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 "src/errno/libc_errno.h"
  14 #include <linux/param.h> // For EXEC_PAGESIZE.
  15 #include <unistd.h>
  16
  17 namespace LIBC_NAMESPACE {
  18
  19 LLVM_LIBC_FUNCTION(long, sysconf, (int name)) {
  20   long ret = 0;
  21   if (name == _SC_PAGESIZE) {
  22     // TODO: get this information from the auxvector.
  23     return EXEC_PAGESIZE;
  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