winsup/cygwin/mmap_helper.h

   1 /* mmap_helper.h
   2
   3    Copyright 2006 Red Hat, Inc.
   4
   5 This file is part of Cygwin.
   6
   7 This software is a copyrighted work licensed under the terms of the
   8 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
   9 details. */
  10
  11 #ifndef _MMAP_HELPER_H
  12 #define _MMAP_HELPER_H
  13 #define _MMIOWRAP(__ptr, __len, __func) \
  14 ({ \
  15   BOOL __res; \
  16   for (int __i = 0; __i < 2; __i++) \
  17     { \
  18       __res = __func; \
  19       if (__res || __i > 0) \
  20         break; \
  21       DWORD __errcode = GetLastError (); \
  22       if (__errcode != ERROR_NOACCESS) \
  23         break; \
  24       switch (mmap_is_attached_or_noreserve (__ptr, __len)) \
  25         { \
  26         case MMAP_NORESERVE_COMMITED: \
  27           continue; \
  28         case MMAP_RAISE_SIGBUS: \
  29           raise(SIGBUS); \
  30         default: \
  31           break; \
  32         } \
  33       break; \
  34     } \
  35   __res; \
  36 })
  37
  38 #define _MMSOCKWRAP(__ptr, __count, __func) \
  39 ({ \
  40   int __res; \
  41   for (int __i = 0; __i < 2; __i++) \
  42     { \
  43       __res = __func; \
  44       if (!__res || __i > 0) \
  45         break; \
  46       DWORD __errcode = WSAGetLastError (); \
  47       if (__errcode != WSAEFAULT) \
  48         break; \
  49       for (unsigned __j = 0; __j < __count; __j++) \
  50         switch (mmap_is_attached_or_noreserve (__ptr[__j].buf, __ptr[__j].len)) \
  51           { \
  52           case MMAP_NORESERVE_COMMITED: \
  53             goto keeptrying; \
  54           case MMAP_RAISE_SIGBUS: \
  55             raise(SIGBUS); \
  56           default: \
  57             break; \
  58           } \
  59       break; \
  60     keeptrying: \
  61       continue; \
  62     } \
  63   __res; \
  64 })
  65
  66 extern inline BOOL
  67 mmReadFile (HANDLE hFile, LPVOID lpBuffer, DWORD nNumberOfBytesToRead,
  68             LPDWORD lpNumberOfBytesRead, LPOVERLAPPED lpOverlapped)
  69 {
  70   return _MMIOWRAP (lpBuffer, nNumberOfBytesToRead,
  71                     (ReadFile (hFile, lpBuffer, nNumberOfBytesToRead,
  72                                lpNumberOfBytesRead, lpOverlapped)));
  73 }
  74
  75 #ifdef _WINSOCK_H
  76 extern inline int
  77 mmWSARecvFrom (SOCKET s, LPWSABUF lpBuffers, DWORD dwBufferCount,
  78             LPDWORD lpNumberOfBytesRecvd, LPDWORD lpFlags,
  79             struct sockaddr* lpFrom,
  80             LPINT lpFromlen, LPWSAOVERLAPPED lpOverlapped,
  81             LPWSAOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine)
  82 {
  83   return _MMSOCKWRAP (lpBuffers, dwBufferCount,
  84                       (mmWSARecvFrom(s, lpBuffers, dwBufferCount,
  85                                      lpNumberOfBytesRecvd, lpFlags, lpFrom,
  86                                      lpFromlen, lpOverlapped,
  87                                      lpCompletionRoutine)));
  88 }
  89 #endif /*_WINSOCK_H*/
  90
  91 #endif /*_MMAP_HELPER_H*/