Socket subsystem implementation

libraries/nacl-mounts/net/SocketSubSystem.h

+// 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.
+
+#ifndef SOCKET_SUBSYSTEM_H
+#define SOCKET_SUBSYSTEM_H
+
+#include <assert.h>
+#include <errno.h>
+#include <memory.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <map>
+#include <string>
+
+#include "../base/PthreadHelpers.h"
+#include "../net/BaseSocketSubSystem.h"
+#include "../net/IOInterfaces.h"
+#include "ppapi/cpp/file_ref.h"
+#include "ppapi/cpp/file_system.h"
+#include "ppapi/utility/completion_callback_factory.h"
+
+static const unsigned long kFirstAddr = 0x00000000;
+static const int64_t kMicrosecondsPerSecond = 1000 * 1000;
+static const int64_t kNanosecondsPerMicrosecond = 1000;
+
+class SocketSubSystem : public BaseSocketSubSystem {
+ public:
+  explicit SocketSubSystem(pp::Instance* instance);
+  ~SocketSubSystem();
+  pp::Instance* instance() { return pp_instance_; }
+
+  // Syscall implementations
+  int close(FileStream* stream);
+  int read(FileStream* stream, char* buf, size_t count, size_t* nread);
+  int write(FileStream* stream, const char* buf, size_t count, size_t* nwrote);
+  int seek(FileStream* stream, nacl_abi_off_t offset, int whence,
+           nacl_abi_off_t* new_offset);
+  int fstat(FileStream* stream, nacl_abi_stat* out);
+
+  int fcntl(FileStream* stream, int cmd, va_list ap);
+  int ioctl(FileStream* stream, int request, va_list ap);
+
+  unsigned long gethostbyname(const char* name);
+  int connect(FileStream** stream, unsigned long addr, unsigned short port);
+  int shutdown(FileStream* stream, int how);
+  int bind(FileStream** stream, unsigned long addr, unsigned short port);
+  int listen(FileStream* stream, int backlog);
+  FileStream* accept(FileStream* stream, struct sockaddr *addr,
+    socklen_t* addrlen);
+  Cond& cond() { return cond_; }
+  Mutex& mutex() { return mutex_; }
+
+ private:
+  unsigned long first_unused_addr_;
+  pp::Instance* pp_instance_;
+
+  typedef std::map<std::string, unsigned long> HostMap;
+  typedef std::map<unsigned long, std::string> AddressMap;
+
+  Cond cond_;
+  Mutex mutex_;
+
+  // we store a map of virtual addresses here, as PPAPA sockes are name-bound
+  void AddHostAddress(const char* name, unsigned long addr);
+  std::string GetHostByAddr(unsigned long addr);
+
+  HostMap hosts_;
+  AddressMap addrs_;
+
+  DISALLOW_COPY_AND_ASSIGN(SocketSubSystem);
+};
+
+#endif  // SOCKET_SUBSYSTEM_H
+