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//===-- Linux implementation of sysconf -----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/unistd/sysconf.h"
#include "src/__support/common.h"
#include "hdr/unistd_macros.h"
#include "src/__support/OSUtil/linux/auxv.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(long, sysconf, (int name)) {
long ret = 0;
if (name == _SC_PAGESIZE) {
cpp::optional<unsigned long> page_size = auxv::get(AT_PAGESZ);
if (page_size)
return static_cast<long>(*page_size);
ret = -1;
}
// TODO: Complete the rest of the sysconf options.
if (ret < 0) {
libc_errno = EINVAL;
return -1;
}
return ret;
}
} // namespace LIBC_NAMESPACE_DECL
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