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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "src/profiling/memory/utils.h"
namespace perfetto {
namespace profiling {
// Behaves as a pread64, emulating it if not already exposed by the standard
// library. Safe to use on 32bit platforms for addresses with the top bit set.
// Clobbers the |fd| seek position if emulating.
ssize_t ReadAtOffsetClobberSeekPos(int fd,
void* buf,
size_t count,
off64_t addr) {
#ifdef __BIONIC__
return pread64(fd, buf, count, addr);
#else
if (lseek64(fd, addr, SEEK_SET) == -1)
return -1;
return read(fd, buf, count);
#endif
}
// Behaves as a pread64, emulating it if not already exposed by the standard
// library.
// Clobbers the |fd| seek position if emulating.
ssize_t WriteAtOffsetClobberSeekPos(int fd,
void* buf,
size_t count,
off64_t addr) {
#ifdef __BIONIC__
return pwrite64(fd, buf, count, addr);
#else
if (lseek64(fd, addr, SEEK_SET) == -1)
return -1;
return write(fd, buf, count);
#endif
}
} // namespace profiling
} // namespace perfetto
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