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Side by Side Diff: mojo/edk/embedder/simple_platform_shared_buffer_posix.cc

Issue 728553002: Update mojo sdk to rev afb4440fd5a10cba980878c326180b7ad7960480 (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 6 years, 1 month ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved. 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 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include "mojo/edk/embedder/simple_platform_shared_buffer.h" 5 #include "mojo/edk/embedder/simple_platform_shared_buffer.h"
6 6
7 #include <stdint.h> 7 #include <stdint.h>
8 #include <stdio.h> // For |fileno()|. 8 #include <stdio.h> // For |fileno()|.
9 #include <sys/mman.h> // For |mmap()|/|munmap()|. 9 #include <sys/mman.h> // For |mmap()|/|munmap()|.
10 #include <sys/stat.h> 10 #include <sys/stat.h>
(...skipping 109 matching lines...) Expand 10 before | Expand all | Expand 10 after
120 size_t length) { 120 size_t length) {
121 size_t offset_rounding = offset % base::SysInfo::VMAllocationGranularity(); 121 size_t offset_rounding = offset % base::SysInfo::VMAllocationGranularity();
122 size_t real_offset = offset - offset_rounding; 122 size_t real_offset = offset - offset_rounding;
123 size_t real_length = length + offset_rounding; 123 size_t real_length = length + offset_rounding;
124 124
125 // This should hold (since we checked |num_bytes| versus the maximum value of 125 // This should hold (since we checked |num_bytes| versus the maximum value of
126 // |off_t| on creation, but it never hurts to be paranoid. 126 // |off_t| on creation, but it never hurts to be paranoid.
127 DCHECK_LE(static_cast<uint64_t>(real_offset), 127 DCHECK_LE(static_cast<uint64_t>(real_offset),
128 static_cast<uint64_t>(std::numeric_limits<off_t>::max())); 128 static_cast<uint64_t>(std::numeric_limits<off_t>::max()));
129 129
130 void* real_base = mmap(nullptr, 130 void* real_base =
131 real_length, 131 mmap(nullptr, real_length, PROT_READ | PROT_WRITE, MAP_SHARED,
132 PROT_READ | PROT_WRITE, 132 handle_.get().fd, static_cast<off_t>(real_offset));
133 MAP_SHARED,
134 handle_.get().fd,
135 static_cast<off_t>(real_offset));
136 // |mmap()| should return |MAP_FAILED| (a.k.a. -1) on error. But it shouldn't 133 // |mmap()| should return |MAP_FAILED| (a.k.a. -1) on error. But it shouldn't
137 // return null either. 134 // return null either.
138 if (real_base == MAP_FAILED || !real_base) { 135 if (real_base == MAP_FAILED || !real_base) {
139 PLOG(ERROR) << "mmap"; 136 PLOG(ERROR) << "mmap";
140 return nullptr; 137 return nullptr;
141 } 138 }
142 139
143 void* base = static_cast<char*>(real_base) + offset_rounding; 140 void* base = static_cast<char*>(real_base) + offset_rounding;
144 return make_scoped_ptr(new SimplePlatformSharedBufferMapping( 141 return make_scoped_ptr(new SimplePlatformSharedBufferMapping(
145 base, length, real_base, real_length)); 142 base, length, real_base, real_length));
146 } 143 }
147 144
148 // SimplePlatformSharedBufferMapping ------------------------------------------- 145 // SimplePlatformSharedBufferMapping -------------------------------------------
149 146
150 void SimplePlatformSharedBufferMapping::Unmap() { 147 void SimplePlatformSharedBufferMapping::Unmap() {
151 int result = munmap(real_base_, real_length_); 148 int result = munmap(real_base_, real_length_);
152 PLOG_IF(ERROR, result != 0) << "munmap"; 149 PLOG_IF(ERROR, result != 0) << "munmap";
153 } 150 }
154 151
155 } // namespace embedder 152 } // namespace embedder
156 } // namespace mojo 153 } // namespace mojo
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