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e7fe120d8b
ProcessMemory::ReadCStringInternal needs to be able to perform short reads. Change-Id: I2b2e1c2e6603d01235d8d2dbd15494375cd7f3f6 Reviewed-on: https://chromium-review.googlesource.com/874776 Commit-Queue: Joshua Peraza <jperaza@chromium.org> Reviewed-by: Mark Mentovai <mark@chromium.org> Reviewed-by: Scott Graham <scottmg@chromium.org>
65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
// Copyright 2017 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/process/process_memory_linux.h"
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <algorithm>
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#include <limits>
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#include "base/logging.h"
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#include "base/posix/eintr_wrapper.h"
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namespace crashpad {
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ProcessMemoryLinux::ProcessMemoryLinux()
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: ProcessMemory(), mem_fd_(), pid_(-1), initialized_() {}
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ProcessMemoryLinux::~ProcessMemoryLinux() {}
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bool ProcessMemoryLinux::Initialize(pid_t pid) {
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INITIALIZATION_STATE_SET_INITIALIZING(initialized_);
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pid_ = pid;
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char path[32];
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snprintf(path, sizeof(path), "/proc/%d/mem", pid_);
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mem_fd_.reset(HANDLE_EINTR(open(path, O_RDONLY | O_NOCTTY | O_CLOEXEC)));
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if (!mem_fd_.is_valid()) {
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PLOG(ERROR) << "open";
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return false;
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}
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INITIALIZATION_STATE_SET_VALID(initialized_);
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return true;
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}
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ssize_t ProcessMemoryLinux::ReadUpTo(VMAddress address,
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size_t size,
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void* buffer) const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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DCHECK(mem_fd_.is_valid());
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DCHECK_LE(size, size_t{std::numeric_limits<ssize_t>::max()});
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ssize_t bytes_read =
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HANDLE_EINTR(pread64(mem_fd_.get(), buffer, size, address));
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if (bytes_read < 0) {
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PLOG(ERROR) << "pread64";
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}
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return bytes_read;
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}
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} // namespace crashpad
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