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// Copyright (c) 2009 The Chromium 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 "base/sync_socket.h"
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include "base/file_util.h"
#include "base/logging.h"
namespace base {
namespace {
// To avoid users sending negative message lengths to Send/Receive
// we clamp message lengths, which are size_t, to no more than INT_MAX.
const size_t kMaxMessageLength = static_cast<size_t>(INT_MAX);
static const SyncSocket::Handle kInvalidHandle = -1;
} // namespace
bool SyncSocket::CreatePair(SyncSocket* pair[2]) {
Handle handles[2] = { kInvalidHandle, kInvalidHandle };
SyncSocket* tmp_sockets[2] = { NULL, NULL };
#if defined(OS_MACOSX)
int nosigpipe = 1;
#endif // defined(OS_MACOSX)
// Create the two SyncSocket objects first to avoid ugly cleanup issues.
tmp_sockets[0] = new SyncSocket(kInvalidHandle);
if (tmp_sockets[0] == NULL) {
goto cleanup;
}
tmp_sockets[1] = new SyncSocket(kInvalidHandle);
if (tmp_sockets[1] == NULL) {
goto cleanup;
}
if (socketpair(AF_UNIX, SOCK_STREAM, 0, handles) != 0) {
goto cleanup;
}
#if defined(OS_MACOSX)
// On OSX an attempt to read or write to a closed socket may generate a
// SIGPIPE rather than returning -1. setsockopt will shut this off.
if (0 != setsockopt(handles[0], SOL_SOCKET, SO_NOSIGPIPE,
&nosigpipe, sizeof nosigpipe) ||
0 != setsockopt(handles[1], SOL_SOCKET, SO_NOSIGPIPE,
&nosigpipe, sizeof nosigpipe)) {
goto cleanup;
}
#endif
// Copy the handles out for successful return.
tmp_sockets[0]->handle_ = handles[0];
pair[0] = tmp_sockets[0];
tmp_sockets[1]->handle_ = handles[1];
pair[1] = tmp_sockets[1];
return true;
cleanup:
if (handles[0] != kInvalidHandle) {
if (HANDLE_EINTR(close(handles[0])) < 0)
PLOG(ERROR) << "close";
}
if (handles[1] != kInvalidHandle) {
if (HANDLE_EINTR(close(handles[1])) < 0)
PLOG(ERROR) << "close";
}
delete tmp_sockets[0];
delete tmp_sockets[1];
return false;
}
bool SyncSocket::Close() {
if (handle_ == kInvalidHandle) {
return false;
}
int retval = HANDLE_EINTR(close(handle_));
if (retval < 0)
PLOG(ERROR) << "close";
handle_ = kInvalidHandle;
return (retval == 0);
}
size_t SyncSocket::Send(const void* buffer, size_t length) {
DCHECK(length <= kMaxMessageLength);
const char* charbuffer = static_cast<const char*>(buffer);
int len = file_util::WriteFileDescriptor(handle_, charbuffer, length);
return static_cast<size_t>(len);
}
size_t SyncSocket::Receive(void* buffer, size_t length) {
DCHECK(length <= kMaxMessageLength);
char* charbuffer = static_cast<char*>(buffer);
if (file_util::ReadFromFD(handle_, charbuffer, length)) {
return length;
} else {
return -1;
}
}
size_t SyncSocket::Peek() {
int number_chars;
if (-1 == ioctl(handle_, FIONREAD, &number_chars)) {
// If there is an error in ioctl, signal that the channel would block.
return 0;
}
return (size_t) number_chars;
}
} // namespace base
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