mirror of
https://github.com/chromium/crashpad.git
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136 lines
3.3 KiB
C++
136 lines
3.3 KiB
C++
// Copyright 2014 The Crashpad Authors. All rights reserved.
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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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#include "util/file/fd_io.h"
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#include <unistd.h>
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#include "base/logging.h"
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#include "base/numerics/safe_conversions.h"
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#include "base/posix/eintr_wrapper.h"
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namespace {
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struct ReadTraits {
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using VoidBufferType = void*;
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using CharBufferType = char*;
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static ssize_t Operate(int fd, CharBufferType buffer, size_t size) {
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return read(fd, buffer, size);
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}
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};
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struct WriteTraits {
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using VoidBufferType = const void*;
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using CharBufferType = const char*;
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static ssize_t Operate(int fd, CharBufferType buffer, size_t size) {
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return write(fd, buffer, size);
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}
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};
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template <typename Traits>
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ssize_t ReadOrWrite(int fd,
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typename Traits::VoidBufferType buffer,
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size_t size) {
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typename Traits::CharBufferType buffer_c =
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reinterpret_cast<typename Traits::CharBufferType>(buffer);
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ssize_t total_bytes = 0;
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while (size > 0) {
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ssize_t bytes = HANDLE_EINTR(Traits::Operate(fd, buffer_c, size));
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if (bytes < 0) {
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return bytes;
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} else if (bytes == 0) {
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break;
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}
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buffer_c += bytes;
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size -= bytes;
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total_bytes += bytes;
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}
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return total_bytes;
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}
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} // namespace
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namespace crashpad {
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ssize_t ReadFD(int fd, void* buffer, size_t size) {
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return ReadOrWrite<ReadTraits>(fd, buffer, size);
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}
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ssize_t WriteFD(int fd, const void* buffer, size_t size) {
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return ReadOrWrite<WriteTraits>(fd, buffer, size);
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}
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bool LoggingReadFD(int fd, void* buffer, size_t size) {
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ssize_t expect = base::checked_cast<ssize_t>(size);
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ssize_t rv = ReadFD(fd, buffer, size);
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if (rv < 0) {
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PLOG(ERROR) << "read";
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return false;
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}
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if (rv != expect) {
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LOG(ERROR) << "read: expected " << expect << ", observed " << rv;
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return false;
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}
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return true;
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}
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bool LoggingWriteFD(int fd, const void* buffer, size_t size) {
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ssize_t expect = base::checked_cast<ssize_t>(size);
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ssize_t rv = WriteFD(fd, buffer, size);
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if (rv < 0) {
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PLOG(ERROR) << "write";
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return false;
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}
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if (rv != expect) {
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LOG(ERROR) << "write: expected " << expect << ", observed " << rv;
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return false;
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}
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return true;
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}
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void CheckedReadFD(int fd, void* buffer, size_t size) {
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CHECK(LoggingReadFD(fd, buffer, size));
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}
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void CheckedWriteFD(int fd, const void* buffer, size_t size) {
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CHECK(LoggingWriteFD(fd, buffer, size));
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}
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void CheckedReadFDAtEOF(int fd) {
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char c;
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ssize_t rv = ReadFD(fd, &c, 1);
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if (rv < 0) {
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PCHECK(rv == 0) << "read";
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} else {
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CHECK_EQ(rv, 0) << "read";
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}
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}
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bool LoggingCloseFD(int fd) {
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int rv = IGNORE_EINTR(close(fd));
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PLOG_IF(ERROR, rv != 0) << "close";
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return rv == 0;
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}
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void CheckedCloseFD(int fd) {
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CHECK(LoggingCloseFD(fd));
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}
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} // namespace crashpad
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