| // Copyright (c) 2011, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| // memory_mapped_file.cc: Implement google_breakpad::MemoryMappedFile. |
| // See memory_mapped_file.h for details. |
| |
| #include "common/linux/memory_mapped_file.h" |
| |
| #include <fcntl.h> |
| #include <sys/mman.h> |
| #if defined(__ANDROID__) |
| #include <sys/stat.h> |
| #endif |
| #include <unistd.h> |
| |
| #include "common/memory_range.h" |
| #include "third_party/lss/linux_syscall_support.h" |
| |
| namespace google_breakpad { |
| |
| MemoryMappedFile::MemoryMappedFile() {} |
| |
| MemoryMappedFile::MemoryMappedFile(const char* path, size_t offset) { |
| Map(path, offset); |
| } |
| |
| MemoryMappedFile::~MemoryMappedFile() { |
| Unmap(); |
| } |
| |
| #include <unistd.h> |
| |
| bool MemoryMappedFile::Map(const char* path, size_t offset) { |
| Unmap(); |
| |
| int fd = sys_open(path, O_RDONLY, 0); |
| if (fd == -1) { |
| return false; |
| } |
| |
| #if defined(__x86_64__) || defined(__aarch64__) || \ |
| (defined(__mips__) && _MIPS_SIM == _ABI64) |
| |
| struct kernel_stat st; |
| if (sys_fstat(fd, &st) == -1 || st.st_size < 0) { |
| #else |
| struct kernel_stat64 st; |
| if (sys_fstat64(fd, &st) == -1 || st.st_size < 0) { |
| #endif |
| sys_close(fd); |
| return false; |
| } |
| |
| // Strangely file size can be negative, but we check above that it is not. |
| size_t file_len = static_cast<size_t>(st.st_size); |
| // If the file does not extend beyond the offset, simply use an empty |
| // MemoryRange and return true. Don't bother to call mmap() |
| // even though mmap() can handle an empty file on some platforms. |
| if (offset >= file_len) { |
| sys_close(fd); |
| return true; |
| } |
| |
| #if defined(__x86_64__) || defined(__aarch64__) || \ |
| (defined(__mips__) && _MIPS_SIM == _ABI64) |
| void* data = sys_mmap(NULL, file_len, PROT_READ, MAP_PRIVATE, fd, offset); |
| #else |
| if ((offset & 4095) != 0) { |
| // Not page aligned. |
| sys_close(fd); |
| return false; |
| } |
| void* data = sys_mmap2( |
| NULL, file_len, PROT_READ, MAP_PRIVATE, fd, offset >> 12); |
| #endif |
| sys_close(fd); |
| if (data == MAP_FAILED) { |
| return false; |
| } |
| |
| content_.Set(data, file_len - offset); |
| return true; |
| } |
| |
| void MemoryMappedFile::Unmap() { |
| if (content_.data()) { |
| sys_munmap(const_cast<uint8_t*>(content_.data()), content_.length()); |
| content_.Set(NULL, 0); |
| } |
| } |
| |
| } // namespace google_breakpad |