| 1 | //===---------- Linux implementation of the POSIX madvise function --------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #include "src/sys/mman/madvise.h" |
| 10 | |
| 11 | #include "src/__support/OSUtil/syscall.h" // For internal syscall function. |
| 12 | #include "src/__support/common.h" |
| 13 | |
| 14 | #include "src/__support/libc_errno.h" |
| 15 | #include "src/__support/macros/config.h" |
| 16 | #include <sys/syscall.h> // For syscall numbers. |
| 17 | |
| 18 | namespace LIBC_NAMESPACE_DECL { |
| 19 | |
| 20 | // This function is currently linux only. It has to be refactored suitably if |
| 21 | // madvise is to be supported on non-linux operating systems also. |
| 22 | LLVM_LIBC_FUNCTION(int, madvise, (void *addr, size_t size, int advice)) { |
| 23 | int ret = LIBC_NAMESPACE::syscall_impl<int>( |
| 24 | SYS_madvise, reinterpret_cast<long>(addr), size, advice); |
| 25 | |
| 26 | // A negative return value indicates an error with the magnitude of the |
| 27 | // value being the error code. |
| 28 | if (ret < 0) { |
| 29 | libc_errno = -ret; |
| 30 | return -1; |
| 31 | } |
| 32 | |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | } // namespace LIBC_NAMESPACE_DECL |
| 37 |