| 1 | //===-- Linux implementation of sysconf -----------------------------------===// |
|---|---|
| 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/unistd/sysconf.h" |
| 10 | |
| 11 | #include "src/__support/common.h" |
| 12 | |
| 13 | #include "src/errno/libc_errno.h" |
| 14 | #include "src/sys/auxv/getauxval.h" |
| 15 | #include <sys/auxv.h> |
| 16 | #include <unistd.h> |
| 17 | |
| 18 | namespace LIBC_NAMESPACE { |
| 19 | |
| 20 | LLVM_LIBC_FUNCTION(long, sysconf, (int name)) { |
| 21 | long ret = 0; |
| 22 | if (name == _SC_PAGESIZE) |
| 23 | return static_cast<long>(getauxval(AT_PAGESZ)); |
| 24 | |
| 25 | // TODO: Complete the rest of the sysconf options. |
| 26 | if (ret < 0) { |
| 27 | libc_errno = EINVAL; |
| 28 | return -1; |
| 29 | } |
| 30 | return ret; |
| 31 | } |
| 32 | |
| 33 | } // namespace LIBC_NAMESPACE |
| 34 |