libc/src/unistd/linux/sysconf.cpp

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