roast/source/roast_shared_memory__win32.c

   1 /*      Roast+ License
   2
   3 //      ### C compilable ###
   4 */
   5
   6 #include "roast_common.h"
   7 #include "roast_memory.h"
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <memory.h>
  12 #include <windows.h>
  13
  14 __ROAST_EXTERN_C_START
  15
  16
  17 /*\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡*/
  18
  19 /*\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡\81 \81¡*/
  20
  21
  22 /*      Open/Create Shared Memory.      */
  23 roast_shmem_info* roast_open_shmem( roast_shmem_info *k )
  24 {
  25         DWORD dwProtectMode = 0;
  26         DWORD dwFileMapMode = 0;
  27
  28         /*      roast_shmem_info Initialized Check.     */
  29         if ( k->_zero != 0 ){
  30                 k->error_code = ROAST_SHMEM_INFO_NEED_ZEROCLEAR;
  31                 return NULL;
  32         }
  33
  34         /*      Error Code set to Unknown Error.        */
  35         k->error_code = ROAST_SHMEM_UNKNOWN_ERROR;
  36
  37         /*      AccessMode      */
  38         if ( k->access_mode == ROAST_SHMEM_ACCESS_RO ){
  39                 dwProtectMode = PAGE_READONLY;
  40                 dwFileMapMode = FILE_MAP_READ;
  41         }
  42         else if ( k->access_mode == ROAST_SHMEM_ACCESS_RW ){
  43                 dwProtectMode = PAGE_READWRITE;
  44                 dwFileMapMode = FILE_MAP_WRITE;
  45         }
  46
  47         /*--------------------------------------------*/
  48
  49         /*      CreateFileMapping()     */
  50         if ( k->handle == NULL )
  51         {
  52                 k->handle =
  53                         CreateFileMapping(INVALID_HANDLE_VALUE, NULL, dwProtectMode, 0, k->size, k->str_key);
  54
  55                 if ( k->handle == NULL ){
  56                         k->error_code = ROAST_SHMEM_CREATE_FAILED;
  57                         return NULL;
  58                 }
  59
  60                 /*      This name(Key) was already used.        */
  61                 if ( k->handle == (void*)ERROR_ALREADY_EXISTS )
  62                 {
  63                         k->error_code = ROAST_SHMEM_NAME_ALREADY_USED;
  64                         return NULL;
  65
  66                         /*      ERROR_ALREADY_EXISTS\82Í\81A\83t\83@\83C\83\8b\83}\83b\83s\83\93\83O\88È\8aO\82Å\82»\82Ì\96¼\91O\82ª\8eg\82í\82ê\82Ä\82é\82Æ\82«\81A\82¾\82Á\82Ä\82³\81B
  67                         k->handle = OpenFileMapping(dwFileMapMode, FALSE, k->str_key);
  68
  69                         if ( k->handle == NULL ){
  70                                 k->error_code = ROAST_SHMEM_OPEN_FAILED;
  71                                 return NULL;
  72                         }
  73                         */
  74                 }
  75         }
  76
  77         /*      MapViewOfFile() */
  78         if ( k->buf == NULL )
  79         {
  80                 /*k->buf = MapViewOfFile(k->handle, dwFileMapMode, 0, 0, k->size);*/
  81                 k->buf = MapViewOfFile(k->handle, dwFileMapMode, 0, 0, 0);
  82
  83                 if ( k->buf == NULL ){
  84                         k->error_code = ROAST_SHMEM_MAP_FAILED;
  85                         return NULL;
  86                 }
  87         }
  88
  89         k->error_code = ROAST_SHMEM_NO_ERROR;
  90         return k;
  91 }
  92
  93 roast_shmem_info* roast_create_shmem( roast_shmem_info *k )
  94 {
  95         return roast_open_shmem(k);
  96 }
  97
  98
  99 /*=================================================*/
 100
 101
 102 /*      Close/Delete Shared Memory.     */
 103 roast_shmem_info* roast_close_shmem( roast_shmem_info *k )
 104 {
 105         if ( k->buf ){
 106                 if ( UnmapViewOfFile(k->buf) == FALSE )
 107                 {
 108                         DWORD dwLastError = GetLastError();
 109
 110                         if ( dwLastError == ERROR_INVALID_ADDRESS )
 111                                 k->error_code = ROAST_SHMEM_UNMAP_FAILED_INVALID_ADDRESS;
 112                         else
 113                                 k->error_code = ROAST_SHMEM_UNMAP_FAILED;
 114
 115                         return NULL;
 116                 }
 117                 k->buf = NULL;
 118         }
 119
 120         if ( k->handle ){
 121                 if ( CloseHandle(k->handle) == FALSE ){
 122                         k->error_code = ROAST_SHMEM_CLOSE_FAILED;
 123                         return NULL;
 124                 }
 125                 k->handle = NULL;
 126         }
 127
 128         return k;
 129 }
 130 roast_shmem_info* roast_delete_shmem( roast_shmem_info *k )
 131 {
 132         return roast_close_shmem(k);
 133 }
 134
 135
 136
 137
 138 __ROAST_EXTERN_C_END
 139