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| 1 // Copyright (c) 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "ppapi/proxy/file_mapping_resource.h" |
| 6 |
| 7 #include <stdio.h> |
| 8 #include <sys/mman.h> |
| 9 #include <unistd.h> |
| 10 |
| 11 #include "ppapi/c/pp_errors.h" |
| 12 |
| 13 namespace ppapi { |
| 14 namespace proxy { |
| 15 |
| 16 namespace { |
| 17 |
| 18 int32_t ErrnoToPPError(int error_code) { |
| 19 switch (error_code) { |
| 20 case EACCES: |
| 21 return PP_ERROR_NOACCESS; |
| 22 case EAGAIN: |
| 23 return PP_ERROR_NOMEMORY; |
| 24 case EINVAL: |
| 25 return PP_ERROR_BADARGUMENT; |
| 26 case ENFILE: |
| 27 case ENOMEM: |
| 28 return PP_ERROR_NOMEMORY; |
| 29 default: |
| 30 return PP_ERROR_FAILED; |
| 31 } |
| 32 } |
| 33 |
| 34 } // namespace |
| 35 |
| 36 // static |
| 37 FileMappingResource::MapResult FileMappingResource::DoMapBlocking( |
| 38 scoped_refptr<FileIOResource::FileHandleHolder> handle, |
| 39 void* address_hint, |
| 40 int64_t length, |
| 41 uint32_t map_protection, |
| 42 uint32_t map_flags, |
| 43 int64_t offset) { |
| 44 int prot_for_mmap = 0; |
| 45 if (map_protection & PP_FILEMAPPROTECTION_READ) |
| 46 prot_for_mmap |= PROT_READ; |
| 47 if (map_protection & PP_FILEMAPPROTECTION_WRITE) |
| 48 prot_for_mmap |= PROT_WRITE; |
| 49 if (prot_for_mmap == 0) |
| 50 prot_for_mmap = PROT_NONE; |
| 51 |
| 52 int flags_for_mmap = 0; |
| 53 if (map_flags & PP_FILEMAPFLAG_SHARED) |
| 54 flags_for_mmap |= MAP_SHARED; |
| 55 if (map_flags & PP_FILEMAPFLAG_PRIVATE) |
| 56 flags_for_mmap |= MAP_PRIVATE; |
| 57 if (map_flags & PP_FILEMAPFLAG_FIXED) |
| 58 flags_for_mmap |= MAP_FIXED; |
| 59 |
| 60 MapResult map_result; |
| 61 map_result.address = |
| 62 mmap(address_hint, |
| 63 static_cast<size_t>(length), |
| 64 prot_for_mmap, |
| 65 flags_for_mmap, |
| 66 handle->raw_handle(), |
| 67 static_cast<off_t>(offset)); |
| 68 if (map_result.address != MAP_FAILED) |
| 69 map_result.result = PP_OK; |
| 70 else |
| 71 map_result.result = ErrnoToPPError(errno); |
| 72 return map_result; |
| 73 } |
| 74 |
| 75 // static |
| 76 int32_t FileMappingResource::DoUnmapBlocking(const void* address, |
| 77 int64_t length) { |
| 78 if (munmap(const_cast<void*>(address), static_cast<size_t>(length))) |
| 79 return ErrnoToPPError(errno); |
| 80 return PP_OK; |
| 81 } |
| 82 |
| 83 // static |
| 84 int64_t FileMappingResource::DoGetMapPageSize() { |
| 85 return getpagesize(); |
| 86 } |
| 87 |
| 88 } // namespace proxy |
| 89 } // namespace ppapi |
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