1 // Copyright 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
ErrnoToPPError(int error_code)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
DoMapBlocking(scoped_refptr<FileIOResource::FileHolder> file_holder,void * address_hint,int64_t length,uint32_t map_protection,uint32_t map_flags,int64_t offset)37 FileMappingResource::MapResult FileMappingResource::DoMapBlocking(
38 scoped_refptr<FileIOResource::FileHolder> file_holder,
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 file_holder->file()->GetPlatformFile(),
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
DoUnmapBlocking(const void * address,int64_t length)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
DoGetMapPageSize()84 int64_t FileMappingResource::DoGetMapPageSize() {
85 return getpagesize();
86 }
87
88 } // namespace proxy
89 } // namespace ppapi
90