAILURE_RETRY(lseek(fd(), 0, SEEK_SET)));
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CHECK_EQ(0, ftruncate(fd(), 0));
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}
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void CapturedStdFd::Start() {
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#if defined(_WIN32)
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// On Windows, stderr is often buffered, so make sure it is unbuffered so
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// that we can immediately read back what was written to stderr.
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if (std_fd_ == STDERR_FILENO) CHECK_EQ(0, setvbuf(stderr, nullptr, _IONBF, 0));
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#endif
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old_fd_ = dup(std_fd_);
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CHECK_NE(-1, old_fd_);
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CHECK_NE(-1, dup2(fd(), std_fd_));
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}
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void CapturedStdFd::Stop() {
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CHECK_NE(-1, old_fd_);
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CHECK_NE(-1, dup2(old_fd_, std_fd_));
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close(old_fd_);
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old_fd_ = -1;
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// Note: cannot restore prior setvbuf() setting.
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}
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