1 /*
2 * Copyright (C) 2020 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "src/profiling/symbolizer/scoped_read_mmap.h"
18
19 #if !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
20
21 #include "perfetto/base/logging.h"
22 #include "perfetto/ext/base/file_utils.h"
23
24 #include <sys/mman.h>
25
26 namespace perfetto {
27 namespace profiling {
28
ScopedReadMmap(const char * fname,size_t length)29 ScopedReadMmap::ScopedReadMmap(const char* fname, size_t length)
30 : length_(length), fd_(base::OpenFile(fname, O_RDONLY)) {
31 if (!fd_) {
32 PERFETTO_PLOG("Failed to open %s", fname);
33 return;
34 }
35 ptr_ = mmap(nullptr, length, PROT_READ, MAP_PRIVATE, *fd_, 0);
36 }
37
~ScopedReadMmap()38 ScopedReadMmap::~ScopedReadMmap() {
39 if (ptr_ != MAP_FAILED)
40 munmap(ptr_, length_);
41 }
42
IsValid()43 bool ScopedReadMmap::IsValid() {
44 return ptr_ != MAP_FAILED;
45 }
46
47 } // namespace profiling
48 } // namespace perfetto
49
50 #endif // !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
51