| // Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "update_engine/file_descriptor.h" |
| |
| #include <fcntl.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| |
| #include <base/eintr_wrapper.h> |
| |
| namespace chromeos_update_engine { |
| |
| bool EintrSafeFileDescriptor::Open(const char* path, int flags, mode_t mode) { |
| CHECK_EQ(fd_, -1); |
| return ((fd_ = HANDLE_EINTR(open(path, flags, mode))) >= 0); |
| } |
| |
| bool EintrSafeFileDescriptor::Open(const char* path, int flags) { |
| CHECK_EQ(fd_, -1); |
| return ((fd_ = HANDLE_EINTR(open(path, flags))) >= 0); |
| } |
| |
| ssize_t EintrSafeFileDescriptor::Read(void* buf, size_t count) { |
| CHECK_GE(fd_, 0); |
| return HANDLE_EINTR(read(fd_, buf, count)); |
| } |
| |
| ssize_t EintrSafeFileDescriptor::Write(const void* buf, size_t count) { |
| CHECK_GE(fd_, 0); |
| |
| // Attempt repeated writes, as long as some progress is being made. |
| char* char_buf = const_cast<char*>(reinterpret_cast<const char*>(buf)); |
| ssize_t written = 0; |
| while (count > 0) { |
| ssize_t ret = HANDLE_EINTR(write(fd_, char_buf, count)); |
| |
| // Fail on either an error or no progress. |
| if (ret <= 0) |
| return (written ? written : ret); |
| written += ret; |
| count -= ret; |
| char_buf += ret; |
| } |
| return written; |
| } |
| |
| bool EintrSafeFileDescriptor::Close() { |
| CHECK_GE(fd_, 0); |
| int ret = HANDLE_EINTR(close(fd_)); |
| if (!ret) |
| fd_ = -1; |
| return !ret; |
| } |
| |
| } // namespace chromeos_update_engine |