155 lines
4.0 KiB
C++
155 lines
4.0 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/sync_socket.h"
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#include <errno.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#if defined(OS_SOLARIS)
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#include <sys/filio.h>
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#endif
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#include "base/file_util.h"
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#include "base/logging.h"
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namespace base {
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namespace {
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// To avoid users sending negative message lengths to Send/Receive
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// we clamp message lengths, which are size_t, to no more than INT_MAX.
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const size_t kMaxMessageLength = static_cast<size_t>(INT_MAX);
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} // namespace
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const SyncSocket::Handle SyncSocket::kInvalidHandle = -1;
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SyncSocket::SyncSocket() : handle_(kInvalidHandle) {}
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SyncSocket::~SyncSocket() {
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Close();
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}
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// static
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bool SyncSocket::CreatePair(SyncSocket* socket_a, SyncSocket* socket_b) {
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DCHECK(socket_a != socket_b);
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DCHECK(socket_a->handle_ == kInvalidHandle);
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DCHECK(socket_b->handle_ == kInvalidHandle);
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#if defined(OS_MACOSX)
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int nosigpipe = 1;
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#endif // defined(OS_MACOSX)
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Handle handles[2] = { kInvalidHandle, kInvalidHandle };
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, handles) != 0)
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goto cleanup;
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#if defined(OS_MACOSX)
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// On OSX an attempt to read or write to a closed socket may generate a
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// SIGPIPE rather than returning -1. setsockopt will shut this off.
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if (0 != setsockopt(handles[0], SOL_SOCKET, SO_NOSIGPIPE,
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&nosigpipe, sizeof nosigpipe) ||
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0 != setsockopt(handles[1], SOL_SOCKET, SO_NOSIGPIPE,
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&nosigpipe, sizeof nosigpipe)) {
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goto cleanup;
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}
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#endif
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// Copy the handles out for successful return.
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socket_a->handle_ = handles[0];
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socket_b->handle_ = handles[1];
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return true;
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cleanup:
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if (handles[0] != kInvalidHandle) {
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if (HANDLE_EINTR(close(handles[0])) < 0)
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DPLOG(ERROR) << "close";
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}
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if (handles[1] != kInvalidHandle) {
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if (HANDLE_EINTR(close(handles[1])) < 0)
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DPLOG(ERROR) << "close";
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}
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return false;
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}
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bool SyncSocket::Close() {
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if (handle_ == kInvalidHandle) {
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return false;
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}
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int retval = HANDLE_EINTR(close(handle_));
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if (retval < 0)
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DPLOG(ERROR) << "close";
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handle_ = kInvalidHandle;
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return (retval == 0);
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}
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size_t SyncSocket::Send(const void* buffer, size_t length) {
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DCHECK_LE(length, kMaxMessageLength);
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const char* charbuffer = static_cast<const char*>(buffer);
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int len = file_util::WriteFileDescriptor(handle_, charbuffer, length);
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return (len == -1) ? 0 : static_cast<size_t>(len);
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}
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size_t SyncSocket::Receive(void* buffer, size_t length) {
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DCHECK_LE(length, kMaxMessageLength);
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char* charbuffer = static_cast<char*>(buffer);
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if (file_util::ReadFromFD(handle_, charbuffer, length))
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return length;
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return 0;
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}
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size_t SyncSocket::Peek() {
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int number_chars;
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if (-1 == ioctl(handle_, FIONREAD, &number_chars)) {
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// If there is an error in ioctl, signal that the channel would block.
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return 0;
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}
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return (size_t) number_chars;
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}
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CancelableSyncSocket::CancelableSyncSocket() {}
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CancelableSyncSocket::CancelableSyncSocket(Handle handle)
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: SyncSocket(handle) {
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}
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bool CancelableSyncSocket::Shutdown() {
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return HANDLE_EINTR(shutdown(handle(), SHUT_RDWR)) >= 0;
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}
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size_t CancelableSyncSocket::Send(const void* buffer, size_t length) {
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long flags = 0;
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flags = fcntl(handle_, F_GETFL, NULL);
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if (flags != -1 && (flags & O_NONBLOCK) == 0) {
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// Set the socket to non-blocking mode for sending if its original mode
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// is blocking.
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fcntl(handle_, F_SETFL, flags | O_NONBLOCK);
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}
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size_t len = SyncSocket::Send(buffer, length);
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if (flags != -1 && (flags & O_NONBLOCK) == 0) {
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// Restore the original flags.
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fcntl(handle_, F_SETFL, flags);
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}
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return len;
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}
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// static
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bool CancelableSyncSocket::CreatePair(CancelableSyncSocket* socket_a,
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CancelableSyncSocket* socket_b) {
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return SyncSocket::CreatePair(socket_a, socket_b);
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}
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} // namespace base
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